How many kJ is 15 kcal?
15 kcal = 62.76 kJ
It is 62.76 kJ, so saying 63 kJ is fine — rounding is within 0.5%.
And how many kcal is 15 kJ?
15 kJ = 3.59 kcal
Formula: kJ = kcal × 4.184
kcal to kJ around this value
6 kcal25.1kJ
7 kcal29.29kJ
8 kcal33.47kJ
9 kcal37.66kJ
10 kcal41.84kJ
11 kcal46.02kJ
12 kcal50.21kJ
13 kcal54.39kJ
14 kcal58.58kJ
15 kcal62.76kJ
16 kcal66.94kJ
17 kcal71.13kJ
18 kcal75.31kJ
19 kcal79.5kJ
20 kcal83.68kJ
21 kcal87.86kJ
22 kcal92.05kJ
23 kcal96.23kJ
24 kcal100.42kJ
25 kcal104.6kJ