CHEAPEST
5.6g
174
9.6g
24g
Protein bars & snacks
Cheapest Protein Bars UK
Compare protein bars by price per bar, with calories, sugar and protein per bar.
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9.3g
117
4.8g
11.4g
Size
20 bars
10g
104
1.1g
12g
Choose size
17g
177
1.9g
13g
Size
12 bars
4.8g
133
7g
8.6g
Choose size
15.2g
198
5.8g
13.2g
Choose size
20.3g
260
0.9g
29.3g
Choose size
12g
140
1.4g
9.2g
MOST PROTEIN / BAR
Size
12 bars
37.5g
320
7.3g
19.5g
16.9g
298
12.4g
22.8g
Size
12 bars
16.3g
244
5g
28g
13.2g
217
0.9g
8.8g
15.1g
197
5.4g
13g
Size
12 bars
18.2g
201
1.8g
22.2g
Size
12 bars
18.2g
204
8.3g
14g
Size
12 bars
20g
218
2g
14.8g
Size
12 bars
8g
193
3.3g
14.1g
Choose size
20.4g
219
2.4g
15.6g
21.6g
228
1.4g
16.8g
22.4g
331
15.2g
33.6g
Choose size
19.8g
228
2g
20.5g
Browse All Protein Bars (21)
How we compare protein bars
Protein bars are priced by the box, and a box can hold six bars or twenty, so the sticker price tells you very little. Every bar on this page is ranked by what one bar costs, using the pack price divided by the number of bars in it, and the WheyWise codes at Prozis and Protein Works are already applied where the button lands there.
The nutrition on each card is per bar, taken from the label: calories, sugar, carbohydrate, protein and fat. A 60g bar with 20g of protein and 2g of sugar is a different product from a 40g bar with 10g of protein and 15g of sugar, even when the two cost the same, so read the pills together rather than any one of them.
We list the partner brands we can link straight to the product page (Prozis, Protein Works, Myprotein, Bulk), and well-known bars sold through Amazon. Clicking through takes you to the retailer's own page; some links earn WheyWise a commission, which never changes the order, which is price per bar only.
Methodology
How we rank every bag.
Independent and transparent. Every price is read from the retailer's own page and checked daily. Here's what goes into each score.
01
Cost normalised to £/bar
Every box divided by the number of bars in it, so a box of six and a box of twenty are compared on what one bar costs.
02
Protein density, measured
Protein per 100g from the product's own nutrition panel, so a 90% isolate and a 72% concentrate are never compared on bag price alone.
03
Real prices, checked daily
Prices come from the retailer's own listing, never an RRP, and we re-check them every day rather than leaving a feed to drift.
04
Rankings can't be bought
Rank order is price per bar. Some outbound links earn commission, and some Amazon links marked Ad pay per click; none of them buy a position in the table.
Questions, answered.
The pack price divided by the number of bars in the pack, using the retailer's current price. Where a WheyWise code applies at the retailer the button lands on, the code is applied first and the pack price is shown struck through beside it.
Per bar. The label's per-100g values are scaled by the weight of one bar, so a 60g bar and a 40g bar are compared on what you actually eat.
Their label has not been loaded yet. The price and the link are real, so they still appear, ranked by price per bar, with dashes in place of the figures until the label is read.
The grid above is ranked by price per bar, cheapest first, and re-checked regularly, so the top card is the cheapest bar we track right now. Use the brand filter to compare within one brand.