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How to calculate concrete blocks needed

Local Foundation Contractors - Foundation Cost Estimate

A concrete block calculator really helps when doing an estimate or a proposal for a concrete masonry wall. The calculator will figure the amount of block and related materials fast and quite accurate. Use this concrete calculator to estimate the amount of concrete blocks needed to complete a project Usually, standard rectangular size is used in the construction of buildings. It is also referred as concrete masonry unit. Select the block size and enter the length and width in this concrete block calculator to calculate the requirement of the total number of concrete blocks

Concrete Mix Design - Stonemont Solution

  1. Concrete Mixes Enter the size of the slab you want to build in square feet. The calculator will indicate the number of 60 lb bags you will need to build a 4 inch or 6 inch slab. (all yields are approximate and do not allow for uneven substrate, waste, etc.) Enter Number of Square Feet Desired
  2. Use the slab calculator to figure the concrete needed for the porch surface. Use the footing calculator to calculate the sides of the porch and the steps; Here is an example: This porch has 9 sq. feet of porch surface, so enter in the slab calculator 4 thickness by 3' width by 3' length. This totals .11 cubic yards
  3. To estimate how many blocks you'll need per row, divide the total length of the wall by the length of the block. To figure out how many rows you'll need, divide the ideal wall height by the height of the block. Make sure to account for the first row being half-buried
  4. Calculate volumes for concrete slabs, walls, footers, columns, steps, curbs and gutters. Enter dimensions in US units (inches or feet) or metric units (centimeters or meters) of your concrete structure to get the cubic yards value of the amount of concrete you will need to make this structure
  5. Calculate the number of blocks required by substituting the area to be built and the size of the block in this equation: total area of walls / area of a block = number of blocks required. To conclude the example, building 2,100 square feet of wall from .89-square-foot blocks requires 2,360 blocks — 2,100 x 0.89 = 2,359.55

Concrete Block Calculator - Find How Many Blocks You Nee

Retaining Wall Calculator and Price Estimator - Find How

For example, if your standard concrete block is 1 foot by 0.5 feet and is separated from its neighbours by a half-inch of mortar, then each block accounts for 1.0417 x 0.5417, or 0.5643 square feet. Step 5 Divide the total surface area of the wall by the surface area of the representative block to get the total number of blocks in the wall Then you need to calculate your concrete block costs; just multiply the number of cinder blocks by the price per single block: concrete block costs = price per block * number of blocks. When it comes to estimating the mortar needed, a good rule of thumb is that three standard bags will typically cover 100 blocks. To calculate the number of such. Divide The Total Surface Area Of The Wall By Surface Area Of One Block: ∴ Number of blocks = Surface Area of wall/Surface Area of a block = 91/1.0625 = 86 Consider 5% wastage of concrete blocks. So the total numbers of blocks required = 86 + (86 x 5/100) = 86 + 4 = 90 How to Calculate Quantity of Concrete blocksIn This channel you can learn about Civil Engineering Update Videos which are using generally in civil Engineeri..

Brick & Block Calculator Use our handy calculator to help you estimate how many bricks or concrete blocks you'll need for your project. Please get in touch with your local branch if you have any questions. Oxford 01865 326500, Swindon 01793 484455 or Yarnton 01865 84257 This estimate would be based on the fact that a lot of my readers have been asking questions on how they can calculate the number of blocks required to build a 3 bedroom flat. In order to calculate the number of blocks required , there is need to to have a plan at hand First, you'll need to multiply the total wall area by 1.125: 700 square feet X 1.125 = 788 concrete blocks. So, now you know that you need 788 concrete blocks to build the garage that you planned. However, every time that you order concrete blocks, you need to know that you should order more 5% Maximizer Concrete Mix. Masonry Work. Calculated results will reflect how many bags are needed for Block and Brick. Enter the number of bricks (8 x 2 x 4) or blocks (8 x 8 x16) in the box below that you plan to use for your project. The calculator will then tell you the number of bags you need based on the different size of bags we carry The Blocks Needed for a Foundation calculator computes the number of blocks needed for the walls of a foundation. Masonry Foundation. INSTRUCTIONS: Choose units and enter the following: (L) Length of the foundation.(W) Width of the foundation.(H) Height of the foundation(BS) Block Size used in the foundation (Choose One)Blocks Needed (nB): The calculator returns the total number of blocks.

