Protein is the most important macronutrient for body composition — yet most people either eat far too little or rely on generic recommendations that don’t account for their individual stats and goals. The commonly cited “0.8g per kg” guideline is the minimum to avoid deficiency, not the optimal amount for someone who exercises.

This calculator uses your weight, age, sex, activity level, and specific goal to generate a personalized daily protein target backed by current sports nutrition research. Whether you’re trying to lose fat, maintain your physique, or build muscle, your protein needs are different — and this tool accounts for that.

## How to Use This Calculator

Select your unit system, enter your weight and age, choose your sex and activity level, then select your primary goal — fat loss, maintenance, or muscle building. The calculator applies research-based protein multipliers to your lean body weight to generate your daily target, then breaks it down into a practical per-meal distribution.

## Understanding Your Protein Target

Protein recommendations vary significantly based on goal:

**Fat Loss (2.0g per kg):** During a calorie deficit, higher protein intake preserves muscle mass and keeps metabolism from slowing. It also has the highest satiety effect of any macronutrient, helping manage hunger.

**Maintenance (1.6g per kg):** Supports muscle repair, immune function, enzyme production, and steady body composition without excess.

**Muscle Building (2.2g per kg):** Maximizes muscle protein synthesis — the biological process behind muscle growth. Research consistently shows intakes at this level produce the best hypertrophy outcomes when combined with resistance training.

## How to Hit Your Daily Protein Target

Distribute protein across 3–4 meals rather than concentrating it in one sitting. Research shows muscle protein synthesis is maximized when protein is spread throughout the day, with each meal containing at least 20–40g.

**High-protein food sources per 100g:**

– Chicken breast: 31g

– Tuna (canned): 29g

– Cottage cheese: 11g

– Greek yogurt: 10g

– Eggs: 13g

– Salmon: 25g

– Lean beef: 26g

– Tofu (firm): 17g

– Lentils (cooked): 9g

## Frequently Asked Questions

**Is 2g of protein per kg too much?**

No — for active individuals, intakes of 1.6–2.2g per kg are well within the range supported by research and are considered safe for healthy adults. The idea that high protein damages kidneys applies only to people with pre-existing kidney disease.

**Does protein timing matter?**

Spreading protein across meals matters more than specific timing. However, consuming 20–40g of protein within a few hours of resistance training does support muscle protein synthesis — particularly a leucine-rich source like whey or eggs.

**Can I get enough protein without supplements?**

Yes — whole food sources can meet your target. However, most people find it practically easier to use a protein supplement for one meal or post-workout, especially at higher targets (180g+ per day).

**What happens if I don’t eat enough protein?**

On a calorie deficit without adequate protein, your body breaks down muscle tissue for energy. This slows your metabolism, reduces strength, and makes fat loss harder to sustain long-term.

**How much protein can the body absorb per meal?**

The “30g limit” is a myth. Your body can absorb all the protein you consume — the question is how much is used for muscle protein synthesis per sitting. Research suggests 40g per meal maximizes this response, but there’s no upper absorption limit.

**Does protein intake need to change as I age?**

Yes — older adults (50+) experience anabolic resistance, meaning they need more protein per meal to stimulate the same muscle protein synthesis response as younger people. Targets of 1.8–2.2g per kg are generally recommended for older active adults.

## Related Tools & Articles

→ [Calorie Deficit Calculator](/calorie-deficit-calculator/) — Combine your protein target with the right calorie deficit

→ [Fat Burn Zone Calculator](/fat-burn-zone-calculator/) — Optimize your cardio alongside your nutrition

→ [Best Protein Supplements](/best-protein-supplements/) — Our evidence-based guide to protein powders