Conversion guide

Kilowatts to Kilojoules conversion

Kilowatts to Kilojoules conversion. Exact conversion factors, worked examples, and privacy-first browser calculation on CalculatorX. Try it free.

Kilojoules to kilowatts Kilowatts to joules

Instant result

Result

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Enter values to convert.

Inputs —

Mode —

Formula —

Formulas

Core equations used by this converter.

FormulaE(kJ) = P(kW) × t(s)

iDC and resistive AC use PF = 1. Single-phase: multiply by PF. Three-phase line-to-line: include √3. Prefer RMS voltage and current for AC.

How to use

Enter power in kilowatts.

Enter the duration in seconds (or convert minutes/hours

Enter the duration in **seconds** (or convert minutes/hours to seconds).

Multiply: energy (kJ) = power × time.

Example conversions

Common values with formula and result.

3 kW for 3 seconds

3 × 3 = 9 kJ

9 kJ

2 kW for 60 seconds

2 × 60 = 120 kJ

120 kJ

1.5 kW for 10 minutes (600 s)

1.5 × 600 = 900 kJ

900 kJ

5 kW for 1 hour

5 × 3600 = 18 000 kJ

18 000 kJ

Kilowatts to Kilojoules conversion specification

Version 1.1.0 · Engine tested

Calculation status

Engine tested 4 published cases
Named expert review Not performed
Calculation version 1.1.0

Review policy

Definition: **Kilowatt (kW)** — unit of power (energy per time); 1 kW = 1000 W. **Kilojoule (kJ)** — unit of energy; 1 kJ = 1000 J.
What it calculates: Convert kilowatts (kW) to kilojoules (kJ). Energy E = P × t with t in seconds. Formula, steps, worked examples, and a quick chart.
Inputs: Values required by the selected conversion mode
Outputs: Converted result in the target unit or format
Formula: E(kJ) = P(kW) × t(s)
Kilowatts to kilojoules table (per second): Power (kW) Energy in 1 s (kJ) Energy in 1 h (kJ)
0.1 kW 0.1 kJ 360 kJ
0.5 kW 0.5 kJ 1800 kJ
1 kW 1 kJ 3600 kJ
2 kW 2 kJ 7200 kJ
3 kW 3 kJ 10 800 kJ
5 kW 5 kJ 18 000 kJ
10 kW 10 kJ 36 000 kJ
Assumptions: Conversion runs locally in the browser; values are not uploaded.
Uses the formulas documented on this page.
Units: Amps × Volts
Boundary conditions: Empty or invalid input yields no valid result.
Out-of-range values may be rejected by the tool runtime.
Example: 3 kW for 3 seconds → 9 kJ
Validation cases: 3 kW for 3 seconds → 9 kJ
2 kW for 60 seconds → 120 kJ
1.5 kW for 10 minutes (600 s) → 900 kJ
5 kW for 1 hour → 18 000 kJ
Sources: CalculatorX converter runtime
Standard unit / encoding definitions where applicable
Calculation version: 1.1.0

Power (kW)	Energy in 1 s (kJ)	Energy in 1 h (kJ)
0.1 kW	0.1 kJ	360 kJ
0.5 kW	0.5 kJ	1800 kJ
1 kW	1 kJ	3600 kJ
2 kW	2 kJ	7200 kJ
3 kW	3 kJ	10 800 kJ
5 kW	5 kJ	18 000 kJ
10 kW	10 kJ	36 000 kJ

Background

Interpretation and common distinctions.

Use the converter tabs to switch direction when available. Results for Kilowatts to Kilojoules conversion update locally in your browser.

Frequently asked questions

Key distinctions behind the conversion.

How do you convert using Kilowatts to Kilojoules conversion?

Use W = A × V. Example: 3 kW for 3 seconds → 9 kJ.

Can I switch direction?

Open the related reverse converter listed under Related tools.

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.