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FDP Calculator is a tool that helps you planning Crew duties with accordance to Operators Flight Times and Duty Limitations.
As you can see in the screenshot, it takes the following values into consideration:
Basic duty is calculated for both Single Crew (if applicable) and Multi Crew. This includes reporting and post-flight duty times and is based on MAX FDP.
Latest time on blocks is the latest time allowed for Block On. This is Basic duty reduced by the check out time.