Power Calculator
Power from work and time, P = W/t.
Amortization schedule
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Showing first 12 of months.
Growth over time
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Introduction
Power Calculator — Power from work and time, P = W/t. Enter Work (J), Time (s) to get an instant, accurate result.
Formula
Power is calculated as P = W / t, where W is the work done (or energy transferred) and t is the time taken. Power measures the rate at which work is performed.
Step-by-step
- Enter the Work (J).
- Enter the Time (s).
- Click Calculate to see your result instantly.
Real-world example
Example: With Work (J) = 100, Time (s) = 4, the Power Calculator gives Power W: 25.
Frequently Asked Questions
What is the difference between work and power?
Work measures the total energy transferred, while power measures how quickly that work is done — the same amount of work performed faster requires more power.
What units does power use?
Power is measured in watts (W), where one watt equals one joule per second. Larger amounts are often expressed in kilowatts (kW).
How is this related to horsepower?
One mechanical horsepower is equivalent to about 745.7 watts, so you can convert the result by dividing watts by 745.7.
What inputs does the Power Calculator need?
You'll need to provide: Work (J), Time (s). All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.
How accurate is the Power Calculator?
The Power Calculator applies the formula exactly as calculated — Power is calculated as P = W / t, where W is the work done (or energy transferred) and t is the time taken. Power measures the rate at which work is performed. — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.
Is the Power Calculator free to use?
Yes, the Power Calculator is completely free, requires no signup, and runs instantly in your browser.
About the Power Calculator
The Power Calculator uses a real, verifiable formula — Power is calculated as P = W / t, where W is the work done (or energy transferred) and t is the time taken. Power measures the rate at which work is performed. — so results are accurate every time, not an approximation.