Falcon Heavy can nominally do 64 tons to LEO, but it's volume constrained. It's really hard to fit more than 15-20 tons worth of useful cargo in the fairing.

Falcon Heavy can nominally do 64 tons to LEO, but it's volume constrained. It's really hard to fit more than 15-20 tons worth of useful cargo in the fairing. What the extra thrust is useful for is pushing 15 tons to beyond Earth orbit.