DIY Project Calc — Free Home Project Calculators

Free calculators for your important home projects

Select a calculator below to get started — no signup required.

Generator Size Calculator

Find the right generator wattage to keep your essential appliances running.

Find the right shed size based on what you need to store.

Calculate cubic yards or bags of concrete for slabs, columns, and tubes.

Estimate posts, panels, and material cost ranges for your fence.

Estimate preliminary BTU and tonnage range for home heating and cooling.

Estimate decking boards, joists, posts, and material cost for your deck.

Estimate how many gallons of paint you need for any room.

Calculate roof squares, shingle bundles, and underlayment for your roof.