Mass Gainer vs Whey Protein: Which One Do You Need?

Mass gainer vs whey protein comes down to one thing: calories. Whey protein gives you about 24 g of protein for roughly 120 Calories a scoop, while a mass gainer adds a large serve of carbs and some fat, so one shake can supply 560 to over 2,000 Calories. If you already eat enough and want more protein, choose whey. If you struggle to eat enough to gain weight, a mass gainer can help. This guide compares popular options in Australia, with cost per serve, and shows how to use a gainer without overdoing it.

Mass gainer vs whey protein at a glance

Figures are from each label (one flavour; values vary slightly between flavours). Cost per serve uses the serves listed on the label, so use it as a guide. Prices are at the time of writing.

What is the difference between a mass gainer and whey protein?

Whey protein is a milk protein powder. A scoop is mostly protein with very little carbohydrate or fat. ON Gold Standard 100% Whey, for example, gives 24 g of protein and 3 g of carbs in a 30.4 g scoop. It is a convenient way to top up protein without adding many calories.

A mass gainer is a high-calorie shake. It contains protein, usually whey and casein, plus a large serve of carbohydrate, mostly from maltodextrin and other starches, and a little fat. Some also add extras. CBUM Mass Gainer includes 2.5 g of creatine monohydrate per serve, and Mass Tech Extreme 2000 includes 3 g of creatine per full serve.

Gram for gram, both give you similar quality protein. The real difference is the energy. One CBUM serve has about nine times the Calories of a scoop of Gold Standard, but a little over twice the protein.

Choose whey protein if

• You want lean muscle without much weight gain. Whey helps you hit your protein target while you control calories with food.
• You are cutting or maintaining. A mass gainer makes a calorie deficit very hard.
• You already eat big meals. If you are gaining weight on your current diet, you do not need the extra carbs.
• You want flexibility. Whey can go into oats, smoothies or baking, so you decide how many calories each shake adds.

The ISSN suggests 1.4 to 2.0 g of protein per kg of body weight a day for most people who train. For a 75 kg person, that is about 105 to 150 g a day. A whey blend such as R1 Whey Blend (24 g of protein a scoop) makes that easier.

Choose a mass gainer if

• You struggle to gain weight. If you feel full fast, have a small appetite or are very active, drinking calories is easier than eating more meals.
• You are bulking on purpose. To build muscle, most lifters need a small calorie surplus, and a gainer helps you reach it.
• You are short on time. A gainer can stand in for a snack when you cannot sit down to a meal.

Not all gainers are the same. R1 Clean Gainer sits at the lighter end with 560 Calories a serve, which suits most people starting a bulk. CBUM Mass Gainer is in the middle at 1,070 Calories. Mass Tech Extreme 2000 is at the top, with 2,160 kcal per full serve with water, or 2,340 kcal and 80 g of protein with 500 mL of skim milk. You do not have to use a full serve. Start with a smaller one and build up.

How to use a mass gainer without gaining too much fat

A mass gainer does not cause fat gain by itself, but a calorie surplus that is too big will. A 2019 review on bodybuilding nutrition suggests eating about 10 to 20% above your maintenance calories and aiming to gain about 0.25 to 0.5% of your body weight per week. For a 70 kg person, that is roughly 175 to 350 g a week.

• Start small. Try a half serve a day for two weeks and watch your weight.
• Split big serves. Drinking 1,000 Calories in one go can upset your stomach. Have half after training and half later in the day.
• Keep eating meals. A gainer should add to your food, not replace it.
• Adjust each fortnight. If you are gaining much faster than your target, cut back the serve. If nothing changes, add a little.

Our bulking diet plan shows how to build a surplus with food first.

Can you make your own gainer with whey?

