construction ToolUpdated 2026-09-21
Stair Calculator & Stringer Layout
Building safe stairs requires exact mathematical spacing to prevent trip hazards and satisfy International Residential Code (IRC) requirements. Enter your total vertical rise to calculate the entire stair layout.
Frequently Asked Questions
What are standard residential stair code dimensions?
The International Residential Code (IRC) mandates a maximum riser height of 7.75 inches and a minimum tread depth of 10 inches. The variation between the tallest and shortest riser in a flight cannot exceed 3/8 inch.
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