Reviewed by Sarah Mitchell, RD, MS Nutrition
Last updated May 2025
Protein Calculator — Daily Protein Intake Goal
The CalcNest Protein Calculator determines your ideal daily protein intake using recommendations from the International Society of Sports Nutrition and the World Health Organization. Protein is the most important macronutrient for muscle repair, immune function, and satiety during weight loss. Enter your body weight, activity level, and goal to receive a personalized protein target in grams per day. This calculator adjusts recommendations for sedentary individuals, recreational exercisers, and competitive athletes alike.
You might also need: Macro Calculator · Calorie Calculator
How the Protein Calculator Works
This calculator uses evidence-based protein recommendations from the World Health Organization and International Society of Sports Nutrition to determine your ideal daily protein intake. The recommendation varies based on your body weight and specific fitness goal.
For weight loss, protein needs increase to 1.8–2.2g per kg of body weight to preserve lean muscle mass during caloric restriction. For maintenance, the recommended range is 1.2–1.6g/kg. For muscle gain and athletes, the range is 1.6–2.0g/kg to support muscle protein synthesis and recovery.
The calculator provides a minimum, maximum, and optimal value. The optimal target is the midpoint of your recommended range — the sweet spot supported by research for most individuals with your goal.
The Formula
Daily Protein = Body Weight (kg) × Multiplier (g/kg)
| Goal | Min (g/kg) | Max (g/kg) |
|---|---|---|
| Weight Loss | 1.8 | 2.2 |
| Maintenance | 1.2 | 1.6 |
| Muscle Gain | 1.6 | 2.0 |
These ranges are based on the WHO Technical Report Series 935 and the ISSN position stand on protein and exercise. The higher end of each range is recommended for individuals with higher training volumes or during aggressive caloric deficits.
Frequently Asked Questions
Can you eat too much protein?
For healthy individuals with normal kidney function, protein intakes up to 2.2 g/kg body weight per day are safe according to research published in the Journal of the International Society of Sports Nutrition. Extremely high intakes above 3.0 g/kg are not harmful but offer diminishing returns for muscle building. People with existing kidney disease should consult their doctor before increasing protein intake.
What are the best sources of protein?
Complete protein sources that contain all essential amino acids include chicken breast, eggs, fish, Greek yogurt, whey protein, and tofu. A mix of animal and plant proteins throughout the day ensures you get all amino acids. Leucine-rich sources like whey, eggs, and chicken are particularly effective at stimulating muscle protein synthesis.
Does protein timing matter?
While total daily protein intake is more important than timing, distributing protein evenly across 3-5 meals of 20-40 grams each can optimize muscle protein synthesis. Consuming protein within 2 hours after resistance training is beneficial but not as critical as once believed. The anabolic window is wider than the old 30-minute myth suggested.
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Sources & References
Disclaimer: Protein recommendations are general guidelines. Individual needs may vary based on kidney function, medical conditions, age, and training specifics. People with kidney disease should consult a healthcare provider before increasing protein intake. This calculator is not a substitute for professional dietary advice.