Math & Geometry
Slope Calculator
Calculate slope from rise and run, including percent grade and angle.
- Free to use
- Runs in your browser
- Level A · Standard formula
- Last reviewed 2026-08-16
Calculator guide
How to use the Slope Calculator
Calculate slope from rise and run, including percent grade and angle. Enter the requested values and select Calculate. The result and supporting values are produced locally in your browser.
Formula
Worked example
A rise of 3 over a run of 12 has slope 0.25, a 25% grade, and an angle of about 14.04°.
What to keep in mind
- Rise and run must use the same unit for the slope ratio to be dimensionless.
Methodology
This calculator uses deterministic arithmetic and performs the calculation locally in your browser. Verify assumptions, units, and source values for your specific use case.
Review standard: Level A · Standard formula. How calculator reviews work.
Frequently asked questions
What does this calculator calculate?
Calculate slope from rise and run, including percent grade and angle.
How is the result calculated?
Slope m = Rise ÷ Run.
Can I use the result for an important decision?
Use the result as a calculation aid and verify the inputs, assumptions, and applicable professional or regulatory requirements before relying on it for an important decision.
Does CalculateMeasure store the values I enter?
The calculator performs its arithmetic in your browser. The calculator itself does not need to send your entered values to a server to produce the result.