As found on the RAF website
CAPABILITY
Atlas (Atlas C.1 A400M) has the ability to carry a 37-tonne payload over 2,000nm to established and remote civilian and military airfields, and short unprepared or semi-prepared strips. Capable of operating at altitudes up to 40,000ft, Atlas also offers impressive low-level capability.
It will accommodate as many as 116 fully-equipped troops; vehicles; helicopters, including a Chinook; mixed loads, including nine aircraft pallets and 54 passengers, or combinations of vehicles, pallets and personnel,
(up to a payload of 37 tonnes)