Energy Converter

Convert joules, calories, kWh, and BTU.

Value

From

To

Converted—

⬅️ Back

🧭 About 🔒 Policy ✉ Contact

v1.2.460

Energy Converter

Energy unit conversion

Energy can be written as joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, or BTU. The best unit depends on whether you are reading physics notes, nutrition labels, batteries, utilities, or heating data.

Use this converter to compare battery capacity, appliance usage, nutrition values, heat output, and science examples. A kilowatt-hour is common for electricity bills, while joules are common in physics.

Do not confuse calories on food labels with small calories in physics contexts. Nutrition usually uses kilocalories, often written simply as Calories with a capital C.

Quick note

Related tools: Power Converter when you need energy per time instead of total energy.

🧭

About

Super Fast Tool is a focused collection of browser tools for calculations, conversions, generation, and file utilities.

Files and calculations are processed locally in your browser whenever possible. Learn more on the Privacy Policy page.

Privacy Policy

Most tool inputs and supported file operations are handled in your browser. Contact form submissions are sent through Formspree, and external services may process limited technical information.

Read the full Privacy Policy for cookies, advertising, local storage, and third-party service details.

Send feedback, bug reports, or calculator ideas.