Here, zero height difference gives a level result. The app instructions below require a positive rise.
In the app · English
Tools → Slope finder
For describing a measured incline. Enter the vertical difference between ends and the horizontal projection, not the distance along the slope.
- Rise
- The vertical difference must be greater than zero.
- Run
- The positive horizontal distance corresponding to that rise.
The calculation starts with rise and run and returns percent and degrees. It does not solve backwards from a requested slope or accept a signed fall.
- Slope percentage and angle above horizontal.
A small rise over a measured horizontal metre.
| Quantity | Value |
|---|---|
| Rise; run | 150 mm; 1000 mm |
| Slope; angle | 15 %; 8.531° |
Slope = 150/1000 × 100. Angle = atan(150/1000). A 15% grade is therefore not a 15° angle.
A slope of 1% is 10 mm of vertical change per horizontal metre, or 1 cm per metre. Percent divides vertical change by horizontal distance; the two lengths must use the same unit.
Example: a specified 2% fall over 5 m of horizontal distance needs 100 mm of fall: 5 × 2 ÷ 100 = 0.10 m. That is 20 mm per metre and an angle of approximately 1.146°, not 2°.
To check this geometry in Pro², enter positive rise magnitude 0.10 m and horizontal run 5 m. Record the downward direction separately on your plan. Measure from one stated datum; the example does not prescribe a drainage, pipe or accessibility gradient.
Use metric or imperial lengths consistently and keep extra precision until the final display. Rounded diagram labels are not a measuring tolerance.
The result describes geometry. It does not approve a ramp, roof or drainage gradient for a particular use. Use positive magnitudes and record the direction of fall separately.
Can I measure run along the inclined surface?
That is the hypotenuse, not the horizontal run. Use Right Triangle if you need to resolve those sides first.
What does 100% slope mean?
Rise equals horizontal run, so the angle is 45°, not vertical.
- Can I measure run along the inclined surface?
- That is the hypotenuse, not the horizontal run. Use Right Triangle if you need to resolve those sides first.
- What does 100% slope mean?
- Rise equals horizontal run, so the angle is 45°, not vertical.
Check your understanding of slope
Rise is 0.3 m and horizontal run is 4 m. What is the slope in percent? You do not need the sloping length for this question.
Show the answer and explanation
The slope is 7.5%. Divide rise 0.3 by horizontal run 4, then multiply by 100. Dividing by the sloping length would describe a different quantity.
Answer: 7.5% = 0.3 / 4 × 100.
Measurements, units and material terms
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