Stairs Riser Calculator
Calculate the number of risers, treads, and total staircase run from floor height.
How to Use the Stairs Riser Calculator
- Enter floor-to-floor height in cm.
- Enter desired riser height.
- Enter tread depth.
- Click Calculate.
Quick Reference
| From | To |
|---|---|
| 250 cm floor, 17 cm riser | 15 risers, 14 treads |
| 280 cm floor, 18 cm riser | 16 risers, 15 treads |
| 300 cm floor, 17 cm riser | 18 risers, 17 treads |
| Comfortable angle | 30–37° |
| Code max riser | ~20 cm |
| Code min tread | ~25 cm |
Use Cases
- •Designing a new staircase.
- •Checking building code compliance.
- •Planning staircase materials.
- •Remodeling existing stairs.
Formula
Risers = ceil(Floor height / Riser height). Treads = Risers − 1. Total run = Treads × Tread depth.
Frequently Asked Questions
What is ideal riser height?
15–20 cm (6–8 inches) is the comfortable range; 17–18 cm is most common.
What about tread depth?
25–30 cm (10–12 inches) is standard for comfortable treads.
Is it free?
Yes, all calculators are completely free.