When to use this calculator
Calculate average power from work and elapsed time. This is an average over the specified interval.
Explore the force, energy & machines calculators for other questions in this topic. For a related calculation, use the Momentum Calculator: Calculate linear momentum from mass and velocity.
PUTTING IT INTO PRACTICE
Mechanical Power: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Work or energy (J) | 1,200 |
| Time (s) | 10 |
| Result | 120 W |
- Check the input labels and enter the example values above.
- Apply the relationship: Power = work ÷ time.
- The result is 120 W, rounded for display.
How to interpret your result
This is an average over the specified interval.
Distinguish net force from individual forces and specify the direction of displacement. Work can be negative. Force multiplication does not create extra energy because motion distance and losses also matter.
Frequently asked questions
Is mechanical advantage the same as efficiency?
No. Mechanical advantage compares forces; efficiency compares useful output energy or power with the corresponding input.
How do I use the mechanical power calculator?
Enter work or energy (j), time (s). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Power = work ÷ time.
What should I check before using the result?
This is an average over the specified interval.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
Further reading
For background on this topic, see OpenStax: work and energy ↗. This is a topic reference, not an external review or endorsement of this tool.
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