Example 1
- Total rise: 2.8 m
- Number of steps: 16
Step height: 17.50 cm
This sits within a common and comfortable practical range.
Stair step height calculator
Type total height and the number of risers. The calculator divides height by the count and shows centimetres. A 2.8 m storey and 16 risers is 17.50 cm. At 3.0 m and 17 steps you get 17.65 cm.
Step height is one of the key comfort knobs - a quick check that your planned step count makes sense. Related: 3-4-5 ratio.
Results
Total rise (m), Number of steps and Tread depth (cm). The result shows up here.
How the results are calculated
The stair calculator counts one riser height. The formula is total rise divided by the number of steps. A comfortable range is usually about 15-20 cm. When you type tread depth, the calculator also shows the Blondel check 2h+s, a comfort sketch of the flight.
A 2.8 m story and 16 steps is 17.50 cm, a typical house flight. At 3.0 m and 17 steps you get 17.65 cm. A lower 2.65 m ceiling and 15 steps is 17.67 cm. Fifteen steps on 2.8 m would be 18.67 cm, tighter at the knee; seventeen on 2.8 m would be 16.47 cm.
Type total rise in the header unit, for example 2.8, and the step count. Tread depth in centimeters is optional. A comma and a period are the same rise. The result is in centimeters even though rise is in meters.
A square landing is the 3-4-5 ratio page. Driveway slope next door is a percent, not a riser. Concrete for 1.2×0.3×0.18 m treads lives on concrete volume.
A tall riser wears you out on daily trips; a short one lengthens the flight and eats floor. Change the count and compare 17.50 with 16.47 or 18.67 at the same 2.8 m. The result is a quotient, not a building-code stamp.
Type 2.8 and 16, click Calculate, and match 17.50 cm. Then 3.0 and 17: 17.65 cm, the second card.
How to use this calculator
- Type total rise in the header unit, for example 2.8 from finished floor to finished floor.
- Enter the number of steps, for example 16. That is risers, not landings.
- Leave tread depth in cm empty when height alone is enough. Blondel 2h+s appears with depth.
- Click Calculate. 2.8 m and 16 steps give 17.50 cm. 3.0 m and 17 give 17.65 cm.
- If the result sits outside 15-20 cm, change the step count and compare variants.
h and the riser count
2.8 m and 16 risers is 17.50 cm. 3.0 m and 17 steps is 17.65 cm. A comfort band is usually 15-20 cm.
- cm
- One riser height. 17.50 at 2.8 m and 16. 17.65 at 3.0 m and 17.
- Blondel
- The 2h+s sketch when you type going. It does not replace a design or a code.
Example scenarios
Example 2
- Total rise: 3.0 m
- Number of steps: 17
Step height: 17.65 cm
A small change in the number of steps can noticeably improve stair comfort.
Example 3
- Total rise: 2.65 m
- Number of steps: 15
Step height: 17.67 cm
This is another example showing that a comfortable result often comes from testing several step-count options.
Example 4
- Rise: 2.8 m
- Steps: 17
Step height: 16.47 cm
How tall is one riser on a 2.8 m story with 17 steps? Step height: 16.47 cm.
Example 5
- Rise: 2.4 m
- Steps: 14
Step height: 17.14 cm
How tall is one riser on a 2.4 m basement flight with 14 steps? Step height: 17.14 cm.
Example 6
- Rise: 3.2 m
- Steps: 18
Step height: 17.78 cm
How tall is one riser on a 3.2 m story with 18 steps? Step height: 17.78 cm.
Example 7
- Rise: 2.8 m
- Steps: 16
- Tread: 28 cm
Step height: 17.50 cm · 2h+s = 63
How tall is one riser on 2.8 m with 16 steps and a 28 cm tread? Step height: 17.50 cm, 2h+s = 63.
Example 8
- Rise: 1.6 m
- Steps: 9
Step height: 17.78 cm
How tall is one riser on a 1.6 m split landing with 9 steps? Step height: 17.78 cm.
Related calculators
FAQ
How many cm is a step at 2.8 m and 16 risers?
17.50 cm. 2.8 / 16 = 0.175 m. That is the first card example, inside the 15-20 cm comfort band.
How many cm at 3.0 m and 17 steps?
17.65 cm. Still inside 15-20 cm. A taller storey, one more riser than 2.8 m with 16.
How many cm at 2.65 m and 15 steps?
17.67 cm. A lower ceiling, fewer risers, a similar step height to 16 on 2.8 m.
What range is comfortable?
Usually about 15-20 cm. 2.8 m and 15 risers is 18.67 cm; 2.8 m and 17 is 16.47 cm.
What does Blondel 2h+s do?
It adds two riser heights and the going. It appears when you type going in cm. A comfort sketch, not a code.
Should I type 2.8 in centimetres?
The field is metres. 2.8 m is a storey. Typing 280 would mean 280 m.
Where do I check a landing right angle?
On the 3-4-5 proportion page. This calculator stays step height, with no landing angle.
Does a blank going break 17.50 cm?
No. Height comes from total rise and the riser count. Going only attaches Blondel.
How many risers on 2.8 m to stay near 17.5 cm?
16, as on the page. 15 gives 18.67 cm, 17 gives 16.47 cm. Same 2.8 m.
Does 17.50 cm replace a stair design?
It is a quotient of two fields. Flight width, a handrail, and the code stay off the calculator.
Knowledge sources
Volume and waste come from the sizes you type. Below are volume and NIST SI units.
Page updated in 2026.