How Much Protein Should I Have a Day? A Complete Guide

Ask five people how much protein they need and you’ll get five different answers — some confidence, some guesswork, because the right number shifts depending on how much you move, how old you are, and what you’re actually trying to achieve. This guide cuts through the confusion by grounding every recommendation in your own body weight and activity level, so you can settle on a range that fits.

RDA for sedentary adults: 0.8 g per kg of body weight ·
Sample 70 kg person RDA: 56 g/day ·
Active individual range: 1.2–1.7 g/kg ·
Upper limit (general guidance): 2.0 g/kg

The table below shows the key benchmarks: your ideal protein number lives in a range, not a fixed rule.

How much protein should I have a day?

RDA for sedentary adults

• The official Recommended Dietary Allowance (RDA) for a sedentary adult is 0.8 grams of protein per kilogram of body weight per day, according to the Hims medical weight-loss platform.
• For a 70 kg (154 lb) person, that works out to about 56 grams daily — roughly the amount in a chicken breast plus two eggs.
• This baseline is designed to prevent deficiency, not to optimize performance or body composition. The Hims calculator notes that men should get at least 56 g/day to avoid losing muscle.

The implication: meeting RDA keeps you out of trouble, but it won’t build noticeable muscle or support high levels of activity. It’s a floor, not a target for anyone who exercises.

Active and athletic protein needs

• For people training 3–5 days per week, the gold standard is 1.0 gram per pound of body weight (≈2.2 g/kg), per ATHLEAN-X fitness guidance.
• Most research settles on a range of 1.2–1.7 g/kg for moderately active individuals, according to Ro weight-loss clinical guidance.
• A 2022 systematic review and meta-analysis of 49 studies with 1,863 participants found that muscle mass increased up to 1.6 g/kg, after which additional protein provided no further benefit, as reported by StrengthLog fitness research.
• Participants who reached 1.6+ g/kg gained 300 grams more fat-free mass and lost 400 grams of fat over three months compared with those maintaining 1.4 g/kg, per the same StrengthLog meta-analysis.

The catch: the gap between 1.4 and 1.6 g/kg looks small on paper, but the data says that 0.2 g/kg made a measurable difference in body composition over 90 days.

Protein for older adults

• Older adults (65+) may benefit from 1.2–1.5 g/kg to counteract sarcopenia — age-related muscle loss — according to clinical guidelines cited by Hims.
• The 2022 systematic review found that the 1.6 g/kg muscle-gain threshold applied to people under 65; for older populations, optimal intakes remain less precisely defined, per StrengthLog.

How does body weight affect protein needs for a 70 kg person?

Protein calculation formula

• Use this simple formula: weight (kg) × g/kg factor = daily protein (g). Factors range from 0.8 (sedentary) up to 2.2 (intense training).
• For pounds, divide weight in pounds by 2.2 to get kilograms, then multiply by your chosen factor.
• ATHLEAN-X recommends 1.0 g per pound for those training 3–5 days/week — effectively skipping the kg conversion and using a 2.2 g/kg factor.

Example: 70 kg person

• Sedentary: 70 × 0.8 = 56 g/day (the RDA minimum).
• Active (moderate exercise): 70 × 1.2–1.7 = 84–119 g/day.
• Muscle building (strength training): 70 × 1.6–2.2 = 112–154 g/day.
• Weight loss (with exercise): 70 × 1.2–1.6 = 84–112 g/day, as recommended by Ro weight-loss clinical guidance.

Is 100g or 200g of protein a day too much?

Evaluating 100g of protein

• For most active adults, 100 g falls within the moderate-to-optimal range. A 70 kg active person at 1.4 g/kg would get 98 g — right on target.
• Dr. Craig Primack, SVP of Weight Loss at Hims, recommends aiming for 100 g daily as essential for preserving muscle mass and feeling full during weight loss.

For a 60 kg person, 100 g is 1.67 g/kg — already at the muscle-building upper range. It’s not excessive, but it’s purposeful eating, not casual.

Evaluating 200g of protein

• 200 g corresponds to about 2.9 g/kg for a 70 kg person — well above the 2.0 g/kg upper limit cited by most guidelines.
• Only elite athletes or very large individuals (100+ kg) would logically approach 200 g. For a 70 kg recreational lifter, it likely exceeds metabolic need.
• The Ro guidance notes that up to 2.0 g/kg may benefit recovery during intense training, but 200 g on a 70 kg frame is 2.86 g/kg — beyond that ceiling.

