Energy Converter
Convert between joules, calories, kilocalories, kWh, BTU, and electronvolts.
About this tool
Energy conversion is essential in physics, engineering, and everyday life—from calculating fuel efficiency to understanding power consumption on your utility bill. The Energy Converter eliminates the need for manual formula lookups by instantly converting between joules, calories, kilocalories, kWh, BTU, and electronvolts, making it indispensable for scientists, engineers, and students alike.
Simply enter a value in any energy unit and select your target unit to receive an instant, accurate conversion. This tool is perfect for those working with thermal data, electrical consumption, nutritional information, or scientific research where energy measurements are critical. Whether you're analyzing HVAC system efficiency, comparing food energy content in different units, or solving physics problems, the converter handles all conversions seamlessly.
The tool uses standard conversion factors recognized by the scientific community, ensuring accuracy across all six energy units. No registration or downloads are required—calculations happen instantly in your browser, making it convenient for quick reference or batch conversions whenever you need them.
Frequently Asked Questions
Code Implementation
# Energy conversions in Python
def joules_to_calories(j):
"""1 calorie = 4.184 joules"""
return j / 4.184
def calories_to_joules(cal):
return cal * 4.184
def joules_to_kwh(j):
"""1 kWh = 3,600,000 joules"""
return j / 3_600_000
def kwh_to_joules(kwh):
return kwh * 3_600_000
def joules_to_btu(j):
"""1 BTU = 1055.06 joules"""
return j / 1055.06
def kcal_to_kj(kcal):
return kcal * 4.184
# Examples
print(joules_to_calories(1000)) # 239.0 cal
print(calories_to_joules(1)) # 4.184 J
print(joules_to_kwh(3_600_000)) # 1.0 kWh
print(kcal_to_kj(100)) # 418.4 kJ (food energy)
print(joules_to_btu(1055.06)) # 1.0 BTUComments & Feedback
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