Your Protein Targets
Based on body weight
—
GRAMS / DAY
Daily Target
—
GRAMS / MEAL
Per Meal (3 meals)
—
GRAMS / DAY
Safe Range
What That Looks Like In Food
—
Chicken Breasts
(~31g each)
—
Whole Eggs
(~6g each)
—
Greek Yogurt Cups
(~17g each)
—
Cans of Tuna
(~25g each)
Your target within the safe range —%
Use the Daily protein calculator above to determine your personalised daily protein target in seconds. Enter your body weight (kg or lbs), age, biological sex, activity level, and fitness goal — the tool instantly delivers your daily protein requirement in grams, suggested protein per meal, a safe intake range, and a real‑food breakdown showing how many chicken breasts, eggs, Greek yogurt cups, or tuna cans match your daily target. Whether you are trying to lose fat, maintain your weight, or build muscle, this free online daily protein calculator takes the guesswork out of nutrition planning.
Below you will find a complete step‑by‑step guide to using the protein calculator, the science behind protein requirements, recommended intake by goal, food sources for plant‑based and meat‑based diets, common mistakes, and answers to frequently asked questions about daily protein intake.
How to Use the Protein Calculator
The protein calculator uses evidence‑based formulas from sports nutrition research and adjusts your target based on age, sex, activity, and goal. Here is the step‑by‑step process:
- Body Weight: Enter your current body weight. Tap the Kg / Lbs toggle to switch units. Body weight is the most important input because all protein recommendations are expressed in grams per kilogram (or pound) of body weight.
- Age: Enter your age in years. Protein needs increase slightly with age — older adults need more protein to fight age‑related muscle loss (sarcopenia).
- Biological Sex: Select Male or Female. Men typically need slightly more protein in absolute terms due to higher lean mass, while women have nearly identical needs per kg of body weight.
- Activity Level: Choose from Sedentary (little/no exercise), Lightly Active (1–2 days/week), Moderately Active (3–5 days/week), Very Active (6–7 days/week), or Athlete/Heavy Training. Higher activity dramatically increases protein needs because exercise breaks down muscle tissue that needs to be rebuilt.
- Your Goal: Tap one of three options — Lose Fat (preserve muscle while cutting), Maintain (stay at current weight & strength), or Build Muscle (maximize lean mass gains). Each goal uses a different protein multiplier.
- Click “Calculate My Protein” — The protein calculator instantly displays your daily target in grams, grams per meal (assuming 3 meals/day), safe minimum and maximum range, a real‑food visualisation, and a progress bar showing where your target lands within the safe range.
How Much Protein Do You Need? Science‑Based Recommendations
The Recommended Dietary Allowance (RDA) from the National Institutes of Health sets a baseline of 0.8 g of protein per kg of body weight for sedentary adults — but this is the bare minimum to prevent deficiency. Modern sports nutrition research recommends much higher amounts for active people and anyone trying to change their body composition.
| Goal & Activity | Recommended Protein | Example (70 kg person) |
|---|---|---|
| Sedentary adult (RDA) | 0.8 g/kg | 56 g/day |
| General health & light activity | 1.0–1.2 g/kg | 70–84 g/day |
| Maintain weight + moderate exercise | 1.2–1.6 g/kg | 84–112 g/day |
| Lose fat (preserve muscle) | 1.6–2.2 g/kg | 112–154 g/day |
| Build muscle / strength athletes | 1.6–2.2 g/kg | 112–154 g/day |
| Endurance athletes | 1.2–1.6 g/kg | 84–112 g/day |
| Older adults (65+) | 1.2–1.6 g/kg | 84–112 g/day |
These ranges come from peer‑reviewed studies summarised by the Academy of Nutrition and Dietetics and the International Society of Sports Nutrition (ISSN). For a deeper scientific dive, see Examine.com’s protein guide.