Concrete Calculator for Android - APK Download

Step 2. Calculate the number of courses in your foundation. A course of standard concrete block, including the mortar joints, is eight inches high. Divide the height of the foundation (in inches) by eight to figure out how many courses you need. Advertisement Concrete block calculator. Use our calculator to estimate how much you need. Simply enter in the dimensions of the wall you need to build and hit calculate. You can then enter your details to get a quotation by email - or if you are in a real hurry just give us a call and order over the phone. Sales: 028 2583 1245 Brick Calculator - How Many Bricks Do You Need? Our free brick calculator helps you work out how many bricks you need. Minimise waste and build in a more efficient way. Perfect for projects such as extensions, exterior walls and more

Concrete Block Calculator & Estimator - CEMEX US

Calculate The Volume Of A Concrete Block With Mortar Allowance: Let the block is 16″ x 8″ x 8″ and mortar allowance is 1″ ∴ Volume of one block with mortar = (16+1) x (8+1) x 8 = 1224 inch3 [The mortal will be given on the upper side and one side of every concrete block] = 1224/12x12x12 = 0.70 cu.ft. Step 6 Concrete blocks can be solid or hollow with two or three cores or voids. Concert blocks are lightweight generally concrete blocks are light and common in various sizes a standard concert block is 600mm x 250mm x 150mm is equivalent to by about 8 red concrete-block, the weight of one single block is about 14kg where is 8 red concrete-block is.

Precast concrete - this is a term that refers to prefabricated concrete blocks. The blocks can be in different sizes and shapes. How Much Concrete Do You Need? The first step is usually to determine an estimate of the concrete volume needed. To do that, the calculator will need the length, width, and height; that is, simply the volume or the. The best way to calculate how much concrete you're going to need in cubic yards is to do the following: Mark the area that will need concrete and divide it into smaller areas. Calculate the volume of the area after determining the shape of the area (see the chart below) by multiplying in the thickness of the concrete The simplest way to calculate the numbers of blocks you need for your fence project, assuming you are fencing a land measuring 100 feet by 60 ft, you can know the total volume of concrete to be used, then using your mix ratio, you can extract the value for sand, concrete and cement. Delete. Replies. Reply

How to Calculate Concrete Needed To Pour a Slab | Poured

Block Size: 48 long, 16 high and 11 1/4 wide. 1 yard of concrete fills 10.5 straight forms 1 yard fills 13.5 corner forms How to find the number of forms needed: 1) Multiply the height of the wall (in feet), by the length of the wall (in feet). 2) Subtract the area, in sq. ft, of all window and door openings Hi all Anyone have the formula to estimate the amount of concrete needed to fill a 8″ block wall. I have heard that 1 yd for every 100 sq ft for 12 block so I can ball park it but it would be nice to be sure

CONCRETE BLOCK CALCULATOR [How to Calculate Concrete

  1. g we need 2 m 3 of concrete for M20 Concrete Mix, (Mix Ratio, M20 = 1 : 1.5 : 3) Total Part of the Concrete = 1+1.5+3 = 5.5 Parts. Therefore, Cement Quantity = (Cement Part / Concrete Parts ) * Concrete Volum
  2. d. Avoid the hassle and compute the needed materials in a matter of seconds with a concrete block calculator
  3. Block Fill Calculator. NOTE: This Calculator should be used as an estimating tool ONLY. Chaney Enterprises is not responsible for any discrepancies in material based on calculations made with this application. To order concrete, call 301-932-5000 and press option 1
  4. Estimate the concrete volume required by the following: Divide total square footage of wall to be formed, including corners, by 53 or 40 (for 6 or 8 forms, respectively). This equals the number of cubic yards of concrete required. Add 1.5 additional yardage for waste and the pump. (You do not want to be short on concrete
  5. If thrust blocks are not provided, the pipe would be free to move causing joint separation, leakage, and damage to other connected structures or pipes. INFORMATION regarding the use of thrust blocks includes the following: Normally plain unreinforced CONCRETE is used to construct blocks. Reinforcement may be used as needed

