Stair Calculator

Plan a straight staircase from total rise and available run. Get riser height, tread depth, stringer length and stair angle.

Project dimensions

Floor-to-floor height

Available horizontal run

Stair width

Number of risers

LIVE GEOMETRY · Stair geometry

LIVE ESTIMATE

Your results

Riser height175 mm

Tread depth253.3 mm

Stair angle36.4°

Stringer length4.72 m

Comfort value (2R + T)603 mm

Approx. footprint3.8 × 0.9 m

Practical guidance

Using this estimate

For preliminary planning only; stair rules vary by jurisdiction.

A common comfort check is 2 × riser + tread ≈ 600–660 mm. Verify headroom, landings, guards and handrails locally.

Measure the actual project before ordering and confirm product dimensions, pack sizes, structural requirements and local building rules with the relevant supplier or qualified professional.