Enter the force (N) and the velocity (m/s) into the Calculator. The calculator will evaluate the Speed To Watts. 

Speed To Watts Calculator

Pick a scenario and enter your numbers.

Force × Speed
Cycling Estimate
Lifting Load

Speed To Watts Formula

P = F*V

Variables:

  • P is the Speed To Watts (watts)
  • F is the force (N)
  • V is the velocity (m/s)

To convert speed to watts, multiply the force by the velocity.

Speed (km/h) to Power (Watts) Conversion Table at Force = 100 N
Speed (km/h) Power (W)
127.778
255.556
383.333
4111.111
5138.889
6166.667
8222.222
10277.778
12333.333
15416.667
18500.000
20555.556
25694.444
30833.333
35972.222
401111.111
451250.000
501388.889
601666.667
802222.222
Formula: P = F × v. Assumes constant force F = 100 N and v = speed × 0.277778 (m/s). Thus, 1 km/h ≈ 27.7778 W at 100 N.

How to Calculate Speed To Watts?

The following steps outline how to calculate the Speed To Watts.


  1. First, determine the force (N). 
  2. Next, determine the velocity (m/s). 
  3. Next, gather the formula from above = P = F*V.
  4. Finally, calculate the Speed To Watts.
  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.

force (N) = 4.5

velocity (m/s) = 6.756

Frequently Asked Questions

What is the significance of converting speed to watts?

Converting speed to watts is significant in understanding the power output or energy conversion rate in a system, particularly in mechanical and electrical engineering applications. It helps in assessing the efficiency of machines and devices that convert kinetic energy into electrical energy.

Can this formula be used for any type of motion?

Yes, the formula P = F*V can be applied to any linear motion where a constant force is applied in the direction of the velocity. However, for rotational motion or situations where the force is not constant or not in the direction of motion, a different approach or formula might be necessary.

Are there any limitations to using the Speed to Watts calculator?

The primary limitation is the assumption of constant force and velocity in the direction of motion. Real-world applications often involve variable forces and velocities, as well as losses due to friction, air resistance, and inefficiencies in energy conversion which are not accounted for in this simple calculation.

How can I increase the accuracy of my Speed to Watts calculations?

To increase accuracy, ensure that your force and velocity measurements are as precise as possible. For more complex systems, consider factors such as friction, air resistance, and mechanical inefficiencies. Using a more detailed model or simulation might be necessary for highly accurate predictions.