Mechanical Advantage of A Lever Calculator

Calculate mechanical advantage of any lever with our free online tool. Fast and easy, get the advantage you need in seconds!

Mechanical advantage is a measure of the amount of energy saved by using tools or mechanical devices. In other words, it is the benefit gained when a mechanical system is employed to transmit force. The lever is one of the most widely used simple tools that provides mechanical advantage. This online tool can be used to calculate the mechanical advantage of the three different classes of levers.

Effort Arm
Load Arm
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    4 Number of calculations

    Mechanical Advantage of First Class Lever

    MA = \frac{d_1}{d_2}

    Mechanical Advantage of Second Class Lever

    MA = \frac{d_1}{d_2}

    Mechanical Advantage of Third Class Lever

    MA = \frac{d_2}{d_1}


    • MA = Mechanical Advantage
    • d1 = Effort Arm
    • d2 = Load Arm

    Levers are classified according to the position of the fulcrum, input and output forces. A first class lever has the fulcrum in the middle and the effort applied on one side and the load on the other. A second class lever has the load in between the effort and the fulcrum. A third class lever has the effort in between the load and the fulcrum.

    For example, if the effort arm is 5 and the load arm is 7, then the mechanical advantage of a first or second class lever is 5/7 = 0.7143, while the mechanical advantage of a third class lever is 7/5 = 1.4.