Conversion guide

Watts to Kilojoules conversion

Convert watts (W) to kilojoules (kJ). Formula E(kJ) = P(W) × t(s) ÷ 1000. Examples for seconds, minutes, and hours. Runs locally in your browser.

Kilojoules to watts Watts 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(W) × t(s) ÷ 1000

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 watts.

Enter duration in seconds.

Multiply, then divide by 1000.

Example conversions

Common values with formula and result.

1000 W for 3 s

1000 × 3 ÷ 1000 = 3 kJ

3 kJ

500 W for 10 s

500 × 10 ÷ 1000 = 5 kJ

5 kJ

100 W for 60 s

100 × 60 ÷ 1000 = 6 kJ

6 kJ

2000 W for 1 hour (3600 s)

2000 × 3600 ÷ 1000 = 7200 kJ

7200 kJ

Watts 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: **Watt (W)** — power. **Kilojoule (kJ)** — energy (1000 J).
What it calculates: Convert watts (W) to kilojoules (kJ). Formula E(kJ) = P(W) × t(s) ÷ 1000. Examples for seconds, minutes, and hours.
Inputs: Values required by the selected conversion mode
Outputs: Converted result in the target unit or format
Formula: E(kJ) = P(W) × t(s) ÷ 1000
Watts to kilojoules table: Power (W) Energy in 1 s (kJ) Energy in 1 min (kJ) Energy in 1 h (kJ)
100 W 0.1 6 360
500 W 0.5 30 1800
1000 W 1.0 60 3600
2000 W 2.0 120 7200
5000 W 5.0 300 18 000
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: 1000 W for 3 s → 3 kJ
Validation cases: 1000 W for 3 s → 3 kJ
500 W for 10 s → 5 kJ
100 W for 60 s → 6 kJ
2000 W for 1 hour (3600 s) → 7200 kJ
Sources: CalculatorX converter runtime
Standard unit / encoding definitions where applicable
Calculation version: 1.1.0

Power (W)	Energy in 1 s (kJ)	Energy in 1 min (kJ)	Energy in 1 h (kJ)
100 W	0.1	6	360
500 W	0.5	30	1800
1000 W	1.0	60	3600
2000 W	2.0	120	7200
5000 W	5.0	300	18 000

Background

Interpretation and common distinctions.

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

Frequently asked questions

Key distinctions behind the conversion.

How do you convert using Watts to Kilojoules conversion?

Use W = A × V. Example: 1000 W for 3 s → 3 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.