How Much Protein Should I Eat Per Day? Guide & Calculator

Chances are someone in your life has told you to eat more protein—and maybe gave you a number that sounded either suspiciously low or absurdly high. The confusion isn’t your fault. Recommendations shift depending on who you ask, whether you’re looking at a sedentary adult or someone training for a marathon, and which country’s guidelines you’re reading.

RDA for adults: 0.8 g per kg body weight ·
Sedentary example (70 kg): 56 g per day ·
Active athletes max: 1.8 g per kg body weight ·
UK BHF recommendation: 0.75 g per kg ·
Harvard RDA per pound: 0.36 g

Quick snapshot

1Confirmed facts

• Global RDA is 0.8 g/kg/day for healthy adults (Harvard Health)
• EFSA sets PRI at 0.83 g/kg, AR at 0.66 g/kg (EU Knowledge4Policy)
• Long-term safe ceiling is 2 g/kg/day (PubMed)

2What’s unclear

• Optimal intake for elite athletes without individual testing
• Precise protein needs during pregnancy and lactation
• Long-term effects of sustained intake above 2 g/kg

3Timeline signal

• EFSA first set AR/PRI standards in 2012
• DGE updated age-based guidelines in 2019
• NNR revised recommendations in 2023

4What’s next

• Your weight and goal set your number—here’s how to find it
• Age adjusts the baseline upward after 65
• Activity level is the biggest variable

These figures span the most widely cited global standards, from the US RDA to European and Nordic benchmarks.

Label	Value
RDA (sedentary)	0.8 g/kg
Athlete range	1.2–1.8 g/kg
70 kg sedentary	56 g/day
Excess risk threshold	>2 g/kg long-term
Egg protein (1 large)	6 g
EFSA PRI	0.83 g/kg
EU upper safe limit	3.5 g/kg
DGE over-65	1.0 g/kg

How should I calculate how much protein I need?

The starting point is the Recommended Dietary Allowance (RDA): 0.8 grams of protein per kilogram of body weight per day for healthy adults. According to Harvard Health, the RDA represents the minimum amount needed to prevent deficiency—not a target for optimal health. For a 70 kg adult, that works out to 56 grams daily.

RDA baseline

• The RDA is based on nitrogen balance studies showing 0.8 g/kg prevents deficiency in minimally active adults (PubMed)
• US and Canadian guidelines set this at 46g for women and 54g for men, or approximately 0.8 g/kg (Arla Foods Ingredients)
• The American Heart Association confirms this RDA for adults aged 18 and older (American Heart Association)

Adjust for activity level

Activity level is where the baseline shifts most dramatically. According to Holland & Barrett, athletes may need between 1.2 and 2 grams per kilogram daily, depending on training intensity. Research from PubMed suggests 1.0 g/kg for minimal activity, 1.3 g/kg for moderate activity, and 1.6 g/kg for intense training. UC Davis notes that strength athletes typically require 1.4–1.8 g/kg.

Use body weight multipliers

The simplest formula: multiply your body weight in kilograms by the appropriate multiplier for your goal. Sedentary adults multiply by 0.8. Those building muscle multiply by 1.6–2.2. Weight-loss goals typically fall between 1.2 and 1.6 g/kg to preserve lean mass while creating a calorie deficit.

The implication: a single multiplier doesn’t fit everyone. Your goal, age, and activity frequency all adjust the number upward from the baseline.

How much protein does a 70 kg person need?

Working backward from the numbers, a 70 kg sedentary adult needs 56 grams of protein per day at the baseline RDA. This aligns with the American Heart Association’s example for a 70 kg person. For someone training for muscle gain at the same weight, the target rises to 112–154 grams daily.

Sedentary calculation

• 70 kg × 0.8 g/kg = 56 g/day (American Heart Association)
• Mayo Clinic uses 75 kg as a sedentary example, calculating 60 grams daily
• UK reference intake for men is 56g (based on approximately 75 kg body weight) (British Nutrition Foundation)

Muscle building needs

For 70 kg individuals focused on muscle gain, multiply by 1.6–2.2 g/kg. That yields 112–154 grams daily. According to fitness calculators from ATHLEAN-X, 1 gram per pound of body weight (2.2 g/kg) is a commonly cited target for those training 3–5 days per week with an hour or more of daily exercise.

Weight loss adjustments

When cutting calories, protein preserves muscle mass. MD Anderson recommends 1.2–1.5 g/kg for active individuals, which translates to 84–105 grams for a 70 kg person engaged in weight loss.

Is 100g of protein a lot per day?

For most adults, 100 grams of protein daily falls within a reasonable—and generally safe—range. The Mayo Clinic notes that this amount is not excessive for active individuals. For a sedentary 70 kg adult, it exceeds the RDA. For a 100 kg athlete, it might barely cover minimum needs.

For average adult

The American Heart Association suggests protein should comprise 10–35% of daily calories. At 2,000 calories, that allows 50–175 grams. At 2,500 calories, the range shifts to 62.5–218 grams. So 100 grams sits comfortably in the middle for most caloric intakes.

For athletes

Athletes training 1+ hours daily may need 1.6–2.2 g/kg, which for an 80 kg athlete requires 128–176 grams. At that level, 100 grams would fall short of optimal recovery needs, according to UC Davis Nutrition.

Risks of excess

Long-term intake above 2 g/kg per day may strain kidneys in susceptible individuals, though PubMed research establishes 2 g/kg as safe for healthy adults and 3.5 g/kg as the tolerable upper limit. The EU Knowledge4Policy portal confirms that consuming twice the PRI (around 1.66 g/kg) is considered safe.

The pattern: 100 grams sits comfortably within safe limits for most adults but can fall short for larger or highly active individuals.

How much protein to build muscle?

