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PROTEIN REFERENCE • ADULTS 19+

Protein Intake Calculator

Estimate weight-based daily protein reference amounts. Because current recommendations differ by source and context, this tool labels each range instead of presenting one number as a universal requirement.

Sources explainedRuns in your browserNo sign-upUpdated September 2026
YOUR DETAILS

Your protein reference

Choose the reference context you want to view. The calculation uses body weight only; it does not diagnose a deficiency or create a personal diet plan.

Protein intake calculator inputs
Units
Enter 30–300 kg.

Choose the context you want highlighted. Both the current U.S. guidance and the National Academies RDA are shown in the result.

Privacy: the calculation runs in your browser. This tool does not store or send your entries.

YOUR RESULT STARTS HERE

Put protein amounts in context

Choose a reference context to see a daily protein range and an example of equal portions.

  • Daily range
  • Portion illustration
Chicken, eggs, yogurt, chickpeas and nuts arranged on a table
EXPLORE ANOTHER RESULT

Adjust your inputs and calculate again to compare.

Edit your details

For general education in adults 19+. This page is not intended for pregnancy, breastfeeding, children, kidney disease, clinical nutrition therapy, or other situations that require individualized protein advice.

What your protein result means

The result is a body-weight conversion of published protein reference values. It is not a test of your current intake and it does not tell you whether you are deficient.

Different authorities use different reference concepts. The current U.S. Dietary Guidelines for Americans 2025–2030 give a protein serving goal of 1.2–1.6 g/kg/day, while the National Academies protein RDA remains 0.8 g/kg/day for healthy adults. Sports-nutrition guidance commonly uses 1.2–2.0 g/kg/day for athletes.

How to use this protein calculator

  1. Choose metric or US/Imperial units.
  2. Enter your current body weight.
  3. Select whether you want general adult guidance or the athlete/training range highlighted.
  4. Select Calculate Protein and compare the source-labeled values.

Do not automatically choose the highest number. Your energy intake, training, health status, age and medical care can affect what is appropriate for you.

How this calculator works

The calculator converts pounds to kilograms when needed, then multiplies body weight by the published grams-per-kilogram reference.

Weight-based formula

Protein (g/day) = body weight (kg) × reference value (g/kg/day)

Current U.S. Dietary Guidelines: weight × 1.2 to 1.6.

National Academies RDA: weight × 0.8.

Athlete reference: weight × 1.2 to 2.0.

Example at 70 kg

A 70 kg adult converts to 84–112 g/day using the 2025–2030 U.S. Dietary Guidelines range, 56 g/day using the National Academies RDA, and 84–140 g/day using the athlete range.

Why do protein recommendations differ?

The numbers answer different questions. The RDA is a nutrient-adequacy reference intended to meet the needs of nearly all healthy people in a life-stage group. The 2025–2030 U.S. Dietary Guidelines introduced a higher 1.2–1.6 g/kg/day protein serving goal within an overall dietary pattern and calorie context. Athlete guidance is designed for training, recovery and performance.

Because these concepts are not interchangeable, this calculator keeps the source labels visible rather than calling one number your exact “need.”

Important limitations

  • This calculator uses body weight only. It does not account for total calorie intake, body composition, training volume, diet quality, illness or medical treatment.
  • It is not intended for children, pregnancy or breastfeeding.
  • People with chronic kidney disease or other conditions that affect protein handling may need a different target. Follow individualized advice from your clinician or registered dietitian.
  • More protein is not automatically better. Food quality, total energy intake and the rest of the diet still matter.
  • The athlete range is broad because sport type, training load and energy availability differ.

Common questions

Why does the page show both 0.8 g/kg and 1.2–1.6 g/kg?

They come from different reference systems. The National Academies RDA remains 0.8 g/kg/day for healthy adults, while the U.S. Dietary Guidelines for Americans 2025–2030 introduced a 1.2–1.6 g/kg/day protein serving goal within dietary-pattern guidance.

Do athletes always need 2.0 g/kg/day?

No. The athlete reference is a range, not a requirement to reach the upper end. Individual training and nutrition needs vary.

Are my entries saved?

No. The calculation runs locally in your browser and this tool does not use browser storage for the weight you enter.

References & sources

  1. U.S. Department of Agriculture and U.S. Department of Health and Human Services. Dietary Guidelines for Americans, 2025–2030. Current U.S. dietary guidance, including a protein serving goal of 1.2–1.6 g/kg/day adjusted as needed for individual caloric requirements.
  2. Institute of Medicine, Food and Nutrition Board. Dietary Reference Intakes for Macronutrients (2005). Adult protein RDA of 0.8 g/kg/day.
  3. NIH Office of Dietary Supplements. Dietary Supplements for Exercise and Athletic Performance. Describes protein intakes of 1.2–2.0 g/kg/day for athletes.
  4. Thomas DT, Erdman KA, Burke LM. Nutrition and Athletic Performance. J Acad Nutr Diet. 2016;116(3):501–528. Joint Academy of Nutrition and Dietetics, Dietitians of Canada and ACSM position statement.

Sources checked and page updated on . For educational use; not a diagnosis, prescription or substitute for individualized nutrition or medical advice.