Convert between joules, calories, kilowatt-hours, and BTU — energy units used in laboratory work and engineering. Enter a value in any unit and all other fields update automatically, saving you from manual conversion calculations when following protocols or reporting results in different unit systems.

Conversion Formulas (Approximate)

• 1 Joule ≈ 0.239 calories
• 1 Joule ≈ 0.000948 BTU
• 1 Joule ≈ 2.78 x 10^-7 kilowatt-hours
• 1 kilojoule = 1000 joules
• 1 kilocalorie = 1000 calories

These are the approximate conversion factors used in the converter. Keep in mind that some conversions involve very small numbers, so the displayed values might be rounded.