📐 Stair Ergonomics & Riser Calculator

Stair Calculator & 2D Blueprint

Design comfortable and safe stairs according to Blondel's rule. Verify riser height, tread depth, and headroom clearance.

Blondel : 630 mm

Total Floor-to-Floor Height (H) (mm)

Stairwell Run Length (L) (mm)

Stairwell Opening Length (mm)

Floor Structure Thickness (mm)

Blondel's Ergonomics Rule (2h + g)630 mm

Headroom Clearance2 120 mm

Side-View Stair Blueprint (2D Render)Angle : 36.6°

Step Count15

Riser Height (h)173 mm

Tread Depth (g)250 mm

Stringer Total Length4 360 mm