Skip to main content
Heading380
FL
Performance & Planning

Flight Duration Calculator

Time en route from distance and ground speed, with optional fuel required.

Inputs

/hr
/hr

Result

Time en route

2:00

2 hours

Total minutes

120min

Fuel required

At the entered hourly burn

60units

Formula

Ref
  • Time (hours) = distance ÷ ground speed
  • Fuel = time (hours) × fuel burn per hour

Worked example

Ref

240 nm leg at 120 kt ground speed, burning 30 units/hour.

  1. 1.Time = 240 ÷ 120 = 2.0 hours.
  2. 2.= 2:00 (H:MM).
  3. 3.Fuel = 2.0 × 30 = 60 units.

2:00 en route, 60 units of fuel required.

How it works

Ref

The distance–speed–time relationship underpins every flight plan and diversion decision. Feed it the ground speed (not TAS) so wind is already accounted for, and the estimated time en route and fuel needed follow directly.

DGCA student tip

Exam

In the exam, time in minutes = distance ÷ ground speed × 60. For 1 nm per minute you need a 60 kt ground speed — a useful anchor for quick estimates.

Common mistakes

Watch
  • Using true airspeed instead of ground speed, ignoring wind.
  • Mismatching units — nm with mph, or km with knots.
  • Reading 2.5 hours as 2 hours 50 minutes instead of 2:30.
← All flight tools