Free 100% In-Browser Tool

Protein Calculator (Grams Per Day by Body Weight & Fitness Goal)

Calculate daily protein intake requirements in grams based on body weight, activity level, and specific fitness or body recomposition goals.

Quick Answer:Sedentary adults require 0.8g protein per kg of body weight (0.36g/lb). Active individuals and those building muscle require 1.6 to 2.2g per kg (0.7 to 1.0g per lb) of body weight daily.

Initializing tool...

Privacy First: 100% Client-Side Processing

Processed in your browser. Files are never uploaded.

How to Use the Protein Calculator (Daily Intake by Goal & Activity)

1Select your measurement system (Imperial lbs or Metric kg).
2Enter your current body weight.
3Select your primary goal: Maintenance, Fat Loss / Cutting, Muscle Hypertrophy, or Endurance Athletics.
4Choose your daily physical activity level from sedentary to highly active.
5Review your total grams per day, per-meal targets (3 to 5 meals), and percentage of daily calories.

Formula & How It Works

ISSN & ACSM Macronutrient Benchmarks

Daily Protein (g) = Weight (kg) × Goal Multiplier

Applies evidence-based intake multipliers: Sedentary (0.8 g/kg), Endurance (1.2–1.4 g/kg), Active/Hypertrophy (1.6–2.2 g/kg), and Aggressive Cutting (2.0–2.4 g/kg lean mass).

Worked Examples

180 lb Adult Building Muscle

Input: 180 lbs (81.65 kg), Goal: Hypertrophy / Strength, Active

Explanation: Based on 1.0g per lb of body weight (2.2 g/kg), optimizing muscle protein synthesis (MPS) across workouts.

Result: Target: 163g – 180g / day (3 meals @ 55g or 4 meals @ 42g)

140 lb Person in Caloric Deficit (Fat Loss)

Input: 140 lbs (63.50 kg), Goal: Fat Loss / Lean Retention

Explanation: Elevated protein during a caloric deficit preserves lean muscle mass while promoting satiety.

Result: Target: 126g – 140g / day (4 meals @ 33g)

160 lb Sedentary Adult Maintenance

Input: 160 lbs (72.57 kg), Goal: General Health / Maintenance, Sedentary

Explanation: Standard RDA baseline of 0.8 to 1.0 g/kg prevents nitrogen deficiency in non-training adults.

Result: Target: 58g – 73g / day

Frequently Asked Questions

Can eating too much protein damage healthy kidneys?▼

Extensive scientific reviews (such as the Journal of Nutrition and ISSN position stands) show that high-protein diets up to 2.8g/kg/day do not cause kidney dysfunction or impair renal filtration in healthy individuals with normal baseline kidney function.

How much protein can the body absorb in one meal?▼

The body can absorb virtually all consumed protein over time. However, to maximize Muscle Protein Synthesis (MPS), research suggests consuming approximately 25g to 40g of high-quality protein per meal (roughly 0.4 g/kg per feeding) containing at least 2.5g to 3g of leucine.

Should plant-based eaters consume more protein?▼

Yes, generally about 10% more. Because many plant proteins have slightly lower bioavailability and varying amino acid profiles compared to whey or egg, consuming 1.8 to 2.2 g/kg ensures adequate leucine and essential amino acid availability.

Does timing matter (the 'anabolic window')?▼

Total daily protein intake is far more critical than immediate post-workout timing. However, spreading protein evenly across 3 to 5 meals spaced 3 to 4 hours apart creates optimal anabolic signaling throughout the day.

How does protein help with weight loss?▼

Protein has the highest Thermic Effect of Food (TEF) of all macronutrients (20–30% of its calories are burned during digestion) and strongly stimulates satiety hormones like GLP-1, PYY, and CCK while reducing ghrelin.

Is this calculator private?▼

Yes. All weight and fitness parameters remain strictly inside your browser session.

Quick Reference & Conversion Table

Body Weight	Sedentary RDA	Endurance Runner	Hypertrophy / Lifting	Aggressive Cut
120 lbs (54 kg)	43 g/day	65–76 g/day	86–119 g/day	108–130 g/day
150 lbs (68 kg)	54 g/day	82–95 g/day	109–150 g/day	136–163 g/day
180 lbs (82 kg)	66 g/day	98–115 g/day	131–180 g/day	164–197 g/day
200 lbs (91 kg)	73 g/day	109–127 g/day	146–200 g/day	182–218 g/day
220 lbs (100 kg)	80 g/day	120–140 g/day	160–220 g/day	200–240 g/day

⚠️ Common Pitfalls to Avoid

•Relying solely on the baseline RDA (0.8 g/kg), which is the minimum threshold to prevent clinical deficiency, not an optimal target for active individuals.
•Consuming all daily protein in a single meal rather than distributing intake across 3 to 5 feedings to repeatedly trigger muscle protein synthesis (MPS).
•Counting incomplete protein sources without ensuring diverse essential amino acid (EAA) profiles.

💡 Practical Real-World Uses

•Meal prep planning for body recomposition, powerlifting, and bodybuilding athletes.
•Combating age-related sarcopenia in older adults by meeting the 1.2–1.5 g/kg clinical senior target.
•Structuring high-satiety nutritional protocols for sustainable weight management.

Protein Needs by Training Style

Training Focus	Recommended Range (g/kg)	Recommended Range (g/lb)	Primary Physiological Objective
Sedentary / Baseline	0.8 g/kg	0.36 g/lb	Prevent nitrogen deficiency and tissue wasting
Endurance / Marathon	1.2–1.4 g/kg	0.55–0.65 g/lb	Repair mitochondrial and muscle breakdown
Strength / Hypertrophy	1.6–2.2 g/kg	0.73–1.00 g/lb	Maximize myofibrillar protein synthesis
Cutting / Fat Loss	2.0–2.4 g/kg	0.90–1.10 g/lb	Spare muscle tissue in sustained caloric deficit