Slope Grade Calculator

Quickly convert site measurements into clear grades. Supports rise-run, elevation change, and slope angles too. Export results to CSV or PDF for your team.

Input Options
Choose what you know, then calculate all slope outputs.
Units
Pick the input set you have available.
Vertical change. Use negative for downward.
Horizontal distance (must be greater than zero).
Reference elevation at the start.
Reference elevation at the end.
Plan distance between elevations (must be greater than zero).
Example: 5% means 5 rise per 100 run.
If provided, the calculator estimates rise and slope length.
Valid range: -89.9 to 89.9 degrees.
If provided, the calculator estimates rise and slope length.
Clear
Tip: Keep units consistent for every value.
Example Data Table
These sample cases show typical rise/run inputs and outputs.
Case Rise Run Grade (%) Angle (deg) Ratio (rise:run)
Site ramp0.6012.005.00002.86241 : 20.000
Drainage fall-0.2510.00-2.5000-1.43211 : 40.000
Access road1.5030.005.00002.86241 : 20.000
Formula Used
Negative rise produces a downward grade and negative angle.
How to Use This Calculator
  1. Select what you know: rise/run, elevations, percent, or angle.
  2. Enter values in consistent units (m or ft).
  3. Press Calculate to view results above the form.
  4. Use Download CSV or Download PDF to share outputs.
  5. Use Reset to start a new scenario.
For elevations, rise is End minus Start. For percent/angle, add an optional run to estimate rise and slope length.

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Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.