ShopMath: Project Calculator

Buy it once. Own it forever. ShopMath is a fast, beautiful feet-inch-fraction calculator with five essential trade solvers — fully offline, with no ads, no account, and no subscription. Ever.

Most calculators fight you with decimals. ShopMath speaks the language of the shop and the jobsite: feet, inches, and fractions, added and multiplied exactly, then shown to the precision you choose (1/8 down to 1/64). When rounding loses precision, it tells you with a clear "˜" — no silent lies.

WHAT'S INSIDE • Fraction Calculator — add, subtract, multiply, and divide feet-inch-fractions with a running tape, memory, and instant metric conversion. • Stairs — risers, riser height, treads, total run, and stringer length, with editable code-reference values for Canada (NBC) and the US (IRC). • Roof Pitch — convert freely between pitch, angle, and rise/run, and get the common rafter length. • Board Feet — thickness × width × length, with quantity, optional cost, and cubic-metre output. • Concrete — slab, footing, and round column volumes with a waste factor and bag counts that always round up. • Unit Converter — length, area, volume, and weight, imperial to metric, exact.

BUILT RIGHT • 100% offline. No network calls, anywhere. • No account, no ads, no subscription, no in-app purchases. • Privacy: Data Not Collected. ShopMath sends us nothing. • Dark mode, Dynamic Type, and high-contrast throughout.

Reference values are provided for convenience and are not building-code advice. Verify all results against local codes and manufacturer specifications.