Best Concrete Calculator Apps (2026): 10 Apps Compared

Running short of concrete halfway through a pour is the kind of mistake you only make once, and a calculator app is a quick way to check your sums on your phone before you order.

Everything below comes from each app's own App Store listing, read as of Nov 2026. The list is alphabetical and in no particular order. Nothing here claims an app's results are accurate, and where a listing gives its own disclaimer, I've passed it on.

Concrete calculators at a glance

Tool	Type	Good for
Concrete and Agg Calculator (Chaney Enterprises)	Concrete, aggregate and masonry calculators	An exact amount and an order amount
Concrete Calc Pro (Calculated Industries)	Volume, rebar and stair calculator	Weight, truckloads and bags
Concrete Calculator - Calc (Phan Nhat Dang)	Volume calculator for slabs, walls and stairs	Saved projects and shareable summaries
Concrete Calculator - Slab (Mikhail Nikitin)	Set of construction material calculators	Bags, truck loads, gravel and asphalt
Concrete Calculator All In One (Binary and Bricks)	Concrete app for engineers and site teams	Many shapes, regional codes and offline use
Concrete Calculator Plus (Inch Calculator)	Set of concrete and masonry estimators	Slabs, footings, walls and steps
Concrete Calculator Pro (Vaghani Keyur)	Slab and footing estimator	Mix ratios and bag counts
Concrete Calculator Tools (Peth)	Feet-and-inch slab calculator	A free rectangular slab calculator
Ozinga Concrete Calculator (Ozinga)	Calculator tied to a ready-mix service	Sharing the estimate with a supplier
Sakrete (Oldcastle)	Augmented reality bag estimator	Drawing the pour on screen

Ten apps that work out how much concrete you need

Concrete and Agg Calculator (Chaney Enterprises)

Best for: Getting an exact amount and a recommended order amount for slabs, footings, walls, steps, curbs and columns, plus sand, gravel, stone and block.

Concrete Calc Pro (Calculated Industries)

Best for: Calculating volume in cubic yards, feet or meters for slabs, footings, columns and walls, plus weight, truckloads, bag needs, rebar and stair layouts.

Concrete Calculator - Calc (Phan Nhat Dang)

Best for: Saving volume calculations for slabs, walls, footings, columns, stairs and curbs into projects, in metric or imperial units, with waste estimates.

Concrete Calculator - Slab (Mikhail Nikitin)

Best for: Turning measurements into cubic yards or meters, bag counts and truck loads, with an adjustable waste factor, offline use and gravel, asphalt and rebar calculators.

Concrete Calculator All In One (Binary and Bricks)

Best for: Breaking results into cement bags, sand, coarse aggregate, admixture and water, across the 85 shapes and six regional design codes its listing names.

Concrete Calculator Plus (Inch Calculator)

Best for: Estimating concrete in cubic yards or bags for slabs, footings, columns, poured walls, block walls and steps, plus blocks, mortar, rebar and gravel.

Concrete Calculator Pro (Vaghani Keyur)

Best for: Checking slab and footing volumes, adjusting mix ratios and counting the bags you need by bag size, then saving and sharing the results.

Concrete Calculator Tools (Peth)

Best for: Entering slab sizes in feet and inches or metric for a quick volume, with circular slabs, columns and post holes in its upgrade.

Ozinga Concrete Calculator (Ozinga)

Best for: Working out concrete for flatwork, footings, walls, columns and caissons, then sharing the estimate with your local supplier or contractor.

Sakrete (Oldcastle)

Best for: Drawing a slab with augmented reality to get an estimated number of bags and a recommended concrete type, or estimating from posts, post size and hole depth.

Calculator suites, an AR estimator and two supplier apps

Read the ten listings together and three kinds of app turn up. Calculator suites cover lots of shapes in one place. Concrete Calculator Plus lets you 'Estimate concrete needed for a rectangular slab, circular slab, footing, circular columns or posts, poured walls, block walls, and steps', and Concrete Calculator All In One says it covers '85 concrete shapes, six regional design codes', from columns and footings to staircases and culverts.

Sakrete works differently. Its listing says you can 'Draw and visualize concrete pours using Augmented Reality for an estimated number of bags', and it suggests a concrete type too. The app is listed under the developer Oldcastle.

