Stair calculator

Calculate steps, riser height, going, angle and the Blondel formula.

Straight staircase sizing

Enter the total rise and available run. The calculator adjusts the number of risers around the target riser height.

Total rise

Available run

Target riser height

Number of risers—

Number of treads—

Actual riser height—

Going—

Blondel (2H + G)—

Angle—

Stringer length—

Comfort—