How many steps does a staircase need for a 10 ft (3 m) floor height? What should the riser and tread be, how big must the staircase room be, and how much concrete does an RCC stair take? This guide answers all of it with the standard formulas, a worked dog-legged staircase example and a free staircase calculator.
| Riser (house) | 150 – 190 mm (max 190 mm) |
|---|---|
| Tread (house) | 250 mm minimum; 250 – 300 mm is comfortable |
| Comfort rule | 2R + T ≈ 600 – 650 mm |
| Width | 0.9 – 1.0 m minimum for houses (check local bylaws) |
| Headroom | at least 2.2 m |
| Max risers per flight | 15 |
Staircase formulas
Actual riser R = floor-to-floor height ÷ n
Treads per flight = risers in that flight − 1
Going of a flight = treads × tread width T
Comfort check: 2R + T ≈ 600 – 650 mm
Worked example: dog-legged stair, 3.0 m floor height
- Risers: 3,000 ÷ 175 = 17.1 → round up to 18 risers
- Actual riser: 3,000 ÷ 18 = 166.7 mm
- Flights: two flights of 9 risers each, with a mid-landing
- Treads: 9 − 1 = 8 per flight (16 in total), tread 250 mm
- Going per flight: 8 × 250 = 2.0 m
- Comfort: 2 × 166.7 + 250 = 583 mm (acceptable; a 270 mm tread gives 603 mm)
- Staircase room: width = 2 × 1.0 + 0.1 m gap = 2.1 m; length = 2.0 m going + 1.0 m mid-landing = 3.0 m, plus the floor landing at the top and bottom
Concrete and steel quantity for an RCC staircase
An RCC stair flight has two parts: an inclined waist slab and the triangular steps cast on top of it. Add the landing slab separately.
Waist slab = inclined length × width × waist thickness
Steps = number of treads × ½ × R × T × width
Landing = landing length × landing width × thickness
For the example above with a 150 mm waist slab and 1.0 m width: each flight’s inclined length is √(2.0² + 1.5²) = 2.5 m, so the waist is 0.375 m³ and the steps 0.167 m³. Two flights = 1.083 m³, plus a 1.0 × 2.1 m landing at 150 mm = 0.315 m³. Total ≈ 1.40 m³, which needs about 11.3 bags of cement in M20 (see cement bags per m³) and roughly 110 kg of steel at about 1% steel. Prepare the exact bar list with the BBS Generator.
Free staircase calculator
Ready table: steps for common floor heights
| Floor-to-floor height | Risers | Riser height | Treads (250 mm) | Going, dog-legged flight |
|---|---|---|---|---|
| 2.7 m (9 ft) | 16 | 168.8 mm | 14 | 1.75 m |
| 2.9 m | 17 | 170.6 mm | 15 | 2.0 m (9 + 8 risers) |
| 3.0 m (10 ft) | 18 | 166.7 mm | 16 | 2.0 m |
| 3.2 m | 19 | 168.4 mm | 17 | 2.25 m (10 + 9 risers) |
| 3.3 m (11 ft) | 19 | 173.7 mm | 17 | 2.25 m |
| 3.6 m (12 ft) | 21 | 171.4 mm | 19 | 2.5 m (11 + 10 risers) |
Types of staircase for houses
- Dog-legged: two flights in opposite directions with a mid-landing. The most space-efficient and the most common in Indian houses.
- Open-well: like dog-legged but with a gap (well) between flights; needs a wider room but feels more open.
- Straight: one flight; needs a long narrow space and a landing if it has more than 15 risers.
- Quarter-turn (L-shaped): turns 90° at a landing; fits in a room corner.
Common staircase mistakes
- Unequal risers. The first or last step ends up a different height because floor finish thickness was ignored. Calculate from finished floor to finished floor.
- Too little headroom under the beam or the flight above.
- Steep stairs (riser over 190 mm, tread under 250 mm) to save space; uncomfortable and unsafe for elderly people and children.
- Missing handrail or a railing lower than about 900 mm.
Frequently asked questions
How many steps are needed for a 10 feet height?
For 10 ft (about 3.0 m) floor-to-floor height, 18 risers of about 167 mm (6.6 inches), with 16 treads in a dog-legged stair.
What is the standard riser and tread for a house?
A riser of 150–190 mm (maximum 190 mm) and a tread of at least 250 mm. Around 165–175 mm riser with a 250–275 mm tread is comfortable.
What size staircase room is needed for a house?
For a dog-legged stair with 1.0 m wide flights and a 3.0 m floor height, about 2.1 m × 3.0 m, plus space for the floor landing.
What is the waist slab thickness of a staircase?
Typically 125–175 mm for houses, depending on the span. It must be designed for the actual span and loads.
Related guides
- Column, Beam & Footing Size for G+1 / G+2 House
- Cement Bags in 1 m³ of Concrete
- House Construction Cost in India 2026
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