HomeExpertly
www.homeexpertly.comStair Calculator (USA)
Work out riser height, tread depth, total run, stringer length and stair angle, check them against IRC code limits, and download a professional PDF with a step-by-step marking schedule.
For estimation and planning only. Code limits shown reflect common IRC residential values (max riser 7¾″, min tread 10″, min headroom 6′-8″). Always confirm against your local adopted building code and have a licensed professional verify the final layout.
1
Stair dimensions
in
30″105″180″
in
4″6.5″9″
in
81216
in
244872
2
Details & clearances
in
in
in
IRC minimum headroom is 80″ (6′-8″).Number of steps (risers)
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Enter your dimensions and click Calculate
Layout breakdown
Total rise --
Stair angle --
Number of risers --
Number of treads --
Actual riser height --
Tread depth --
Total run --
Stringer length --
Quick summary
Steps (risers)
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Treads
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Riser height
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Tread depth
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Total run
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Stair angle
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Profile & code check
Side profile (to scale)
IRC code compliance
Calculate to run code checks.
| Step | Riser | Height from floor | Tread | Run from start |
|---|---|---|---|---|
| Calculate to see schedule | ||||
The highlighted row is the top landing (arrival at the upper floor). Heights are measured from the lower finished floor; run is measured horizontally from the face of the first riser.