Ramp Slope Calculator
Accessibility gradients and required ramp lengths
Generic accessibility guidance — local building codes and accessibility regulations always prevail.
Required length at common slopes
| Slope | Ratio | Required length |
|---|
About Ramp Slope Calculator
The ramp slope calculator sizes accessibility ramps. Give it the height to overcome and it either tells you how long the ramp must be at a chosen slope, or — if your space is fixed — checks whether the length you have produces an acceptable gradient. Results show the slope as a percentage, an angle, and a 1:n ratio.
The verdicts follow widely used accessibility guidance: slopes of 5% (1:20) or gentler are comfortable for wheelchair users, slopes up to 8% (roughly 1:12) are acceptable for short runs with landings, and anything steeper is flagged as too steep for independent wheelchair use.
A reference table lists the required ramp length at every common slope for your rise, and a side-view diagram updates live. It is a free browser tool for quick feasibility checks on entrances, thresholds, and site paths — local accessibility regulations always take precedence over these generic values.
How to use Ramp Slope Calculator
- Enter the total rise to overcome, in centimeters.
- Choose a mode: find the required length from a slope, or check the slope of your available length.
- Set the slope percentage or the available horizontal length in meters.
- Read the ramp length, slope, angle, and ratio, plus the accessibility verdict.
- Compare alternatives in the required-length table for common slopes.