Calories, kilojoules, kilowatt-hours: decode every energy label.
The same energy speaks three languages: food labels count kilocalories in the US but kilojoules in Australia and much of Europe, electricity bills use kilowatt-hours, and physics uses joules. Confusing them misreads your diet and your utilities.
Below, every everyday energy converter — food, electricity, heat — with the exact factors (1 kcal = 4.184 kJ), the label-reading context, and why "calories" on food are actually kilocalories.
From food labels in kcal to Australian kilojoules and electricity bills in kWh, these converters translate every everyday energy unit. Each page gives the exact factor — 1 kcal = 4.184 kJ, 1 kWh = 3.6 million joules — plus the context: what a calorie really is, why your bill uses kWh, and how to compare what you eat with what you spend.
Are these converters really free? Yes — unlimited, no account, no paywall. CalculUnits is funded by non-intrusive ads only.
How accurate are the results? Every conversion uses the exact official factor from SI and NIST references, shown on each page so you can verify the math yourself.
Do my values leave my device? No — all calculations run in your browser. Nothing you type is ever sent anywhere.