Mix – Concrete Calculator

Northbound Apps

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About this app

Calculate concrete mix ratios, bag counts, and volume for any shape — fast
and free. No subscription, no account required. Mix is a concrete calculator
for contractors, construction professionals, and DIYers who need quick,
accurate estimates on the job site.

WHAT IT CALCULATES

Mix handles five shape types on one screen: rectangular slab, round slab,
footing, column, and steps. Enter dimensions and results appear instantly.
Whether you're pouring a driveway pad, a round column base, a foundation
footing, or a concrete staircase, it's all in one place.

Steps calculations are a genuine gap in free concrete calculator apps — most
stop at slabs and footings. Mix includes them, so you can estimate a
staircase pour like anything else.

CONCRETE MIX CALCULATOR

Mix is a full concrete mix design calculator, not just a volume tool. Select
a mix grade from M10 to M50, or enter a custom mix ratio for your specific
job. For each grade, you get the complete material breakdown: cement, sand,
gravel (aggregate), and water — calculated for the exact volume you're
pouring.

Bag counts are shown for all four standard sizes at once: 40 lb, 50 lb,
60 lb, and 80 lb. Set a price per bag and Mix adds an estimated cost column
to the same table. A cement calculator shouldn't need three taps to show a
bag count.

HOW TO USE IT

Select a shape. Enter your dimensions — a labeled diagram shows which
measurement goes where, so there's no guessing which field is "length" vs.
"depth." Choose a mix grade or type in a custom ratio. Set your waste factor
(default 10%) and an optional price per bag. Read your results: volume, bags
needed for every standard bag size, and a full material breakdown for cement,
sand, aggregate, and water.

Results update as you type. Save any calculation to your history and reload
it from the saved calculations sheet.

UNITS

Mix works in both imperial and metric. Imperial outputs concrete volume in
cubic yards and cubic feet — the units your concrete supplier uses in the US.
Metric outputs cubic meters and uses kg bag sizes. Switch between them with a
single tap at the top of the screen.

Searching for a concrete calculator in feet? This is it. Need a cement
calculator in cubic meters? Same app, one tap.

WHY THIS APP

Most free concrete calculator and cement calculator apps haven't been updated
in years — small input fields, no shape diagrams, no mix design integration.
Mix is built with Material 3: large, readable fields that hold up in direct
sunlight on a job site, bold result numbers, and a layout that doesn't
require reading a manual.

The leading free concrete calculator gives you volume and bag count — and
stops there. Mix adds mix ratios, material quantities, steps, and labeled
diagrams in one screen, with no subscription and no account required.

USE CASES

Mix is the concrete calculator for:

Driveways — enter slab length, width, and thickness for instant volume and
bag count.

Patio and sidewalk pads — same inputs, same instant results.

Deck footings and fence post holes — use the round column shape. Enter
diameter and depth for concrete volume and bag count.

Foundation footings — the footing shape covers wide, shallow pours with
accurate concrete volume and full material breakdown.

Retaining wall sections — use the wall shape for vertical and horizontal
concrete pours.

Concrete steps and stairs — a dedicated shape, not a workaround using the
slab calculator. Enter the number of steps, rise, run, and width for total
pour volume including waste factor.

Contractors use Mix before ordering to avoid over-buying or running short.
DIYers use it to build confidence before a weekend home improvement project.
Both get the same fast, accurate concrete mix calculator — bag counts,
material quantities, and volume in one screen.

COMMON QUESTIONS

How many bags for a 10x10 slab? A 4-in slab at M20 needs ~37 bags of 80 lb. Enter 10×10×4 in and read the result.

Calculating steps? Select Steps, enter count, rise, run, width.

What’s new

Initial release.