Calculating based on the lifting force & length of application

T [N·m] = F x ℓ T : Torque [N·m] ℓ : Length from the fulcrum to the end [m] F : Lifting force at the lid end [N]

Example) Required torque for F: 2.0 N and ℓ: 0.5 m T = 2.0 x 0.5 = 1.0 N·m

Calculating based on the weight & gravity center of application

T [N·m] = m x g x ℓ T : Torque [N·m] m: Mass [kg] g: Gravitational acceleration is defined as 9.8 m/s2 ℓ: Length from the fulcrum to the gravity center [m]

Example) Required torque for m: 0.408 kg and ℓ: 0.25 m T = 0.408 x 9.8 x 0.25 = 1.0 N·m