Unit Converters Cluster

Energy Converter (Joules, Calories, KWh, BTU & eV)

Convert energy and work between Joules, kilowatt-hours, calories, British Thermal Units, and electronvolts.

TL;DR: Energy Converter provides bidirectional thermodynamic conversions between Joules, Kilojoules, Calories, food Kilocalories (kcal), Kilowatt-hours (kWh), BTU, and Electronvolts.

How Do You Convert Kilowatt-Hours (kWh) to Joules and BTU?

1 kilowatt-hour (kWh) equals exactly 3,600,000 Joules (3.6 MJ) and 3,412.14 British Thermal Units (BTU): Joules = kWh × 3,600,000; BTU = kWh × 3,412.14. 1 food calorie (kcal) equals 4,184 Joules (4.184 kJ).

How to Use the Energy Converter

Our Energy Converter performs high-precision mathematical operations directly in your browser with zero latency and complete client-side privacy.

  1. Enter the numerical energy value.
  2. Select your source energy unit (e.g., Joules, Kilojoules, Calories, kWh, BTU, eV).
  3. Select your output target unit.
  4. Review the converted thermodynamic and mechanical work values.
  5. Copy values for utility bill calculations, nutrition science, or physics problem sets.

Mathematical Formula & Equations

Converts energy and work across Joules, Kilojoules, Calories, Kilocalories (dietary), BTUs, Watt-hours, and Kilowatt-hours.

\[ 1 \text{ Joule} = 0.000239006 \text{ kcal} = 0.000947817 \text{ BTU} = 2.77778 \times 10^{-7} \text{ kWh} = 0.737562 \text{ ft}\cdot\text{lb} \]

Calculation Example

2,000 dietary calories (kcal) = 8,368 Kilojoules (kJ) = 2.326 kWh.

100% Client-Side Privacy & Data Security

All calculations, amortization schedules, variables, and sensitive numerical datasets execute 100% locally in your web browser memory. Your financial, medical, and personal values are never transmitted, logged, or uploaded to any external server.

Frequently Asked Questions

There are exactly 4.184 Joules in 1 thermochemical calorie (1 cal = 4.184 J). One dietary nutritional calorie (kcal or Calorie) is 1,000 small calories or 4,184 Joules.
Multiply kWh by 3.6 million: `Joules = kWh × 3,600,000`. For example, 10 kWh equals 36,000,000 Joules (36 MJ).
There are approximately 3,412.14 British Thermal Units (BTU) in 1 kilowatt-hour (1 BTU ≈ 1,055.06 Joules).
An electronvolt is the amount of kinetic energy gained by an electron accelerating through an electric potential of one volt, equal to 1.602176634 × 10^-19 Joules.
1 Joule equals approximately 0.737562 foot-pounds (ft-lb) of mechanical work.
1 kWh equals 3,600,000 Joules. 1 dietary food calorie (kcal) equals 4,184 Joules.

Cite This Calculator

Need to reference this online calculator in a financial proposal, academic paper, blog post, or classroom curriculum? Copy a citation below.

NexLove.org. (2026). Energy Converter [Online Calculation Tool]. https://nexlove.org/tools/energy-converter
“Energy Converter.” NexLove.org, 2026, nexlove.org/tools/energy-converter.
NexLove.org (2026) Energy Converter. Available at: https://nexlove.org/tools/energy-converter (Accessed: 2026).
@misc{nexlove_energy_converter,
  title = {Energy Converter},
  author = {{NexLove.org}},
  year = {2026},
  url = {https://nexlove.org/tools/energy-converter}
}

Embed This Tool

Add the live Energy Converter to your own website with this snippet — it loads the real, working calculator in an iframe.

<iframe src="https://nexlove.org/embed/energy-converter.html" width="100%" height="600" style="border:1px solid #e2e8f0;border-radius:12px" title="Energy Converter — NexLove.org" loading="lazy"></iframe>

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