Handy and random calculators for useful things
Concrete Calculator
Created by Dan Franks
Last Updated: 21st August 2025
A tool to calculate concrete volume and cost for your project
Building a patio? Laying a slab? Filling in your enemies’ moat? Whatever your project, this calculator will tell you how much concrete you need and how much lighter your bank balance is about to become.
How to use the concrete calculator
This calculator works out how much concrete you’ll need based on your slab or footing dimensions. It also gives you a cost estimate, whether you’re buying in bulk or mixing bags yourself.
Enter your dimensions
Measure the length, width, and depth of the area you’re concreting – all in metres. The calculator handles the volume maths. You just need a tape measure and possibly a second pair of hands.
Depth
This one catches everyone out. Convert from mm to m:
- 100mm = 0.1m
- 150mm = 0.15m
- You get the idea
If your ground’s uneven or your mixing technique is ‘generous’, leave the wastage set to 10%.
Concrete costs
You’ve got two ways to cost it:
Option 1. Delivered concrete
Enter your cost per cubic metre. This suits big jobs, or if a drum of wet cement showing up on your street feels exciting.
Option 2. Bagged concrete
Enter the bag size in kg and the price per bag. This is for when you’re doing it yourself, or your wheelbarrow’s feeling underemployed.
The calculation
The calculator works out the base volume in cubic metres, adds your wastage percentage, and then:
- Estimates the cost for delivered concrete based on m³ price
- Estimates number of bags needed based on standard density (2400kg/m³)
- Calculates total bag cost
It’s all mixed in for you
You’ll see total volume, bag quantities, and costs update as you change inputs. Switch between delivery and DIY mode to see what suits your project (and your patience).
No signup, no fluff, just quick concrete maths.
Quick and easy
Concrete Volume and Cost Calculator
Works out concrete volume and cost from your dimensions. Converts depth to cubic metres, adds wastage, and shows you the numbers for both bulk delivery and bagged mix. Enter length, width, depth, and your preferred cost method – the calculator does the rest.
Options
Dimensions
Enter the dimensions of your slab or footing in metres.
Concrete Details
Add the cost of your materials. Fill in either the cost per m³ or the cost per bag to get a calculation.
Enter your dimensions and concrete details above to get a calculation.
Why use our concrete calculator?
Because guessing with concrete usually means one of two things: running out halfway through a pour or paying for a truckload you didn’t need. This calculator takes away the uncertainty. Enter your dimensions and costs, and it tells you exactly how much concrete your project will eat up and how much it will cost.
It works for both delivered concrete and bagged mix, so you can compare options instantly and decide whether bulk delivery or a DIY mix makes more sense for your job. You’ll see total volume, bag counts, wastage, and costs update as you tweak the numbers, saving you the hassle of juggling tape measures, density conversions, and mental arithmetic.
The benefit is simple: no guesswork, no hidden steps, and no nasty surprises when the lorry turns up or the last bag runs out. Just quick, clear concrete maths that helps you get the job done right first time.
Our guarantees to you!
Based on the latest data
Updated regularly using trusted UK sources.
Always free to use
Open access for everyone with no sign-up or hidden costs.
Easy to use
Clear inputs, instant results, no confusion.
Your privacy is protected
We don’t collect or store any personal information.
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Use our calculators anywhere
Our calculators are fully responsive, adjusting to any screen size. Whether you’re on your phone, tablet, or laptop, you can easily access and use them wherever you are.
The layout is designed to be simple and user-friendly, ensuring you get accurate results quickly, no matter the device.