Simple calculators that help you buy the right amount of material.
My Project Calculator is a growing collection of free calculators for home and construction projects. Each one is built around a single question, like how many bags of concrete a fence needs or how much gravel a French drain takes.
Each calculator uses standard volume and area formulas, which are explained on its page. Material yields and weights are typical values, so check the label or your supplier for the exact figure. Everything runs in your browser, and nothing you enter is sent to or stored on our servers.
These are planning estimates. Site conditions, material brands, and local building codes vary, so confirm quantities with your supplier, and consult a qualified professional for structural or safety-critical work.
Have a project you'd like a calculator for? Get in touch.