HomeCalculatorsPhysicskWh to Joules Converter
Physics calculator

kWh to Joules Converter

Convert energy between kilowatt-hours and joules (1 kWh = 3.6 MJ). Runs locally in your browser.

Instant result
Result
—

Enter values to calculate.

Inputs—
Mode—
Formula—
Trust summary CVP VERIFIED · CVP protocol 1.0.0-proposed · Engineering assurance
Input interpretation
Enter values to calculate.
Result
—
Assurance
Engineering
Declared partition coverage
PASS · 2/2 declared partitions (kwh-joule, invalid-domain) · Matrix
Known limitations
  • Energy unit conversion
  • Core CVP does not include live graph, viewport, or pointer interaction.
Model
kWh ↔ Joule conversion.
Scope
Exact SI
Verification
Engine tested · Source checked · v1.0.0 · CVP VERIFIED · CVP protocol 1.0.0-proposed · Engineering assurance· View Manifest · CVP overview · Specification
Versions
Calculation 1.0.0 · CVP protocol 1.0.0-proposed
CVP identity
1/1 property · digest 47e60dc69f1c
Legacy regression
3/3 tests · Production surface contract 4/4
Reference
O1 model · O2 expected_values · O2 numerical_behavior
Interfaces
PASS · UI (SSR) / REST / MCP — ui-ssr is query-result HTML, not a live browser session.
Supplemental domain review
Internal · Pass
Named expert review
Not performed
CVP suite
1/1 golden · 1/1 CVP boundary · 1/1 invalid · 1/1 property · 1/1 cross-interface · 1/1 CVP contract · Manifest
Sources
  • SI brochure — derived units
  • NIST / SI energy units — kilowatt-hour
Sources
Evidence
1 legacy golden · 1 legacy boundary · legacy regression suite · 1/1 oracle-backed golden · 1/1 invalid · Artifact integrity PASS · CalculatorX physics review
This calculator CURRENT · Public schema 1.0.0 matches · Semantic contract ✓ · Production attested · Public/cache ✓ · Origin ✓
Semantic contract
PASS
Full verification

Manifest identity, reference classes, interfaces, suite, and production records.

Formulas

Core equations used by this calculator.

kWh → JJ = kWh · 3.6×10⁶
J → kWhkWh = J / 3.6×10⁶
iSI exact factor.

How to use

1

Choose kWh → J or J → kWh

Pick the conversion direction.

2

Enter the energy value

Energy must be greater than zero for a meaningful conversion.

3

Read the result

1 kWh = 3.6×10⁶ J exactly in this tool.

Example calculations

Common configurations with formula and result.

ϟ

1 kWh

exact

1·3.6e6
3600000 J

kWh to Joules converter specification

Version 1.0.0 · Engine tested · Supplemental domain review · Internal · 2026-08-09

Calculation status

Review policy · Evidence · Reviewed by CalculatorX physics review

Definition
1 kWh = 3.6×10⁶ J exactly.
What it calculates
kWh ↔ Joule conversion.
Inputs
  • mode kwh-j|j-kwh
  • value
Outputs
  • J or kWh number
Formula
J=kWh·3.6e6
Assumptions
  • Exact SI
Units
  • kWh, J
Boundary conditions
  • value≤0 → VALUE_MUST_BE_POSITIVE
Example
1 kWh → 3.6e6 J
Validation cases

1 published on this page · 3/3 tests · Production surface contract 4/4 · View evidence

  • kwh-j value=1 → 3600000
Sources
  • SI brochure — derived units
    Supports: 1 kWh = 3.6 MJ
  • NIST / SI energy units — kilowatt-hour
    Supports: 1 kWh = 3.6×10⁶ J
Last reviewed
2026-08-09
Reviewed by
CalculatorX physics review
Calculation version
1.0.0

Background

Interpretation and common distinctions.

Convert kWh ↔ Joule with Trusted Template guards.

Supported and not supported

Supported — Bidirectional kWh↔J · API units.energy.kwh_joule

Not supported — BTU, calorie (use other converters)

Agent / API notes

Capability id: units.energy.kwh_joule · tool id: kwh-joule · pin 1.0.0.

Other calculators in this family: Watt ↔ HP, Specific Heat .

P Watt ↔ HP › c Specific Heat ›
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Frequently asked questions

Key distinctions behind the calculation.

Can energy be zero or negative?

No. The API returns VALUE_MUST_BE_POSITIVE.