Energy Converter
Convert energy between Joules, calories, kWh, BTU, and more.
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FAQs
What is the difference between a calorie and a Calorie (kilocalorie)?
A small calorie (cal) is the energy to raise 1 g of water by 1°C. A food Calorie (Cal, with capital C) or kilocalorie (kcal) is 1,000 small calories. Nutrition labels use kcal (often written as 'Calories'). When someone says a hamburger has 500 calories, they mean 500 kcal = 500,000 small calories.
What is a BTU?
BTU (British Thermal Unit) is the energy needed to raise 1 pound of water by 1°F. It is widely used in heating, ventilation, and air conditioning (HVAC) in the US. Air conditioner capacity is rated in BTU/hour. 1 BTU = 1,055 joules. A typical UK home might require 30,000–40,000 BTU/hour of heating capacity.
What is a kilowatt-hour in everyday terms?
One kilowatt-hour (kWh) is the energy consumed by a 1,000-watt appliance running for 1 hour. Examples: a 1 kW electric heater runs for 1 hour, a 100 W light bulb runs for 10 hours, a 200 W refrigerator runs for 5 hours. An average UK household uses about 8–10 kWh per day.