I've recently completed an Excel spreadsheet Fuel Planner.What it does:Calculates Approx. Fuel Burn based on trip length, head wind component, and Planned landing weight.Force user to stay under structural weight limitsWarn user when trying to go beyond range (either by stating out of range in extreme cases, or by telling you that you need more fuel than you can carry)What it doesn't do:Enforce Reduced Maximum Weight due to Takeoff ConditionsAny form of loading the actual aircraftGaurantee PRECISE numbers. These are designed to be ballpark figures for confirmation using the FMCIf you would like it, it's attached below.http://forums.avsim.net/user_files/159928.zip-Brian

A note: The Planner is based on the PMDG manuals and tends to err on the side of too much fuel (by maybe 2-3k pounds at worst)-Brian