🪜 Staircase Calculator
Calculate the ideal number of steps, riser height, and tread depth using the Blondel Formula.
*Height from finished floor to finished floor.
*Standard is 17cm - 18cm.
How to Design a Comfortable Staircase?
Designing a staircase is not just about fitting steps into a space; it's about safety and ergonomics. Civil engineers and architects use the "Blondel Formula" to ensure the stairs are comfortable to walk on.
The Blondel Formula (Step Rule):
2 × Riser + Tread = 63 cm (±2)
This formula ensures that the stride length feels natural. If the steps are too shallow or too high, it creates a tripping hazard.
Standard Dimensions Table
Different types of buildings require different stair dimensions. Here are the global standards:
| Stair Type | Ideal Riser (Height) | Ideal Tread (Depth) |
|---|---|---|
| Private House | 17 cm - 18 cm | 28 cm - 30 cm |
| Public Building | 15 cm - 16 cm | 30 cm - 32 cm |
| Garden / Park | 12 cm - 14 cm | 35 cm+ |