Stair Calculator
Work out the number of steps, the exact riser height and the total run for a staircase from its overall rise. Enter total rise, preferred riser…
8 of 8 free uses remaining today
Work out the number of steps, the exact riser height and the total run for a staircase from its overall rise. Enter total rise, preferred riser height and going (tread depth) to see number of risers, actual riser height and total run when you calculate.
Worked example
Example calculated from the starting values. Enter your own values and press Calculate to get your result.
With the default inputs (total rise = 2,700 mm, preferred riser height = 175 mm, going (tread depth) = 250 mm), the results are: number of risers 15; actual riser height 180.0 mm; total run 3,500 mm.
Quick reference: total rise vs result
Reference table based on the example values; it is not your calculation result.
| Total rise (mm) | Number of risers | Actual riser height | Total run |
|---|---|---|---|
| 1,350 | 8 | 168.8 mm | 1,750 mm |
| 2,700 | 15 | 180.0 mm | 3,500 mm |
| 5,400 | 31 | 174.2 mm | 7,500 mm |
| 13,500 | 77 | 175.3 mm | 19,000 mm |
| 27,000 | 154 | 175.3 mm | 38,250 mm |
| 54,000 | 309 | 174.8 mm | 77,000 mm |
Frequently asked questions
What formula does this calculator use?
Number of risers = round(rise ÷ riser); Actual riser height = rise ÷ n; Total run = (n-1) × go. Variables: rise = total rise in mm, riser = preferred riser height in mm, go = going (tread depth) in mm.
What do I need to enter?
You need total rise (mm), preferred riser height (mm), going (tread depth) (mm). Results update as you type.
What is an example result?
With the default inputs (total rise = 2,700 mm, preferred riser height = 175 mm, going (tread depth) = 250 mm), the results are: number of risers 15; actual riser height 180.0 mm; total run 3,500 mm.
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