Protein Intake Calculator: Find Out How Much Protein You Need Daily

Quick Answer

Most adults need 0.8–2.2g of protein per kg of body weight per day, depending on activity level and goals. Sedentary adults need around 0.8g/kg. Active individuals need 1.2–1.6g/kg. Those building muscle or losing weight need 1.6–2.2g/kg. Use the free daily protein intake calculator above to get your exact number in 30 seconds.

What is a daily protein intake calculator?

A daily protein intake calculator is a free online tool that estimates how many grams of protein you need each day based on your body weight, age, gender, activity level, and fitness goal. It uses the scientifically validated Mifflin-St Jeor equation to calculate your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE), then applies a protein multiplier matched to your specific goal.

If you have ever wondered “how much protein do I actually need?” — you are not alone. It is one of the most searched nutrition questions in the world, and the answer is different for every person.

The problem with generic advice is that 0.8g per kg per day — the most quoted number — is the bare minimum to prevent deficiency. It is not the number that helps you build muscle, lose fat, or perform at your best.

This guide explains exactly how a daily protein intake calculator works, what number you should actually be aiming for, and how to hit it every day without obsessing over every meal. We cover everything from the science behind the formula to a full protein-by-weight reference table, a protein-by-goal comparison, and the most common mistakes people make with their protein intake.

How Much Protein Do You Need Per Day?

Your daily protein requirement depends on four key variables: your body weight, your age, your activity level, and your primary goal. There is no single correct number for everyone.

According to the World Health Organization, the minimum safe protein intake for healthy adults is 0.83g per kg of body weight per day. However, research published in the Journal of the International Society of Sports Nutrition (2017) consistently shows that intakes of 1.4–2.0g/kg produce significantly better outcomes for physically active adults — including better muscle preservation, improved satiety, and enhanced body composition.

Answer: The optimal daily protein intake for most adults is 1.2–2.2g per kg of body weight, depending on activity and goal. The widely quoted RDA of 0.8g/kg is a minimum threshold — not a performance target. For a 70kg moderately active person aiming to maintain weight, approximately 84–112g of protein per day is appropriate.

Daily Protein Intake by Body Weight (Quick Reference Table)

Use this table as a starting reference. For a personalized target, use our protein intake calculator, which factors in your age, activity level, and specific goal.

Body Weight	Sedentary (0.8g/kg)	Active (1.4g/kg)	Muscle Gain (1.8g/kg)	Fat Loss (2.0g/kg)
50 kg	40g	70g	90g	100g
60 kg	48g	84g	108g	120g
70 kg	56g	98g	126g	140g
80 kg	64g	112g	144g	160g
90 kg	72g	126g	162g	180g
100 kg	80g	140g	180g	200g
110 kg	88g	154g	198g	220g

How Does the Daily Protein Intake Calculator Work?

Our daily protein intake calculator uses a three-step process to determine your exact requirement:

Step 1 — Calculate Basal Metabolic Rate (BMR)

BMR is the number of calories your body needs at complete rest — just to keep your organs functioning. We use the Mifflin-St Jeor equation, considered the gold standard by the American College of Sports Medicine:

Men: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5
Women: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 161

Step 2 — Calculate Total Daily Energy Expenditure (TDEE)

Your TDEE multiplies BMR by your activity factor to account for how much you move each day:

Activity Level	Description	Multiplier
Sedentary	Little or no exercise	× 1.2
Lightly Active	3–5 days of exercise/week	× 1.375
Moderately Active	6–7 days of hard exercise	× 1.55
Very Active	6–7 days hard exercise	× 1.725
Extra Active	Physical job or twice/day training	× 1.9

Step 3 — Apply the Protein Multiplier for Your Goal

Your protein target is then calculated by multiplying your body weight in kg by a factor that matches your goal:

• Maintain weight: 1.0–1.2g per kg
• Lose fat: 1.8–2.2g per kg (higher protein preserves muscle during a deficit)
• Build muscle: 1.6–2.0g per kg
• Athletic performance: 1.6–2.2g per kg

Answer: A daily protein intake calculator works by combining your BMR, TDEE, and goal into a single protein target in grams. The Mifflin-St Jeor equation is the most accurate formula for this calculation — used by sports dietitians and the American College of Sports Medicine worldwide.

