Construction Calculator is the math tool built for the job site. Type measurements exactly as you read them off a tape measure in feet, inches, and fractions. No unit conversion needed. Get answers in feet-inches-fractions, decimal feet, decimal inches, and metric. Includes a stair calculator that computes risers, treads, and stringer length per IRC code. Rafter calculator handles length, ridge height, and birdsmouth cuts. Plus 200+ free online calculators covering concrete, roofing, lumber, framing, fencing, flooring, and unit conversions. Available as a free iOS app with 4.7 stars and 479 reviews, and as free web calculators at getconstructioncalculator.com/calculators/.