Mechanical Advantage Calculator

Analyze Lever Systems: Force vs. Speed Trade-off

Select Lever Class:

● Effort Arm (Muscle) 5 cm Distance from Axis to Muscle Attachment

● Resistance Arm (Load) 30 cm Distance from Axis to Weight

Mechanical Advantage (MA)

0.17

Speed & ROM Advantage

Fulcrum (Axis) Effort (Muscle) Resistance (Load)

🎓 Clinical Relevance:

• MA > 1 (2nd Class): Force Multiplier. Allows lifting heavy loads (e.g., bodyweight on toes) but with small Range of Motion.
• MA < 1 (3rd Class): Speed Multiplier. The muscle works at a disadvantage (needs more force than the weight), but gains massive Speed and Range of Motion. This is why Biceps can move the hand quickly!