Protein Intake Calculator
Calculate your optimal daily protein intake based on weight, activity level, and fitness goals.
How Much Protein Do You Need?
Contents
Daily Protein Intake Chart by Body Weight and Goal
| Body Weight | General Health | Fat Loss | Muscle Building | Athlete |
|---|---|---|---|---|
| 120 lbs (54 kg) | 44–54 g | 65–87 g | 87–108 g | 97–119 g |
| 140 lbs (64 kg) | 51–64 g | 77–102 g | 102–128 g | 115–141 g |
| 160 lbs (73 kg) | 58–73 g | 88–117 g | 117–146 g | 131–160 g |
| 180 lbs (82 kg) | 66–82 g | 98–131 g | 131–164 g | 148–180 g |
| 200 lbs (91 kg) | 73–91 g | 109–146 g | 146–182 g | 164–200 g |
| 220 lbs (100 kg) | 80–100 g | 120–160 g | 160–200 g | 180–220 g |
| 250 lbs (113 kg) | 91–113 g | 136–181 g | 181–226 g | 204–249 g |
Ranges: General health 0.8–1.0 g/kg | Fat loss 1.2–1.6 g/kg | Muscle building 1.6–2.0 g/kg | Athlete 1.8–2.2 g/kg. For obese individuals, calculate based on lean body mass or ideal body weight.
Protein Requirements by Activity Level
| Activity Level | Protein (g/kg/day) | Example |
|---|---|---|
| Sedentary | 0.8 – 1.0 | Desk job, no planned exercise |
| Lightly Active | 1.0 – 1.2 | Casual exercise 1-3 days/week |
| Moderately Active | 1.2 – 1.4 | Structured training 3-5 days/week |
| Very Active | 1.4 – 1.7 | Intense training 6-7 days/week |
| Extremely Active | 1.7 – 2.2 | Athletes, 2x daily training, physical labor |
These ranges are supported by position statements from the International Society of Sports Nutrition (ISSN) and the American College of Sports Medicine (ACSM).
Protein for Muscle Building vs Weight Loss
Muscle Building
A 2018 meta-analysis by Morton et al. in the British Journal of Sports Medicine found that protein intakes of 1.6 g/kg/day maximized resistance training–induced gains in fat-free mass. Intakes above 2.2 g/kg/day showed no additional benefit for muscle growth in most individuals.
Fat Loss
During energy restriction, a 2016 study by Longland et al. showed that consuming 2.4 g/kg/day combined with high-intensity training allowed participants to gain lean body mass while losing fat — even in a 40% caloric deficit. More conservative targets of 1.2–1.6 g/kg/day are sufficient for most dieters to preserve muscle.
Key takeaway: Whether bulking or cutting, aim for at least 1.6 g/kg/day if you do resistance training. Distribute protein evenly across 3-4 meals with 0.4–0.55 g/kg per meal for optimal muscle protein synthesis.
Best Protein Sources
| Food | Serving | Protein (g) | Calories |
|---|---|---|---|
| Chicken breast (cooked) | 100 g | 31 g | 165 |
| Greek yogurt (nonfat) | 170 g | 17 g | 100 |
| Eggs (whole) | 2 large | 12 g | 140 |
| Salmon (cooked) | 100 g | 25 g | 208 |
| Lean ground beef (95%) | 100 g | 26 g | 150 |
| Tofu (firm) | 100 g | 17 g | 144 |
| Lentils (cooked) | 1 cup | 18 g | 230 |
| Whey protein powder | 1 scoop (30 g) | 24 g | 120 |
| Cottage cheese (low-fat) | 1 cup | 28 g | 163 |
| Chickpeas (cooked) | 1 cup | 15 g | 269 |
Signs of Protein Deficiency
- Muscle loss and weakness — The body breaks down muscle tissue to meet amino acid needs when dietary protein is insufficient.
- Frequent illness — Antibodies and immune cells require protein for synthesis. Low intake weakens immune defense.
- Slow wound healing — Collagen and tissue repair depend on adequate amino acid supply.
- Hair thinning and brittle nails — Hair and nails are made of keratin, a structural protein. Deficiency shows here early.
- Persistent hunger and cravings — Protein is the most satiating macronutrient. Low intake often leads to overeating carbohydrates and fats.
- Edema (swelling) — Severe deficiency reduces blood albumin, causing fluid to accumulate in tissues.
- Fatigue and brain fog — Amino acids are precursors to neurotransmitters like serotonin and dopamine.
Frequently Asked Questions
How much protein do I need per day?
The WHO/RDA minimum is 0.8 g/kg of body weight per day for sedentary adults. However, the International Society of Sports Nutrition recommends 1.4–2.0 g/kg/day for active individuals. Those building muscle or losing fat benefit from the higher end of this range (1.6–2.2 g/kg/day).
Can you eat too much protein?
For healthy individuals with normal kidney function, protein intakes up to 2.2 g/kg/day are well-supported by evidence and considered safe. A 2016 review in the Journal of the International Society of Sports Nutrition found no adverse effects at intakes up to 3.3 g/kg/day over a year in trained individuals. However, those with pre-existing kidney disease should consult their physician.
Does protein timing matter?
Total daily protein intake matters more than timing. That said, distributing protein evenly across 3-4 meals (0.4–0.55 g/kg per meal) maximizes muscle protein synthesis throughout the day. The "anabolic window" post-workout is less critical than once thought — consuming protein within a few hours of training is sufficient.
Is plant protein as effective as animal protein?
Plant proteins can support muscle growth and health when consumed in sufficient variety and quantity. Most plant sources have lower leucine content and digestibility (measured by PDCAAS/DIAAS scores) compared to animal sources. The recommendation is to consume approximately 10-20% more total protein on a fully plant-based diet to compensate for lower bioavailability.
Do older adults need more protein?
Yes. The PROT-AGE study group recommends 1.0–1.2 g/kg/day for healthy adults over 65, and up to 1.5 g/kg/day for those with acute or chronic illness. Age-related anabolic resistance means older muscles require a higher amino acid stimulus to trigger the same protein synthesis response as younger muscles.
Should I use protein supplements?
Whole food sources are generally preferred because they provide additional nutrients (vitamins, minerals, fiber). However, protein supplements like whey, casein, or plant-based powders are a convenient and effective way to meet daily targets — especially post-workout or when whole food meals are impractical. They are not inherently superior to food protein.
Sources & Methodology
- Morton RW, Murphy KT, McKellar SR, et al. A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults. Br J Sports Med. 2018;52(6):376-384.
- Jäger R, Kerksick CM, Campbell BI, et al. International Society of Sports Nutrition Position Stand: protein and exercise. J Int Soc Sports Nutr. 2017;14:20.
- Bauer J, Biolo G, Cederholm T, et al. Evidence-based recommendations for optimal dietary protein intake in older people: a position paper from the PROT-AGE Study Group. J Am Med Dir Assoc. 2013;14(8):542-559.
- World Health Organization. Protein and amino acid requirements in human nutrition: report of a joint FAO/WHO/UNU expert consultation. WHO Technical Report Series 935. 2007.
- Longland TM, Oikawa SY, Mitchell CJ, Devries MC, Phillips SM. Higher compared with lower dietary protein during an energy deficit combined with intense exercise promotes greater lean mass gain and fat mass loss. Am J Clin Nutr. 2016;103(3):738-746.
This calculator uses peer-reviewed formulas and clinical guidelines. Results are estimates and should not replace professional medical advice.
Medical Disclaimer: This tool provides general educational estimates. Always consult your prescribing physician or healthcare provider before making medication changes or interpreting results from population-based models.