Home Calculators

Plan your next project with free calculators that run entirely in your browser. Nothing you type is ever sent to a server.

Paint Calculator

Work out how many gallons or liters of paint you need for a room.

Calculate how much flooring material and how many boxes to buy.

Find out how many rolls of wallpaper a room needs, waste included.

Quickly calculate a room's floor area and perimeter.

Estimate what it costs to run an appliance per day, month, and year.

Get a BTU sizing estimate for a room air conditioner.

Calculate concrete volume and bags needed for a slab or footing.

Work out how many tiles and boxes you need for a floor or wall.