Enter the velocity of impact and the stopping distance of impact into the calculator to determine the number of G forces experience during impact.

Impact G Force Formula

The following equation is used to calculate the Impact G Force.

IGF = [1/2*v^2 / d ] /9.81

  • Where IGF is the number of g-forces experienced during impact
  • d is the total distance traveled during impact (m)
  • v is the velocity of impact (m)

What is an Impact G Force?


An impact G force is the number of units of acceleration experienced during an impact relative to the acceleration due to gravity on Earth.

In other words, this is the acceleration during impact divided by 9.81 meters per second squared.

How to Calculate Impact G Force?

Example Problem:

The following example outlines the steps and information needed to calculate the Impact G Force.

First, determine the velocity at impact. In this example, the velocity at impact is 45 m/s.

Next, determine the total distance of the impact. In this case, the impact distance was 1.25 m.

Finally, calculate the number of g forces during impact using the formula above:

IGF = [1/2*v^2 / d ] /9.81

IGF = [1/2*45^2 / 1.25 ] /9.81

IGF = 82.56 Gs