"About 30 servings" is the usual answer, and for a typical tub it is roughly right. But 1kg of whey can hold anywhere from 19 to 45 servings, depending on how big the scoop is. More useful than the serving count is the number almost nobody checks: how much actual protein is in the tub.
We looked at every 1kg whey protein in our catalogue where the label's serving count, scoop size and pack weight agree with each other — 505 tubs.
Figures were taken from our catalogue on 29 September 2026. Nutrition comes from each product's label as listed by the seller; we are a data platform, not a laboratory, and did not test these products ourselves — here is how we handle product data.
The Short Answer
- Typical: 28–30 servings. Half of all 1kg tubs (258 of 505) fall in this range. The median is 29 servings, from a 34g scoop.
- Range: 19 to 45 servings. Small-scoop isolates reach the high 30s and 40s; big-scoop budget blends drop to the low 20s.
- Total protein in a 1kg tub: usually 600–790g. The median is 720g — so roughly 72% of what you pay for is protein.
| Servings per 1kg | Share of tubs |
|---|---|
| 24 or fewer | 10% |
| 25–27 | 20% |
| 28–30 | 51% |
| 31–33 | 18% |
| 34 or more | 1% |
Why the Count Varies So Much
The serving count is just the pack weight divided by the scoop size the brand chose. A 1kg tub with a 25g scoop gives 40 servings; the same tub with a 45g scoop gives 22.
And the scoop size tracks purity closely:
- Tubs with a scoop of 44g or more typically give 22 servings at just 53% protein per scoop (medians across 44 tubs).
- Tubs with a scoop of 31g or less typically give 33 servings at 80% protein per scoop (medians across 67 tubs).
A big scoop is usually a sign that each serving carries a lot of something other than protein — typically carbohydrate from added maltodextrin or sugar. That is not always bad (it suits someone trying to gain weight), but it means "24g protein per serving" from a 45g scoop and "24g protein per serving" from a 30g scoop are very different products.
Real Examples
Here is what some widely bought 1kg tubs actually contain, from their labels:
| Product | Scoop | Protein / scoop | Servings | Total protein in tub |
|---|---|---|---|---|
| Myprotein Impact Whey (1kg) | 25g | 20g | 40 | 800g |
| Fuel One Whey Iso-Max (1kg) | 34g | 28g | 29 | 812g |
| AS-IT-IS ONE Whey Protein Isolate (1kg) | 38g | 30g | 26 | 780g |
| Nakpro Platinum Whey Protein Isolate (1kg) | 38g | 29.7g | 26 | 772g |
| ON Gold Standard 100% Whey (2 lb / 907g) | 29.5g | 24g | 30 | 720g |
| MuscleTech NitroTech (1kg) | 46g | 30g | 22 | 660g |
| MuscleBlaze Biozyme Performance Whey (1kg) | 38.5g | 25g | 25 | 625g |
| Fuel One Whey Protein (1kg) | 39g | 24g | 25 | 600g |
| Nakpro Impact Whey Protein (1kg) | 45g | 24g | 22 | 528g |
Myprotein Impact has the most servings here (40) because its scoop is the smallest, but Fuel One Iso-Max holds slightly more total protein with 11 fewer servings. Nakpro Impact and Fuel One Whey Protein both list "24g protein per serving" — yet one tub holds 528g of protein and the other 600g.
Note that ON Gold Standard's "2 lb" tub is 907g, not 1kg, which is why its total looks lower.
How to Use This When Buying
- Multiply, don't read. Protein per scoop × number of servings = total protein in the tub. Divide the price by that and you have what you really pay per gram of protein.
- Compare cost per 100g of protein, not cost per serving. A cheaper-looking serving is often just a smaller one. Every product page on ChooseSahi shows cost per serving, and our cheapest protein per gram ranking sorts by the fairer measure.
- Check the scoop size against the protein. Divide protein per scoop by scoop size to get purity. Under 60% and a large share of every scoop is not protein.
- Work out how long a tub lasts you. At one scoop a day, a typical 1kg tub lasts about four weeks. At two scoops a day, about two weeks. Most people only need one scoop to top up their diet — see how much protein you need per day.
Frequently Asked Questions
How many scoops are in 1kg of whey protein?
Usually 28–30. Across 505 tubs in our catalogue the median was 29 scoops from a 34g scoop, with a full range of 19 to 45 depending on scoop size.
How long does 1kg of whey protein last?
About four weeks at one scoop a day and two weeks at two scoops a day, for a typical 29-serving tub. Big-scoop blends with around 22 servings run out a week sooner at the same rate.
Is a tub with more servings better value?
Not necessarily. More servings usually just means a smaller scoop. Compare total protein in the tub (protein per scoop × servings) or cost per 100g of protein instead — a 40-serving tub and a 29-serving tub can hold almost the same amount of protein.