Conversion guide

Watt-hours to Watts conversion

Calculate average power in W from energy in Wh and an explicit duration in hours. Runs locally in your browser.

Watts to watt-hours Watt-hours to kilowatts

Instant result

Result

—

Enter values to convert.

Inputs —

Mode —

Formula —

Formulas

Core equations used by this converter.

Average powerP(W) = E(Wh) ÷ Δt(h)

Exact definition1 W = 1 J/s

iAverage power is measured over the same interval as the energy. Displayed results may be rounded.

How to use

Enter energy

Use Wh for the first field.

Enter the duration

Use hours. The duration must be greater than zero.

Read the result

The result updates in W.

Example conversions

Common values with formula and result.

100 Wh over 2 hours

100 ÷ 2 = 50 W

50 W

500 Wh over 5 hours

500 ÷ 5 = 100 W

100 W

240 Wh over 24 hours

240 ÷ 24 = 10 W average

10 W average

50 Wh over 0.5 hours

50 ÷ 0.5 = 100 W

100 W

Watt-hours to Watts conversion specification

Version 1.1.1 · Engine tested

Calculation status

Engine tested 4 published cases
Named expert review Not performed
Calculation version 1.1.1

Review policy

Definition: Divide energy by the elapsed time to find average power. Use hours for the duration on this page.
What it calculates: Calculate average power in W from energy in Wh and an explicit duration in hours. Runs locally in your browser.
Inputs: Energy (Wh)
Duration (h)
Outputs: Average power (W)
Formula: P(W) = E(Wh) ÷ Δt(h)
Watt-hours to watts table: Energy (Wh) over 1 h over 5 h over 10 h
50 Wh 50 W 10 W 5 W
100 Wh 100 W 20 W 10 W
250 Wh 250 W 50 W 25 W
500 Wh 500 W 100 W 50 W
1000 Wh 1000 W 200 W 100 W
2000 Wh 2000 W 400 W 200 W
Assumptions: Average power is measured over the same interval as the energy.
Runs locally with pinned UUCE unit definitions.
Units: Wh
h
W
Boundary conditions: Empty or invalid input yields no valid result.
Energy must be nonnegative.
Duration must be greater than zero.
Example: 100 Wh over 2 hours → 50 W
Validation cases: 100 Wh over 2 hours → 50 W
500 Wh over 5 hours → 100 W
240 Wh over 24 hours → 10 W average
50 Wh over 0.5 hours → 100 W
Sources: NIST SP 330, Appendix 1 (https://www.nist.gov/pml/special-publication-330/sp-330-appendix-1)
NIST SP 330, Section 4 (https://www.nist.gov/pml/special-publication-330/sp-330-section-4)
CalculatorX UUCE snapshot 0.3.0-preview.3
Calculation version: 1.1.1

Energy (Wh)	over 1 h	over 5 h	over 10 h
50 Wh	50 W	10 W	5 W
100 Wh	100 W	20 W	10 W
250 Wh	250 W	50 W	25 W
500 Wh	500 W	100 W	50 W
1000 Wh	1000 W	200 W	100 W
2000 Wh	2000 W	400 W	200 W

Background

Interpretation and common distinctions.

Enter the duration in hours to calculate average power. Results for Watt-hours to Watts conversion update locally in your browser.

Frequently asked questions

Key distinctions behind the conversion.

How do you convert using Watt-hours to Watts conversion?

Divide energy by the elapsed time to find average power. Example: 100 Wh over 2 hours → 50 W.

Can I switch direction?

Open a related calculator to use a different input and output pair.

Does this run online or locally?

Calculation runs locally in your browser. Values are not uploaded.

How precise are the results?

Results follow the formulas on this page. Round to the precision your use case needs.