Most home projects use more than one material, which means more than one calculation. This hub organizes our calculators by project, so you can work through a job in order: measure first, then quantities, then cost. Every calculator shows its formula and a worked example, and our How We Calculate page explains the methods and assumptions behind all of them.
Tile a bathroom floor
Start with the Tile Calculator for tile and box counts, then measure the room with the Square Footage Calculator if the layout has alcoves or an L-shape.
Paint a bedroom
The Paint Calculator works out gallons for walls and ceiling, including primer and second coats, so one trip to the store covers the whole room.
Pour a small concrete slab
Use the Concrete Calculator to get cubic yards and bag counts for the slab, and the Gravel Calculator if you are laying a gravel base underneath it.
Refresh garden beds
The Mulch Calculator converts bed area and depth into cubic yards or bags, and the Gravel Calculator does the same for stone edging and paths.
Lay new flooring
Measure with the Square Footage Calculator, then use the Flooring Calculator for box counts with the right waste allowance for laminate, vinyl plank, or hardwood.
Resurface a deck
The Deck Board Calculator counts the boards needed to cover your deck surface, based on its dimensions and the board width you choose.
Drywall a room
Count sheets with the Drywall Calculator, then finish the walls using the Paint Calculator or the Wallpaper Calculator.
Not sure where to start?
Begin with a measurement. The Square Footage Calculator gives you the area figure that almost every other calculator on this site builds on, and the full list of tools is on the Calculators hub.