Reserve Fuel for a 9000km trip

[RarraMan]

Guys, How much trip fuel and reserve fuel should I load for a 9,000 km (4,900 nm) trip. Let's say my aircraft MTOW is around 230,000 kg (507,000 lb) . FL350.

After doing some maths I've estimated:

75,000 kg (165,300 lb) for Trip Fuel

10,800 kg (23,800 lb) for Reserve Fuel (10% time trip + 30 minutes holding at 1500ft at alternative airport)

So Total Fuel Weight = 85,800 kg (189,000 lb)

What do you think guys? Is this an accurate estimation?

[AerocatS2A]

I think it might depend on what aeroplane you are "flying".

[kenparry]

You seem to be using the wrong basis for your calculation. My airline days ended some years back, but the basis was this (probably still largely valid):

Minimum ramp fuel at departure is:
Allowance for start and taxi (200 kg for B757/767)
Calculated sector burn;
Plus 5% of the above as en-route contingency (can be reduced to 3% if an en-route alternate is specified within a defined geographic zone);
Plus 30 minutes holding at destination;
Plus fuel from go-around at destination to nominated alternate, using realistic route and altitude profile;
Plus final "emergency reserve fuel" (around 400 kg for B757/767 size aircraft).

[OhNoCB]

Yeah as above.

You seem to have missed fuel required to get to alternate.

Also depends on the aircraft but you can use 5 minutes holding fuel instead of 5% trip fuel for contingency which may be less.

[SOPS]

The first question is...what is the average fuel burn per hour for your 'aircraft'?