Yes, and it is a popular choice. Blend a scoop of whey with full-cream milk, rolled oats, a banana and a spoon of peanut butter. You control the calories and the ingredients, and you can use the same tub of whey when you finish bulking. The trade-off is time and fridge space. A ready-made gainer is quicker, easier to carry in a gym bag and has a fixed number on the label, which makes tracking simple. If you are unsure which type of whey to use, see our post on whey blend vs whey isolate.

Our verdict: which one do you need?

For most people who train, whey protein is the better buy. It costs less per serve, works for cutting and bulking, and lets food supply the rest of your calories. ON Gold Standard 100% Whey 5 lb is one of our best sellers in the last six months.

If you are a hard gainer who cannot eat enough, a mass gainer earns its place. Start with R1 Clean Gainer for a moderate 560 Calories a serve, or step up to CBUM Mass Gainer if you need more. Save Mass Tech Extreme 2000 for very high calorie needs, and use part serves.

Compare more options in our best mass gainer in Australia guide and best protein powder guide, or browse all weight gainers.

How our price compares

Here is what the same products cost at other Australian supplement stores, so you can check the difference yourself.

Supps247 prices come from our website. Other prices were checked on the websites of Nutrition Warehouse, Australian Sports Nutrition (ASN), Elite Supps and Supplement Mart on 29 October 2026 (same product and size, price for one unit) and can change at any time. Sale means it was on sale that day. Some flavours means that price was for some flavours only. Out of stock means it was listed but not available that day. Not listed means we could not find that exact product on their site. Supps247 members can use our Price Match Guarantee against Nutrition Warehouse, ASN, Elite Supps and Supplement Mart: we beat their full price by 5% or match their sale price (conditions apply).

Shop the products in this guide

ON Gold Standard 100% Whey 5 lb$219.95R1 Clean Gainer 30 serves$174.95CBUM Mass Gainer 12 lb$139.95Mass Tech Extreme 2000 12 lb$159.95

Browse all weight gainers and whey protein powders.

FAQs

Is a mass gainer better than whey protein for building muscle?

Not by itself. Muscle growth depends on training, total daily protein and, for most people, a small calorie surplus. A mass gainer only helps if you cannot reach that surplus with food. If you already eat enough, whey protein gives you the same quality protein for far fewer calories and a lower cost per serve.

Can I take mass gainer and whey protein together?

Yes, but most people do not need both. Some lifters have a gainer once a day to add calories and a whey shake after training for extra protein. Add up the calories and protein from both against your daily target, because two shakes plus meals can push you well past the surplus you need.

Will a mass gainer make me fat?

Only if it puts you in a bigger calorie surplus than your body can use for muscle. A 2019 review suggests a surplus of about 10 to 20% above maintenance and a gain of about 0.25 to 0.5% of body weight per week. Start with a half serve, weigh yourself weekly and adjust the amount.

When should I drink a mass gainer?

Any time that helps you hit your daily calories. Many people have one after training or between meals. If a full serve makes you feel too full, split it into two smaller shakes across the day. Timing matters much less than your total calories and protein over the day.

Where can I buy mass gainers in Australia?

Supps247 stocks gainers from Rule 1, CBUM, MuscleTech and more online, with Australia-wide delivery, free shipping on orders of $99.99 or more and Afterpay at checkout. You can also use click and collect at stores that offer it, or visit a Supps247 store in Victoria or Queensland. Stock varies by store.

Sources: ISSN protein and exercise position stand (2017); Iraki and colleagues (2019), nutrition recommendations for bodybuilders in the off-season; product labels and brand nutrition panels, checked October 2026.

Order online with Australia-wide delivery, free on orders of $99.99 or more, with Afterpay available at checkout. You can also use click and collect at a store that offers it, or visit a Supps247 store in Melbourne, regional Victoria or Brisbane to compare products in person. Members can use our member price match on full-priced items.

Prices and stock were checked on 29 October 2026 and can change at any time. Always read the label and follow the directions for use. If you have a medical condition, are pregnant or take regular medication, check with your doctor first.