Grade expresses vertical rise as a percentage of horizontal run.
Slope Percentage Calculator
Form
Results
Angle
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Slope percentage
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Table of Contents
1
What is Slope Percentage?
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How to Use This Calculator
- Enter or select Rise, Run.
- Check the unit beside each measurement. For a percentage or rate, use the scale and time period stated in the form.
- Choose Calculate, then compare the output with the formula and example below. If you change a value or option, calculate again to update the result.
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Formula Used
Grade (%) = rise/run × 100; angle = arctan(rise/run)
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Variables Explained
| Input | What it means |
|---|---|
| Rise | The vertical change between the two elevations, in a consistent length unit. |
| Run | Horizontal distance corresponding to the rise, rather than the sloping surface length. |
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Worked Example
A rise of 1 m over 4 m horizontally is 25%, or about 14.04°.
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Why Use This Calculator?
Use the result to put measurements on a common basis before comparing them or estimating quantities. The original measurement precision still limits the precision of the answer.
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Common Mistakes
- A 25% grade is not a 25° angle; use horizontal run rather than slope length.
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Frequently Asked Questions
When should I round a measurement?
Carry the measured values and conversion factors through the calculation first. Round the final result to a precision justified by the original measurements.
Why can a supplier’s quantity differ?
Measurement conventions, nominal sizes, density assumptions and purchase rounding can change a practical quantity. Compare the units and assumptions before comparing the numbers.
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Sources & References
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