DDimensions.
Architecture · Stairs

Stair Riser & Tread Dimensions

Standard riser height and tread depth for comfortable, code-compliant stairs.

R 196 mm / 7¾ in maxT 254 mm / 10 in min

Description

Riser height and tread depth work together to define stair comfort and safety. A common rule of thumb is 2 × riser + tread = 610–635 mm (24–25 in). Steeper stairs (taller riser, shorter tread) save space but are less comfortable and often restricted by code.

Notes

  • Riser height should be consistent (±3/16 in) within a single flight to reduce trip hazards.

Sources

  • International Residential Code (IRC)
  • IBC
  • Architectural Graphic Standards

Tags

Values

Maximum riser heightMaximum
196 mm7¾ in
Comfortable riser heightRecommended
165–180 mm6½–7 in
Minimum tread depthMinimum
254 mm10 in
Comfortable tread depthRecommended
280–305 mm11–12 in

Related dimensions

914 mm
36 in

Stair Width (Clear)

Architecture

Minimum clear width of a stairway, measured between finished wall surfaces.

stairswidthegress
864–965 mm
34–38 in

Handrail Height

Architecture

Height of stair and ramp handrails, measured vertically above the tread nosing or ramp surface.

handrailstairsramp