Protein Calculator: How Much Protein Do You Actually Need? (2026)
Free protein calculator with goal presets — cutting, bulking, GLP-1 medication, hard gainer. Plus a reference table by bodyweight and the per-meal split most people get wrong.
Key takeaways
- Most adults need 1.2–1.6 g of protein per kg bodyweight per day. In a calorie deficit or on a GLP-1, raise it to 1.6–2.4 g/kg to protect muscle.
- More than ~2.2 g/kg doesn't build extra muscle for most lifters. The exception is true hard gainers, where 2.2–3.4 g/kg helps in an aggressive surplus.
- Per-meal distribution matters: aim for 30–40 g of high-quality protein at each main meal to maximize muscle protein synthesis.
- The US RDA of 0.8 g/kg is a deficiency-prevention floor, not an optimal-health target. Most active adults benefit from roughly double that.
- Hitting your protein number is more about consistency than perfection. Two days at 90% is better than one day at 110% and one at 60%.
title: "Protein Calculator: How Much Protein Do You Actually Need? (2026)" description: "Free protein calculator with goal presets — cutting, bulking, GLP-1 medication, hard gainer. Plus a reference table by bodyweight and the per-meal split most people get wrong." publishedAt: "2026-05-27" updatedAt: "2026-05-27" author: "Inlab Products" category: "Nutrition" tags: ["protein calculator", "how much protein do I need", "protein per kg bodyweight", "protein on Ozempic"] keyTakeaways:
- "Most adults need 1.2–1.6 g of protein per kg bodyweight per day. In a calorie deficit or on a GLP-1, raise it to 1.6–2.4 g/kg to protect muscle."
- "More than ~2.2 g/kg doesn't build extra muscle for most lifters. The exception is true hard gainers, where 2.2–3.4 g/kg helps in an aggressive surplus."
- "Per-meal distribution matters: aim for 30–40 g of high-quality protein at each main meal to maximize muscle protein synthesis."
- "The US RDA of 0.8 g/kg is a deficiency-prevention floor, not an optimal-health target. Most active adults benefit from roughly double that."
- "Hitting your protein number is more about consistency than perfection. Two days at 90% is better than one day at 110% and one at 60%." faq:
- question: "How much protein do I need per day?" answer: "For most adults: 1.2–1.6 g per kg of bodyweight, which is roughly 0.55–0.73 g per pound. Active adults in a calorie deficit or on a GLP-1 medication should go higher, 1.6–2.4 g/kg. Use the calculator above for your exact number."
- question: "Is 100 g of protein a day enough?" answer: "For a 60 kg / 132 lb adult at maintenance, yes — that's about 1.7 g/kg, near the upper end of normal recommendations. For an 80 kg / 176 lb adult, 100 g is only 1.25 g/kg — fine for sedentary maintenance but low for a deficit or muscle gain. Multiply your kg of bodyweight by 1.2–1.6 to get your floor."
- question: "Can you eat too much protein?" answer: "For healthy adults, protein intakes up to 3.0–3.5 g/kg/day are well tolerated in research. Beyond ~2.2 g/kg there's no additional muscle benefit for most people, so the upper limit is more about diminishing returns than safety. People with chronic kidney disease should work with a doctor before raising protein."
- question: "Does protein on a GLP-1 (Ozempic, Wegovy, Mounjaro) need to be higher?" answer: "Yes. GLP-1 weight loss is muscle-prone because appetite drops sharply and total food intake falls. Aim for a 1.6 g/kg floor, prioritize lean protein at each meal, and consider resistance training. See our GLP-1 diet plan guide."
- question: "How much protein per meal is optimal?" answer: "Research suggests 30–40 g of high-quality protein per meal is roughly the ceiling for stimulating muscle protein synthesis in a single sitting. For most adults that means splitting your daily target across 3–4 meals rather than dumping it all into dinner."
If you came here from Google, you want a number. Here it is.
The 30-second answer
Take your bodyweight in kg and multiply by 1.2 to 1.6. That's your daily protein target in grams. If you're cutting, on a GLP-1, or trying to build muscle, multiply by 1.6 to 2.2 instead.
