Flight Duty Period (FDP) Calculator
Calculate Duty Period and Flight Duty Period (FDP) based on your Report Time and Debrief Time instantly.
Input & Settings
Active EntryDuty Breakdown
Awaiting InputEnter Off-Block & On-Block Times
Enter times in 24-hour 4-digit format (e.g., 0830 and 1415) to calculate your FDP and Duty Period.
Calculate Your Flight Duty Period
Calculate FDP and total duty time in just a few steps.
Enter Flight Times
Enter your Off-Block and On-Block times in the 24-hour format.
Set Your Offsets
Adjust Report and Debrief offsets to match your airline's procedures.
View Your Results
Instantly see your Flight Duty Period, Total Duty Period, and corresponding start and end times.
Example Calculation
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Frequently Asked Questions
Everything you need to know about duty time calculations and airline offset rules.
What is Flight Duty Period (FDP)?
Flight Duty Period (FDP) is the period during which a flight crew member is required to report for duty and operate one or more flights. Its start and end are defined by the applicable aviation regulations. It is different from the broader duty period, which may also include duties performed before or after the FDP.
How does Avion Calc handle midnight crossings?
Avion Calc automatically handles flights that cross midnight. For example, if Off-Block is 22:30 and On-Block is 04:15, the calculator treats the arrival as occurring on the following day and calculates a duration of 5 hours and 45 minutes.
Can I customize the report and debrief time offsets?
Yes. Use the report and debrief controls to adjust the time before Off-Block and after On-Block. This lets you configure the calculator around your airline's operational procedures.
Is this FDP calculator free to use?
Yes. The online FDP calculator is free to use directly in your browser. For offline calculations and additional flight time and time arithmetic tools, you can also download Avion Calc for iOS and Android.
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