# Lever Systems Formula Calculator

Calculator Instructions:

This calculator solves for any of the 4 items in the lever Equation Enter 3 out of 4 items that you know and press the button
Related Formulas:

F1x = F2(d - x)
Search Engine Shortcut Examples:

f1=10,f2=20,x=5
Enter 3 out of 4 below:
F1 x F2 d

Given F1 = 10, F21 = 20, Distance from F1 to fulcrum (x) = 5, calculate Lever Length (d)

The Lever Equation is as follows:
F1x = F2(d - x)

Multiply the right side of the equation out:
F1x = F2d - F2x

F1x + F2x = F2d - F2x + F2x

Cancelling F2x on the right side, we get:
F1x + F2x = F2d

Factor out x:
x(F1 + F2) = F2d

Divide each side of the equation by F2:
 x(F1 + F2) F2
 =
 F2d F2

Cancelling F2 on the right side, we get:
 d  = x(F1 + F2) F2

Plug in our numbers and simplify:
 d  = 5(10 + 20) 20

 d  = 5(30) 20

 x  = 150 20

Lever Length (d) = 7.5

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