Upper limits and safety

• General guidance pegs a practical upper limit at 2.0 g/kg, or about 140 g/day for a 70 kg person.
• Excessive intake may stress kidneys in people with pre-existing kidney conditions, according to general medical consensus.
• A high-protein diet is typically defined as 1–1.2 g/kg or 30% of daily calories from protein, per Hims.

The trade-off: for a healthy person, 200 g is not toxic — but it’s also not useful. The body has no storage for excess amino acids; what it doesn’t use, it converts to urea and excretes.

How can I calculate my personal protein intake?

Step-by-step calculation method

1. Weigh yourself in kilograms (divide pounds by 2.2 if needed).
2. Choose your activity factor: 0.8 (sedentary), 1.2–1.7 (active), 1.6–2.2 (muscle gain), or 1.2–1.6 (weight loss).
3. Multiply: weight × factor = grams per day.
4. Spread intake across 3–4 meals for consistent muscle protein synthesis.

Using a protein calculator

• Online calculators like ATHLEAN-X, StrengthLog, and Ro automate the math and adjust for activity level and goal.
• Most calculators also estimate associated calorie intake from protein (4 calories per gram).

Common mistakes

• Using body weight in pounds but applying a g/kg factor — results in double the intended intake.
• Setting intake based on someone else’s plan rather than your own weight and activity.
• Assuming more is always better. The StrengthLog meta-analysis shows diminishing returns after 1.6 g/kg for muscle gain.

What this means: a 5-minute calculation beats months of guesswork. The error most people make is skipping the math entirely.

How much protein do I need for muscle gain and weight loss?

Protein for muscle building

• Consensus from Ro and StrengthLog: 1.6–2.2 g/kg paired with progressive strength training.
• That’s about 15%–25% of daily calories from protein for most people, per Ro clinical guidance.
• ATHLEAN-X recommends the simpler 1.0 g per pound for those in serious training.

Protein for weight loss

• 1.2–1.6 g/kg is the standard range for losing weight while preserving lean mass, per Ro.
• For a 150-pound (68 kg) person, that’s about 80–110 g/day.
• Dr. Craig Primack of Hims specifically recommends 100 g/day for weight-loss patients to maintain muscle and satiety.

Differences for men and women

• Per Hims, men should get a minimum of 56 g/day; women’s baseline RDA is 46 g/day.
• When adjusted per kilogram, women typically need slightly less absolute protein due to lower average body weight, but the g/kg ranges remain the same — 1.2–1.6 g/kg for weight loss applies equally.
• Hormonal differences mean women may not benefit from the extreme upper end (2.2 g/kg) as much as men, though research is still emerging.

The implication: for women, hitting 80–100 g/day during weight loss is practical and effective; for men, 100–140 g/day is a reasonable target depending on body size.

Upsides & Downsides of adjusting protein intake

Understanding these trade-offs helps you make an informed decision about your protein intake.

What experts say about daily protein

“The recommended dietary allowance (RDA) for protein is 0.8 grams per kilogram of body weight — that’s the minimum to prevent deficiency, not the optimal amount for health or performance.”

— Hims Medical Weight-Loss Platform

“A systematic review of 49 studies found that muscle mass increased with protein intake up to 1.6 grams per kilogram per day — beyond that, additional protein provided no further gains.”

— StrengthLog Fitness Research

“For weight loss, I recommend aiming for 100 grams of protein per day. It’s essential for preserving muscle mass and keeping full during calorie restriction.”

— Dr. Craig Primack, SVP of Weight Loss at Hims

For a more personalized breakdown, you can use a calculator that estimates your daily protein needs by weight and goals based on your specific activity level and body composition.

Frequently asked questions

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For a 70 kg adult with a moderate exercise routine, the difference between eating 56 g/day and 100 g/day is not just a number — it’s roughly 44 grams of protein that separate maintenance from meaningful body-composition change. For a woman targeting weight loss, the same gap determines whether muscle is preserved or sacrificed. The choice is straightforward: calculate your weight in kilograms, pick the factor that matches your goal, and hit that range consistently. Ignore the fads, ignore the bro-science, and trust the per-kilo math that adjusts with you.