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Unit converters · Electricity

Energy converter

Convert energy between joules, calories, watt-hours, BTU, electron-volts, and dozens more units.

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How it works

Two steps, no account

1

Pick your units

SI joules and multiples, electrical (kWh), thermal (BTU, therm), nutritional calories, or atomic-scale units.

2

Enter a value

The result updates instantly as you type, or as soon as you change either unit.

FAQ

Common questions

Is my data sent anywhere?
No. The conversion runs entirely in your browser — nothing is transmitted, logged, or stored.
Is a food "Calorie" the same as a physics calorie?
No — a nutritional "Calorie" (capital C, listed as "Calorie (nutritional)" here) is actually a kilocalorie: 1,000 small calories. This converter keeps them as separate units so you don't accidentally convert food energy off by a factor of 1,000.
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Energy Converter

Our Energy Converter helps you convert between different units of energy. Convert between joules, calories, kilowatt-hours, BTUs, and many other energy measurements with precision.

How to Use the Converter

1. Enter Value

  • Input your energy value
  • Select source unit
  • Choose target unit
  • View instant conversion

2. Available Units

Common Units

  • Joule (J)
  • Kilojoule (kJ)
  • Kilowatt-hour (kW⋅h)
  • Calorie (nutritional)
  • BTU (British Thermal Unit)

Scientific Units

  • Electron-volt (eV)
  • Erg
  • Newton-meter (N⋅m)
  • Hartree energy
  • Rydberg constant

Industrial Units

  • Horsepower hour
  • Therm
  • Fuel oil equivalent
  • Ton-hour (refrigeration)
  • Megawatt-hour (MW⋅h)

Key Features

Conversion Options

  • 50+ energy units
  • Scientific notation
  • Precise calculations
  • Common conversions

Unit Categories

  1. SI Units

    • Joules and derivatives
    • Power-time units
    • Force-distance units
  2. Imperial/US Units

    • BTUs
    • Foot-pounds
    • Therms
  3. Scientific Units

    • Atomic units
    • Quantum measurements
    • Research standards

Use Cases

1. Engineering

  • Power calculations
  • Energy efficiency
  • System design
  • Performance analysis

2. Scientific Research

  • Physics calculations
  • Chemical reactions
  • Quantum mechanics
  • Thermodynamics

3. Industrial Applications

  • Power generation
  • HVAC systems
  • Fuel consumption
  • Energy auditing

Technical Features

  • Precision: High accuracy calculations
  • Real-Time: Instant conversions
  • Copy Function: Easy result sharing
  • Mobile Responsive: Works on all devices

Why Use Our Converter

1. Comprehensive Coverage

  • Multiple unit systems
  • Specialized units
  • Common conversions
  • Rare measurements

2. User-Friendly Design

  • Clear interface
  • Easy selection
  • Instant results
  • Copy functionality

3. Professional Accuracy

  • Precise calculations
  • Scientific notation
  • Standard compliance
  • Reliable results

Understanding Energy Units

Common Applications

  1. Power Generation

    • Electricity production
    • Fuel consumption
    • Grid calculations
  2. Scientific Research

    • Laboratory work
    • Experimental design
    • Data analysis
  3. Industrial Use

    • Process efficiency
    • System design
    • Energy auditing

Best Practices

  1. Unit Selection: Choose appropriate units
  2. Precision: Maintain significant figures
  3. Verification: Double-check conversions
  4. Documentation: Record calculations

Remember: Accurate energy conversions are crucial for engineering, scientific, and industrial applications.