How it works
Calculate slope percentage and angle from rise and horizontal run in the same unit. Material rules and local codes are not evaluated.
Inputs and units
| Input | Example value | What to enter |
|---|---|---|
| Vertical rise | 1.5 | Enter a numeric value. Use a non-negative value. |
| Horizontal run | 4 | Enter a numeric value. Must be greater than zero. |
Worked example
Show example inputs and results
This example is generated by the same calculation engine using the starting values in the form. Your own inputs produce your own result.
- Vertical rise
- 1.5
- Horizontal run
- 4
Complete example results
- Slope
- 37.5 %
- Angle
- 20.55604522 °
Reading the result
Convert measurements to the same unit and use the net area to cover. Replace any package, waste or efficiency input with your product information. A quantity estimate alone does not determine installation conditions.
Questions and answers
Can I use the example values for my own calculation?
The example values illustrate the calculation. Replace every input with your own information, especially dates, rates and the selected operation.
Why are some results rounded?
Results display up to 8 decimal places. Calculations use the unrounded values; very small values use scientific notation. JavaScript floating-point arithmetic can introduce tiny rounding differences.
Are my inputs sent to a server?
The calculator processes inputs in your browser. Its code does not send your values to a server.