Skip the math:
Free protein calculator
Per-kg targets from the research consensus. All math is on-device — nothing leaves your browser.
Cutting (calorie deficit): Higher protein protects muscle while you lose fat. Range is 1.6–2.4 g/kg (70 kg × 1.6–2.4). Protein contributes ~560 kcal — count it against your daily target.
Why the RDA (0.8 g/kg) is too low for most adults
The US RDA for protein — 0.8 g/kg/day — is the amount needed to prevent deficiency in sedentary adults. It is not the amount needed to optimize body composition, recovery, or healthy aging.
A 2022 ISSN position stand and decades of follow-up research consistently land on these working numbers for active adults:
| Goal | Protein (g per kg bodyweight) | Protein (g per lb) |
|---|---|---|
| Sedentary maintenance (RDA floor) | 0.8 | 0.36 |
| General health, light activity | 1.2–1.4 | 0.55–0.64 |
| Recreational lifting, weight maintenance | 1.4–1.8 | 0.64–0.82 |
| Cutting (calorie deficit) | 1.6–2.4 | 0.73–1.09 |
| Muscle gain (calorie surplus) | 1.6–2.2 | 0.73–1.00 |
| On a GLP-1 (Ozempic / Wegovy / Mounjaro) | 1.6–2.0 | 0.73–0.91 |
| Hard gainer (struggling to gain) | 2.2–3.4 | 1.00–1.55 |
Daily protein targets — quick reference
Midpoint targets in grams per day, by bodyweight and goal.
Maintenance (1.4 g/kg)
| Bodyweight | Daily protein |
|---|---|
| 50 kg / 110 lb | 70 g |
| 60 kg / 132 lb | 84 g |
| 70 kg / 154 lb | 98 g |
| 80 kg / 176 lb | 112 g |
| 90 kg / 198 lb | 126 g |
| 100 kg / 220 lb | 140 g |
Cutting or GLP-1 (2.0 g/kg)
| Bodyweight | Daily protein |
|---|---|
| 50 kg / 110 lb | 100 g |
| 60 kg / 132 lb | 120 g |
| 70 kg / 154 lb | 140 g |
| 80 kg / 176 lb | 160 g |
| 90 kg / 198 lb | 180 g |
| 100 kg / 220 lb | 200 g |
Hard gainer (2.8 g/kg)
| Bodyweight | Daily protein |
|---|---|
| 50 kg / 110 lb | 140 g |
| 60 kg / 132 lb | 168 g |
| 70 kg / 154 lb | 196 g |
| 80 kg / 176 lb | 224 g |
| 90 kg / 198 lb | 252 g |
The per-meal split most people get wrong
Daily total matters most, but distribution is a real second-order lever. Research on muscle protein synthesis (MPS) suggests:
- The MPS response to a single meal plateaus around 30–40 g of high-quality protein for most adults. Older adults need the higher end because of anabolic resistance.
- Going much higher in a single meal (say, 80 g at dinner) is not "wasted" — the extra protein is still used for general metabolism — but it doesn't stack additional muscle-building benefit on that meal.
- Splitting your daily target into 3–4 meals of 30–40 g each is the practical sweet spot.
A 70 kg adult eating 140 g/day:
| Meals/day | Per meal |
|---|---|
| 3 meals | ~47 g (a little above the MPS ceiling — fine) |
| 4 meals | ~35 g (right in the sweet spot) |
| 5 meals (snacks count) | ~28 g (slightly under — still works) |
| 1 meal (OMAD) | 140 g (a lot at once; OMAD is not optimal for muscle, but works for weight management) |
Special case: protein on a GLP-1 medication
GLP-1 drugs (Ozempic, Wegovy, Mounjaro, Zepbound) suppress appetite so strongly that most users involuntarily drop total food intake by 20–35%. That's good for weight loss but bad for muscle if protein drops proportionally.
- Set a 1.6 g/kg floor, not a percentage of calories. A grams-based floor is harder to undercut on low-appetite days.
