Lever Calculator

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The lever class determines where the fulcrum sits relative to the effort and load. Class 1 has MA that can be above or below 1. Class 2 always gives MA > 1 (force multiplication). Class 3 always gives MA < 1 (speed multiplication).
Choose the quantity you want to calculate; the remaining fields become your inputs.
The force you apply to the lever (the input force).
N
The force acting on the load (the resistance or output force).
N
Distance from the fulcrum to the point where effort is applied.
m
Distance from the fulcrum to the point where the load is applied.
m
Mechanical advantageForce multiplier (MA > 1)
4

Ratio of load force to effort force (MA = load / effort = effort arm / load arm)

Effort force50
Load force200
Effort arm2
Load arm0.5
Input torque (effort moment)100
Output torque (load moment)100
_forceUnitN
_armUnitm
4
Speed multiplier (MA < 1)<1Moderate advantage1-3Good advantage3-6High advantage6+

This lever multiplies your force 4.00 times.

  • With MA = 4.00, you only need to apply 25.0% of the load force to move the load.
  • Class 1 levers (seesaw, scissors, crowbar) place the fulcrum between effort and load and can achieve any MA depending on arm lengths.
  • You apply 50.0 N of effort to move a 200.0 N load.
  • Effort arm: 2.00 m, load arm: 0.50 m.

Next stepTo maximize force multiplication, increase the effort arm length or move the fulcrum closer to the load.

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