Convert energy instantly — type a value, pick your units, and every other common unit updates live below. 100% free, runs entirely in your browser, no sign-up.
Every unit below updates live from the value you enter in the "From" field above.
The "Calorie" on a nutrition label is actually a kilocalorie (1,000 small calories) — a quirk of food-labeling history that trips people up constantly, so this converter labels it explicitly as Kilocalorie. Kilowatt-hours show up on electricity bills, joules and kilojoules dominate in physics and (outside the US) on nutrition labels, and BTU is still standard for rating air conditioners and furnaces in the US.
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