Concrete Stairs Calculator

Calculate concrete volume, formwork, and reinforcement for cast-in-place concrete stairs.

Total Rise (in) Floor to floor height

Stair Width (in)

Tread Depth (in)

Riser Height (in)

Waist/Slab Thickness (in) Thickness perpendicular to slope

Nosing Projection (in)

Total Rise (in)

Stair Width (in)

Tread Depth (in)

Riser Height (in)

Slab Thickness (in)

Landing Depth (in)

Landing Thickness (in)

Number of Landings

Number of Steps

Stair Width (in)

Tread Depth (in)

Riser Height (in)

Base Slab Thickness (in)

Base Extension Beyond Steps (in)

Total Rise (in)

Building Code

Target Riser (in) Preferred riser height

Max Available Run (in) Horizontal space available

Requirement	IRC (Residential)	IBC (Commercial)	ADA
Max Riser Height	7-3/4"	7"	7"
Min Tread Depth	10"	11"	11"
Min Width	36"	44"	36" clear
Min Headroom	6'-8"	6'-8"	6'-8"
Max Riser Variation	3/8"	3/8"	3/8"
Nosing Projection	3/4" - 1-1/4"	3/4" - 1-1/4"	1-1/2" max