Protein Calculator — Find Your Exact Daily Protein Intake
Protein Intake Calculator — Find Your Exact Daily Protein Needs
Last updated: August 2026 · Medically reviewed by a Registered Dietitian · 8 min read
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Protein Calculator Based on Weight, Activity, and Goals
Want to know how this protein calculator works? Jump to the formula section below.
Why Use This Calculator
Most online protein calculators give you a single number with no explanation. This one is built differently:
Every formula and recommendation on this page is checked by a Registered Dietitian, not just written by a marketer.
You can see exactly how your number is calculated below — no black box.
Ranges are drawn from ISSN position stands and peer-reviewed resistance-training studies, linked throughout.
Your target adjusts for muscle gain, fat loss, or general health — not a flat RDA number.
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How to Calculate Your Protein Intake (Step-by-Step)
To calculate your protein intake, take your body weight in kilograms and multiply it by a gram-per-kilogram target based on your activity level and goal. That single multiplication is the entire calculation — the calculator above does it instantly, but here's exactly what it's doing behind the scenes.
A 70 kg person training for muscle gain uses a target of 1.6–2.2 g/kg.
70 × 1.6 = 112g (low end) · 70 × 2.2 = 154g (high end) per day.
Step-by-Step
- Find your body weight in kilograms. If you only know pounds, divide by 2.2 (e.g. 154 lb ÷ 2.2 = 70 kg).
- Choose your target range from the table below based on your goal and activity level.
- Multiply your body weight by the low and high end of that range to get your daily gram target.
- Split the total across 4–5 meals rather than eating it in one or two sittings.
Protein Targets by Goal
| Goal / Population | Target Range | Example (70 kg) |
|---|---|---|
| General health (RDA minimum) | 0.8 g/kg | 56g/day |
| Active / resistance training | 1.2–1.7 g/kg | 84–119g/day |
| Muscle gain | 1.6–2.2 g/kg | 112–154g/day |
| Weight loss (preserve muscle) | 1.6–2.4 g/kg | 112–168g/day |
| Adults 65+ | 1.0–1.2 g/kg | 70–84g/day |
Ranges reflect the International Society of Sports Nutrition's position stand on protein and exercise, a meta-regression of resistance-training trials showing gains plateau near 1.6–2.2 g/kg/day, and NIH Dietary Reference Intake guidance for older adults. Individual needs vary — see a registered dietitian for personalized guidance, especially with kidney disease, pregnancy, or other medical conditions.
What to Do With Your Protein Result
Step 1 — Match Your Result to Your Goal
Build Muscle
- Aim for 1.6–2.2 g/kg body weight
- Spread protein across 4–5 meals
- Include protein within 2 hours of training
Lose Weight
- Aim for 1.2–1.6 g/kg to preserve muscle
- High-protein meals reduce hunger by up to 35%
- Prioritize low-calorie, high-protein foods
Maintain & Stay Healthy
- Minimum 0.8 g/kg per day (RDA)
- Focus on consistent daily intake
- Whole food protein sources preferred
Step 2 — Turn Your Target Into a Daily Plan
Step 3 — Best Times to Eat Protein Each Day
| Time of Day | Recommended Amount | Best Food Sources |
|---|---|---|
| Breakfast (7–9 AM) | 30–40g | Eggs, Greek yogurt, cottage cheese, protein shake |
| Lunch (12–1 PM) | 35–45g | Chicken breast, beans, lentils, tofu |
| Pre/Post Workout Most Important | 30–40g | Whey protein, chicken, Greek yogurt |
| Dinner (6–8 PM) | 35–45g | Salmon, lean beef, eggs, legumes |
| Before Bed (optional) | 20–30g | Casein protein, cottage cheese, milk |
Individual protein needs vary based on health conditions, medications, and medical history. The values above are general guidelines. Consult a registered dietitian or nutritionist for personalized advice.
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REVIEWED & WRITTEN BY
Shady Elbody — SEO Specialist, Founder of CalculatorProtein.com
Shady is an SEO specialist and the founder of CalculatorProtein.com, a protein calculator resource used by athletes and fitness enthusiasts worldwide. He combines deep expertise in search optimization with evidence-based sports nutrition, built around ACSM, ISSN, and current PubMed-reviewed research.
Medically reviewed by [Registered Dietitian Name], RDN — credentials and bio to be added.
Last Updated: August 2026
Frequently Asked Questions
How do I calculate my protein intake?
Multiply your body weight in kilograms by a gram-per-kilogram target based on your goal — 0.8 g/kg for general health, 1.6–2.2 g/kg for muscle gain, or 1.6–2.4 g/kg for fat loss while preserving muscle. The calculator above does this instantly using your age, weight, activity level, and goal.
How much protein do I need to build muscle?
Most research, including the ISSN position stand, supports 1.6–2.2 g/kg of body weight per day for muscle gain, spread across 4–5 meals for best results.
Can I eat too much protein?
For healthy adults, protein intake up to roughly 2.2–3.0 g/kg is generally considered safe. People with kidney disease or other medical conditions should consult a doctor or registered dietitian before increasing protein intake.
Is this protein calculator accurate?
This protein calculator uses established, peer-reviewed formulas (ISSN position stand, PROT-AGE guidance) rather than a proprietary black-box formula, and the ranges are reviewed by a Registered Dietitian. Individual needs still vary — treat the result as a starting point, not a medical prescription.