20x2x1 = 40. Now divide by 27: 40/27 = 1.48 cubic yards of concrete. For pouring concrete footings 20 feet long, 2 feet wide, and 1 foot long, you would need 1.48 yards of concrete. When talking about concrete, people usually drop the cubic and just say yards, so do not be confused if the person who takes your order when you are ordering. Estimate the number of solid concrete blocks required for your construction. Also know how much quantity of cement and sand are required by providing the width and height of your wall Use this calculator to calculate the amount of concrete block needed to construct a masonry wall. To calculate the quantity of brick or block you need to know what size block or brick you want - the unit dimensions that matter to your quantity is length and height - width won't change the quantity, only the width of the wall you are building Multiply the Linear foot by the factor to determine how many cubic yards of concrete you will need for your footing. CONCRETE FOR FOOTING. Quantity Of Standard Block Needed For Specified SQ / FT. Determine the Number of Courses Calculate the block needed for a wall that is 50' long, 10' high, with 80 square feet of openings. 50' 50' x 10.

May 21, 2017 - Calculate how many concrete blocks you need for a wall or foundation, and learn how to estimate concrete block and mortar for a project. Pinterest. Today. Explore. When autocomplete results are available use up and down arrows to review and enter to select. Touch device users, explore by touch or with swipe gestures 1 cubic yard = 27 cubic feet. With this formula in mind, you'll be able to calculate just how much concrete or cement you'll need for your project: One 60-lb bag of concrete gives you .45 cubic feet of concrete when mixed with 2.5 quarts of water. In order to have enough concrete for one cubic foot, you'll require 2.2 bags of 60-lb concrete Step 2: Calculate the volume of the 35 blocks. If the volume of 1 block is 0.0143, the volume of 35 blocks = (0.0143 × 35) = 0.502 m 3. Step 3: Calculate the volume sand required for the 35 blocks. The volume of 1 bag of cement is 34.72 litres = 0.03472m 3. This is obtained by knowing that the mass of 1 bag of cement = 50kg, and the density. Divide the total cubic feet needed by the total cubic feet that can be made from one bag of Quikrete Concrete Mix. How many bags of concrete do I need for a 10×20 slab? A 60-pound bag yields. 017 cubic yards, and an 80-pound bag yields. 022 cubic yards The volume of mortar required = 0.03 x 150 = 4.5 m 3. Typical mix ratio for mortar (laying of blocks) is 1:6. Cement requirement. Quantity of cement required = 1/7 x 1440 kg/m 3 = 205.71 kg. Making allowance for shrinkage between fresh and wet concrete = 1.54 x 205.71 = 316.79 kg. Quantity of cement required in bags = 316.79/50 = 6.33 bags

Cement is the main building material needed to mould the blocks, and therefore the need to calculate how many bags would be needed for the entire work - the types of blocks to be used at the different levels of the building process -6-inches size blocks specifically for the foundation, and the normal 5-inches for the building itself. Block height. mm. Result. Area covered: Number of blocks: Please note: We have included an allowance for a 10mm mortar joint, and an allowance of 10% extra blocks to allow for breakages and cuts. The number of blocks required has been rounded up. Important: The results of this estimator tool are for guidance only

Concrete Block Calculator - How to Calculate the Concrete

How do I calculate cubic meters of concrete? 1 cubic meter (1m3) can be visualised by drawing a cube 1 meter wide x 1 meter tall x 1 meter depth. To calculate the concrete volume of a concrete slab you multiply the length, width and depth of the concrete slab to get an estimate of the amount of concrete you need in cubic metres m3 Our concrete calculator provides you an easy way to calculate concrete volume and estimated cost of concrete slabs, footers, walls, columns, steps, stairs, curbs and gutters in cubic feet, cubic yards, and cubic meters and inches. It makes your construction project planning and budgeting more accurate You'll Learn How to calculate quantity of concrete blocks in Wall in URDU/HINDI.There are several methods for calculating number of blocks in a wall. In this..

How Much Does It Cost to Build a Retaining Wall in 2019

Our professional customer service representatives and our Concrete Store Representatives can help you make sure you are prepared, just call 229-888-9199. Concrete Washout - You will need to provide a washout area for the truck after it is finished pouring the concrete The concrete blocks that are used to build block foundations are hollow. After the concrete blocks are laid, the voids can be filled with a cement-based mortar or poured concrete that contains small pea gravel. If the builder does this, the filled concrete block walls become nearly identical to poured concrete walls Step 6. Position the concrete blocks in the circle, using the trammel as a guide. Check each one as you go by rotating your trammel. The end of the stick should come very close, approximately 1/8 inch from each block, without touching the blocks Once, the quantities are determined, it is easy to estimate the cost of a concrete block, driveway, patio, yard or any other structure with the price prevailing in your area. To find the amount of ready mix concrete for a slab, you can estimate it with a standard volume calculator. Select dimensions of the concrete structure e.g., beam, column.

