Example 1
- Height difference: 0.6 m
- Horizontal distance: 6 m
Slope: 10.0%
Angle: 5.71°
What slope is 0.6 m over 6 m? 0.6 ÷ 6 × 100 → 10.0% (5.71°).
Slope Percent Calculator
Enter the height difference and horizontal distance in the header unit. The calculator divides rise by run, multiplies by 100, and shows the angle. A 0.6 m drain on 6 m is 10.0% and 5.71°. A 1.2 m driveway on 8 m is 15.0% and 8.53°. A 0.35 m terrace on 2.5 m is 14.0% and 7.97°.
Results
Height difference (m) and Horizontal distance (m). The result shows up here.
Slope-percent estimate for decks, driveways, and drainage. Roof angle is on the roof pitch angle page. Related: ridge height.
How the results are calculated
rise0.6 m
run6 m
%10.0
The slope calculator computes incline from two lengths. The formula is (height difference ÷ horizontal distance) × 100. Angle is arctan(rise/run). Slope length is √(rise² + run²). Both fields use the header unit.
A 0.6 m drain over 6 m is 10.0% and 5.71°. A 1.2 m driveway on 8 m is 15.0% and 8.53°. A 0.35 m terrace on 2.5 m is 14.0% and 7.97°. A roof with 2.8 m rise and 4.0 m half-span is on the roof-pitch page: 34.99° and 70.0%.
Enter height difference and horizontal distance in the same unit. Run is horizontal, not along the slope. A comma in 0.6 works the same as a period. An empty run cannot divide.
Roof angle from half-span lives on the roof-pitch page. Ridge height at 8 m, 35°, and a 2.8 m wall is 5.60 m. The 3-4-5 tool checks a right angle, not slope percent.
One percent over 6 m is 6 cm of rise. Ten percent on the same run is 60 cm. Enter sixty centimeters as 0.6, not as 60.
Enter 0.6 and 6, click Calculate — you should get 10.0% and 5.71°. Then 1.2 and 8: 15.0% and 8.53°.
How to use this calculator
- Enter height difference in the header unit, for example 0.6. Sixty centimeters is 0.6, not 60.
- Enter horizontal distance (run), for example 6. Slope length is computed automatically.
- Click Calculate. 0.6 over 6 m is 10.0% and 5.71°. 1.2 over 8 m is 15.0% and 8.53°.
- Roof angle from half-span is on the roof-pitch page, not here.
- The 3-4-5 tool checks a right angle. This page calculates slope percent.
Formula
slope % = (rise ÷ run) × 100
angle = arctan(rise ÷ run) · length = √(rise² + run²)
0.6 m over 6 m: 10.0% and 5.71°. A 1.2 m driveway on 8 m: 15.0% and 8.53°.
% and angle
Rise divided by run, times 100. A 0.6 m drain over 6 m is 10.0% and 5.71°. A 1.2 m driveway on 8 m is 15.0% and 8.53°.
- %
- Slope. 0.6 ÷ 6 × 100 = 10.0. A 0.35 ÷ 2.5 terrace is 14.0%.
- °
- Angle from arctan. At 10.0% that is 5.71°. At 15.0% that is 8.53°.
- mm/m
- 10% = 100 mm per meter of run. 2% over 6 m is 12 cm of rise.
- run
- Horizontal distance. Not slope length — that comes from √(rise² + run²).
Example scenarios
Example 2
- Height difference: 1.2 m
- Horizontal distance: 8 m
Slope: 15.0%
Angle: 8.53°
A 1.2 m driveway rise on 8 m → 15.0% and 8.53°.
Example 3
- Height difference: 0.35 m
- Horizontal distance: 2.5 m
Slope: 14.0%
Angle: 7.97°
A 0.35 m terrace rise on 2.5 m → 14.0% and 7.97°.
Related calculators
Frequently asked questions
How do I calculate slope percent from rise and run?
Divide height difference by horizontal distance and multiply by 100. 0.6 m over 6 m → 10.0%. The angle is arctan(0.1) ≈ 5.71°.
What slope is 0.6 m over 6 m?
10.0% and 5.71°. A 1.2 m driveway rise on 8 m is 15.0% and 8.53°. A 0.35 m terrace on 2.5 m is 14.0%.
Is this a percentage-decrease calculator for prices?
No. Here you compute grade: rise ÷ run × 100. A financial percent decrease compares an old value with a new one — a different formula.
Does the result replace a driveway, deck, or roof design?
No. It is a geometry estimate. Codes and project documents still apply.
Is this a free slope percent calculator?
Yes. Enter rise and run in the header unit and you see percent, angle, and mm/m at once. No account required.
How is slope percentage calculated?
The calculator divides height difference by horizontal distance and multiplies by 100. At 0.6 m over 6 m the result is 10.0%. The angle is arctan(rise/run): 5.71°.
How does run differ from slope length?
Run is horizontal. Slope length is the hypotenuse √(rise² + run²). At 0.6 m and 6 m that is about 6.03 m.
Which unit should I use for a 60 cm rise?
Enter 0.6 in the header unit (meters). Entering 60 would treat it as 60 m of rise and overstate the result a hundred times.
How does slope differ from roof pitch?
Here you compute rise/run as a percent. A roof with 2.8 m rise and 4.0 m half-span is 34.99° and 70% on the roof-pitch page — different context, same ratio idea.
What does the mm/m result mean?
It is fall in millimeters per meter of run. 10% is 100 mm/m. At 2% over 6 m the height difference is 12 cm.
Does a comma in 0.6 work?
Yes. A comma and a period are the same height. At 0.6 m over 6 m the result stays 10.0% and 5.71°.
What is the primary result?
Slope percentage, for example 10.0%. Angle, slope length, and mm/m appear beside it.
Where do I calculate ridge height from an angle?
On the ridge-height page. An 8 m span, 35°, and a 2.8 m wall give 5.60 m. This calculator stays slope percent.
How does 3-4-5 differ from slope?
3-4-5 checks a right angle. Slope computes rise over run. They are two different tools.
What if horizontal distance is zero?
There is nothing to divide by. Horizontal distance must be greater than zero.
Knowledge sources
Slope percent is (rise ÷ run) × 100. Angle from arctan. Units below from NIST.
- Wikipedia — grade (slope)
- Wikipedia — inverse trigonometric functions
- NIST — Office of Weights and Measures
Page updated October 29, 2026.