The calorie number on a tub of whey protein is easy to misread. "One scoop" has no standard size, so two products can list the same calories while giving very different amounts of protein.
This guide shows where the calories in a scoop come from, what our own labels say, and how to compare products on protein per calorie. If you are still deciding between the two main types, start with our guide to whey isolate vs concentrate.
Quick Answer: How Many Calories in 1 Scoop of Whey?
Most whey protein powders list about 100 to 150 calories per scoop, and most of those calories come from protein. Func Lab Whey Protein Isolate is about 130 kcal for 29 to 30 g of protein, and Whey Protein Concentrate in Chocolate is 138 kcal for 25 g. Scoop sizes differ between brands, so compare protein per calorie, not calories per scoop.
Where the Calories Come From
Food labels use the standard energy values of 4 calories per gram of protein, 4 per gram of carbohydrate and 9 per gram of fat. That lets you check any label yourself.
- Protein. 25 g of protein is 100 calories.
- Carbohydrate. 4 g of carbohydrate is 16 calories.
- Fat. 2 g of fat is 18 calories.
Fat is the main reason a scoop of concentrate carries more calories than the protein alone would suggest, since each gram has more than twice the energy of a gram of protein. If the calories on a label do not add up with these numbers, the label is worth a second look. Our protein powder label cheat sheet shows what else to check.
Func Lab Calories Per Scoop
These figures come from the nutrition panels on our product pages.
- Whey Protein Isolate, Chocolate. 130.9 kcal, 29 g protein, 2.2 g carbohydrate and 0.6 g fat. About 88% of the calories come from protein.
- Whey Protein Isolate, Unflavoured. 131 kcal and 30 g protein. About 88% of the calories come from protein.
- Whey Protein Concentrate, Chocolate. 138 kcal, 25 g protein, 4.5 g carbohydrate and 2.2 g fat. About 72% of the calories come from protein.
Check the numbers against the formula above. For the isolate, 29 g of protein, 2.2 g of carbohydrate and 0.6 g of fat come to about 130 calories. For the concentrate, 25 g, 4.5 g and 2.2 g come to about 138. The two scoops have similar calories, but the Whey Protein Isolate gives more protein for them, and the Whey Protein Concentrate gives more of its calories as fat and carbohydrate.
What Changes the Calorie Count
- Scoop size. "1 scoop" is whatever the brand chose. Look at grams of protein per scoop and calories together.
- Type of whey. Isolate is filtered further, so it has less fat and carbohydrate per gram of powder. Our guide to whey protein powder benefits and types covers all the forms.
- Flavouring. This depends on the sweetener. Our unflavoured isolate is 131 kcal and the chocolate version is 130.9 kcal, so the flavour adds almost nothing. Sugar or maltodextrin in other products will add more.
- Added ingredients. Maltodextrin, oats, MCT oil or milk solids raise the total. Mass gainers are a different product, often with several hundred calories per serving.
- What you mix it with. Milk adds its own calories. Water leaves you at the number on the label.
Calories and Weight Loss
Whey calories count the same as calories from any other food. A shake helps with weight loss when it replaces other calories or makes it easier to eat less.
A meta-analysis of 27 trials in adults aged 18 to 50 looked at eating fewer calories while including dairy foods or 20 to 84 g a day of whey. Over a median of 16 weeks, the dairy groups lost more body fat, an extra 1.49 kg, and lost slightly less lean mass, 0.36 kg less. The fat loss benefit appeared in studies that were mostly women and was absent in studies where people did resistance training (Stonehouse et al., Nutrients, 2016).
That is a modest effect, and it shows that protein helps you hold on to muscle when you eat less. If you are tracking calories, compare products on protein per calorie, as in the figures above.
How Much Protein Do You Need
A meta-analysis of 49 trials found that protein supplements stopped adding muscle gains at about 1.6 g per kg of body weight a day (Morton et al., British Journal of Sports Medicine, 2018). The ISSN protein position stand gives a range of 1.4 to 2.0 g per kg for people who exercise, and suggests 20 to 40 g per meal (Jäger et al., Journal of the International Society of Sports Nutrition, 2017).
