What do you use to calorie count?

I've made a meal plan, just finishing off the minor details, but one thing I've found is, food labels seem to vary.

I can pick up two packs of Brown basmati rice from two different stores and the nutrition per 100g can be way off.
Same with chicken and Salmon. I assume their are variables from shop to shop, but sometimes the difference seem to much to ignore.

So do you use the labels or do you use a certain website.

Thanks

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