RedX Construction Calculator

100% free. No ads, no in-app purchases. Feet and inches math with fractions, rafters, stairs and conversions. Built for the jobsite.

The 100% FREE construction calculator. REDX CALC is the feet-inch-fraction calculator for framers, carpenters, contractors and builders: rafter, stair, roof pitch and framing math with no ads, no subscriptions and no in-app purchases.

Work the way you measure: add, cut and convert full feet-inch dimensions with fractions, and switch between imperial and metric in one tap.

FEET & INCHES MATH • Add, subtract, multiply and divide feet-inch measurements with fractions • Adjustable fraction precision • Instant conversion between yards, feet, inches, meters, cm and mm • Percent, square, square root and reciprocal functions • Memory keys and automatic calculation history

RIGHT TRIANGLES & ROOFS • Pitch, Rise, Run and Diagonal keys: enter what you know, tap to solve the rest • Hip/Valley and Jack rafter solvers • Miter angles for trim and framing

STAIRS, ARCS & CIRCLES • Stair layouts: risers, treads, stringers and the stairwell opening • Arc solver for arched openings • Circle facts, columns and cone volumes

DIMENSIONS • Length, Width and Height registers for areas and volumes • Unit-aware math keeps your results in the units you build with

KNOW-HOW BUILT IN • Step-by-step guides for the basics, roofs, stairs, circles, conversions and more • Light and dark mode

100% FREE. FOREVER. No ads. No in-app purchases. No subscriptions. Every feature included.

Part of the RedX Apps family: RedX Decks, RedX Roof, RedX Walls and RedX Stairs.

Terms of Use https://www.redxapps.com/terms-of-service