These do not have the same units. 1 kilowatt hour per meter cubed is in kg m-1 s-2 1 kilojoule per kg is in m2 s-2
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The answer is 0.001 kilojoules in a joule 1J = 0.001kJ
148 calories is 619.6 joules. Since one calorie = 4.18 joules then you multiply that number by 148 and you get 618.64 joules (619 rounded)
To convert calories to joules, you can use the conversion factor 1 calorie = 4.184 joules. Thus, a 255 calorie snack bar would contain 1065.42 joules (255 calories * 4.184 joules/calorie).
One foot-pound of force equates to about 1.355818 joules.
334.8 Joules