SlopeCalc
Calculator

Rise, run, percent, degrees, and ratio

Slope calculator with six conversion modes

Convert the same geometric slope between rise over horizontal run, percent grade, per mille, angle, and 1:N ratio.

Private browser calculation

Choose the known representation

Stays on this page

Calculation mode

Known values and units

Rise may be signed; horizontal run must be positive.

SlopeCalc handles ideal geometric slope only. It does not determine permissible grades, building-code compliance, accessibility, drainage, traction, structural design, or measurement uncertainty.