How Much Protein Do I Need Per Day?
Use the Protein Calculator below — modify the values and click Calculate to get your daily protein needs in grams.
| Recommended daily protein | --- |
| Recommended range (min – max) | --- |
| Per meal — 3 meals a day | --- |
| Per meal — 4 meals a day | --- |
| Per kg of body weight | --- |
| Per lb of body weight | --- |
| Protein as % of daily calories | --- |
What Are Proteins?
Proteins are one of the three macronutrients that provide energy to the human body, alongside fats and carbohydrates. Unlike carbs and fats, protein’s main job is not energy — it is the building block of your body. Protein is required for the structure, function, and regulation of your tissues and organs, including muscles, skin, hair, nails, enzymes, and hormones.
Proteins are made up of 20 different amino acids. Your body can synthesize most of them on its own, but nine are essential amino acids that must come from food. Foods that provide all nine essential amino acids are called complete proteins — these include meat, poultry, fish, eggs, dairy, and soy. Plant foods such as beans, lentils, nuts, and whole grains are incomplete proteins, but eating a variety of them across the day easily covers all essential amino acids.
How Much Protein Do I Need?
Daily protein requirements depend on your body weight, activity level, age, and goals. The most common method estimates protein needs in grams per kilogram of body weight (g/kg) or grams per pound (g/lb):
| Situation | Protein per kg body weight | Protein per lb body weight |
|---|---|---|
| Minimum to avoid deficiency (RDA) | 0.8 g/kg | 0.36 g/lb |
| Sedentary adult | 0.8–1.0 g/kg | 0.36–0.45 g/lb |
| Lightly active (1-3 workouts/week) | 1.0–1.2 g/kg | 0.45–0.55 g/lb |
| Moderately active (4-5 workouts/week) | 1.2–1.6 g/kg | 0.55–0.73 g/lb |
| Active / intense training | 1.4–1.8 g/kg | 0.64–0.82 g/lb |
| Very active / athletes | 1.6–2.0 g/kg | 0.73–0.91 g/lb |
| Building muscle or losing fat | 1.6–2.2 g/kg | 0.73–1.0 g/lb |
| Adults over 60 | 1.2–1.6 g/kg | 0.55–0.73 g/lb |
For weight loss, higher protein (1.6–2.2 g/kg) helps preserve muscle mass and increases fullness. For muscle gain, research consistently shows 1.6–2.2 g/kg paired with resistance training maximizes muscle growth. The calculator above applies these ranges and adjusts for your age and goal automatically.
RDA of Protein by Age
The Recommended Dietary Allowance (RDA) is the minimum amount needed to stay healthy, not the optimal amount for active people. The official US recommendations by age are:
| Age Group | Protein Needed (grams/day) |
|---|---|
| Age 1 - 3 | 13 g |
| Age 4 - 8 | 19 g |
| Age 9 - 13 | 34 g |
| Age 14 - 18 (Girls) | 46 g |
| Age 14 - 18 (Boys) | 52 g |
| Age 19+ (Women) | 46 g |
| Age 19+ (Men) | 56 g |
How Is Protein Calculated?
The formula is simple: daily protein (grams) = body weight (kg) × protein factor (g/kg).
- Convert your weight to kilograms if needed: weight in pounds ÷ 2.205 = weight in kg.
- Choose your protein factor based on the table above (0.8–2.2 g/kg depending on activity and goal).
- Multiply the two numbers. Example: a 79 kg adult aiming to build muscle at 1.6 g/kg needs 79 × 1.6 = 126 g of protein per day.
Example with our calculator: a 175 lb (79 kg) moderately active man who wants to build muscle gets about 130 g/day — the calculator also shows the recommended range, a per-meal split, and the percentage of daily calories protein should represent.
Foods High in Protein
Protein appears in a wide range of foods. Animal sources are complete proteins, while plant sources can easily cover your needs when combined. Here are common foods with their approximate protein content:
| Food | Serving | Protein |
|---|---|---|
| Chicken breast (cooked) | 4 oz | 35 g |
| Greek yogurt (plain) | 1 cup | 23 g |
| Cottage cheese | 1 cup | 28 g |
| Eggs | 1 large | 6 g |
| Tuna (canned, drained) | 3 oz | 22 g |
| Lean beef (cooked) | 4 oz | 28 g |
| Salmon (cooked) | 3 oz | 22 g |
| Milk | 1 cup (8 oz) | 8 g |
| Shrimp (cooked) | 3 oz | 20 g |
| Tofu | ½ cup | 10 g |
| Lentils (cooked) | 1 cup | 18 g |
| Black beans (cooked) | 1 cup | 15 g |
| Peanut butter | 2 tbsp | 8 g |
| Almonds | ¼ cup | 7 g |
| Quinoa (cooked) | 1 cup | 8 g |
| Whey protein powder | 1 scoop | 24 g |
Vegans and vegetarians can meet their protein targets with soy products (tofu, tempeh, edamame), legumes, quinoa, hemp and chia seeds, and peanut butter — combining different plant proteins across the day ensures you get all essential amino acids.
