Energy Conversion Calculator

Advanced Energy Conversion Calculator

Energy Conversion Calculator

Convert between different energy units with precision

Energy Conversion

Energy Conversion Facts:

  • 1 kWh = 3.6 million joules
  • 1 food Calorie (kcal) = 4.184 kJ
  • 1 BTU ≈ 1055 joules
  • 1 eV = 1.602×10⁻¹⁹ J
  • 1 keV = 1,000 eV
  • 1 MeV = 1,000,000 eV
  • 1 GeV = 1,000,000,000 eV

Conversion Results

1 kcal = 0.001163 kWh
Unit Value Equivalent To
Joules 4,184.00 1 kcal
BTUs 3.97 1 kcal
Foot-pounds 3,088.03 1 kcal

In Joules

4,184.00 J

In Calories

1,000.00 cal

In BTUs

3.97 BTU

In kWh

0.001163 kWh

In Electronvolts

2.611e+22 eV

Energy Equivalents:

1 gallon of gasoline ≈ 31,000 kcal

1 ton TNT ≈ 1 billion calories




An Energy Conversion Calculator is a tool designed to convert energy values between different units, such as joules (J), kilowatt-hours (kWh), calories (cal), British Thermal Units (BTU), and more. It is essential in fields like physics, engineering, nutrition, and energy management, where accurate energy unit conversions are required. 

Key Energy Units & Their Conversions 


Energy is the capacity to do work, and it can be measured in various units depending on the application. 


1. International System (SI) Units 

Joule (J) 

  • The SI unit of energy. 
  • 1 J = 1 Newton-meter (N·m) = 1 watt-second (W·s). 
  • Used in physics, engineering, and scientific calculations. 

Kilojoule (kJ) 

  • 1 kJ = 1,000 J. 
  • Common in food energy measurements and mechanical work. 

2. Electrical Energy Units 


Watt-hour (Wh) & Kilowatt-hour (kWh) 

  • 1 Wh = 3,600 J (since 1 W = 1 J/s). 
  • 1 kWh = 3.6 × 10⁶ J = 3.6 MJ. 
  • Used in electricity billing (household & industrial consumption). 

3. Thermal Energy Units 


Calorie (cal) & Kilocalorie (kcal) 

  • 1 cal ≈ 4.184 J (thermochemical calorie). 
  • 1 kcal (food calorie) = 1,000 cal ≈ 4,184 J. 
  • Used in nutrition and chemistry. 

British Thermal Unit (BTU) 

  • 1 BTU ≈ 1,055 J. 
  • Common in HVAC (heating, ventilation, air conditioning) and fuel energy content. 

4. Mechanical & Imperial Units 

Foot-pound (ft-lb) 

  • 1 ft-lb ≈ 1.356 J. 
  • Used in mechanical engineering (torque and work). 
Electronvolt (eV) 

  • 1 eV ≈ 1.602 × 10⁻¹⁹ J. 
  • Used in atomic and particle physics. 

5. Other Energy  Units 

Therm (thm) 
  • 1 thm = 100,000 BTU ≈ 105.5 MJ. 
  • Used in natural gas energy measurements. 

Ton of TNT (tTNT) 

  • 1 tTNT = 4.184 × 10⁹ J. 
  • Used in explosive energy comparisons. 

Conversion Calculation:

The calculator applies the appropriate conversion factor.

 Example: 

                                   5   kWh = 5 × 3.6 × 10 6   J = 18 , 000 , 000   J 

                             18 , 000 , 000   J ÷ 1 , 055   (J/BTU) ≈ 17 , 060   BTU 


Result Display:

Output: 5 kWh ≈ 17,060 BTU.