About HandyCalc

HandyCalc is a free collection of calculators for everyday practical questions: how much concrete to order for a shed base, how many tiles a bathroom needs, how much gravel covers a driveway, or when a dog's puppies are due.

How we build our calculators

Every tool shows the formula and assumptions behind its result — densities, coverage rates, waste allowances and standard product sizes — so you can check the numbers yourself. All calculators work in both imperial (feet, inches, pounds) and metric (metres, centimetres, kilograms) units.

Estimates, not guarantees

Results are estimates intended to help you plan and budget. Product sizes and yields vary between brands, so confirm quantities with your supplier or builder before ordering. Pet calculators are for information only and are not a substitute for advice from a veterinarian.

Keeping it free

HandyCalc is supported by advertising. We never ask you to sign up. Questions or suggestions for a new calculator? Get in touch.