Protein Needs by Goal: A Complete Comparison

Different goals require meaningfully different protein targets. Here is how they compare and why:

Goal	Protein Target	Why This Amount	Calculator
General Health	0.8–1.0g/kg	Meets RDA minimum; prevents deficiency	Protein Calculator
Weight Loss	1.8–2.2g/kg	Preserves muscle, increases satiety, boosts thermic effect	Weight Loss Calculator
Muscle Gain	1.6–2.0g/kg	Maximises muscle protein synthesis; ISSN-supported range	Muscle Gain Calculator
Bodybuilding	1.8–2.2g/kg	Maximizes muscle protein synthesis; ISSN-supported range	Bodybuilding Calculator
Keto Diet	1.4–1.8g/kg	Higher demands from frequent, intense training sessions	Keto Calculator
Vegetarian / Vegan	1.2–1.8g/kg	Moderate protein prevents gluconeogenesis, disrupting ketosis	Vegetarian Calculator

Protein Requirements by Age Group

Protein needs change significantly across the lifespan. Children need protein for growth. Older adults need more protein to counteract the natural loss of muscle mass (sarcopenia) that begins in the mid-30s.

Age Group	Recommended Daily Protein	Key Reason
Children (1–8 yrs)	13–19g/day	Rapid growth and development
Teens (9–18 yrs)	34–59g/day	Puberty, muscle development, bone density
Adult Women (19–50)	46–75g/day	Puberty, muscle development, and bone density
Adult Men (19–50)	56–91g/day	Maintenance: higher with exercise
Adults 50–65	1.0–1.2g/kg	Counteract early anabolic resistance
Seniors 65+ yrs	1.2–1.6g/kg	Prevent sarcopenia, maintain function
Pregnancy	+25g above baseline	Fetal growth, placental development

For age-specific calculators, use our protein calculator for seniors, protein calculator for teens, and pregnancy protein calculator.

What Are the Best High-Protein Foods to Hit Your Daily Target?

Knowing your protein number is only half the battle — hitting it daily with real food is the other half. Here are the highest-quality protein sources ranked by protein content and bioavailability:

Food	Serving	Protein (g)	Calories	Best For
Chicken Breast	100g	31g	165	All goals
Tuna (canned)	100g	29g	109	Fat loss
Lean Beef	100g	26g	215	Muscle gain
Greek Yogurt (0%)	170g	17g	100	Snacks, breakfast
Whole Eggs	2 large	13g	143	Complete amino acid profile
Lentils (cooked)	1 cup	18g	230	Plant-based
Cottage Cheese	1/2 cup	14g	90	Before bed (casein)
Tempeh	100g	19g	193	Vegan muscle gain
Whey Protein	1 scoop (30g)	24g	120	Post-workout

For a complete breakdown of protein content in specific foods, see our protein per calorie chart and our high protein food planner.

Protein Intake for Men vs Women: Is There a Difference?

Yes, but the difference is primarily driven by body weight and muscle mass rather than gender itself. Men typically weigh more and carry more muscle mass, which means their absolute protein requirement is higher. However, the ratio of protein per kg of body weight is the same regardless of gender.

How Much Protein Do Men Need Per Day?

A moderately active 80kg man needs approximately 96–160g of protein per day, depending on his goal. Use our protein intake calculator for men for a personalized target.

How Much Protein Do Women Need Per Day?

A moderately active 60kg woman needs approximately 72–120g of protein per day. Women often underestimate their protein needs, particularly during weight loss when muscle preservation is critical. Use our protein intake calculator for women to find your number. For pregnancy-specific needs, see our pregnancy protein calculator.

Answer: Men and women have the same protein-per-kg requirements — the difference in absolute grams comes from differences in body weight and muscle mass. A 60kg woman needs as much protein relative to her weight as an 80kg man. The key is calculating based on your own body weight, not following a generic number.

How to Hit Your Daily Protein Target: Practical Strategies

Spread Protein Across 3–5 Meals

Research published in the Journal of the International Society of Sports Nutrition shows that muscle protein synthesis is maximised at 20–40g of protein per meal. Spreading your daily intake across meals is significantly more effective than eating most of it in one sitting. If your target is 150g, aim for 37-38g across four meals.

For a complete guide to planning meals around your target, explore our 7-day high protein meal plan or use our protein per meal calculator.

Front-Load Protein at Breakfast

Most people eat very little protein at breakfast and too much at dinner. In practice, starting your day with 30–40g of protein (eggs, Greek yogurt, cottage cheese, protein shake) makes hitting your daily target far easier and controls hunger throughout the day.

