Enter the G-Force experienced and the radius of the turn into the calculator to determine the equivalent speed in miles per hour (MPH).

G-Force to MPH Formula

The following formula is used to convert G-Force to MPH.

MPH = sqrt(G * R) * 0.681818


  • G is the G-Force experienced
  • R is the radius of the turn in feet
  • MPH is the speed in miles per hour

To convert G-Force to MPH, take the square root of the product of the G-Force and the radius of the turn, then multiply by the conversion factor 0.681818 to get the speed in miles per hour.

What is G-Force?

G-Force, or gravitational force, is a measurement of the type of force per unit mass – typically acceleration – that causes a perception of weight, with 1 g being the force per unit mass due to gravity at the Earth’s surface (9.8 m/s^2 or 32.174 ft/s^2). In the context of circular motion, such as a vehicle taking a turn, G-Force can be felt as the centripetal force required to keep the vehicle in a curved path.

How to Calculate Speed from G-Force?

The following steps outline how to calculate the speed in MPH from G-Force.

  1. First, determine the G-Force experienced (G).
  2. Next, determine the radius of the turn (R) in feet.
  3. Use the formula from above: MPH = sqrt(G * R) * 0.681818.
  4. Finally, calculate the speed in MPH.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

G-Force experienced (G) = 2 g

Radius of the turn (R) = 100 feet