Daily Protein Intake Calculator — How Much Protein Do You Need? (2026)

Q: How much protein do I need per day?

It depends on body weight and goal. General population guidelines start around 0.8g per kg of body weight (the RDA minimum), while people who are active, building muscle, or in a calorie deficit commonly aim for 1.2-2.2g per kg — a 70kg person's range would be roughly 56g to 154g per day.

Q: Do I need more protein when losing weight?

Many people aim higher during a calorie deficit — often cited in the 1.8-2.4g per kg range — since adequate protein helps preserve lean muscle mass while losing fat. This calculator uses 2.2g/kg as a common cutting target.

Q: How much protein do I need to build muscle?

Sports nutrition research commonly cites a range of about 1.6-2.2g per kg of body weight for muscle building, with diminishing returns above that range for most people. This calculator uses 1.8g/kg as a middle-of-range muscle building target.

Q: Is it bad to eat too much protein?

For most healthy adults, higher protein intakes within commonly studied ranges (up to roughly 2.2-2.5g/kg) are not associated with harm. People with existing kidney conditions should follow their doctor's specific guidance rather than general calculators.

Q: Should I spread protein across meals or eat it all at once?

Spreading protein across 3-4 meals (roughly 20-40g per meal) is commonly recommended over consuming it all in one sitting, since the body can only use a limited amount for muscle protein synthesis at a time.

Q: Does this calculator account for body fat percentage?

No — it uses total body weight, which is the simpler and more commonly used approach in general guidelines. Lean body mass-based calculations exist and can be more precise for people with higher body fat percentages, but require a body fat measurement this tool doesn't ask for.

Protein Intake Guidelines by Goal — Reference Table

Ranges below combine the NIH/NCBI Recommended Dietary Allowance with the International Society of Sports Nutrition (ISSN) Position Stand on Protein and Exercise (see full Sources below). Individual needs vary — these are general starting points, not personalized medical advice.

Goal	g per kg body weight	g per lb body weight	Example (70kg / 154lb)
Sedentary / general health	0.8g/kg	0.36g/lb	56g/day
Active / general fitness	1.2g/kg	0.55g/lb	84g/day
Muscle building	1.8g/kg	0.82g/lb	126g/day
Cutting / fat loss	2.2g/kg	1.0g/lb	154g/day
Endurance training	1.4g/kg	0.64g/lb	98g/day

Why Body Weight Alone Doesn't Tell the Whole Story

Two people at the same body weight can have very different protein needs depending on activity level, muscle mass, and whether they're trying to gain, maintain, or lose weight. That's why this calculator asks for a goal, not just a weight — a sedentary person and a person lifting weights four times a week at the same bodyweight can have gram targets more than double apart.

Cutting/fat loss targets skew higher than muscle-building targets, which can seem counterintuitive — the reasoning documented in the research is that adequate protein helps preserve lean muscle mass while eating in a calorie deficit, so the body pulls less from muscle tissue for energy.

Spreading Protein Across the Day

3-4 meals is a commonly cited sweet spot rather than one or two large protein hits
20-40g per meal is often enough to support muscle protein synthesis per sitting
Post-workout window is commonly prioritized, though total daily intake matters more than exact timing

Method: NIH RDA + ISSN Position Stand on Protein and Exercise (see Sources below) · Deterministic calculation — no AI, no arbitrary estimate

Constants Used in This Calculator

Goal	Factor (g/kg)	Basis
Sedentary	0.8	NIH/NCBI RDA minimum, unchanged since 1943
Active / fitness	1.2	Between the RDA floor and the ISSN exercising-adult range (1.4-2.0)
Muscle building	1.8	Within ISSN Position Stand's 1.4-2.0g/kg range for muscle mass maintenance/gain
Cutting / fat loss	2.2	Between the PMC deficit review's 1.2-1.7g/kg (recreational) and ISSN's 2.3-3.1g/kg (resistance-trained, max retention)
Endurance	1.4	Floor of the ISSN Position Stand's 1.4-2.0g/kg exercising-adult range
Calories per gram protein	4 kcal	Standard Atwater factor

Calculation Formula

— Unit conversion —
weight_kg = unit === 'lb' ? weight / 2.2046 : weight

— Daily protein target —
daily_grams = weight_kg × goal_factor
daily_calories = daily_grams × 4

— Per-meal split (3 meals) —
grams_per_meal = daily_grams / 3

General guideline only — not personalized medical or nutrition advice. Consult a registered dietitian for guidance specific to a medical condition.

