How many kilojoules are in protein coffee (proffee)?
A homemade proffee, an iced coffee made with milk and a scoop of protein powder, is roughly 700 to 1,200 kJ for about 25 to 35 g of protein, depending on the milk and the scoop. A plain milk flat white already carries about 7 g of protein for 300 kJ (skim) to 482 kJ (full cream). The scoop adds most of the extra energy, about 400 to 500 kJ. A black coffee has none of either.
Key numbers
- homemade proffee 700 to 1,200 kJ, 25 to 35 g protein
- plain flat white 7 g protein, 300 to 482 kJ
- scoop of protein powder about 400 to 500 kJ, 20 to 25 g protein
- black coffee under 20 kJ, 0 g protein
The coffee base, by milk
The protein in any milk coffee comes from the milk, not the coffee, so the base already does some of the work before you add anything. These are regular 240 mL cups.
| Coffee base (240 mL) | Energy | Calories | Protein |
|---|---|---|---|
| Long black (no milk) | <20 kJ | <5 Cal | 0 g |
| Almond milk flat white | 218 kJ | 52 Cal | <1 g |
| Skim milk flat white | 300 kJ | 72 Cal | ~7 g |
| Reduced fat flat white | 370 kJ | 88 Cal | ~7 g |
| Oat milk flat white | 454 kJ | 108 Cal | ~2 g |
| Full cream flat white | 482 kJ | 115 Cal | ~7 g |
| Soy milk flat white | 499 kJ | 119 Cal | ~6 g |
Build a proffee: base plus a scoop
A typical scoop of whey protein is about 30 g of powder, giving roughly 20 to 25 g of protein and about 400 to 500 kJ. Product panels vary, so check yours. Add it to the base above and the drink lands here.
| Build | Energy | Protein |
|---|---|---|
| Skim flat white + 1 scoop | ~750 kJ | ~31 g |
| Full cream flat white + 1 scoop | ~930 kJ | ~31 g |
| Almond flat white + 1 scoop | ~670 kJ | ~24 g |
| Iced coffee (250 mL skim milk) + 1 scoop | ~760 kJ | ~33 g |
| Iced coffee (250 mL full cream) + 1 scoop | ~1,150 kJ | ~33 g |
A cup of milk already brings about 8.5 g of protein on its own (roughly 700 kJ full cream, about 300 kJ skim), so most of the protein in a milk-based proffee is coming from the milk plus the scoop together, not the scoop alone.
The thing most people get wrong
Almond milk looks like the smart low-kilojoule base, but it adds under 1 g of protein, so a proffee built on it relies entirely on the scoop. Skim milk is usually the better base for a proffee: it keeps about 7 g of protein for roughly 300 kJ, the best protein-to-energy ratio of the common milks. If you are buying a ready-to-drink protein coffee instead, the only numbers that matter are protein per serve and kilojoules per serve on the panel: at least 15 g of protein under about 800 kJ is pulling its weight, under 10 g and over 1,000 kJ is closer to a milkshake.
Stop guessing the number
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Common questions
How many kilojoules are in a proffee?
A homemade proffee (an iced coffee made with milk and a scoop of protein powder) is roughly 700 to 1,200 kJ for about 25 to 35 g of protein, depending on the milk and the scoop. A skim-milk base keeps it near the low end; full cream milk pushes it higher.
Does protein coffee have a lot of kilojoules?
The coffee is cheap: a milk flat white is 300 to 482 kJ. The scoop of protein powder adds most of the extra, about 400 to 500 kJ. A ready-to-drink protein latte varies widely, from close to a flat white to over 1,000 kJ, so check the kilojoule figure on the panel.
How much protein is in a flat white without adding anything?
About 7 g in a regular 240 mL flat white, because the protein comes from the milk. A large 360 mL cup has about 11 g. Almond milk drops it under 1 g. A black coffee has none.
What is the best milk for a low-kilojoule proffee?
Skim milk: it keeps about 7 g of protein for roughly 300 kJ, the best protein-to-energy ratio of the common milks. Almond milk is lowest in kilojoules but adds almost no protein, so you rely entirely on the scoop.
Keep reading
Citing this page. OzCal (2026). "How Many Kilojoules in Protein Coffee (Proffee)? | OzCal". Retrieved from https://ozcal.com.au/kilojoules/protein-coffee. Last updated 2026-11-05. Figures are per the serve stated in each row, converted at 1 Cal = 4.184 kJ. A plain-text version of this page is available at https://ozcal.com.au/kilojoules/protein-coffee.md.