Construction Calculator - Calx

About

Built for the job site: Construction Calculator A1 turns the math you do every day — concrete orders, rebar takeoffs, feet-inch measurements — into a few taps. FEET-INCH & FRACTION MATH • Add, multiply and divide in feet, inches and fractions down to 1/16" • Unit-aware: 3 ft × 4 ft = 12 ft², mixing metric and imperial freely • L / W / H memory keys, cost math with %, history and one-tap copy CONCRETE • Mix designer for M10–M50 grades: cement bags, sand, aggregate and water • 6 pour geometries — slabs, columns, footings or direct volume • Dry-volume factor and total weight built in STEEL & REBAR • Slab, column, beam and footing reinforcement with CAD-style section details • Bar weight, spiral/helix rebar, BBS shape codes (BS 8666:2020) • Honest estimating notes — check final quantities against your bar schedule AREA · VOLUME · CONVERT • 19 area shapes and 17 volume shapes with clear diagrams • Surface area and material-to-weight conversion • 40+ unit converter categories with favorites and copyable results PROJECTS • Save any result to a project with inputs and date • Length, area, volume and cost totals per project • Share a text summary in one tap Metric and imperial everywhere. No account needed. Works offline. Whether you're a contractor, estimator, civil engineer, mason, carpenter or a weekend builder — if your tape measure sees daily use, this calculator belongs next to it. Terms of Use: https://karakuserdi.github.io/terms.github.io/ Privacy Policy: https://karakuserdi.github.io/privacypolicy.github.io/