Estimate a straight stair’s riser and tread counts from the floor height and proposed dimensions.
Stair Calculator
Form
Results
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Table of Contents
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What is Stair?
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How to Use This Calculator
- Enter or select Floor to Floor Height, Riser Height (Step Height), Tread Depth (Step Width), Stair Width.
- Check the unit beside each measurement. For a percentage or rate, use the scale and time period stated in the form.
- Choose Calculate, then compare the output with the formula and example below. If you change a value or option, calculate again to update the result.
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Formula Used
Riser count ≈ total rise/proposed riser height; actual riser = total rise/integer count
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Variables Explained
| Input | What it means |
|---|---|
| Floor to Floor Height | Vertical body or object measurement. Select its actual unit before calculating. |
| Riser Height (Step Height) | Vertical body or object measurement. Select its actual unit before calculating. |
| Tread Depth (Step Width) | The crosswise measurement, perpendicular to the length. |
| Stair Width | The crosswise measurement, perpendicular to the length. |
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Worked Example
A 2.8 m rise with 16 equal risers gives a riser height of 175 mm.
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Why Use This Calculator?
Use the result to put measurements on a common basis before comparing them or estimating quantities. The original measurement precision still limits the precision of the answer.
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Common Mistakes
- Riser count and tread count can differ. Final dimensions must satisfy the applicable building rules.
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Frequently Asked Questions
When should I round a measurement?
Carry the measured values and conversion factors through the calculation first. Round the final result to a precision justified by the original measurements.
Why can a supplier’s quantity differ?
Measurement conventions, nominal sizes, density assumptions and purchase rounding can change a practical quantity. Compare the units and assumptions before comparing the numbers.
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Sources & References
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