How to calculate the aerocrete for building manually. In order to approximately calculate required quantity of concrete blocks, just need a good contact with the calculator and know the basic mathematical formulas. There are two different ways of computing, one is based on the knowledge of the area of the walls, and the second volume. Condition Equal Spacing adjusts all spaces to fit total length and width evenly, at nearest under or equal to entered spacing. Equal Spacing. With exact spacing, the middle spaces may be adjusted smaller. Spacing Scale. Concrete rebar calculator plan view diagram. Round Measurements To. 1/32 1/16 1/8 1/4 1/2 Calculate. This is how much concrete you will need for your project. 8 m 3. This is how many truck loads. you may need. 1. Calculate again. Contact us to discuss more about your project. Call 09 486 3333

This free concrete calculator estimates the amount of concrete necessary for a project, and can account for different shapes and amounts of concrete. Explore other calculators related to housing or building, as well as hundreds of other calculators addressing finance, math, fitness, health, and more Use the Readymix Concrete Volume Calculator to calculate the volume of concrete you require for your job. If you are not sure of how to calculate the volume of different shapes, you can use the Common Shape Calculator which will provide you with the appropriate equations. *1m³ minimum order value. 1. Calculate your volume. 2. Choose your project Quantity Calculator. Planning a project can be difficult to plan and budget for. Whether you are looking for paving, concrete, blocks, masonry, render or screen products, use our quantity calculator to find out how much product you need to order to complete your project. Paving Concrete Blocks For concrete blocks measuring 450 x 215 x 100mm the calculations simple. For every m2 of wall you will need ten concrete blocks. For every ten blocks you will need two 25kg bags of bricklaying mortar. Square Metres Number of blocks Bags of 25kg mortar 1 10 2 2 20 4 3 30 6 4 40 8 5 50 10 6 60 12 7 70 14 8 80 1

Our concrete calculator allows you to accurately work out the amount of concrete you'll need for your project. Simply add the measurements for your concrete order to the relevant shapes above (you only have to fill in the shape/s you want to use) You can build up a concrete calculation for complicated areas by adding additional shapes of each type Calculate the amount of Rebar needed for reinforcing a wall. This calculator assumes that you are using 20 foot long lengths of Rebar. If your wall is over 20 feet long it will add the amount of overlap required. If your wall is over 40 feet long it will add 2x the amount of overlap required. For each additional 20 foot increase of the wall. This calculator can be used for free standing hollow concrete stairs that require one or two of the sides to be made of solid concrete in addition to an upper landing. Concrete Calculator for Stairs. To calculate the amount of concrete needed with this calculator for stairs, you need to know the rise, run, throat depth, and the width of the stairs Concrete Calculator Keohane Readymix concrete is supplied in cubic metres, from a minimum of 1 cubic metre upwards in 0.5 cubic metre quantities. Once you have your measurements use our Concrete Calculator below to work out how much you need. Select the basic shape of your space - rectangle, circle or triangle, then insert you

Concrete Block Calculator - Easily calculate concrete

Determine How Many Cubic Yards of Mortar is Needed. Multiply the area of the wall by 0.02 -- the industry standard factor for calculating mortar volumes for block walls -- if the wall is. This series of concrete calculators has been developed to help you plan your project. You can calculate how much concrete, cement, sand, mortar or render you will need. For each calculation you will have to know the dimensions of your object. The calculator will perform the sums for you - where relevant it will add a small percentage for the wastage that inevitably happens when mixing & using. Deck Blocks. You can achieve similar results by using precast concrete deck blocks or piers instead of pouring concrete yourself. Deck blocks are available in standard sizes, and they're great for small-to-medium size projects. They usually have a concrete lug on top, so that you can attach wooden deck beams later hi my question is if there is a formula or parameter to calculate the numbers of concrete blocks 12x20x40 centimeters in a wall or house as a whole. thanks for your help! Hi, sorry for writing an old thread, but I have the same issue ATM and hope will help somebody

