Inverse Square Law Calculator - Calculator Academy

Enter 3 of the following 4 values into the calculator; initial radiation intensity, final radiation intensity, initial distance, final distance. The calculator will solve for the missing value.

Inverse Square Law Formula

The following formula is used to calculate the values in an inverse square law.

I1 / I2 = d2^2 / d1^2

Where I1 is the initial radiation
I2 is the final radiation
D2 is the final distance
D1 is the initial distance

Inverse Square Law Definition

The inverse square law states that any physical quantity is proportional to the square of the distance from the source of the physical entity.

Inverse Square Law Example

How to calculate the inverse square law?

First, determine which variable is being solved for.
Determine which of the 4 variables above is missing.
Next, determine the value of the other variables.
For example, if solving for initial radiation, this would be final radiation, final distance and initial distance.
Finally, calculate the missing variable.
Calculate the missing value using the inverse square law equation.