1.Theconversionratebetweenkilojoules(kJ)andkilocalories(kcal),alsoknownascalories,is1kJequalsapproximately0.2389kcal.2.Forinstance,837kJisequivalenttoabout199.9593kcal.3.Bothkilojoulesandkilocaloriesareunitsusedtomeasureheatenergy.Thekilocalorie,commonlyreferredtoasacalorie,isfrequentlyusedinnutritionandfitness.4.1calorieisequalto1000calories,anditisusedtorepresenttheheatenergycontentoffoodorfuel.Forexample,1kilogramofwaterabsorbingorreleasingheattochangeitstemperatureby1degreeCelsiusisequivalentto1kilocalorie.5.Thecalorie(cal)isacommonunitforassessingtheenergyvalueoffuels.Afuel'scalorificvalueisexpressedin"caloriesperkilogram"(Xcal/kg),indicatingtheamountofheatreleasedwhenacertainamountoffuelisburned.6.1calorieisequivalentto4.2joules.Inheatenergyunitconversions,1kilocalorieperkilogram(kcal/kg)isequalto4.1868kilojoules(kJ),whichisalsoequivalentto1caloriepergram.7.Thecalorieisanenergyunitdefinedastheamountofheatrequiredtoraisethetemperatureof1gramofwaterby1degreeCelsiusatstandardatmosphericpressure.Thecalorie(cal)iswidelyusedinnutritionalandfitnesscontexts.8.Kilojoules(kJ)aretheinternationalunitsformeasuringheatandworkandshouldnotbeconfusedwithkilograms(kg),whichisaunitofmass.Kilojoulesarecommonlyusedtomeasurethecaloriccontentoffoodandtheenergyexpenditureofphysicalactivity.