Calculate climb gradient in feet per nautical mile and percent using rate of climb and groundspeed. This free aviation calculator helps pilots with departure planning, obstacle awareness, and instrument training.
Enter rate of climb and groundspeed to estimate climb gradient in feet per nautical mile and percent.
This calculator estimates average climb gradient over the ground using rate of climb and groundspeed.
Climb gradient describes how much altitude an aircraft gains compared with the horizontal distance it travels. It is commonly expressed in feet per nautical mile or as a percent.
Unlike rate of climb, which is vertical speed in feet per minute, climb gradient shows how effectively the aircraft climbs over the ground. This is especially important for departure planning and obstacle clearance.
| Climb Gradient | Meaning |
|---|---|
| 200 ft/NM | Common standard IFR reference |
| 300 ft/NM | Higher required performance |
| 400+ ft/NM | Steeper climb requirement |
No. Rate of climb is vertical speed in feet per minute. Climb gradient compares altitude gained to horizontal distance traveled.
A higher groundspeed means the aircraft covers more ground while climbing. Even with the same feet per minute rate of climb, the climb gradient becomes shallower as groundspeed increases.
It is a commonly referenced baseline climb gradient for many IFR departure planning discussions, though specific procedures may require different performance.
No. This calculator is a planning aid. Pilots should always use approved aircraft performance data, published procedures, and current operational information.