Concrete Calculator

Concrete Calculator is the fast on-site tool for UK tradespeople, builders, and DIYers. Enter your dimensions and get instant volume in cubic metres plus exact 25 kg cement bag counts, sand, and aggregate quantities — ready for the merchants. Stop guessing how much concrete you need. Stop running back to the van for a calculator. Stop ordering 30% over and tipping the rest down the side of the drive. WHAT YOU GET • Volume calculation in m³ for slabs, columns, and circular pours • UK mix ratio presets: C20 (1:2:4), C25 (1:2:3), C30 (2:3:6) • 25 kg cement bag count rounded up • Sand and aggregate quantities in tonnes • Configurable waste percentage (defaults to 10%) • Industry-standard 1.54 dry-volume bulking factor built in • Ready-mix delivery cost option (£ per m³) • Share results to text, WhatsApp, email — perfect for quotes • Works offline. No registration. No nonsense. ACCURATE TO INDUSTRY STANDARDS Material quantities use the 1.54 dry-volume bulking factor recognised by UK builders' merchants and concrete suppliers. The same maths your supplier uses, in your pocket. WHO IT'S FOR • Bricklayers and groundworkers laying foundations • DIY landscapers pouring shed bases and patio sub-bases • Builders pricing slabs, columns, and post foundations • Anyone tired of overpaying because they can't do mental maths in the rain CALCULATIONS COVERED • Slab and base — length × width × depth • Column — square or rectangular pour • Circular — diameter × depth (πr²d) UK-SPECIFIC Built in the UK for UK sites. Metric throughout. Mix ratios match what you'll find at Travis Perkins, Jewson, and your local merchant. DISCLAIMER All calculations are estimates only. Always confirm quantities with your supplier before ordering. The developer accepts no responsibility for over- or under-ordered materials. Free to use, ad-supported. Optional one-time in-app purchase removes ads forever.