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Stair Calculator

Explore uniform stair rise, tread count, total run, and incline.

Your measurements

Choose a unit beside each measurement. Switching units preserves your dimensions.

Your estimate

Enter measurements and select Calculate.

How this estimate works

The upper floor acts as the final landing, so treads = risers − 1. Rise per riser = total rise ÷ risers. Incline uses one rise and one tread run. Diagonal span uses total rise and total run; it is not a cut-stringer length. No headroom, nosing, tread thickness, landing, or structural checks. Verify applicable requirements before building.

Values are rounded only for display. Calculations stay on this device. No signup required.

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