- Front-load protein. Many GLP-1 users eat well at breakfast and lunch but lose interest by dinner. Get 50–60% of your daily protein in by 2 pm.
- Liquid protein when solid food won't go down. A whey or pea-protein shake delivers 25–30 g in 250–300 ml.
For the full GLP-1 nutrition framework, see GLP-1 diet plan: what to eat on Ozempic, Wegovy & Mounjaro.
Special case: the hard gainer
If you're consistently trying to gain weight and lifting hard, the upper end of the protein range (2.2–3.4 g/kg) helps drive lean-mass accrual specifically rather than just total weight. Combine with a calorie surplus of 250–500 kcal/day. The full playbook is in our hard gainer guide.
How to actually hit the number
The protein gap most adults face is not strategy, it's tracking. People reliably under-log meat portions and forget to count protein in carby foods (bread has 3–4 g per slice; pasta has 7–8 g per cooked cup). Two compounding errors:
- Under-logging protein on photos (chicken portions look smaller than they are).
- Forgetting incidental protein in side dishes.
The fix is a tracker that recognizes whole meals (not single items) and lets you adjust portion size after the fact. Callie's photo + voice logging is built for this — and the review-before-confirm step catches portion misjudgments before they bake into your weekly average.
Common protein-rich foods, sorted by g per 100 kcal
When you're in a calorie deficit, density matters. These foods give you the most protein per calorie spent:
| Food | Protein per 100 kcal |
|---|---|
| Egg whites | ~21 g |
| Whey isolate | ~22 g |
| Cod, plain | ~21 g |
| Chicken breast, skinless | ~18 g |
| Greek yogurt 0% | ~17 g |
| Tofu, firm | ~12 g |
| Lentils, cooked | ~7 g |
| Whole eggs | ~8 g |
| Almonds | ~3.5 g |
When to recalculate
Your protein target follows your bodyweight, so every 5 kg / 10 lb of weight change is worth a recheck. Also recheck if you:
- Start or stop a GLP-1 medication
- Switch from maintenance to a cut or surplus
- Start strength training after a sedentary period
- Cross age 65 (older adults benefit from the upper end of the range due to anabolic resistance)
Bodyweight in kg × 1.6 is a defensible target for almost any active adult. If you're cutting or on a GLP-1, push it to 2.0. Hit that number 5–6 days a week — the result compounds far more than perfect macro hair-splitting on any single day.
Frequently asked questions
How much protein do I need per day?
For most adults: 1.2–1.6 g per kg of bodyweight, which is roughly 0.55–0.73 g per pound. Active adults in a calorie deficit or on a GLP-1 medication should go higher, 1.6–2.4 g/kg. Use the calculator above for your exact number.
Is 100 g of protein a day enough?
For a 60 kg / 132 lb adult at maintenance, yes — that's about 1.7 g/kg, near the upper end of normal recommendations. For an 80 kg / 176 lb adult, 100 g is only 1.25 g/kg — fine for sedentary maintenance but low for a deficit or muscle gain. Multiply your kg of bodyweight by 1.2–1.6 to get your floor.
Can you eat too much protein?
For healthy adults, protein intakes up to 3.0–3.5 g/kg/day are well tolerated in research. Beyond ~2.2 g/kg there's no additional muscle benefit for most people, so the upper limit is more about diminishing returns than safety. People with chronic kidney disease should work with a doctor before raising protein.
Does protein on a GLP-1 (Ozempic, Wegovy, Mounjaro) need to be higher?
Yes. GLP-1 weight loss is muscle-prone because appetite drops sharply and total food intake falls. Aim for a 1.6 g/kg floor, prioritize lean protein at each meal, and consider resistance training. See our [GLP-1 diet plan guide](/blog/glp-1-diet-plan-ozempic-wegovy-mounjaro).
How much protein per meal is optimal?
Research suggests 30–40 g of high-quality protein per meal is roughly the ceiling for stimulating muscle protein synthesis in a single sitting. For most adults that means splitting your daily target across 3–4 meals rather than dumping it all into dinner.
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