Lowest calorie chocolate
One Ferrero Rocher is the lowest at 73 kcal, and of the full size bars a four finger KitKat is the lightest at 210 kcal.
Numbers for the portion shown, the same as on each food's page. Sports are for someone of about 70 kg.
Every number is for the portion people actually eat: one Ferrero, two truffles, four squares off a bar or one standard pack. So the top of this list is small portions, not light chocolate.
Per gram they are all close. Four squares (25 g) are 134 kcal of milk chocolate, 135 of Milka and 150 of dark, so dark is not the lighter pick, it just has a bit more fat.
A two finger KitKat is 105 and a fun size bag of M&M's is 70, which is the easy swap when you want the taste and not the whole bar. In Caltype you type it the way you would say it, "four squares of milka", and it is counted.
Questions
What is the lowest calorie chocolate bar?
Of the standard bars, a four finger KitKat at 210 kcal. A two finger KitKat is 105 and a fun size bar is 80.
Is dark chocolate lower in calories than milk chocolate?
No. Four squares of dark are 150 kcal against 134 for milk, and a 100 g bar is 600 against 535.
How many calories in a Snickers, a Twix and a Mars?
A Snickers is 245 kcal, a Twix pack 250 and a Mars 230. A Bounty pack is the highest of the bars at 280.
How many calories in a whole bar of chocolate?
A 100 g bar of milk chocolate is 535 kcal, a Milka bar 540 and a dark chocolate bar 600.