I'm working on implant my own game system to Roll20 and I encouter a strange behavior when I reference a auto-calculate fields to another. I have two auto-c fields : attr_TankMass and attr_TankAgility. attr_TankMass is a sum of many fields accross the sheet, with this formula : @{TankHullMass}+@{TankEngineMass}+@{TankTurretMass}+@{TankGunMass}+((@{TankHullAmmo}*@{TankShellWeight})/1000)+((@{TankTurretAmmo}*@{TankShellWeight})/1000) attr_TankAgility is the result of the following formula : round(@{TankEnginePower}/@{TankMass}) With this input : attr_TankHullMass = 42.71
attr_TankEngineMass = 0.85
attr_TankTurretMass = 8.25
attr_TankGunMass = 2.05
attr_TankHullAmmo = 60
attr_TankTurretAmmo = 36
attr_TankShellWeight = 17.5
attr_TankEnginePower = 650 I got : attr_TankMass = 55.54
attr_TankAgility = 28 TankMass is correct, as expected. I'm a not a international famous mathematician but I'm pretty sure 650/55.54 is equal to 11.7. Not 28.