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Planning to build something with concrete? Whether it's a small patio or a big foundation, you’ll need the right amount of concrete to do the job well. Too little, and you’ll run out midway. Too much, and you waste money. That’s where a Concrete Calculator comes in. It helps you quickly figure out how much concrete you need — without doing any hard math.
A concrete calculator is an easy tool anyone can use. You just enter a few numbers — like how long, wide, and thick your slab or structure will be — and it tells you how much concrete you need.
Before using the calculator, you’ll need to measure the area you want to fill with concrete. Here's what to measure:
Let’s say you want to build a small concrete slab. It’s 10 feet long, 5 feet wide, and 0.5 feet thick. The formula is simple:
Volume = Length × Width × Thickness
10 × 5 × 0.5 = 25 cubic feet
That means you’ll need 25 cubic feet of concrete for your project.
Concrete is made from four basic ingredients: cement, sand, gravel (also called aggregate), and water. The most common mix ratio is 1:2:4. That means:
Our calculator takes your volume and breaks it down based on this mix ratio. It also gives you an idea of how much water you’ll need to make a strong, smooth concrete mix.
Measuring correctly is super important. If you get the numbers wrong, you could end up:
Tips for good measurements:
This tool works for all kinds of concrete projects, such as:
Yes! Just divide the area into smaller square or triangle shapes. Calculate each part separately, then add the numbers together.
The calculator accepts feet, meters, inches, and centimeters. Just make sure you use the same unit for all inputs.
No. It gives you the exact volume. We recommend adding 5-10% extra to be safe.
For general projects, the 1:2:4 ratio (cement:sand:gravel) works well. But for heavy-duty or structural work, check with a builder or engineer for a stronger mix.
Each 94-pound bag of cement equals about 1 cubic foot. But this depends on the mix ratio and project. Our calculator can help break it down based on the total volume.
Estimating your concrete needs might seem tricky, but it doesn't have to be. With this easy-to-use calculator, you can quickly get accurate numbers, save money, and avoid stress during your project.
Whether you're fixing your driveway, building a new patio, or pouring a foundation — this tool is your best friend. Always measure twice, plan ahead, and keep a little extra on hand.
Bookmark this Concrete Calculator and use it every time you start a new project. It’s fast, free, and makes building easier for everyone — from first-timers to pros.