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Stairs Calculator

Compute stair dimensions from total rise and run. Get number of steps, riser height, tread depth, slope angle, and comfort check.

Enter total rise, total run, and target riser height to calculate stair dimensions.

Stairs Calculator

Designing a staircase requires balancing comfort, safety, and available space. This calculator computes the number of steps, riser height, tread depth, and slope angle from the total rise and run of the staircase.

The comfort rule 2R + T (twice the riser height plus the tread depth) should fall between 60 and 65 cm for a comfortable staircase. Building codes typically require risers between 15–20 cm and treads no less than 22 cm.

How it works

Steps = Total Rise ÷ Target Riser Height (rounded). Actual Riser = Total Rise ÷ Steps. Tread Depth = Total Run ÷ (Steps − 1). Slope Angle = arctan(Total Rise ÷ Total Run). All dimensions in meters, converted to cm for display.

Use cases

  • Designing a new staircase for a building project
  • Verifying stair dimensions meet building code requirements
  • Planning deck or porch stairs
  • Calculating materials needed for stair construction

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