IRC Stair Code Requirements
Max rise: 7-3/4 in • Min run: 10 in • Min width: 36 in • Min headroom: 6 ft 8 in • Nosing: 3/4 to 1-1/4 in projection • Handrail: 34-38 in height. Rise must be consistent within 3/8 in between steps.
Max rise: 7-3/4 in • Min run: 10 in • Min width: 36 in • Min headroom: 6 ft 8 in • Nosing: 3/4 to 1-1/4 in projection • Handrail: 34-38 in height. Rise must be consistent within 3/8 in between steps.
Use this free staircase calculator to get instant, accurate results for your construction project. Simply enter your measurements above and the calculator will automatically compute the result using industry-standard formulas.
Pro Tip: Always add 10-15% extra material to account for waste, cuts, and job-site conditions. This is standard practice recommended by experienced contractors.