Enter the total power output (W,hp) and the total mass (lbs,kg) into the Calculator. The calculator will evaluate the Power To Mass Ratio. 

Power To Mass Ratio Formula

PMR = P / M


  • PMR is the Power To Mass Ratio (W/lb)
  • P is the total power output (W,hp)
  • M is the total mass (lbs,kg)

To calculate Power To Mass Ratio, divide the power output by the mass.

How to Calculate Power To Mass Ratio?

The following steps outline how to calculate the Power To Mass Ratio.

  1. First, determine the total power output (W,hp). 
  2. Next, determine the total mass (lbs,kg). 
  3. Next, gather the formula from above = PMR = P / M.
  4. Finally, calculate the Power To Mass Ratio.
  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.

total power output (W,hp) = 50

total mass (lbs,kg) = 40

Frequently Asked Questions (FAQ)

What is the significance of the Power to Mass Ratio in vehicles?

The Power to Mass Ratio (PMR) in vehicles is crucial for understanding their acceleration capabilities. A higher PMR usually indicates a vehicle can accelerate faster because it has more power relative to its weight.

Can the Power to Mass Ratio be applied to athletes?

Yes, the Power to Mass Ratio is also applicable to athletes, especially in sports like cycling or running, where the athlete’s power output in relation to their body mass can significantly impact performance.

How does the Power to Mass Ratio affect fuel efficiency in vehicles?

A vehicle with a high Power to Mass Ratio might not always be more fuel-efficient since it can generate more power, which might lead to higher fuel consumption. However, efficiency also depends on how the power is used and the vehicle’s design.

Is it better to have a higher or lower Power to Mass Ratio?

Whether a higher or lower Power to Mass Ratio is better depends on the context. For performance in sports or vehicles, a higher ratio is generally preferred for better acceleration and agility. However, in terms of fuel efficiency and sustainability, the optimal ratio may vary based on the specific goals and design considerations.