Energy Converters
Convert between scientific, electrical, thermal, and nutritional energy units including joules (J), kilojoules (kJ), watt-hours (Wh), kilowatt-hours (kWh), BTU, calories, and kilocalories.
Explanation
Energy conversions in this hub are normalized through joules (J) as the base reference. Exact electrical relationships include 1 Wh = 3600 J and 1 kWh = 3,600,000 J. Nutritional units distinguish calorie (cal) from kilocalorie (kcal), and BTU factors are derived from fixed thermal definitions. For clarity, energy conversions are grouped into scientific, electrical, thermal, and nutritional domains.
Frequently Asked Questions
What is the SI unit of energy?
The SI unit of energy is the joule (J).
How many joules are in 1 kWh?
Exactly 3,600,000 joules.
What is the difference between calorie and kilocalorie?
A kilocalorie equals 1000 calories, so 1 kcal = 1000 cal.
What does BTU measure?
BTU measures thermal energy and is commonly used in heating and HVAC contexts.
Are energy conversions multiplicative?
Yes. Energy conversions are purely multiplicative with no additive offsets.
How do I switch direction?
Use the switch button to navigate directly to the mirror page for the reverse conversion.