FREE · CALCULATORS & CONVERTERS
Stair Calculator.
Find riser count, actual riser height, going, slope, stringer length and the 2R+G comfort check.
Riser count is rounded to the nearest whole number. 2R+G is compared with 600–650 mm as a comfort guide. Waist volume is optional. Local arithmetic only. This is a quantity or geometry estimate, not a code check and not a substitute for a licensed professional.
- Risers
- 16
- Treads
- 15
- Actual riser
- 0.175 m
- Total going
- 3.75 m
- Slope
- 34.99202 degrees
- Stringer length
- 4.680011 m
- 2R + G
- 600 mm
- Comfort guide
- Inside 600–650 mm
Risers are the floor height divided by the target riser, rounded to the nearest whole number. The stringer is the hypotenuse of the total rise and the total going. 2R+G is a comfort guide of 600–650 mm, not a national stair code.
How to use Stair Calculator
Enter the floor-to-floor height, a target riser and the tread. Choose whether treads equal the risers or risers minus one.
How it works
Find riser count, actual riser height, going, slope, stringer length and the 2R+G comfort check. Riser count is rounded to the nearest whole number. 2R+G is compared with 600–650 mm as a comfort guide. Waist volume is optional. Local arithmetic only. This is a quantity or geometry estimate, not a code check and not a substitute for a licensed professional.
Example
2.8 m floor height with a 175 mm target riser and a 250 mm tread.
Questions about Stair Calculator
Is Stair Calculator free, and do I need an account?
Yes. This tool is free to use in your browser without an account. Processing takes place on your device.
What are the limits and what should I check?
Riser count is rounded to the nearest whole number. 2R+G is compared with 600–650 mm as a comfort guide. Waist volume is optional. Local arithmetic only. This is a quantity or geometry estimate, not a code check and not a substitute for a licensed professional. Review the result before using it in your work.
Is my input sent to a server?
Your input is processed in your browser and is not uploaded by this tool. Files and pasted text are cleared when the page is refreshed. Normal website requests are still required to load the page and its libraries. Read the privacy explanation.