Ramp Length Calculator
Horizontal run, sloping length and angle of a ramp for a given rise and gradient.
Results
Length
7.500
m
Length
7.513
m
Angle
3.434
°
Ratio
16.67
What this tool does
Accessibility rules are written as a ratio or a percentage and vary by country, with 1:12 (about 8.3 %) common for short rises and gentler gradients required for longer ones — check the regulation that applies where you are building. The sloping length is what you actually have to buy or build.
Formula
length = height ÷ (slope ÷ 100)
Variables
| Symbol | Meaning | Unit |
|---|---|---|
h | Height | cm |
sl | Slope | % |
L | Length | m |
LR | Length | m |
A | Angle | ° |
RA | Ratio | — |
Worked example
- Height45 cm
- Slope6 %
- Length7.500 m
- Length7.513 m
- Angle3.434 °
- Ratio16.67
Limitations
- For work that must comply with a standard or be signed off, check the result against the applicable code and have it reviewed by a qualified engineer.
- The result is an estimate based only on the values you type. Real situations often include factors this calculator does not know about.