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Concrete Calculator: How Much Concrete Do I Need?

A concrete calculator is a free app I use to figure out how much concrete a job actually needs before I order anything. It takes the guesswork out of projects like slabs, footings, walls, columns, and stairs, so I’m not overbuying or coming up short.

You just enter the size of the area, and it gives you a solid estimate in cubic yards. It is especially helpful for DIY projects and small jobs where you want quick numbers without doing the math by hand. Whether you are pouring a driveway, patio, foundation, or steps, it helps you plan better and avoid wasting money.

How much concrete do i need?

how much concrete do i need?

Figuring Out Volume for Project

Anytime I start a concrete project, the first thing I figure out is the volume. Most people think in cubic yards because that’s how ready-mix trucks deliver concrete. If you are using bags instead, that works too. you can still get an accurate number either way.

Let’s walk through a simple example.

Say you are pouring a basic patio. A 4-inch thickness is usually enough for regular foot traffic. If the slab is going to handle vehicles or heavier loads, it’s better to go with 5 or even 6 inches. I always add about 10% extra to the total to cover spills, uneven digging, or small mistakes. It’s a lot better to have a little left over than to run short in the middle of a pour.

Concrete Calculator App For iPhone

The concrete calculator is also available on the App Store. Before getting started, you will need to download it. It is completely free to use. There are no subscriptions or hidden charges. Just download it and start using it right away.

concrete calculator app for iphone

Concrete Slab Calculator Home Depot - PDF Report

Now you can generate PDF reports for all calculated estimates. This is one of the key features that sets this app apart from others. You can save your calculation history and share all past estimates as a PDF report.

Concrete Calculator App For Android

The concrete calculator app is also available for Android. You can download it from the Google Play Store, and it is completely free to use. There is no subscription and no signup required. Once it is installed, you can start calculating concrete for slabs, footings, walls, columns, and stairs right away. It is a handy tool to have on your phone when you are planning a pour or standing on the job site.

concrete calculator app for android

App Features

With this app, you can easily estimate how much concrete you need for different types of construction projects:

Concrete Calculator App Free Download

If you are tired of guessing how much concrete you will need and want to avoid running short or overpaying for extras, there's a handy app that makes estimating super easy. It lets you calculate exactly what your project requires, with a bit of buffer built in so you don't have to stress about shortages or waste.

This app is available on both the Google Play Store and the App Store. You can download it using the links below:

concrete calculator app for android concrete calculator app for iphone
  

Frequently Asked Questions

1. What is the 10/20/30/40 rule when making concrete?
It is a volume mix: 10% cement, 20% water/air, 30% sand, 40% gravel for basic strength.
 
2. How do you calculate how much concrete you need?
Length x width x thickness (in feet) / 27 = yards.
 
3. How much does it cost to have a 20x20 concrete slab poured?
About 2.96 yards at 4 inches, so $325-535 material, plus labor.
 
4. How many yards of concrete for a 30x30 slab 4 inches thick?
11 yards.
 
5. Do you need rebar for a 4-inch slab?
Not always for light use, but yes for driveways.