Muscle protein synthesis requires a surplus above the baseline RDA. The evidence points to 1.6–2.2 grams per kilogram of body weight daily for those seeking hypertrophy. Below that range, the body lacks sufficient amino acids to fully repair and grow muscle tissue after resistance training.

Per kg recommendations

• Maintenance: 1.0–1.2 g/kg
• Hypertrophy (muscle gain): 1.6–2.2 g/kg (Holland & Barrett)
• Elite athlete range: up to 2.5 g/kg in specific cases
• Strength athletes: 1.4–1.8 g/kg per UC Davis Nutrition

Timing and sources

Total daily intake matters more than precise timing, but spreading protein across 3–5 meals improves absorption. Complete protein sources—meat, fish, eggs, dairy, and soy—deliver all essential amino acids. Plant-based combinations require attention to complementary amino acids.

Evidence from studies

Nitrogen balance studies, as cited in PubMed, show that protein synthesis peaks when intake reaches 1.6 g/kg in trained individuals. The Nordic Nutrition Recommendations from 2023 support similar ranges for active adults.

What are 5 signs you need more protein?

While blood tests confirm deficiency definitively, several symptoms commonly indicate insufficient protein intake. These signs often fly under the radar because they develop gradually and overlap with other causes.

Physical symptoms

• Hair, skin, and nail deterioration: Protein deprivation shows in fragile hair, skin dryness, and brittle nails. Keratin—the protein in hair—requires consistent amino acid supply.
• Slow wound healing: Tissue repair depends on collagen and immune proteins. Wounds taking longer than expected may signal inadequate substrate.
• Muscle loss: The body catabolizes muscle tissue when amino acid intake fails to meet demands, leading to progressive weakness and reduced lean mass.

Performance indicators

• Persistent fatigue: Hemoglobin is a protein. Insufficient intake compromises oxygen transport, leaving you tired even with adequate sleep.
• Slow recovery after exercise: Muscle soreness lingering beyond 48–72 hours often reflects under-repaired tissue rather than simply intense training.
• Cravings, especially for carbohydrates: Insufficient protein can drive hunger and cravings as the body seeks quick energy from sugars.

When to increase

If two or more of these signs apply, consider bumping protein intake by 0.2–0.4 g/kg and monitoring over 4–6 weeks. For anyone with underlying health conditions, MD Anderson recommends consulting a dietitian before making significant changes.

The implication: the body signals shortfall through physical and performance markers long before a blood test confirms it.

Regional differences in protein recommendations

Three standards dominate the global landscape. The US and Canada use 0.8 g/kg. The EU, via EFSA, sets the Population Reference Intake at 0.83 g/kg and Average Requirement at 0.66 g/kg. Nordic guidelines from 2023 align closely with the EU at 0.83 g/kg for adults, but note that older adults may need 1.2–1.5 g/kg to maintain lean mass.

Germany’s DGE guidelines separate age groups: 0.8 g/kg for adults under 65, increasing to 1.0 g/kg for those over 65. According to EU Knowledge4Policy, these updates reflect growing evidence that elderly individuals synthesize muscle protein less efficiently and benefit from higher intake.

The RDA is the amount of a nutrient you need to meet your basic nutritional requirements. In a sense, it’s the minimum amount you need to keep from getting sick—not the specific amount you are supposed to eat every day.

— Harvard Health (Medical Publication)

Long-term consumption of protein at 2 g per kg BW per day is safe for healthy adults, and the tolerable upper limit is 3.5 g per kg BW per day.

— PubMed Researchers (Scientific Review)

For anyone tracking macros, the math is straightforward: identify your body weight, pin down your activity level, select your goal multiplier, and run the calculation. The harder part is consistency—most shortfalls come from spreading intake unevenly across meals rather than missing the total target entirely.

Related reading: How to Cook Basmati Rice Perfectly: Stovetop & Cooker Guide

The RDA of 0.8g per kg offers a baseline, but personalized tools like this protein calculator and needs guide adjust recommendations for muscle gain or weight loss goals.

Frequently asked questions

Is 2 eggs a day enough protein?

Two large eggs deliver roughly 12 grams of protein. For a 70 kg sedentary adult needing 56 grams, two eggs cover about 21% of the daily RDA. Combined with other protein sources throughout the day, they contribute meaningfully but aren’t sufficient alone to meet most adults’ total needs.

Is 200g of protein a day too much?

For most healthy adults, 200 grams exceeds the RDA but falls within the safe range established by PubMed research. A 90 kg strength athlete targeting 2.2 g/kg for muscle gain would need 198 grams—making 200g a practical target for that individual. For a sedentary 60 kg adult, 200 grams represents over three times the RDA and may place unnecessary strain on kidney function if sustained long-term.

How much protein in 1 egg?

One large egg contains approximately 6 grams of protein, representing about 12% of the egg’s total calories. The yolk and white together deliver the full amino acid profile required for human nutrition.

How much protein do I need to lose weight?

Weight loss typically requires 1.2–1.6 g/kg to preserve lean muscle during a calorie deficit. A 75 kg person aiming to lose fat should target 90–120 grams daily. Higher protein intake supports satiety, reducing the likelihood of overeating later in the day.

How much protein should I eat a day to gain weight?

Gaining weight (muscle or combined mass) requires a calorie surplus alongside sufficient protein. For muscle-focused gains, 1.6–2.2 g/kg is the target. A 70 kg individual aiming for mass gain should consume 112–154 grams daily while maintaining a 250–500 calorie surplus above maintenance.

Protein per kg for muscle gain?

For muscle hypertrophy, the evidence-based range is 1.6–2.2 g/kg body weight daily, according to Holland & Barrett and UC Davis research. This translates to 112–154 grams for a 70 kg trainee and 120–165 grams for a 75 kg trainee engaged in regular resistance training.