15 free tools · US & metric units
Free Home Improvement & Construction Calculators
Calculate material quantities, project measurements, and estimated costs with easy-to-use calculators for your next home improvement project.
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Popular calculators
The tools people reach for most.
Concrete Calculator
Volume for slabs, footings, columns and post holes in yd³ and m³.
Open calculatorSquare Footage Calculator
Add up rooms in feet and inches or metres. Totals in sq ft and m².
Open calculatorGravel Calculator
Volume and estimated weight of stone for driveways and paths.
Open calculatorMulch Calculator
Cubic yards or bags of mulch for one or several garden beds.
Open calculatorPaint Calculator
Gallons or litres of paint for a room, with doors and windows removed.
Open calculatorTile Calculator
Tiles and boxes for floors or walls, including cuts and waste.
Open calculator
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How it works
- 1
Enter your measurements
Type lengths, widths and depths as you measured them, in feet and inches or metres and millimetres.
- 2
Choose units and materials
Pick a unit for each field, a material or bag size, and adjust waste and coverage to match your products.
- 3
Get quantities and costs
See the volume, area or item count to buy, with a breakdown you can copy or print for your supplier.
Every result shows the formula and assumptions behind it. Estimates are only as good as the measurements entered, so check product labels for coverage and yield, and confirm structural details with a qualified professional.
Helpful guides
All guidesGuide · 7 min read
How to Calculate Concrete Volume
Formulas for slabs, footings and columns, unit conversions and how much extra to order.
Read guideGuide · 6 min read
How Much Mulch Do You Need?
Choosing a depth, measuring odd-shaped beds and deciding between bags and bulk.
Read guideGuide · 6 min read
How to Calculate Square Footage
Rectangles, L-shapes, triangles and circles, plus feet-and-inches conversions.
Read guide
US and metric, side by side
Switch between US customary and metric units in the header, or choose units field by field. Results show cubic yards and cubic metres, gallons and litres, US tons and tonnes, so the numbers work whether you buy in the US, the UK, Canada or Australia.
Free, private and fast
All calculations run in your browser. There is no sign-up, and the measurements you enter are not sent to our server. Learn more about the site.