Flight Planning
Fuel Burn Calculator
Work out the hourly fuel burn rate from fuel used over a known time.
Inputs
units
min
Result
Fuel burn rate
60units/hr
90 units over 1:30
Per minute
1units/min
Burn rate 60 units/hr (1 per min)
Formula
Ref- Burn per hour = (fuel used ÷ minutes) × 60
- Burn per minute = fuel used ÷ minutes
Worked example
RefUsed 90 units over 1 hour 30 minutes.
- 1.Time = 90 minutes.
- 2.Rate = (90 ÷ 90) × 60 = 60 units/hr.
Fuel burn rate = 60 units/hr.
How it works
RefWorking out the actual hourly burn from a known quantity of fuel over a known time lets you check the aircraft against its book figures and refine your planning burn. It's the inverse of fuel planning — measure what you used, get the rate.
DGCA student tip
ExamAlways convert time to a consistent unit first. A common exam slip is dividing by hours when the time is given in minutes (or vice-versa) — 90 units in 90 minutes is 60/hr, not 90/hr.
Common mistakes
Watch- Dividing by minutes but reporting the answer as per hour without ×60.
- Mixing the fuel unit between measurement and planning.
- Ignoring that climb burn is higher than cruise burn.