If you're planning to build anything with concrete β like a floor, path, or foundation β the first step is to know how much concrete you need. Guessing can cost you time and money. Buying too much is a waste. Buying too little can stop your project halfway. Thatβs why we created this Concrete Calculator β a free and easy tool to help you get it right.
A Concrete Calculator is an online tool that tells you how much concrete you need for your project. You just enter your measurements β like the length, width, and thickness β and the calculator does the math for you.
It also shows you how much cement, sand, and gravel (also called aggregate) youβll need, using a basic mix ratio like 1:2:4.
Planning matters. If you donβt know how much concrete your project needs, you might:
Our calculator saves time and stress. It helps you get an accurate estimate in seconds.
Suppose you're building a concrete slab that is:
Volume = Length Γ Width Γ Thickness
20 Γ 15 Γ 0.5 = 150 cubic feet
That means youβll need 150 cubic feet of concrete. Now, letβs break it down using the 1:2:4 mix ratio:
Are you a student or someone new to construction? This calculator is a great way to learn how to estimate materials. It shows how volume, units, and mix ratios work together β all in a practical, hands-on way.
Building with concrete starts with smart planning. With this Concrete Calculator, you can figure out exactly what you need β fast and easy. Whether you're doing a big project or a small DIY job, using this tool can help you save money, reduce waste, and get the job done right the first time.
Donβt leave things to chance. Use this calculator every time you build β and build with confidence!
Yes! For circles, just use the area formula (Ο Γ radiusΒ²), then multiply by the thickness. For odd shapes, break them into rectangles or circles and add the volumes.
You can use feet, meters, inches, or centimeters. Just make sure to use the same unit for all your inputs.
No. The calculator gives the exact number. We recommend adding 5β10% extra to your order just to be safe.
We use the 1:2:4 ratio β 1 part cement, 2 parts sand, and 4 parts gravel. Itβs great for most general uses.
Each bag of cement usually equals about 1 cubic foot. Divide the total cement volume by 1 to get the number of bags. Example: 21 cubic feet = 21 bags (roughly).
Yes! This concrete calculator is 100% free. No login, no payment, no hassle.
Absolutely. The tool works perfectly on mobile devices, tablets, and desktops.