Roof pitch to percent grade
Type a value in in per ft to get it in % instantly.
83.33%
That's 2.5× as steep as a standard roof pitch, while a 45 degree slope is 1.2× steeper. Over a kilometer on the map that climbs about 833.3 meters.
What it means
How steep is that?
Percent grade is rise over horizontal run. Road signs use the same definition, so a 10% hill climbs 10 m over 100 m of map distance, not of road.
The math
How to convert in per ft to %
To convert roof pitch to percent grade, multiply by 8.33333.
Example: 10 in per ft × 8.33333 = 83.3333 %.
In the other direction, 1 % = 0.12 in per ft.
Every unit
Your slope in every unit
Tables
in per ft to % conversion table
| in per ft | % |
|---|---|
| 0.5 in per ft | 4.16667 % |
| 1 in per ft | 8.33333 % |
| 2 in per ft | 16.6667 % |
| 3 in per ft | 25 % |
| 5 in per ft | 41.6667 % |
| 8 in per ft | 66.6667 % |
| 10 in per ft | 83.3333 % |
| 15 in per ft | 125 % |
| 20 in per ft | 166.667 % |
| 25 in per ft | 208.333 % |
| 45 in per ft | 375 % |
| 100 in per ft | 833.333 % |
% to in per ft conversion table
| % | in per ft |
|---|---|
| 0.5 % | 0.06 in per ft |
| 1 % | 0.12 in per ft |
| 2 % | 0.24 in per ft |
| 3 % | 0.36 in per ft |
| 5 % | 0.6 in per ft |
| 8 % | 0.96 in per ft |
| 10 % | 1.2 in per ft |
| 15 % | 1.8 in per ft |
| 20 % | 2.4 in per ft |
| 25 % | 3 in per ft |
| 45 % | 5.4 in per ft |
| 100 % | 12 in per ft |
Quick answers
Quick answers
- How many % is 1 in per ft?
- 1 in per ft is 8.33333 %.
- How many % is 10 in per ft?
- 10 in per ft is 83.3333 %.
The units
About these units
Roof pitch (in per ft)
Inches of rise per foot of run, the US roofing measure.
Percent grade (%)
Rise over run as a percentage, the measure on road signs.
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