Ozinga's app is tied to a ready-mix concrete service. It lets you share your estimate with 'your local concrete supplier or contractor', and if you're inside the Ozinga ready mix service area, it lets you 'chat live with Ozinga customer service representatives'. That's the split a searcher wouldn't guess: two of these apps carry a materials brand, Sakrete and Ozinga, while the other eight are listed under other developers.

Cubic yards, cubic metres or bags

Check the units before you start. Concrete Calculator - Slab says 'Get volume in cubic yards or meters, bag counts, truck loads', and Concrete Calc Pro offers to 'Determine weight, truckloads, and bag requirements' and calculates volume in cubic yards, cubic feet and cubic meters. Concrete Calculator Plus gives results in cubic yards or bags, and Concrete Calculator Tools takes feet and inches or metric and returns cubic metres, cubic feet or cubic yards.

Concrete Calculator All In One goes further, with its own keypad that takes 'ft, in, yd, m, cm and mm', and results that switch between cubic metres, cubic feet and brass. Some split the answer by bag size: Concrete Calculator - Slab lists bag counts for four bag sizes, and Concrete Calculator Pro counts bags by the size you pick.

The exact amount versus the amount to order

One listing makes a point the others leave to you. Concrete and Agg Calculator says each calculator gives 'an exact amount and a recommended order amount' to allow for things like forms bending and over excavation. Two others deal with waste: Concrete Calculator - Calc lists waste estimates, and Concrete Calculator - Slab has an adjustable waste factor.

And one listing is plain about the limits. Concrete Calculator - Calc says 'Results are estimates only and should not be used as the sole basis for purchasing materials or making construction decisions', and suggests checking measurements, calculations and quantities with a qualified professional. That's worth keeping in mind whichever app you use.

Measuring up before you open the app

• Stick to one unit. Measure in feet and inches or in metric, then check the app is set to the same.
• Know your shape. Slabs, footings, columns, walls and steps each have their own calculator in several of these apps, so measure what the form needs.
• Count the posts. For fence or deck posts, Sakrete estimates from the number of posts, the post size and the hole depth, and Concrete Calculator Tools has a post hole calculator in its upgrade.
• Allow for waste. Use the app's waste or order setting if it has one.
• Check the bag size. If you're buying bags, make sure the app is counting the bag size you'll buy.
• Share the numbers. Ozinga and Concrete Calculator Pro both let you share results with a supplier or contractor.

Do you make a concrete calculator app? Tool makers can ask to be considered for a featured place on this list.

My advice before you order concrete

Use an app to check your sums, not to replace your own thinking. Measure twice, run the numbers in one app, and if the job's big, run them in a second one. If your app gives an exact amount and an order amount, look at both, and if it doesn't, allow something for waste. For anything structural, the disclaimer one maker gives is the right instinct: check it with a qualified professional.

If the slab is the start of a bigger job, my guide to the best estimate software for contractors covers quoting the whole thing, and for what goes on top of the slab, my guide to the best flooring for your home is a good next read.

Want your tool on this list? Featured spots and reviews here are paid partnerships. Here's how to partner with me.

Frequently asked questions

How do I work out how much concrete I need?

For a slab, multiply length by width by depth to get the volume, then convert it to cubic yards, cubic metres or bags. A concrete calculator app does that for you and handles other shapes such as footings, columns and steps.

Can a concrete calculator app tell me how many bags to buy?

Several can. Some count bags for the bag size you choose, and one uses augmented reality to estimate the number of bags for a pour you draw on screen.

Do concrete calculators allow for waste?

Some do. One gives a recommended order amount alongside the exact amount, one has an adjustable waste factor, and another lists waste estimates. Check the setting before you order.

Can I rely on a concrete calculator app's results?

Treat them as estimates. One app's own disclaimer says results are estimates only and shouldn't be the sole basis for buying materials or making construction decisions, and it suggests checking with a qualified professional.

Can I use a concrete calculator in metric?

Yes. Several apps here take metric or imperial measurements and give results in cubic metres as well as cubic yards.

Do concrete calculator apps work offline?

Some say so. Two listings here say they work offline, which helps on a site with poor signal.