From a Gram Target to an Actual Plate

This calculator gives a number. It doesn't tell you what to actually cook to hit it — and hitting 126-154g of protein a day from whole food takes more planning than most people expect, especially without leaning on protein powder for half the total.

RealProteinKitchen.com is built around exactly that gap — whole-food, high-protein recipes (cottage cheese, eggs, Greek yogurt, chicken) with the protein grams per serving listed on every page, no powder required. A few ways it lines up with the numbers above:

Hitting a sedentary/active target (56-84g/day): a cottage cheese pancakes breakfast (24g) plus a protein smoothie bowl (26g) already covers most of a lower-range day
Hitting a muscle-building target (~126g/day): the site's Bulking Meal Prep Bowl alone is 45g per serving — three balanced meals gets there without needing a shake
Hitting a cutting target (~154g/day): the Air Fryer Chicken and Vegetables (38g) and Sheet Pan Salmon (36g) recipes are both high-protein, comparatively lower-calorie mains suited to a deficit
Post-workout meals: a dedicated Post Workout Protein Shake and Recovery Smoothie recipe, both built from real food instead of a scoop of powder
Meal prepping toward a weekly total: several recipes are designed as 5-container meal preps, making a weekly gram target easier to plan than assembling it meal-by-meal each day

Every recipe lists total protein per serving up front, so it's straightforward to combine a few and land close to whatever target this calculator gives you.

Browse High-Protein Recipes →

Frequently Asked Questions

How much protein do I need per day? ▼

The U.S. RDA, set by the Food and Nutrition Board, is 0.8g per kg of body weight — a figure that has stayed unchanged for more than 70 years and represents the minimum to avoid nitrogen loss, not an optimal target. The International Society of Sports Nutrition (ISSN) Position Stand recommends 1.4-2.0g/kg for people who exercise regularly.

Do I need more protein when losing weight? ▼

A peer-reviewed review on very low-calorie diets found 1.2-1.7g/kg effectively maintains fat-free mass and strength during energy restriction for recreational exercisers. The ISSN Position Stand goes further for resistance-trained individuals, citing 2.3-3.1g/kg to maximize lean mass retention during a calorie deficit — this calculator uses 2.2g/kg as a middle-ground target for general (non-elite) cutting.

How much protein do I need to build muscle? ▼

The ISSN Position Stand on Protein and Exercise states 1.4-2.0g per kg of body weight per day is sufficient for building and maintaining muscle mass in most exercising individuals, distributed in doses of roughly 20-40g every 3-4 hours.

Is it bad to eat too much protein? ▼

The ISSN Position Stand notes evidence that even intakes above 3.0g/kg/day have shown positive body-composition effects in resistance-trained individuals without reported harm in healthy adults. People with existing kidney conditions should follow their doctor's guidance rather than a general calculator.

Should I spread protein across meals or eat it all at once? ▼

The ISSN Position Stand specifically recommends doses of roughly 20-40g of high-quality protein spread every 3-4 hours across the day, rather than concentrating intake into one or two meals.

Does this calculator account for body fat percentage? ▼

No — it uses total body weight, the simpler approach used in the RDA and most general guidelines. Lean-mass-based calculations exist and can be more precise for people with higher body fat percentages, but require a body fat measurement this tool doesn't ask for.

What foods have the most protein per calorie? ▼

Whole foods like cottage cheese, Greek yogurt, chicken breast, egg whites, and white fish tend to offer the most protein per calorie compared to fattier meats or processed protein snacks.

🥩 How Much Protein Do You Need?