English 
Français 
Italiano 
Español 
Deutsch 
Rankings 
Tools 
Round converter
WaWBOCWWWIIVGBO6BO7
A round is not worth the same everywhere. On World at War, solo rounds stop getting harder long before the record; on Black Ops Cold War, Black Ops 6 and Black Ops 7, zombie health stops growing at round 55; on WWII and Vanguard it grows more slowly than in classic Zombies. ZFRR counts all of them against classic rounds for its ratings. Type a round, get its classic equivalent, or the other way round.
Reference rounds click one to load it
How the conversion works
World at War. In solo, Nacht der Untoten, Verrückt and Shi No Numa stop adding zombies, speed and spawn rate early, so a very high round is built from the same numbers as a lower one. Each World at War board is matched to the Black Ops board of the same room and the same player count: rounds up to three quarters of the Black Ops world record count as played, then the higher rounds are compressed so that the World at War world record lands on the Black Ops one. The result changes when either world record moves.
World at War: Rounds explains why.
Black Ops Cold War. Zombie health grows slowly, then stops for good at round 55, while classic Zombies adds 10% health every round. Up to round 51 a Cold War round counts as played; between 51 and 55 it counts as the classic round where zombies have the same health; past 55, every doubling of the round adds three classic rounds.
Black Ops Cold War: Rounds explains why.
WWII, Vanguard, Black Ops 6 and Black Ops 7. Each round counts as the classic round where zombies have the same health. On WWII health grows 8% a round instead of 10%; on Vanguard it climbs in small steps up to 7,500 at round 74; on Black Ops 6 and 7 it reaches 50,000 at round 55 and stops, so a round counts as played up to about 48, then past 55 every doubling adds three classic rounds.
How rounds work in every Zombies game explains why.