How much protein do you actually need?
Protein requirements depend on what you are asking your body to do. The official minimum for sedentary adults — 0.8 grams per kilogram of body weight per day — is set to prevent deficiency, not to support hard training. For people who lift, sports nutrition research consistently points to substantially higher intakes:
| Goal | Protein per kg of body weight |
|---|---|
| General health / maintenance | 1.2 – 1.6 g/kg |
| Building muscle | 1.6 – 2.2 g/kg |
| Cutting (preserving muscle in a deficit) | 1.8 – 2.7 g/kg |
The calculator takes the midpoint of the range for your goal, and also shows the full range so you can adjust to appetite, budget and preference. Notice that the cutting range is the highest: when calories are restricted, extra protein protects muscle tissue, blunts hunger, and slightly increases the energy cost of digestion — three wins at once.
Why the "per meal" number matters
Muscle protein synthesis responds to individual feedings, and each meal appears to be most effective in the region of 0.4 g/kg — roughly 25–40 g for most people. Spreading your daily target over three to five meals is therefore a sensible default, which is why the calculator shows a per-meal figure based on four meals. That said, total daily protein remains by far the dominant factor; meal timing is fine-tuning, not foundation.
Hitting your target in practice
A target like 160 g can sound intimidating until you translate it to food. As reference points: a chicken breast provides roughly 45–55 g, a can of tuna about 25–30 g, three eggs about 18 g, 200 g of Greek yogurt about 20 g, and a scoop of whey protein 20–25 g. Lentils, beans, tofu and tempeh carry the load for plant-based lifters — plant proteins are somewhat less anabolic gram for gram, so vegans often aim for the upper end of their range.
Two practical habits make targets far easier to hit: anchor every meal around a protein source first, and front-load breakfast — the meal where most people under-eat protein by the widest margin.
Can you eat too much protein?
For healthy people, intakes well above these ranges have not been shown to harm kidney function or bone health in the research to date — the practical downsides are cost and crowding out carbohydrates and fats you also need. People with existing kidney disease are the exception and should follow medical guidance on protein intake. As with everything on this site, these figures are general education, not a substitute for personalised advice from a professional.