Electrical conversion

Joules to Kilowatts conversion

Calculate average power in kW from energy in J and an explicit duration in seconds. Runs locally in your browser.

Kilowatts to joules Joules to watts

Instant result

Result

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Enter values to convert.

Inputs —

Mode —

Formula —

Formulas

Core equations used by this converter.

Average powerP(kW) = E(J) ÷ (Δt(s) × 1000)

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 J for the first field.

Enter the duration

Use seconds. The duration must be greater than zero.

Read the result

The result updates in kW.

Example conversions

Common values with formula and result.

3 600 000 J over 60 s

kW = 3 600 000 ÷ (60 × 1000) = 60 kW

60 kW

1 000 000 J over 10 s

kW = 1 000 000 ÷ (10 × 1000) = 100 kW

100 kW

5000 J over 5 s

kW = 5000 ÷ (5 × 1000) = 1 kW

1 kW

Joules to Kilowatts conversion specification

Version 1.1.1 · Engine tested

Calculation status

Engine tested 3 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 seconds for the duration on this page.
What it calculates: Calculate average power in kW from energy in J and an explicit duration in seconds. Runs locally in your browser.
Inputs: Energy (J)
Duration (s)
Outputs: Average power (kW)
Formula: P(kW) = E(J) ÷ (Δt(s) × 1000)
Assumptions: Average power is measured over the same interval as the energy.
Runs locally with pinned UUCE unit definitions.
Units: J
s
kW
Boundary conditions: Empty or invalid input yields no valid result.
Energy must be nonnegative.
Duration must be greater than zero.
Example: 3 600 000 J over 60 s → 60 kW
Validation cases: 3 600 000 J over 60 s → 60 kW
1 000 000 J over 10 s → 100 kW
5000 J over 5 s → 1 kW
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

Background

Interpretation and common distinctions.

Enter the duration in seconds to calculate average power. Results for Joules to Kilowatts conversion update locally in your browser.

Frequently asked questions

Key distinctions behind the conversion.

How do you convert using Joules to Kilowatts conversion?

Divide energy by the elapsed time to find average power. Example: 3 600 000 J over 60 s → 60 kW.

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.