What is the best protein intake per day?

The ideal protein intake depends on your body weight, activity level, and goals. Most adults need between 0.8g and 2.2g of protein per kg of body weight daily. Sedentary adults need around 0.8g/kg while active individuals and athletes benefit from 1.6–2.2g/kg.

How much protein do I need for muscle gain?

For muscle gain, you typically need 1.6g to 2.2g of protein per kg of body weight along with consistent strength training. A 75kg person training 3–5 days per week should aim for 120–165g of protein daily to maximize muscle protein synthesis.

What are the best protein sources?

The best protein sources include chicken breast, eggs, dairy products like Greek yogurt and cottage cheese, fish, legumes, nuts, and high-quality protein supplements like whey protein. Animal proteins generally have a higher bioavailability and complete amino acid profile.

Is whey protein safe to use daily?

Yes, whey protein is safe for daily use for healthy adults when consumed within recommended limits and combined with a balanced diet. Most people tolerate 1–2 scoops per day without any adverse effects. Those with dairy allergies or kidney disease should consult a healthcare provider first.

Can protein help with weight loss?

Yes, protein helps with weight loss by reducing hunger, increasing metabolism through the thermic effect of food, and preserving lean muscle mass during a calorie deficit. A higher protein intake of 1.6–2.0g/kg is recommended during weight loss phases.

When is the best time to take protein?

The best time to take protein is within 1–2 hours after workouts to support muscle recovery. However, spreading protein evenly across 3–5 meals throughout the day is more important than timing alone. Consistent daily intake matters more than any specific window.

What is a good protein calculator for athletes?

A good protein calculator for athletes adjusts for training intensity, sport type, and muscle-building goals. It should use research-backed ranges — the ISSN recommends 1.6–2.2g of protein per kg of body weight per day for strength athletes. CalculatorProtein.com offers a dedicated protein calculator for muscle gain that uses these validated ranges. No signup or app download is needed.

Is 1 gram of protein per kg of body weight the right target?

No — 1g per kg is not enough for most active adults. The RDA of 0.8g per kg is the minimum to prevent protein deficiency, not the optimal for performance or muscle growth. Research published in the British Journal of Sports Medicine (2018) found that 1.6–2.2g per kg per day is optimal for muscle gain. For fat loss while preserving muscle, 1.8–2.4g per kg is recommended. Use a goal-specific protein calculator to get your accurate daily target.

How much protein do I need to build muscle?

To build muscle, most adults need 1.6–2.2 grams of protein per kilogram of body weight per day. For an 80kg person, that is between 128g and 176g of protein daily. Distribute this across 4–5 meals, with each meal providing at least 30g of protein and 2.5–3g of leucine to maximize muscle protein synthesis.

What is the difference between a protein calculator and a macro calculator?

A protein calculator focuses specifically on your daily protein target using sports nutrition formulas based on your weight, goal, and activity level. A macro calculator estimates your full breakdown of protein, carbohydrates, and fats based on a percentage split of your total calories. For accuracy, use a dedicated protein calculator first — macro calculators often underestimate protein for active individuals because they use generic percentage splits rather than weight-based research formulas.

Can I use this protein calculator without creating an account?

Yes. CalculatorProtein.com requires no account, no signup, and no app download. Enter your weight, activity level, and goal to get your personalized protein target instantly. Your data is not stored. The tool works on any device — desktop, tablet, or mobile — directly in your browser.

How does a protein calculator work?

A protein calculator takes your inputs — body weight, height, age, activity level, and goal — and applies a validated formula to estimate your optimal daily protein intake. Most tools use formulas derived from the Mifflin-St Jeor equation for energy needs, combined with protein multipliers from ISSN guidelines. The result is a goal-specific protein target in grams per day, adjusted for whether you are trying to gain muscle, lose fat, or maintain your current body composition.

How much protein per day do I need for weight loss?

For weight loss, a higher protein intake of 1.8–2.4g per kg of body weight per day is recommended to preserve lean muscle while in a calorie deficit. A 70kg person aiming for fat loss should target 126–168g of protein per day. High protein intake during calorie restriction reduces muscle loss, increases satiety, and has a higher thermic effect compared to carbohydrates or fat.

Is the protein calculator accurate for women?

Yes. Protein needs are calculated based on body weight and activity level — not gender alone. Women generally have lower absolute protein needs due to lower average body weight, but the per-kilogram recommendations are the same as for men. Active women aiming for muscle gain need 1.6–2.2g per kg, just like men. CalculatorProtein.com has a dedicated protein calculator for women that accounts for female-specific physiological factors including hormonal fluctuations and pregnancy.

