There isn't a tool which will do exactly what you want: I don't think there's a difficulty in understanding what you want, it's just that there isn't anything which does exactly that, so people are suggesting tools which do something similar.
The best you can do simply is get the windows calculator app and EDDB together.
- use EDDB to find the best sale price currently catalogued.
- subtract the Galactic Average price (shown on the cargo reward - for Hydrogen Fuel, 113
- multiply the answer by the tonnes of cargo
This is the additional money you could make by transporting the cargo somewhere profitable and selling it.
(For anything other than Hydrogen Fuel and Limpets this number will be positive)
The best you can do simply is get the windows calculator app and EDDB together.
- use EDDB to find the best sale price currently catalogued.
- subtract the Galactic Average price (shown on the cargo reward - for Hydrogen Fuel, 113
- multiply the answer by the tonnes of cargo
This is the additional money you could make by transporting the cargo somewhere profitable and selling it.
(For anything other than Hydrogen Fuel and Limpets this number will be positive)