Kilocalories (food) to Kilojoules converter

About energy units

Energy's unit zoo exists because each field measured it before agreeing on the joule: food labels use kilocalories (confusingly printed as 'Calories'), electricity bills use kilowatt-hours, US heating equipment uses BTU, and chemistry uses the small calorie. Exact bridges: one food kilocalorie is 4,184 joules, one kilowatt-hour is 3.6 million joules (or 3,412 BTU). That means a 2,000 kcal daily diet is about 2.3 kWh, roughly what a fridge uses in a day.