# Stair Stringer Calculator

> Calculate stair stringer length, number of steps, rise and run per step, and slope angle from the walking-surface total rise and the total run.

**URL:** https://www.calculatoranswers.com/stair-stringer-calculator
**Category:** Home

## Quick Answer

Calculate the required lumber length, step counts, and rise/run cutting dimensions for a stair stringer from your walking-surface total rise and total run.

## Definition

A stair stringer calculator is a carpentry planning tool used to determine the dimensions of the structural boards (stringers) that support a staircase. It divides the total vertical rise, measured between walking surfaces at both ends, by a target step rise to compute the total number of risers and treads, then calculates the actual rise, actual run, incline angle, and the exact stringer board length needed. This helps carpenters lay out and cut the sawtooth patterns accurately while meeting local building codes.

## How to Use

1. **Enter total vertical rise** — Measure straight down from the upper landing's walking surface to the lower floor's walking surface. Count any flooring still to be laid at either end, because the calculator divides this figure into equal risers and a forgotten floor thickness lands entirely on the bottom step.
2. **Enter total horizontal run** — Provide the total horizontal distance the stairs are allowed to cover.
3. **Specify target riser height** — Type your desired step rise height (usually between 7 and 7.5 inches).
4. **Read stringer cut layouts** — Review the calculated riser count, tread count, actual riser/tread dimensions, incline angle, and required lumber board length.

## Disclaimer

This calculator provides estimates for educational and planning purposes. Always consult a qualified professional for specific advice on financial, medical, legal, or other regulated decisions.

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