Obstacle Clearance Calculator | Departure Procedure

Clearance Analysis

Clearance Status

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Required Gradient -

Your Climb Gradient -

Gradient Margin -

Altitude at Obstacle -

Obstacle Clearance -

Requirement	Gradient
Standard IFR Departure	200 ft/nm
Obstacle Identification Surface	152 ft/nm (2.5%)
Required Obstacle Clearance	48 ft/nm above OIS
Minimum climb to 400 AGL	Before turning

Gradient (ft/nm) = (ROC x 60) / Ground Speed

Example: 500 fpm at 90 kt GS = (500 x 60) / 90 = 333 ft/nm