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Calculate slope percent grade, angle in degrees, slope ratio, and actual slope length from rise and run. Includes ADA ramp compliance check and standard road grade classification for any terrain.
| Grade | Category | Application |
|---|---|---|
| 0-1% | Nearly flat | Highways, plains |
| 1-5% | Gentle | Suburban roads, cycling |
| 5-10% | Moderate | Hilly roads, hiking |
| 10-20% | Steep | Mountain roads |
| 20-35% | Very steep | Switchbacks |
| ADA ramp max | 8.33% (1:12) | Accessibility standard |
| Max US Interstate | 6% | 4% preferred for trucks |
| Standard railroad | 2.5% max | Cog railways up to 48% |
Cyclists rate hills: 0-3% easy, 3-6% moderate, 6-9% hard, 9-12% very hard, above 12% extreme. Sustainable hiking trail max: 10-15% with switchbacks above 10%. Famous climbs: Alpe d'Huez 8.1% average, Mont Ventoux 7.5%, Stelvio 7.4%. ADA wheelchair ramps max 8.33% (1:12). Drainage minimum: 0.5% on paved surfaces.
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