Worked Example — 40 kg Male, Building Muscle
Using the inputs from the calculator screenshot:
- Body Weight: 40 kg
- Age: 15 years
- Sex: Male
- Activity: Moderately Active
- Goal: Build Muscle (≈ 2.1 g/kg)
Daily Target
84 g
Per Meal (3)
28 g
Safe Range
32 – 88 g
What 84 g looks like in real food:
- 🍗 2.7 chicken breasts (~31 g protein each)
- 🥚 14 whole eggs (~6 g each)
- 🥛 4.9 Greek yogurt cups (~17 g each)
- 🐟 3.4 cans of tuna (~25 g each)
The Best Protein Sources
Animal‑Based Sources (Complete Proteins)
| Food | Serving Size | Protein |
|---|---|---|
| Chicken breast (cooked) | 100 g | 31 g |
| Lean beef (cooked) | 100 g | 26 g |
| Salmon | 100 g | 22 g |
| Tuna (canned) | 1 can (140 g) | 25 g |
| Whole egg | 1 large | 6 g |
| Greek yogurt (plain) | 170 g cup | 17 g |
| Cottage cheese | 100 g | 11 g |
| Whey protein powder | 1 scoop (30 g) | 24 g |
Plant‑Based Sources
| Food | Serving Size | Protein |
|---|---|---|
| Tofu (firm) | 100 g | 15 g |
| Tempeh | 100 g | 19 g |
| Lentils (cooked) | 1 cup | 18 g |
| Chickpeas (cooked) | 1 cup | 15 g |
| Soybeans (edamame) | 1 cup | 17 g |
| Quinoa (cooked) | 1 cup | 8 g |
| Almonds | 30 g (handful) | 6 g |
| Pea protein powder | 1 scoop (30 g) | 22 g |
Why Protein Matters So Much
- Muscle building & repair — Protein supplies amino acids your body uses to rebuild muscle fibres after training.
- Fat loss — Higher protein intake preserves lean mass while dieting and increases satiety, making calorie restriction easier.
- Healthy aging — Adults over 50 lose 1–2% of muscle mass per year without sufficient protein and resistance training.
- Immune function — Antibodies are made of protein; deficiency weakens immunity.
- Hormone & enzyme production — Many hormones (insulin, glucagon) and digestive enzymes are protein‑based.
- Stronger bones — Adequate protein, paired with calcium, supports bone density into old age. See the National Osteoporosis Foundation for more.
Common Protein Mistakes
- Eating too little protein at breakfast — Most people front‑load carbs and back‑load protein. Aim for 25–40 g per meal starting from breakfast.
- Relying only on protein bars and shakes — Whole foods deliver more nutrients and keep you fuller longer.
- Underestimating portion sizes — A “chicken breast” is often closer to 200 g cooked (≈ 60 g protein), not the 100 g serving on nutrition labels.
- Skipping protein on rest days — Muscle recovery continues for 48 hours; consistent daily intake matters more than peri‑workout timing.
- Fearing “too much protein” damages kidneys — In healthy adults, high‑protein diets (up to 3 g/kg) show no kidney harm in studies. People with existing kidney disease should consult a doctor.
Frequently Asked Questions
What is a protein calculator?
A protein calculator is a free online tool that estimates your daily protein requirement based on body weight, age, sex, activity level, and fitness goal. It returns grams per day, grams per meal, a safe intake range, and food equivalents.
How much protein do I need per day?
For sedentary adults, 0.8 g per kg of body weight meets the RDA. Most active people benefit from 1.2–2.2 g per kg, with the higher end recommended for those losing fat or building muscle.
Can I eat too much protein?
In healthy adults, intakes up to 2.2 g/kg (and even higher in athletes) are well tolerated. People with chronic kidney disease should consult a doctor before raising protein intake.
Is plant protein as good as animal protein?
Yes — when you combine sources to get all essential amino acids. Soy, quinoa, and pea protein are complete proteins on their own. Eating a variety of beans, grains, nuts, and tofu easily meets needs on a vegan diet.
Do I need protein shakes?
No — they’re a convenient supplement, not a requirement. If you can hit your daily target from whole foods, shakes aren’t necessary. They simply make high‑protein diets easier and more affordable.
Should I eat protein before or after workouts?
The “anabolic window” is far wider than once thought — eating protein within 1–2 hours before or after training is fine. Total daily intake matters more than precise timing.
Does the calculator store my data?
No. All calculations happen locally in your browser. Your weight, age, sex, and goal are never stored, shared, or sent to a server.
How often should I recalculate my protein needs?
Recalculate any time your weight changes by 3–5 kg, your activity level shifts, or you switch goals (e.g., from cutting to bulking).
External Resources
- National Institutes of Health (NIH) — Authoritative guidance on the Recommended Dietary Allowance (RDA) for protein and other nutrients.
- Academy of Nutrition and Dietetics — Find a registered dietitian and read evidence‑based articles on protein, sports nutrition, and special diets.
- How Much Protein Do You Need? – Examine.com — Independent, research‑based deep dive into protein requirements across populations.
- Protein (Nutrient) – Wikipedia — Comprehensive overview of dietary protein, amino acids, and metabolism.
- Plant‑Based Protein – Vegan Society — Detailed guidance on getting complete protein from plant sources.