Remix Concrete | Ready Mix Concrete Delivered To Your Door

Block Calculator Concrete Block Calculato

A 80lb bag of mortar yields 12 blocks, so divide the total number of blocks by 12 to calculate the number of bags needed such as 135 ÷12 = 11 bags, thus you will need 11bags of 80lb or 15bags of 60lb premixed mortar for your 120 sq ft of block wall 8 Calculator will calculate the approximate quantity of 8 inch concrete blocks in a standard building. Enter wall height in courses, number of bond beams, number of starter bars (cores filled), steel door frames (standard 6'8 X 2'8 - no lintel) and number of wall ends. Wall ends are the ends of walls that stand alone

Slabs. Enter the depth, width and length of your concrete slab to calculate the number of cubic yards and concrete bags needed to complete your project The calculator will estimate the volume of concrete or aggregate needed for your project. You can calculate how much concrete you need for your construction project using this calculator that works in both US Customary Units (feet and inches) and International System of Units or metric units (meters and centimeters) of measurement How does this concrete calculator work? This is a house tool that can help you estimate the cement requirements for your construction project. It uses a premixed cement density of 133 pounds per cubic foot (60 pounds/0.45 cubic feet, or 80 pounds/0.60 cubic feet) or 2,130kg/cubic meters to obtain the weight in the result Another way you can calculate the amount of concrete you need is to use this formula: L x W x H /27 -- This formula will figure cubic yardage for a slab or floor. Here's an example: Let's calculate the concrete for a 20 foot x 20 foot x 6 inch thick concrete slab. 1. 20 x 20 = 400. 2. 400 x .5 = 200 ( The thickness or Height of the slab is 6. Concrete Cost Estimator helps homeowners and contractors calculate the amount of pre-mixed concrete needed for footings, slabs and walls, round columns, as well as concrete stairs. Enter the dimensions of your project, and you will get results in cubic yards, as well as the number of concrete mix bags needed for the job

Fox Blocks Estimator Pro allows you to enter your construction specifications for a Fox Blocks project to determine an accurate material and labor estimate for any size project. Below is the basic outline of the newest version of the Estimator Pro with multiple tabs for Fox Blocks materials, accessories, rebar, concrete, man hours, pricing. To board this concrete lintel planks and 2 by 3 wood will also be needed so that it can carry the wet concrete mix that will be poured on it to form the lintel. -Using the plan above as a sample to calculate the quantity of material needed for our concrete lintel Portland cement is not the product to choose for laying concrete or cinder block. Mortar is basically cement with additives to to make it more adhesive and plastic and is the product designed for laying brick or block. Mortar, when mixed in a 3 to.. Thus, the quantity of cement required for 1 cubic meter of concrete = 0.98/0.1345 = 7.29 bags of cement. The quantities of materials for 1 m3 of concrete production can be calculated as follows: The weight of cement required = 7.29 x 50 = 364.5 kg. Weight of fine aggregate (sand) = 1.5 x 364.5 = 546.75 kg

Hollow Blocks - Making home ownership affordable in Kenya

Concrete Calculator - How Much Do I Need? QUIKRETE

Use our free online Premix Concrete Calculator to calculate exactly how many premix concrete bags you should buy for your concrete project. Just enter in the desired height, width, and thickness of your concrete project and then press the calculate button. The free concrete calculator will tell you exactly how many 40 lb, 60 lb, or 80 lb bags. 6. Convert the volume into cubic yards or cubic meters as needed. The slab's volume above is expressed as 39.6 cubic feet, but, unfortunately, concrete is usually measured in cubic yards. There are 27 cubic feet in a cubic yard, so, to convert to cubic yards, we can divide by our cubic feet value by 27 Concrete Footing Calculator. To use the Concrete Volume Calculator, simply enter the width, length, and thickness of your pour. The calculator will automatically estimate the number of cubic yards of concrete that will be required. Concrete is ordered by volume in cubic yards To determine the cost to pour concrete slab, use the following tips: Amount. Calculate the volume of concrete you need in cubic yards. The formula for cubic yards is this: Multiply the length (10 ft.) by the width (10 ft.) by the depth (.35 ft., or 4 in.) and divide it by 27 (the number of cubic feet in a cubic yard) Estimation of number blocks The simplest approach is to estimate the number of blocks required in a metre square of wall. The planar dimensions of a standard block in Nigeria is (450mm × 225mm). Therefore the planar area of 1 block = (0.225 × 0.45) = 0.10125 m 2. Therefore one metre square of wall will contain; 1/0.10125 = 9.87

