Stair and rafter PDF plans, generated offline, on your phone. Feet-inch-fraction math, board feet, deck and concrete estimates: every jobsite calculation in one toolbox. Built for contractors, carpenters, and builders who need accurate answers in the units they actually use. STAIR CALCULATOR β’ Enter total rise and get a complete stair layout β’ Live, zoomable diagrams: elevation, stringer, detail, and balusters β’ Unit rise, unit run, number of treads and risers β’ Export a detailed PDF with cut dimensions for the shop RAFTER CALCULATOR β’ Common rafters from span or run β’ Ridge height, birdsmouth, and tail cuts β’ HAP, overhang, and slope calculations β’ PDF export with all the cut angles you need HIP & VALLEY RAFTERS β’ Hip and valley rafter lengths and angles β’ Backing angles and cheek cuts β’ King common and jack rafter spacing β’ Full PDF export for the crew OFFLINE PDF PLANS β’ Shop-ready stair plans with every cut dimension β’ Rafter plans with lengths, angles, and layout marks β’ Print from the truck or share straight to the crew β’ No signal, no cell service, no account required FEET-INCH-FRACTION MATH β’ Enter measurements naturally: 3' 5-3/16" + 2' 10-1/2" β’ Add, subtract, multiply, and divide all in fractions β’ Choose your precision: 1/2" through 1/64" β’ Results displayed in feet-inches-fractions or inches-fractions RIGHT ANGLE CALCULATOR β’ Solve any right triangle from two known sides β’ Enter in feet-inches-fractions, get results the same way β’ Find the diagonal, rise, or run instantly β’ Perfect for squaring walls, checking layouts, and cutting braces BUILT FOR THE JOBSITE β’ Every calculator one tap away in the CutOnce Toolbox β’ Free 7-day trial of every advanced calculator. Basic calculator always free. β’ One-time purchase to unlock. No subscriptions. No ads. β’ Free updates included β’ Works on iPad and iPhone β’ English and Spanish language included Whether you're framing walls, cutting stringers, laying out rafters, or squaring foundations, CutOnce gives you accurate answers in the units you actually use.