Stair Calculator

Number of risers and tread run from total rise and target riser height.

Stair Calculator helps you number of risers and tread run from total rise and target riser height. Enter total rise, target riser, and tread depth, review the breakdown, and use the guidance below to understand what the number means — and what it does not. What the Stair calculator does Stair Calculator is built for materials, areas, volumes, and jobsite estimates. Number of risers and tread run from total rise and target riser height. You enter total rise, target riser, and tread depth, then Simple Calculators computes the result instantly. Formulas match common contractor and DIY references for rectangular and simple shapes. How the math works Pick Units, then enter the Total rise (floor to floor height), your Target riser (the height of each step) and the Tread depth (the part you step on). Risers = total rise ÷ target riser, rounded to a whole number; the actual riser = total rise ÷ risers, so every step is equal. Treads = risers − 1, total run = treads × tread depth, and the stringer (the sloping side board) = √(rise² + run²). It assumes one straight flight with no landing. The formula: Risers = total rise ÷ riser height (rounded); treads = risers − 1; total run = treads × tre…