Best Protein Bars UK 2026

Updated October 2026 · 124 protein bars ranked

We scored every protein bar sold in the UK on one public formula — how much of its calories come from protein. No sponsored placements, no black-box scores. Here are the bars that give you the most protein per calorie.

Our top 3 picks

Premier Protein High Protein Bar 50% Crispy Peach 40g

Premier Protein

100A

Protein: 50 g/100g
Calories: 350 kcal
kcal / 1 g: 7.0

Premier Protein High Protein Bar 50% Crispy Cookie 40g

Premier Protein

100A

Protein: 50 g/100g
Calories: 346 kcal
kcal / 1 g: 6.9

Premier Protein High Protein Bar 50% Double Chocolate Cookie 40g

Premier Protein

100A

Protein: 50 g/100g
Calories: 339 kcal
kcal / 1 g: 6.8

Full ranking — top 10

#	Product	Protein /100g	Kcal /100g	Score	Grade
1	Premier Protein High Protein Bar 50% Crispy Peach 40gPremier Protein	50g	350	100	100A
2	Premier Protein High Protein Bar 50% Crispy Cookie 40gPremier Protein	50g	346	100	100A
3	Premier Protein High Protein Bar 50% Double Chocolate Cookie 40gPremier Protein	50g	339	100	100A
4	Premier Protein High Protein Bar 50% Chocolate Caramel 40gPremier Protein	50g	337	100	100A
5	MyProtein Lean Protein Bar White Chocolate & Raspberry 12 x 45gMyProtein	40g	338	95	95A
6	Premier Protein Protein Bar Deluxe 40% Chocolate Brownie 50gPremier Protein	40g	358	89	89A
7	Premier Protein Protein Bar Deluxe 40% White Chocolate Vanilla 50gPremier Protein	40g	367	87	87A
8	Premier Protein Protein Bar Deluxe 40% Chocolate Peanut Butter 50gPremier Protein	40g	372	86	86A
9	Barebells Cookies & CreamBarebells	37g	346	86	86A
10	X-Tone Protein Bar 45g - Cookies & Cream x16X-Tone	34g	316	86	86A

Browse all 124 protein bars →

How we rank

Every protein bar is scored 0–100 on the share of its calories that come from protein — the same public formula across the whole site. Rankings update automatically as new products are verified. Read the full methodology →

Frequently asked

What is the highest-protein protein bar in the UK?

By protein-per-calorie efficiency, the Premier Protein High Protein Bar 50% Crispy Peach 40g by Premier Protein currently leads our ranking with a score of 100/100 (50g protein per 100g).

How do you rank the best protein bars?

Every product is scored 0–100 on the share of its calories that come from protein — one public formula applied to the full UK nutrition label. No sponsored placements; the ranking recalculates automatically as new products are added.

How often is this ranking updated?

Automatically — every time a new protein bar is verified and added to the directory, the ranking recalculates. The date at the top of this page shows the last update.