How to Hit Your Daily Protein Target
- Divide your target across 3-4 meals. Your results show a per-meal number — hitting roughly that amount at each meal keeps muscle protein synthesis active all day.
- Prioritize protein at breakfast. Many people fall short of their target by eating most protein at dinner. Aim for 25-40 g at breakfast.
- Choose high-protein snacks: Greek yogurt, cottage cheese, hard-boiled eggs, jerky, nuts, or a protein shake.
- Use a kitchen scale for accuracy when counting grams — eyeballing portions typically overestimates by 25-50%.
- Supplement only if needed. A whey or plant protein shake is a convenient way to close the gap, but whole foods should come first.
- Spread it out. Your body uses protein most efficiently when intake is spread over the day rather than eaten in one sitting.
Protein & Weight Loss
Protein is the single most important macronutrient during weight loss. It preserves muscle mass while you cut calories, increases satiety (protein is the most filling macronutrient), and has a higher thermic effect — your body burns about 20-30% of protein calories just digesting it. When losing weight, aim for the higher end: 1.6–2.2 g/kg of body weight. Many people on GLP-1 medications such as Ozempic, Wegovy, Mounjaro, or Zepbound use a protein calculator to protect muscle while appetite is suppressed — the same high-protein rules apply. For your calorie deficit target, pair this with our Calorie Calculator.
FAQ
Most adults need 0.8 g of protein per kg of body weight (0.36 g/lb) as a minimum. Active people, anyone losing weight, and anyone building muscle should aim for 1.6-2.2 g/kg (0.73-1.0 g/lb). For a 150 lb (68 kg) person, that is roughly 50-150 g per day depending on activity and goals. Use the calculator above for your personalized number.
The standard formula is: body weight in kg × a protein factor. Multiply your weight in kg by 0.8 (minimum), 1.2-1.6 (active), or 1.6-2.2 (weight loss or muscle gain). Example: 70 kg × 1.6 = 112 g per day. The protein calculator above does this automatically and adjusts for age, activity, and your goal.
During weight loss, keep protein high — 1.6-2.2 g per kg of body weight (0.73-1.0 g/lb) — to preserve muscle mass, stay full, and keep your metabolism up. In a calorie deficit your body would otherwise burn muscle along with fat. A 180 lb (82 kg) person in a deficit should target roughly 130-180 g of protein per day.
Research shows 1.6-2.2 g per kg of body weight (0.73-1.0 g/lb) per day is the sweet spot for muscle growth when combined with resistance training — more than 2.2 g/kg provides little additional benefit. Spread it across 3-4 meals with 25-40 g per meal, and pair it with a slight calorie surplus. Use our Macros Calculator to build the full carb and fat plan around it.
For healthy people, high protein intake is safe. The excess is used for energy or stored as fat, not "turned into muscle." Very high intakes (above ~2.5 g/kg) offer no added benefit and can crowd out other nutrients. People with kidney disease should follow their doctor's guidance, since damaged kidneys work harder to clear protein byproducts.
Yes. Legumes, tofu, tempeh, edamame, lentils, quinoa, nuts, seeds, and whole grains all provide protein. Plant proteins are incomplete individually, but eating a variety throughout the day covers all nine essential amino acids. Vegetarians can add eggs and dairy; vegans can rely on soy, legumes, and plant protein powders to hit 1.6 g/kg or higher without difficulty.
What matters most is your total daily intake and consistency — not precise timing. Having protein within a few hours after training supports recovery, and a small amount before (or a meal containing protein within the day) works equally well. For most people, the "anabolic window" spans the whole day, so hit your daily target with 25-40 g per meal.
Yes. Starting around age 50-60, the body becomes less efficient at using protein and muscle loss (sarcopenia) accelerates. Experts recommend 1.2-1.6 g/kg (0.55-0.73 g/lb) for adults over 60 — roughly 50% more than the standard RDA — to maintain strength and independence. The calculator automatically raises your target if you are 60 or older.
Free Online Calculators
Protein Cheat Sheet
| Food | Protein |
|---|---|
| Chicken breast (4 oz) | 35 g |
| Greek yogurt (1 cup) | 23 g |
| Tuna (3 oz) | 22 g |
| Egg (1 large) | 6 g |
| Milk (1 cup) | 8 g |
| Tofu (½ cup) | 10 g |
| Lentils (1 cup) | 18 g |
| Peanut butter (2 tbsp) | 8 g |
Quick rule: Most adults need 0.8 g/kg minimum; active people and those building muscle should aim for 1.6-2.2 g/kg.
Daily Protein Tips
- Spread protein across 3-4 meals for best results.
- Aim for 25-40 g at breakfast — most people undereat protein in the morning.
- Protein is the most filling macronutrient — great for weight loss.
- Keep a high-protein snack (Greek yogurt, eggs, jerky) handy.
- Pair higher protein with strength training to build and keep muscle.
Related Tools
- Calorie Calculator — your daily calorie target.
- Macros Calculator — protein, carbs & fat split.
- BMI Calculator — check your weight category.
- Body Fat Calculator — lean mass estimate.
- Water Intake Calculator — daily hydration needs.