Fall and slope calculator (embed)

Slope calculator

Lengths in millimetres or feet and inches. The same maths as the Pitch calculator in the MeisterCalc app.

This calculator needs JavaScript, which is turned off or didn't load. You can still do it by hand: the formulas, the conversion chart and the worked examples below give the same answers.

Units

Millimetres Feet and inches

What do you want to work out?

Slope from rise and run Convert a slope Rise over a length Length for a rise

Rise (or drop)

The height difference from end to end.

Length (measured level)

The horizontal run, not the length along the slope.

Slope as a ratio
Percentage
Degrees
Rise ÷ run
Millimetres per metre
Inches per foot
Rise or drop
Length, measured level
Length along the slope

Rise or drop at this slope over

Length	Rise or drop
1 m
2 m
3 m
5 m
10 m
20 m

This is arithmetic, not a compliance ruling. The slope or fall a job needs comes from the code, the drawings and your council: see the common falls and their sources below.

Calculator by MeisterCalc: formulas and worked examples on the full page.