For a 70 kg person, 1.6 g per kg is 112 g a day. One scoop gives 25 to 30 g, so it covers about a quarter of that. Our guide on how much protein you really need walks through the calculation, and the protein powder for muscle gain guide covers how much a powder adds.
Ways to Use a Scoop
- Mid-morning shake. Whey with water, between breakfast and lunch.
- Overnight oats. Stir half a scoop into the oats. Our protein-packed breakfast guide has more ideas.
- After training. Pair a scoop with a banana for protein and carbohydrate together.
- Coffee. Let the coffee cool a little first, then stir in a scoop.
- Baking and smoothies. Add it to batter or a blender. Our guide to why shakes go gritty helps with texture.
Travelling or just testing a flavour? Single-serve sachets give you one measured scoop at a time.
Choosing by Calories and Goal
- Cutting or tracking calories. Choose the powder with the most protein per calorie. Func Lab's Whey Protein Isolate gives 29 to 30 g of protein for about 130 kcal.
- Building muscle. The extra fat and carbohydrate in concentrate is not a drawback if you are eating in a surplus, and it is usually cheaper. Func Lab's Whey Protein Concentrate gives about 22 to 25 g per scoop.
- Everyone else. Pick the one you will take regularly, and fit the calories into your daily target.
Func Lab publishes batch test results on its Certified page, so you can check what is in the tub. If you want a plant option, read our comparison of plant protein vs whey protein.
Frequently Asked Questions
How many calories are in 1 scoop of whey protein?
Most whey powders list about 100 to 150 calories per scoop. Func Lab Whey Protein Isolate in Chocolate is 130.9 kcal for 29 g of protein, and Whey Protein Concentrate in Chocolate is 138 kcal for 25 g of protein. Check the grams per scoop on your label, because scoop sizes differ between brands.
Is whey isolate lower in calories than concentrate?
Per gram of powder, yes, because isolate carries less fat and carbohydrate. Per scoop, the gap can be small, because scoop sizes differ. Func Lab's Chocolate isolate is 130.9 kcal and its Chocolate concentrate is 138 kcal, but the isolate gives 29 g of protein and the concentrate 25 g. Compare protein per calorie instead of calories per scoop.
Do flavoured whey proteins have more calories?
Not always. Func Lab Whey Protein Isolate in Unflavoured is 131 kcal per serving and in Chocolate is 130.9 kcal, so the flavour adds almost nothing. Brands that use sugar or maltodextrin in their flavouring will show a bigger difference, so read the label.
Do whey protein calories count the same as food calories?
Yes. Calories from a shake count toward your daily energy balance like calories from any other food. A shake only helps with weight loss if it replaces other calories or helps you eat less overall.
Is 1 scoop of whey protein enough per day?
It depends on your target. For people who exercise, the ISSN position stand gives 1.4 to 2.0 g of protein per kg of body weight a day, so one scoop covers part of it. Treat the scoop as a top-up to food.
How many calories does milk add to a protein shake?
Milk adds its own calories on top of the powder, and the amount depends on the type and how much you pour. Mixing with water keeps you closest to the number on the label.
Can I take whey protein at night?
Yes. The calories matter as part of your daily total, not the clock time. If a shake fits within your calorie target for the day, it is fine to take in the evening.
Should I count whey differently when bulking or cutting?
The calories are the same. The choice that changes is how much protein you get per calorie. Isolate gives more protein for the calories, which helps on a cut, and concentrate costs less and suits a surplus.
The Bottom Line
A scoop of whey is roughly 100 to 150 calories, and most of them come from protein. Compare products by protein per calorie and check the grams per scoop before you compare anything else.
Add the shake to your daily total like any other food. Use whey isolate when you want the most protein for the calories, and whey concentrate when value and a creamier shake matter more.
This article is for general information and is not medical advice.
