Whey prices are up about 17%: reading inflation next to $/25g
Use the inflation tracker for market context, then decide with $/25g and Index.
TLDR
September 2026 sits at +16.9% vs first recorded price on WheyIndex; August was +17.6%. Pair the chart with cost per 25g and Index before you treat a deal tub as a win.
Bottom line
On WheyIndex’s inflation tracker, the September 2026 point sits at +16.9% versus each product’s first recorded price. August 2026 was +17.6%. Those figures come from recorded Amazon listing prices on our catalogue. They are separate from any Bureau of Labor Statistics series.
List price rising still leaves two shopping questions open: what you pay per 25g of protein today, and whether a discounted tub has a complete Index (formulation evidence included). Inflation is market context. The Index is the quality comparison for the scoop in your cart. Use $/25g for protein economics.
Tracker method
From the inflation page:
For each product, we compare its average recorded price in a month with its first recorded price in our database. The chart averages those percentage changes. A month needs enough listings before it appears on the chart.
Which products appear can change from month to month. Values are relative to each product’s first observation. They are not month-over-month deltas, and they are not calendar-year-to-date unless you switch the period control on the page.
This tracker describes recorded catalogue prices. Official CPI prints live elsewhere.
September 2026 snapshot
Rechecked against the live tracker (refresh again on publish):
| Month | Price change |
|---|---|
| Feb 2025 | 0.0% |
| Mar 2025 | -0.1% |
| Apr 2025 | +3.6% |
| May 2025 | +3.3% |
| Jun 2025 | -0.2% |
| Jul 2025 | +0.8% |
| Aug 2025 | +3.3% |
| Sep 2025 | +2.9% |
| Oct 2025 | +0.8% |
| Nov 2025 | +2.3% |
| Dec 2025 | +5.9% |
| Jan 2026 | -0.9% |
| Feb 2026 | +8.6% |
| Apr 2026 | +12.3% |
| Jun 2026 | +8.0% |
| Aug 2026 | +17.6% |
| Sep 2026 | +16.9% |
The path is uneven. Some months cool; later months climb. August 2026 is the highest all-time point currently on the chart. September stays elevated at +16.9%.
Latest catalogue check noted on the page at last fetch: Sep 8, 2026. Availability and prices move; re-pull before you cite a SKU.
Lowest cost per 25g next to the chart
Low $/25g examples from the live catalogue (verify day-of):
- Muscle Feast Grass-Fed WPI chocolate: about $0.91 per 25g protein (Index 94)
- Myprotein Impact Isolate unflavored: about $1.09 per 25g protein (Index 100)
A rising average list price leaves room for cheap-per-protein listings when tub size, protein per serving, and sale price cooperate. Formula from How the Index works:
Cost per 25g protein = (cost per serving ÷ protein grams per serving) × 25
The cost-per-25g guide covers that math in full. Here the narrower point: inflation context without $/25g is only half a shopping decision.
Below typical price
The same page flags listings meaningfully under their own recent typical price (median of eligible checks over recent months). Re-check the live page for current below-typical rows before you cite a SKU.
A below-typical flag means cheaper than this SKU usually is. Formulation simplicity, sugar per 25g, and scored vs Unscored still need a separate look. Pair the flag with Index /100 and $/25g before you treat it as a buy.
Value is only a small slice of Index. A sale can improve the value component while formulation and sugar stay put. Full weights: How the Index works. Unscored means incomplete evidence.
Practical read
- Open inflation for market context on whey list prices over time.
- Sort the finder by lowest cost per 25g for today’s protein economics.
- Read Index when scored; treat Unscored as missing evidence.
- Use below-typical as a timing signal on a specific SKU, then confirm $/25g and Index.
- Put finalists on Compare and share the link.
Scope
Affiliate links may earn a commission. They leave Index scores, $/25g, and the inflation series unchanged. This piece is catalogue price reporting plus shopping method. Medical advice and official CPI claims sit outside it.
Next step
Check the live September point (or whatever month is current at publish), then price your shortlist in $/25g and Index.