Stair Design Calculator

From a floor-to-floor height to a fully dimensioned stair: risers, treads, flights and landings, with the comfort check and the width it needs as an exit. It is the stair counterpart to the ramp calculator.

• Number of risers and the riser height.
• Tread depth and total run.
• Flights, landings and landing depth.
• The two-risers-plus-one-tread comfort check, handrails and the governing exit width.
• Follows: PD 1096 (National Building Code), Rule XII, Section 1207.5; RA 9514 (Fire Code of the Philippines), exit stairs; BP 344 (Accessibility Law), where the stair is on an accessible route.
• The exit width depends on the occupant load the stair serves, so run the fire exit calculator first for a building with more than one storey.

• Accessible Ramp Calculator (BP 344)
• Fire Exit Width Calculator (Fire Code)
• Occupant Load Calculator (Philippines)
• Step-by-step guide: Stair Design Calculator