Gradient Converter: Ratio, Percentage and Degrees

Convert a slope between rise:run ratio, percentage and degrees. These formats describe the same relationship between vertical change and horizontal distance.

Worked example: 1:8 equals 12.5%, or approximately 7.125°. A 45° slope is 100%, not 45%.

Use a negative rise, percentage or angle for a falling slope. Level ground is 0%, 0° or 0:1. Ratios use horizontal run rather than distance along the slope.