Stairs Calculator
Calculate stair rise, going, step count and stringer length for AU residential stairs.
Estimate only — not a substitute for a licensed tradesperson, a certified engineer, or sign-off from your local building surveyor. Verify against current standards and site conditions before ordering materials or starting work.
Result
- Number of risers
- 15
- Actual riser height (kept within 115-190mm)
- 180mm
- Number of goings
- 14
- Going used in calculation
- 250mm
- Total going (horizontal run)
- 3,500mm
- Stringer length
- 4,420.41mm
NCC Housing Provisions Table 11.2.2a (verified 2026-08-20 against both the NCC 2022 and NCC 2025 editions on ncc.abcb.gov.au - identical figures in both). NCC 2022 remains the legally operative edition in most states/territories until each jurisdiction adopts NCC 2025 on its own timeline (e.g. NSW and QLD both adopt 1 May 2027) - confirm which edition currently applies where you're building, and check for any state-specific variation, before relying on this.