Use a Protein Shake to Fill Gaps — Not as a Foundation

Protein supplements are a tool, not a replacement for whole food. Whole food proteins come with additional micronutrients, better satiety, and slower absorption. Use our protein shake builder to find the right supplement for your remaining daily gap after whole foods. To learn how to reach specific targets through food, see our guides on how to eat 140 grams of protein a day and how to eat 120 grams of protein a day.

5 Common Protein Intake Mistakes to Avoid

• Using the RDA (0.8g/kg) as your target if you exercise. The RDA is the minimum to prevent deficiency in sedentary adults — not a performance goal. Most active people need 50–150% more than the RDA.
• Eating all your protein in one meal. Your body can absorb all the protein you eat, but muscle protein synthesis peaks at 20–40g per meal. Eating 150g in one sitting is significantly less effective than 40g across four meals.
• Counting protein from low-quality, incomplete sources only. Plant proteins have lower bioavailability. If you are vegetarian or vegan, aim for the higher end of the range and combine different plant protein sources throughout the day.
• Not recalculating as your weight changes. Protein targets are based on current body weight. If you lose 10kg, your requirement decreases. Recalculate every 4–6 weeks during a weight loss phase.
• Ignoring protein deficiency signs. Fatigue, slow wound healing, frequent illness, hair loss, and muscle loss are all signs of insufficient protein intake. Use our protein deficiency checker if you are experiencing these symptoms.

Pro Tips for Optimizing Your Daily Protein Intake

• Eat 30–40g of protein at your first meal of the day. This sets the leucine threshold for muscle protein synthesis early and controls hunger hormones for the rest of the day.
• Add protein to every snack. Replace biscuits or crisps with Greek yogurt, cottage cheese, boiled eggs, or a handful of nuts. This adds 10–20g of protein to your day with minimal effort.
• Have casein protein before bed. Cottage cheese or a casein supplement before sleep provides slow-releasing amino acids throughout the night, supporting overnight muscle recovery.
• Track protein for 2–4 weeks to calibrate. You do not need to track forever, but 2–4 weeks of tracking teaches you the protein content of your regular meals, so you can estimate accurately going forward. Our guide to protein absorption explains what happens to excess protein at each meal.
• Cook in bulk and portion protein sources. Meal-prepping chicken breast, hard-boiled eggs, or lentils at the start of the week removes daily decision fatigue and ensures you always have high-protein food available.

Bottom Line

The most important thing to understand about your daily protein intake is that one number does not fit everyone. The RDA of 0.8g/kg is a survival minimum — not a performance target. Most active adults benefit significantly from 1.2–2.2g of protein per kg of body weight per day, depending on their goal. Use our daily protein intake calculator to find your exact number, then build your meals around that target with the high-protein food sources above. Recalculate every 4–6 weeks as your weight and activity level change.

Frequently Asked Questions

How much protein do I need per day?

Most healthy adults need 0.8–1.2g of protein per kg of body weight per day for general health. Active individuals need 1.2–2.0g/kg. Athletes and those building muscle need 1.6–2.2g/kg. Use our daily protein intake calculator to get your exact personalised number.

How does a daily protein intake calculator work?

It uses the Mifflin-St Jeor equation to calculate your Basal Metabolic Rate (BMR), multiplies it by your activity level to get your TDEE, then applies a protein multiplier based on your goal — typically 1.0–2.2g per kg of body weight.

How much protein do I need to build muscle?

The International Society of Sports Nutrition recommends 1.6–2.2g of protein per kg of body weight per day for muscle gain. For a 75kg person, that is 120–165g daily. Use our protein calculator for muscle gain for a specific target.

How much protein do I need to lose weight?

For weight loss, 1.8–2.2g/kg is the research-supported target. Higher protein during a calorie deficit preserves lean muscle, increases satiety, and boosts your thermic effect of food. See our protein calculator for weight loss for your personalized number.

What is the RDA for protein?

The Recommended Dietary Allowance (RDA) for protein is 0.8g per kg of body weight per day for sedentary healthy adults. This is the minimum required to prevent deficiency — not the optimal intake for active individuals or those with fitness goals.

How much protein can the body absorb in one meal?

The body can absorb all the protein you eat, but muscle protein synthesis is maximized at 20–40g per meal. Spreading your total daily protein across 3–5 meals produces significantly better results than eating it all at once. Read our full guide on how much protein your body can absorb at one time.

More Protein Calculators & Guides

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Disclaimer: This article is for informational purposes only and does not constitute medical advice. Protein requirements vary by individual health status. Consult a registered dietitian or healthcare professional before making significant changes to your diet, particularly if you have kidney disease, liver conditions, or other medical conditions where protein intake is a clinical factor.