Energy Converter
Joule to calorie, kWh to Joule & more
Convert energy units instantly — Joule to calorie, calorie to Joule, kilowatt-hour to Joule, and electronvolt. Built for quick homework, physics and chemistry numericals and lab records.
Convert energy now — free
Free Energy Converter — Joule to calorie, kWh to Joule & more
Converting between energy units comes up constantly in physics and chemistry homework — turning a reaction's energy in calories into Joules for a formula, checking an electricity bill's kWh figure, or working through a numerical that mixes Joules, calories and electronvolts. This energy converter is built to make that instant, accurate, and free, with no signup, no app download and no ads getting in the way.
It covers the energy conversions people search for most: Joule to calorie, calorie to Joule, kWh to Joule, Joule to kWh and Joule to eV — plus kilojoule and kilocalorie, so you can move between the units used in physics, chemistry and everyday electricity billing in one place instead of hunting for a separate tool for each pair.
Every conversion uses standard SI conversion factors — the same values accepted in TN Board, CBSE, NEET and JEE numericals — so the result you get here is the exact figure examiners expect, not a rounded approximation. That makes this tool useful for more than just homework: chemistry students converting reaction enthalpies, physics students solving energy numericals under exam conditions, and anyone who needs a quick, reliable energy conversion can rely on the same formulas used in this converter.
Just pick your from and to units (or tap one of the popular conversion shortcuts above), type in your value, and the result updates instantly — no "convert" button to click, no page reload, no waiting.
← Back to all unit convertersEnergy conversion — common questions
Divide the value in Joules by 4.184. For example, 4.184 J ÷ 4.184 = 1 calorie.
Multiply the value in calories by 4.184. For example, 1 cal × 4.184 = 4.184 J.
Multiply the value in kWh by 3,600,000. For example, 1 kWh = 3,600,000 J.
Divide the value in Joules by 3,600,000. For example, 3,600,000 J ÷ 3,600,000 = 1 kWh.
1 Joule equals approximately 6.242 × 10¹⁸ electronvolts (eV). The electronvolt is commonly used to measure energy at the atomic and subatomic scale.
Yes — it uses standard SI conversion factors (the same values accepted in TN Board, CBSE, NEET and JEE numericals), so results match what's expected in exam answers.