Written by

Shady Elbody · Certified Nutrition Researcher & SEO Specialist

Founder, CalculatorProtein.com · LinkedIn · Last Updated: April 2026

Protein Calculator — Find Your Exact Daily Protein Intake

Protein Calculator Based on Weight, Activity, and Goals

Want to know how this calculator protein works? Read more in the About This Tool section

Gender

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Age (years)

Height Unit

CM Feet / Inches

Height (cm)

Height (Feet / Inches)

Feet

Inches

Weight Unit

KG LBS

Weight (kg)

Weight (lbs)

Activity Level

Goal

⚕️

Medical Disclaimer

Results are estimates only. This tool is for informational and educational purposes and does not constitute medical advice. Individual needs vary based on health status, age, and other factors. Always consult a qualified healthcare professional before making changes to your diet or nutrition plan.

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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.

Formula: Daily protein (g) = Body weight (kg) × Protein target (g/kg)

Worked Example

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 (Jäger et al., 2017, J Int Soc Sports Nutr) and a meta-regression of 49 resistance-training trials showing gains plateau near 1.6–2.2 g/kg/day (Morton et al., 2018, Br J Sports Med). Individual needs vary — see a registered dietitian for personalized guidance, especially with kidney disease, pregnancy, or other medical conditions.

How do I calculate my protein intake?

Multiply your body weight in kilograms by a gram-per-kilogram target that matches your goal: 0.8 g/kg covers the general RDA minimum, 1.2–1.7 g/kg suits active adults, and 1.6–2.2 g/kg is the research-backed range for muscle gain. For a 70 kg person aiming to build muscle, that's 70 × 1.6 to 70 × 2.2, or roughly 112–154 grams of protein per day. Use the calculator above to get your exact number instantly, or see the step-by-step formula above to do the math yourself.

What to Do With Your Protein Result

💡 You now have your daily protein target. But knowing the number is only step one — here is exactly what to do next to hit it every day and reach your goal faster.

Step 1 — Match Your Result to Your Goal

Your protein target changes slightly based on what you are trying to achieve. Find your goal below:

💪

Build Muscle

Aim for 1.6–2.2g per kg of body weight
Spread protein across 4–5 meals
Include protein within 2 hours of training
Use our protein calculator for muscle gain for a precise target

🔥

Lose Weight

Aim for 1.2–1.6g per kg to preserve muscle
High-protein meals reduce hunger by up to 35%
Prioritize low-calorie, high-protein foods
See our protein calculator for weight loss

⚖️

Maintain & Stay Healthy

Minimum 0.8g per kg per day (RDA)
Focus on consistent daily intake
Whole food sources preferred
Check protein per kg body weight guide

Step 2 — Turn Your Target Into a Daily Plan

Divide your target into meals. Split your daily protein goal across 4–5 meals. For example, if your target is 160g — aim for ~32–40g per meal. This maximizes muscle protein synthesis throughout the day.
Pick high-protein foods you actually enjoy. Chicken breast, eggs, Greek yogurt, lentils, and tuna are all excellent sources. See our top high-protein foods guide for a full ranked list.
Start tracking your intake. Use an app like Cronometer or MyFitnessPal. Log everything for at least 2 weeks until you know your typical meals by heart. Read our guide on how to track protein intake effectively.
Plan your biggest protein meal around your workout. Eating protein within 2 hours post-training significantly improves recovery and muscle growth. This is your most important protein window of the day.
Struggling to hit the number? Learn how to eat 120g of protein a day with practical meal ideas — or scale up from there once you get comfortable.

Step 3 — Best Times to Eat Protein Each Day

When you eat protein matters almost as much as how much you eat. Use this daily schedule as a guide:

Time of Day	Recommended Intake	Best Food Sources
Breakfast (7–9 AM)	30–40g	Eggs, Greek yogurt, cottage cheese, protein shake
Lunch (12–1 PM)	35–45g	Chicken breast, tuna, 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

✅ Pro Tip: Research published in the Journal of the International Society of Sports Nutrition (2017) confirms that spreading protein evenly across 4–5 meals produces significantly better muscle growth results than eating the same total protein in 1–2 large meals.

⚠️ Common mistake to avoid: Most people eat too little protein at breakfast and too much at dinner. This makes it harder for your body to use protein efficiently. Balance your meals throughout the day instead.

Want a More Specific Protein Target?

We have dedicated calculators for every goal and body type. Try the one that matches you best:

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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.