I think you are missing something
Exact figures? They don't exist till you've flown it but estimates and rules of thumb can be helpful.
Have a word with your engineering ops dept and they'll explain.
Figures for what BRW, Initial Climb to where, Temp?? Here is one variant of the 744. No noise restrictions, radical departure. [Doesn't happen, EVER].
Anyway try this. Climb to FL330. 'Valid' for BRW 340->400T.
Distance ~ (0.6BRW-110) ISA; (0.6BRW-105) ISA+10; (1.1BRW-245) ISA+20
Time~ (0.1BRW-20) ISA; (0.1BRW-19) ISA+10; (0.15BRW-30) ISA+20
Fuel~ (35BRW-5600) ISA; (35BRW-5200) ISA+10; (50BRW-9500) ISA+20
In case I have mistyped a first guess goes as follows. Say BRW = 386T. Estimates are then 122nm, 127nm, 180nm to T/C at FL330 at ISA, ISA+10, ISA+20 respectively.
Similarly time 19, 20, 28 mins respectively.
Fuel 7910kg, 8310kg, 9800kg which you can work out as being 2.05%, 2.15%, 2.54% of BRW respectively.
In general the smaller the aircraft the higher the %age BRW is burnt in climb but the gross figure naturally is smaller.