FREE ONLINE CALCULATOR

Stair Calculator

Size a simple straight stair using rise, riser height, tread depth and stringer geometry.

✓ Instant results ✓ Editable inputs ✓ Formula explained

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CONSTRUCTION · TOOLS

MEASURE Enter project dimensions

ESTIMATE Calculate material volume

PLAN Check practical assumptions

CALCULATION TOOL

Stair Calculator

Change any value and calculate again.

Uses the values you enter. No account required.

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ABOUT THIS TOOL

When to use a stair calculator

Size a simple straight stair using rise, riser height, tread depth and stringer geometry.

All assumptions are visible and adjustable. Check rates and underlying data against original sources before making a decision.

HOW IT WORKS

The calculation

Riser count = ceil(total rise / target max riser); each riser = total rise / riser count; tread count = risers − 1 for an upper landing; stringer ≈ hypot(total rise, horizontal run).

Read the full guide →

ASSUMPTIONS

Know the limitations

Generic straight-flight sizing only. Verify local building codes and account for nosing, finish thickness and landings.

Results are estimates derived from your inputs.