Original price analysis · published 2 November 2026 · by Which Bar?, operated by Vaperama Ltd.

Protein bar prices: what 20g of protein cost in our October 2026 sample

Across 68 qualifying dated GBP offers covering 26 brands, the median calculated cost per 20g of protein was £2.46. The range was £1.25–£8.05. These are 22–26 October 2026 observations from our catalogue, not a claim about today’s cheapest UK bar or the whole market.

Qualifying product records

68

Brands represented

26

Median / 20g protein

£2.46

Recorded range / 20g

£1.25–£8.05

Why the cheapest bar was not the cheapest protein

Powerbar Vanilla had the lowest recorded price per bar in this selection: £0.94, from a £15.02 pack of 16. With 10g protein per bar, its calculated equivalent was £1.88 per 20g protein.

Powerbar Lemon Cheesecake cost more per bar (£1.07) but supplied 17g protein per bar, bringing its equivalent to £1.25 per 20g. Its recorded pack spend was £15.98 for 15 bars. This illustrates a price-basis difference; it is not a taste, nutritional-quality or serving recommendation.

How the recorded protein costs were distributed

39 of 68 records fell between £2 and under £3 per 20g protein. Treat this as a description of this selected snapshot, rather than an estimate of what every shopper will pay.

What we included and excluded

The starting point was the 79 accepted dated records in our value comparison. We retained 68 whose recorded product type or name identifies a protein bar; the other 11 snack records were outside this narrower product scope. We did not select a fresh set of the cheapest listings from across the internet.

• Each included record has an exact positive serving weight, at least 10g protein, complete recorded nutrition and source evidence, and a qualifying dated GBP offer.
• The recorded offer must have a positive ordinary pack quote, explicit positive integer pack count, recorded in-stock observation and a check date no more than seven days before 26 October 2026. Where multiple offers qualified, the existing guide selected the lowest recorded cost per bar for that exact product.
• Serving, recipe and comparison-basis values were checked for consistency against the frozen published-catalogue checkpoint of 2 November. Each dated offer’s product/listing, pack and currency binding was retained. This consistency check was not a new wrapper, stock or price audit.
• Missing or disputed values were not estimated. Native EUR or CHF offers were not converted; no voucher, subscription, card or membership discount was introduced into the calculation.

Method and limits

Cost per bar = recorded pack quote ÷ bars in pack.
Cost per 20g protein = cost per bar × 20 ÷ protein grams per bar.

Calculations and ordering use the unrounded values; displayed prices are rounded to two decimal places. The median is the midpoint of the two middle calculated costs in the ordered 68-record sample. Every product/flavour record has equal weight: sales volume, pack popularity and brand market share are not used. Multiple flavours from one brand can appear, so this is not a balanced brand trial or a random market sample.

Some captured source quotes include delivery, while other delivery costs and seller conditions remain separate. We preserve the recorded quote rather than inventing a standard delivery charge. Current stock, pack size, regional recipes, shipping, seller terms and prices may differ. The most expensive observation is not a claim that a product is poor quality. We did not test taste, fullness or health outcomes.

Download and reproduce the analysis

Download all 68 rows (CSV) Download the data and method (JSON)

The files include exact flavour and serving identity, protein, pack quote, pack count, currency, observation date, source links and both calculated costs. Recalculate the formulas above, sort by the unrounded protein cost and take the middle two rows to reproduce the median. Read our wider source methodology.

All 68 dated observations

Ordered by unrounded cost per 20g protein. The seller link is for checking the current listing; the displayed price remains the dated observation.

Choose a bar for your own priorities

Use the protein-bar selector to set calorie, protein, recorded vegan-status and dated-price limits. For the wider historical sample, see the existing value comparison. Both explain the trade-offs and link to the individual product evidence.