Home calculators
Square footage, concrete, paint, roofing and other project materials, plus running costs.
8 calculators, each with the formula, a worked example and sources.
- BTU Calculator for Room Air ConditionersThe air conditioner size (BTU) for a room, using ENERGY STAR sizing guidance.
- Concrete CalculatorCubic yards and premix bags for a slab, footing or round column.
- Electricity Cost CalculatorWhat an appliance costs to run per day, month and year, and its kWh.
- Gravel CalculatorCubic yards, tons and bags of gravel, stone, sand, topsoil or mulch.
- Paint CalculatorGallons of paint for a room's walls and ceiling, net of doors and windows.
- Roofing CalculatorRoof area, roofing squares and shingle bundles from the footprint and pitch.
- Square Footage CalculatorSquare feet, square yards and square meters for any room or space.
- Tile CalculatorTiles and boxes for a floor or wall, with grout joints and waste.