Protein Intake Calculator

Protein Intake Calculator

Calculate your recommended daily protein intake based on body weight and fitness goal locally inside your web browser. This tool applies evidence-based protein ranges from sports nutrition research — not outdated RDA minimums — to give you a practical gram target tailored to whether you are maintaining, losing fat, or building muscle.

Mathematical Formula & Standards

The outdated RDA of 0.8 g/kg is the minimum to prevent deficiency in sedentary adults — not an optimal target for anyone exercising. Sports nutrition research has established higher evidence-based ranges:

1. 1General Health / Sedentary:

Range: 0.8–1.0 g/kg/day.

*Source: EFSA Dietary Reference Values; adequate for organ function and tissue repair in non-exercising adults.*

1. 2Endurance Athletes:

Range: 1.2–1.6 g/kg/day.

*Source: International Society of Sports Nutrition (ISSN) Position Stand, 2017. Endurance exercise causes significant amino acid oxidation during activity.*

1. 3Muscle Gain / Strength Training:

Range: 1.6–2.2 g/kg/day.

*Source: Morton et al. (2018), British Journal of Sports Medicine meta-analysis — 1.62 g/kg/day identified as the plateau point for muscle protein synthesis.*

1. 4Fat Loss (Muscle Preservation):

Range: 2.0–2.4 g/kg/day.

*Source: Helms et al. (2014) — higher protein intakes during caloric restriction minimise lean mass loss.*

[Body Weight (kg) + Fitness Goal Selection]
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[Goal-Specific Protein Range: g/kg × Weight]
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[Daily Protein Target (grams) + Per-Meal Distribution Guide]

Result Interpretation Guidance

• Muscle Gain (Male, 80 kg): Goal: Strength Training. Range: 1.6–2.2 g/kg. Target: 128–176 g protein/day. Distributed over 4 meals = 32–44 g per meal.
• Fat Loss (Female, 65 kg): Goal: Weight Loss / Muscle Preservation. Range: 2.0–2.4 g/kg. Target: 130–156 g protein/day. This higher target helps preserve lean mass during a caloric deficit.

• Strength Trainees and Bodybuilders: Setting protein intake to support muscle protein synthesis above maintenance levels.
• Endurance Athletes: Understanding that distance running and cycling also have elevated protein needs, often overlooked in favour of carbohydrate emphasis.
• People on Calorie-Restricted Diets: Calculating higher protein targets during fat loss to minimise lean muscle loss.
• Vegetarians and Vegans: Using the gram target to plan protein-dense plant food intake across the day.

• Starting a new diet or training program and needing a clear daily protein target.
• Evaluating whether current dietary protein intake is adequate for your training volume and goal.
• Recalculating protein targets after significant body weight changes or a shift in fitness goals.

• Do not use this tool if you have kidney disease. High protein intakes can accelerate renal function decline in people with pre-existing kidney impairment. Protein needs in renal disease must be managed by a nephrologist.
• Do not apply athletic protein ranges to sedentary elderly individuals without medical supervision. While protein needs do increase with age, the specific ranges recommended here are calibrated for active adults.
• Do not treat the output as a therapeutic prescription. For specific medical conditions — cancer cachexia, post-surgical recovery, eating disorders — consult a registered dietitian.

Regulatory & Professional Disclaimer

Evidence-Based Health Metrics & Scientific Formulas

Personal health and fitness tracking relies on clinically validated physiological formulas and standard body composition equations established by health organizations such as the World Health Organization (WHO) and the National Institutes of Health (NIH).

Our health utilities implement established mathematical models to compute body mass index, basal metabolic rates, and daily caloric requirements.

Clinical & Mathematical Reference Standards:

• Mifflin-St Jeor & Harris-Benedict BMR Equations: Computes basal metabolic rate based on age, gender, height, and weight parameters.
• Standardized Metric & Imperial Conversions: Seamlessly converts between kilograms, pounds, centimeters, and feet/inches to ensure accurate physiological inputs.
• Private Local Data Processing: Health measurements and personal metric inputs remain strictly inside your device's local browser storage.