Top 9 · Updated October 2026

Lowest-Calorie Oat Bar

The 9 lightest oat bar products on this list range from 110 to 469 kcal per 100 g. The oat bar with the fewest calories per 100 g, so you can compare energy density at a glance. We checked 9 oat bar with complete data.

1

Oat Bar

freeyum honey apple

c 110 kcal 7 g sugar 2 g protein 4.5 g fat
2

Chewy cinnamon roll oat bars

Bites We Love

a NOVA 4 358 kcal 2.8 g sugar 8.6 g protein 14 g fat

Also: Palm oil free
3

Super foods gluten free oat bar

Happy for

c NOVA 4 360 kcal 28 g sugar 8 g protein 6 g fat
4

Salted Caramel Oaty Square

Stoats

b NOVA 4 363 kcal 14 g sugar 6.3 g protein 13 g fat
5

Chocolate Oat Bar

Once Upon A Farm

e NOVA 3 412 kcal 35.3 g sugar 2.9 g protein 23.5 g fat

Also: Palm oil free
6

Peanut Butter Chocolate Chip Oat Bite

Bobo's

e NOVA 4 432 kcal 24.3 g sugar 8.1 g protein 16.2 g fat

Also: Palm oil free
7

Flapjack Oat Bar Coconut

Fit Spo

d 446 kcal 26 g sugar 6.5 g protein 22 g fat

Also: Vegan · Vegetarian
8

Crunchy Oat Bars

Nairn's · 40 g

d NOVA 3 463 kcal 8 g sugar 7.7 g protein 19.1 g fat
9

Oat Bar Matcha radpberry

Naturally Pam

d NOVA 3 469 kcal 20 g sugar 11 g protein 27 g fat

Also: No additives

How we built this list

We ranked all published oat bar on Foodmetria that have a photo and the required nutrition data, using values per 100 g from the product label. Ties are broken by Nutri-Score and by how often shoppers scan the product. Rankings update automatically as label data changes. Read our methodology.

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