Now calculate for doors,Numbers of blocks for a door of 900mm is 18. height of a door (2100/225=9)+width of a door (900mm/450mm=2). so 9 x2 =18 blocks for each door. Multiply 18 by numbers of doors=18 x8=144 blocks. Add 144+161=305 blocks,then remove from total blocks of 644 (for dpc) + 1932. Total numbers of blocks reqd=2,271 blocks Concrete Calculator is a quick and easy way to calculate the volume, weight, and number of bags of concrete you need per project. Perfect for slabs, walls, columns, tubes, curbs, and stairs just to name a few. We love to stir-fry and mix things up here with all sorts of internet businesses. Contact us

Concrete block 440x290x100mm - Robinson Quarry Masters Limited

For example, let's calculate how much concrete is needed for a 5-inch thick rectangular driveway, 60-feet long (length) and 18-feet wide (width). The area of the driveway is 1,080 square feet (60-feet x 18-feet). According to the table above, one cubic yard of concrete placed at a thickness of 5-inches covers 65 square feet This DIY Concrete Guide will show you how to order concrete and calculate your concrete order. The simple way is to call Carroll's Building Materials and give us your measurements Length, (Width and desired Depth of the Slab). Another way to calculate the amount is to multiply the length of the slab by the Width of the slab then divide by the. Concrete Calculator - Figure out how much concrete you'll need for your footings. You can look up the recommended footing size, based on the size and type of house and the bearing capacity of the soil. As you can see, heavy houses on weak soil need footings 2 feet wide or more

Our free Concrete Calculator makes it easy to find out how many yards of concrete you need. Simply enter in the desired width, length, and concrete thickness. Press calculate and you have the answer! Learning how to calculate the amount of concrete needed is easy when using our concrete formula and online concrete calculator How to estimate concrete hollow blocks or CHB A wall has a dimension of 35 meters long and and 7 meters high specify the use of 15 cm. concrete hollow blocks. Prepare a comparative bill of materials for CHB. 15 x 20 x 40 cm. CHB wall find the area of the wall A= 35 x 7 A= 275 sq. m. you need to find the area of your wall, 35X7=245sq.m

Concrete Calculator - How Much Concrete Do I Need? - The

The major materials needed in the preparation of concrete blocks are portland cement, sand, aggregate (stone), and water. You can calculate the concrete mix ratio by entering the width, height and depth of the ratio in this concrete mix ratio calculator to know the total volume, sharp sand, gravel and water Hollow concrete block masonry reduces the cost of construction labour and construction materials because the use of a larger size of concrete block reduces the number of joints in work. 03. Semi-skilled or unskilled labour can also work in this type of construction. 04. These concrete blocks need low maintenance and are durable. 05

Calculation of volume of concrete for beams:-. Beams are generally in a rectangular shape, to calculate the volume of concrete required for beams calculate the top or bottom surface area of the beam and multiply with the depth of beams. Volume of concrete for rectangular beam = Surface area x Depth = length x width x depth = 4×0.5×0.4=0.8m 3 Commonly, concrete slabs are between 4 and 20 inches thick and are used for a purpose of floor and ceiling construction. Thinner slabs can be used for exterior paving. Before any pour you need to know how much concrete will be needed. Please use the calculator below to give you some estimate of the concrete amount. Length: feet 1. Lay out your blocks in the bed size of your choice. 2. If your bed is in the middle of your lawn, like mine, we need some sort of grass removal system. Instead of removing the sod with chemicals or back breaking labor, we're going to smother it. Some people use a couple layers of newspaper, but I prefer cardboard Calculate the Concrete You Need. Cut a piece of wire mesh the size of the hole, and set it aside. You can expect the column footing to require at least one whole bag of concrete, probably more, but the formula for a more precise calculation is L x W x H / 12, with the result being the number of bags you need, rounded up Thanks for asking this very important question. In life, many things are minor but have great impact in future. Cover blocks is one of the very minor but important item in civil engineering concrete work of slabs, columns, beams etc. There is no r.. Two Concrete Calculator are provided for different concrete mixes: General mix - 1:5 cement:all-in ballast or 1:2½:3½ cement:sharp sand:gravel. and. Paving mix - 1:3½ cement:all-in ballast or 1:1½:2½ cement:sharp sand:gravel. Comment: If you are wondering how 1:2½:3½ equals 1:5 (shouldn't it be 1:6 I hear someone say), the answer is.