fuelcalculator2000 professional: FREEWARE!

http://homepage.swissonline.ch/ROYHAHMANN/

for the B757_200F inter carco it have a example of fuel-settings.

take theme for the exactly "tripfuel".

Fuelcalculator2000: With more changeable options.
Calculates the fuel and the average climbing rate automatically.
convert the wight to volume (lbs/t to gal)
It is exactly and easy to serve.
During impossible inputs funny remarks are displayed.
Must for long flights or the correct landing load.