Free Calculators, Built for UK Tradespeople

Every calculator on TradeCalculator uses metric measurements as standard, works with UK product sizes available from major builders' merchants, and factors in UK Building Regulations where applicable. Whether you're calculating plasterboard for a dot-and-dab job, working out cable sizes to BS 7671, or estimating roof tiles for a standard UK pitch, our tools give you answers that make sense for the way you actually work.

No converting from imperial. No guessing whether a product size exists at your local merchant. No wondering whether the regulations referenced are American or Australian. Everything here is designed for UK tradespeople, full stop.

All calculators on TradeCalculator are 100% free to use. There are no premium tiers, no signup walls, no email gates, and no limits on how many calculations you can run. Open the page, punch in your numbers, and get your answer. That's it.

We believe that practical tools for working tradespeople should be accessible to everyone. Whether you're a sole trader pricing up your next job on the drive to site, or a homeowner planning a weekend project, the tools work the same for everyone.

We know most tradespeople aren't sat at a desk when they need a quick calculation. That's why TradeCalculator is designed mobile-first — every calculator works perfectly on your phone, with large input fields, clear results, and fast load times. Use it on site, in the van, or at the merchants. It just works.

TradeCalculator spans 31 trade categories with calculators covering everything from plastering and plumbing to roofing, electrics, and drainage. Each calculator includes practical waste allowances, material breakdowns, and where relevant, guidance notes referencing current UK building regulations and best practices.

Our calculators are designed to give you sensible, real-world results. We include standard waste allowances where appropriate (typically 5-10% depending on the material and application), use product dimensions that match what you'll actually find on the shelves, and round up to whole units where you can't buy half a sheet or half a bag. The goal is always to give you a number you can take straight to the merchants or put into a quote.