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Stairs Calc

Finished floor

The walking surface after flooring is laid, from which total rise is measured.

The finished floor is the actual walking surface — after tile, hardwood, carpet, or screed is installed — as opposed to the bare subfloor or slab. Total rise must be measured finished-floor to finished-floor, because that is what your feet experience. Example: if you measure subfloor-to-subfloor and the upper floor gets ¾ in hardwood while the lower gets ½ in tile, your real rise is ¼ in different, which can throw a borderline riser height over the code limit. Always account for the finished thickness at both levels before sizing the number of risers. When flooring is not yet down, add the planned finish thickness to your raw measurement.

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Related terms

Total rise Vertical distance from the lower finished floor to the upper finished floor. Riser height The vertical height of a single step; every riser must be equal within 3⁄8 in. Number of risers How many equal steps the flight has; total rise divided by target riser, rounded.

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Written by the Stairs Calc editorial team. Methodology and code references: see our methodology.

Built and maintained by builders, drafters and engineers who plan stairs for a living — every code limit is transcribed from the published standard and cited to its exact section.

Last reviewed 2026-06-20 against IRC 2021/2024

Stairs Calc gives accurate geometry and checks it against published building-code limits, but results are estimates for planning. Codes are adopted and amended locally and change over time. Always confirm dimensions against your local adopted code and a licensed professional before you build.