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Concrete volume, cement bags, sand, gravel & rebar for slabs, footings & more
Concrete Calculator helps you work out exactly how much concrete, cement, sand, gravel and rebar you need, so you order the right amount the first time. It's built for builders, contractors and DIY home projects. Enter the dimensions, tap Calculate and get the concrete volume in cubic meters or cubic yards, plus a 5% and 10% reserve for waste and spillage. 10 CONSTRUCTION TYPES - Slab: floor slab or patio, with window and door openings subtracted - Column: square or rectangular concrete column - Round column: sonotube or round pier - Strip footing: strip foundation for walls and fences - Screed: floor screed or leveling layer - Stairs: concrete steps with the waist slab included - House apron: the concrete strip around the house - Path: sidewalk, walkway or driveway - Curb: curb or edging - Excavation and trench: soil volume to dig out Each type comes with a clear diagram, and the letters on the drawing match the input fields, so you always know what to measure. MATERIALS: CEMENT, SAND, GRAVEL, WATER - Concrete grades M100 to M400 (B7.5 to B30, C8/10 to C25/30) - Number of cement bags: 25, 40, 50 kg or 47, 80, 94 lb - Sand, gravel and water quantities - Choose a 0%, 5% or 10% reserve REBAR CALCULATOR - Slab, path and apron: rebar mesh with your choice of spacing, bar diameter and 1 or 2 layers - Strip footing: longitudinal bars plus stirrups - Total rebar length and weight, with 5% for laps and 5 cm concrete cover included METRIC AND IMPERIAL UNITS - Every field can be entered in m, cm or mm, or in ft and in - Results in m³, yd³ and ft³, with weights in kg or lb PROJECTS AND HISTORY - Combine a whole house in one project, for example footing + slab + columns + stairs - See the total concrete, materials and rebar for the whole project - Every calculation is saved to history; tap one to open it again SHARE AND EXPORT - Copy the result or share it to WhatsApp, Telegram, email and other apps - Export a clean PDF report for your client, foreman or concrete supplier MORE FEATURES - Light and dark theme - 48 languages - Works offline, with no sign-up needed - Fast, lightweight and simple Plan your foundation, pour a patio, build steps or order ready-mix concrete without guesswork. Download Concrete Calculator and get accurate quantities in seconds. Note: material quantities are approximate guidelines. Always check them against your local building codes and your supplier's mix design.