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Well, a 12 year old should eat 1,200 or more calories a day depending on how active you are. If you are more active you should eat more calories. If you convert 1,200 calories into kilojoules it would be 5021kj. Hoped it helped

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Wiki User

11y ago
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Wiki User

15y ago

Children under 18- 1000 - girls 1500 - boys

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Wiki User

12y ago

It matters on the height and weight.

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Wiki User

12y ago

12000

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Esther Garcia

Lvl 2
4y ago

I don’t know

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Q: How many kilojoules should a 12 year old have dailey?
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a boy on average should eat around 2200 kilojoules a day. a girl on average should eat around 2100 kilojoules a day. on average a 13 year old should eat 2150 kilojoules a day.


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