Protein Calculator

Estimate how much protein you need each day based on your weight, activity, goal and life stage, with a per-meal split.

Informational only, not medical advice. Talk to a doctor.

How it works

Protein needs scale with body weight. The baseline Recommended Dietary Allowance is 0.8 g per kg for healthy, inactive adults.

Regular exercise, building muscle or losing fat raise the useful range, as research reviews suggest. Adults 65+ benefit from at least 1.0-1.2 g/kg.

Pregnancy (1.1 g/kg) and breastfeeding (1.3 g/kg) use the Institute of Medicine's recommendations.

Formula

protein (g/day) = weight (kg) × g/kg

Where:

weight
= Body weight in kilograms (lb ÷ 2.2046)
g/kg
= Range for your activity, goal and life stage

Worked example

A 70 kg (154 lb) adult who is sedentary and wants to maintain weight.

Protein = 70 × 0.8 = 56 g per day, about 19 g at each of three meals.

Balancing Protein Intake for Performance

Protein is essential for repairing tissues and supporting immune function, but the amount you need depends heavily on your metabolic demands and physical workload. Athletes and individuals engaging in resistance training require significantly more protein to support muscle protein synthesis and recovery compared to sedentary individuals. Distributing your intake evenly across breakfast, lunch, and dinner ensures a steady supply of amino acids, which is more effective than consuming one massive protein-heavy meal at night.

While whole food sources like lean meats, fish, and dairy are excellent, plant-based proteins such as lentils, chickpeas, and tofu are equally capable of meeting your requirements when combined thoughtfully. Those following a vegan or vegetarian diet should focus on consuming a variety of sources to ensure they obtain a complete profile of essential amino acids throughout the day. Diversifying your protein sources also provides a broader range of micronutrients and fiber.

Best Practices and Nutrient Misunderstandings

A common mistake is focusing exclusively on protein while neglecting the carbohydrates and healthy fats necessary for overall energy; without enough total calories, your body may use protein for fuel instead of tissue repair. Additionally, many people overestimate how much protein they can utilize in a single sitting, often consuming expensive supplements that provide more than the 30-40 grams the body typically processes for muscle building at once.

To get the most out of your diet, prioritize fiber-rich whole foods and use supplements only to fill gaps when whole meals aren't practical. Keep in mind that your protein needs may change as you age or if you are recovering from an injury. Consult with a nutritionist if you have specific medical conditions that require you to limit or monitor your protein intake closely.

Frequently asked questions

No. Beyond about 2.2 g/kg there's little extra benefit for muscle for most people. Extra protein is simply used for energy.

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For informational purposes only. This calculator does not provide medical advice. Consult a qualified professional before making decisions based on these results.