Construction Calculator

Construction Calculator — estimate materials in seconds

Stop guessing how much material to order. Construction Calculator gives you fast, accurate quantity estimates for the five most common building and renovation jobs: area, concrete, tile, flooring, and brick. Enter your measurements, get the numbers you need to order — with a waste allowance built in.

Works in both metric and imperial units. No ads. No tracking. No account. No internet required.

Five calculators, one clean tool

Area — calculate the area of rectangles, triangles, and circles. Add multiple shapes for walls, floors, or ceilings, and subtract openings like doors and windows.

Concrete & Mortar — work out the volume of a slab and estimate how many bags of concrete you need, with support for common bag sizes.

Tile — find out exactly how many tiles and boxes you need for any surface, with an adjustable waste allowance for cuts and breakage.

Flooring & Laminate — calculate the area and number of boxes for laminate or flooring, with a waste percentage suited to plank layout.

Brick & Blocks — estimate the number of bricks or blocks for a wall, including the mortar joint and a waste allowance.

Metric and imperial — switch anytime

Toggle between metric (meters, m², m³) and imperial (feet, inches, yd³) with one tap. Concrete volume is shown in cubic yards for imperial, the way it's actually ordered in the US. Whether you work in meters or feet-and-inches, the app speaks your units.

Built for accuracy

Every calculation includes a waste allowance you control — because ordering exactly the surface area always leaves you short. Tile and brick counts always round up to whole units. The bracket of results shows you the area, the quantity, and the number of boxes, so you can take the numbers straight to the supplier.

Designed to be fast

No clutter, no sign-up, no setup. Open the app, pick a calculator, enter your measurements, read the result. Inputs update the result live as you type. The whole point is to get you a number and get out of your way.

Private by design

Construction Calculator collects no data. It requires no permissions, makes no network connections, and contains no advertising or analytics. Everything happens on your device. You can use it on a job site with no signal, in airplane mode, anywhere.

Read the full privacy policy at the link on this page.

Who it's for

Builders and contractors estimating materials for a job

Renovators and DIY homeowners planning a project

Tilers, bricklayers, and flooring installers

Anyone who needs to order the right amount of material the first time

What's not included (yet)

This is a focused tool that does five things well. It does not currently include paint, roofing, drywall, stairs, or rebar calculators, cost estimation, or saved projects. These may come in future updates. For complex structural work, always confirm with a qualified professional.

Note on estimates: all results are estimates to help you plan and order materials. Bag yields and material coverage vary by manufacturer and conditions. Always verify against your specific products and add a margin for safety.

Always free to calculate

The five core calculators are free. We may add optional Pro features in a future update (one-time purchase, never a subscription) such as additional calculators or saved projects — but the core material estimating will stay free.

We're an independent project and read every email. Suggestions and corrections welcome at alexander.chelpanov@proton.me.