Construction and home project calculators

Ten free calculators for the quantities you order before a project: each one shows its formula, a worked example and the sources it relies on. Every result works in US or metric units.

Concrete, gravel and landscaping

Volumes, bags and tons for pours, driveways and garden beds.

Concrete CalculatorCubic yards and bags for slabs, footings, posts and steps.
Cubic Yard CalculatorAny L × W × depth in cubic yards, ft³ and m³.
Gravel CalculatorCubic yards and tons of gravel or crushed stone.
Mulch CalculatorBulk yards or bags of mulch for a bed.

Rooms and renovation

Floor area, paint and stair layout for indoor projects.

Square Footage CalculatorArea of rooms and shapes, added up, in ft², m² and yd².
Paint CalculatorGallons of paint for walls and ceiling.
Stair CalculatorRisers, treads and stringer length with IRC checks.

Roof, cooling and pool

Shingles, air-conditioner size and pool water volume.

Roofing CalculatorRoof area, squares and shingle bundles from pitch.
BTU CalculatorRoom AC size in BTU/h, ENERGY STAR method.
Pool Volume CalculatorGallons and liters in rectangle, round or oval pools.

Want to know how the numbers are checked? Read how we test every formula.