Protein Calculator: How Much Protein Do You Need?
Protein Calculator: How Much Protein Do You Actually Need?
Most adults need roughly 0.8g of protein per kilogram of body weight for basic maintenance — but if you're losing weight, research consistently points to 1.2 to 1.6g per kilogram to help protect lean muscle while you're in a calorie deficit. This calculator does that math for you, then shows what the number actually looks like on a plate.
What your daily target looks like in food
How this calculator works
The calculation is body weight in kilograms multiplied by a protein coefficient drawn from published nutrition research. Those coefficients differ by goal because the demands differ:
General health & maintenance — 0.8 to 1.0 g/kg
The Recommended Dietary Allowance sits at 0.8g/kg. It's a floor designed to prevent deficiency in a sedentary adult, not an optimum — which is why nearly every other goal on this list sits above it.
Losing weight, protecting muscle — 1.2 to 1.6 g/kg
In a calorie deficit your body will break down lean tissue for fuel unless you give it a reason not to. A meta-analysis of 24 randomized controlled trials found that energy-restricted high-protein diets mitigated the loss of fat-free mass compared with standard-protein diets matched for calories (PMID: 23097268). A separate 12-week trial in 46 women measured it directly: at comparable total weight loss, the higher-protein group lost 1.5 kg of lean mass versus 2.8 kg (PMID: 17299116).
Losing weight + resistance training — 1.6 to 2.0 g/kg
Protein is the raw material; resistance training is the demand signal that tells your body what to build it into. When you're doing both, intake targets rise. Neither lever works well alone — we cover why in Losing Weight Without Losing Muscle.
Building muscle — 1.6 to 2.2 g/kg
Muscle gain research clusters in this range. Beyond roughly 2.2g/kg, additional protein shows diminishing returns in most studies.
More isn't always better
Worth knowing before you aim high: a 12-week randomized trial in 61 overweight older adults on a 25% energy restriction compared 1.7 g/kg/day against 0.9 g/kg/day — and the higher intake did not better preserve lean mass, strength, or physical performance (PMID: 26471344). Above a sufficient threshold, protein shows diminishing returns — and it works best paired with resistance training rather than stacked higher on its own.
The problem this calculator can't solve for you
Here's the honest part, folks. Running the number is the easy bit. Eating it is where people fail — especially when appetite is reduced.
Thirty grams of protein is five eggs. Or a full cup of Greek yogurt. Or a palm-sized chicken breast. When you're eating meaningfully smaller portions than you used to, hitting 100g+ from whole food alone stops being a matter of discipline and becomes a matter of physical capacity. That gap is the single most common thing we see.
If that's you, the practical playbook is in Eating Less, Nourishing More — high-protein breakfasts and zero-effort snacks built for a smaller appetite.
Get the full Nutrition During a GLP-1 Journey guide
Your protein number is step one. The complete guide covers protein, fiber, hydration, micronutrients, and a simple daily routine you can actually keep — written by our clinical team, with the studies cited so you can check us.
Closing the gap
When whole food alone won't reach your number, concentrated protein is an honest tool rather than a shortcut. Prolean Advanced 100% Whey Protein Isolate and Prolean Plant Protein are both designed to support daily protein intake and lean muscle maintenance alongside adequate nutrition and resistance exercise. For the training half of the equation, Creatine Hydration Powder delivers 5g of creatine monohydrate to support ATP availability and strength output.
Building a complete routine? Browse the full GLP-1 Support Supplements collection.
Common questions about protein intake
How much protein do I need per day to lose weight?
Research on preserving lean muscle during weight loss consistently points to 1.2 to 1.6 grams of protein per kilogram of body weight per day — roughly 92 to 123 grams for a 170-pound adult. That's meaningfully higher than the 0.8g/kg RDA, because a calorie deficit puts lean tissue at risk unless protein intake and resistance training give the body a reason to hold onto it.
How much protein per meal should I eat?
Most people do best splitting their daily target across meals at roughly 30 to 40 grams each, rather than loading it all into dinner. If your appetite is reduced, front-load it — appetite typically fades as the day goes on, so the protein you eat at breakfast is the protein you're most likely to actually get.
Is 100g of protein a day enough?
For a 170-pound (77kg) adult losing weight, 100g falls within the commonly cited 1.2–1.6 g/kg range and is a reasonable target. Whether it's enough for you depends on your body weight and whether you're resistance training — a heavier person or someone lifting regularly will need more.
Can I get enough protein if my appetite is low?
It's harder but achievable with strategy rather than willpower: eat protein first at every meal, front-load your day, keep zero-preparation options like hard-boiled eggs and cottage cheese on hand, and use a protein shake to close whatever gap remains. When chewing itself is the obstacle, drinking your protein is a legitimate answer.
Does protein powder count toward my daily target?
Yes — protein is protein, and your body doesn't distinguish by delivery format. Powder is best understood as a supplement to a whole-foods diet rather than a replacement for one, because whole foods bring iron, zinc, B12, and other nutrients along with the protein.
References
1. Wycherley TP, Moran LJ, Clifton PM, Noakes M, Brinkworth GD. Effects of energy-restricted high-protein, low-fat compared with standard-protein, low-fat diets: a meta-analysis of randomized controlled trials. Am J Clin Nutr. 2012;96(6):1281–1298. PMID: 23097268
2. Higher protein intake preserves lean mass and satiety with weight loss in pre-obese and obese women. Obesity (Silver Spring). PMID: 17299116
3. Verreijen AM, et al. Protein intake and lean body mass preservation during energy intake restriction in overweight older adults. Int J Obes. PMID: 26471344
This calculator provides general educational estimates based on published nutrition research and is not medical advice, a diagnosis, or a personalized nutrition plan. Individual protein needs vary with age, health status, kidney function, activity, and other factors. Anyone with kidney disease, liver disease, or any diagnosed medical condition, and anyone who is pregnant or nursing, should consult a healthcare provider before changing protein intake.
*These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease.