Protein Intake Calculator
Estimate a general daily protein range from your body weight and activity or training context. See grams per day, grams per kilogram, grams per pound and a simple meal-split calculation.
Calculate Your Protein Range
For adults. Enter body weight and choose the reference context that best matches what you want to calculate. The result is a general planning estimate, not an individualized nutrition prescription.
How the Protein Calculator Works
The calculator converts your body weight to kilograms when necessary and multiplies that weight by the selected protein reference expressed as grams of protein per kilogram of body weight per day.
For example, an exercising adult weighing 70 kg using a range of 1.4–2.0 g/kg/day would calculate:
70 × 2.0 = 140 g/day
The resulting planning range is therefore approximately 98–140 grams of protein per day. It is a mathematical application of the selected reference range, not a statement that every 70 kg person personally requires that amount.
Protein Reference Ranges Used
Different protein numbers answer different questions. A population reference intake for generally healthy adults is not the same thing as a sports-nutrition range intended for people who exercise.
EFSA’s population reference intake for adults, including older adults.
A sports-nutrition range described by the International Society of Sports Nutrition as sufficient for most exercising individuals.
The calculator intentionally keeps these contexts separate. Choosing the exercise option does not mean the upper end is automatically better or necessary for a particular person.
These calculator options are intended for general adult educational use. Children and adolescents, pregnancy, breastfeeding, clinical conditions and therapeutic diets can involve different requirements and should not be estimated by simply applying these adult options.
What Does g/kg/day Mean?
The abbreviation g/kg/day means grams of protein per kilogram of body weight per day.
Using a weight-relative reference allows the calculation to scale with body size. A 60 kg adult and a 90 kg adult therefore produce different gram-per-day values when the same g/kg reference is applied.
| Body Weight | 0.83 g/kg | 1.4 g/kg | 2.0 g/kg |
|---|---|---|---|
| 50 kg | 41.5 g/day | 70 g/day | 100 g/day |
| 60 kg | 49.8 g/day | 84 g/day | 120 g/day |
| 70 kg | 58.1 g/day | 98 g/day | 140 g/day |
| 80 kg | 66.4 g/day | 112 g/day | 160 g/day |
| 90 kg | 74.7 g/day | 126 g/day | 180 g/day |
| 100 kg | 83 g/day | 140 g/day | 200 g/day |
Why Does Exercise Change the Reference Range?
Protein provides amino acids used throughout the body, including in the maintenance and remodeling of body proteins. Exercise—particularly repeated training—changes the context in which protein intake is considered.
The International Society of Sports Nutrition position stand reports that an overall daily intake of approximately 1.4–2.0 g/kg/day is sufficient for most exercising individuals for building and maintaining muscle mass in conjunction with exercise.
That does not mean everyone who exercises should automatically consume 2.0 g/kg/day. Training type, training volume, total energy intake, goals, body composition and individual circumstances can all affect how sports-nutrition guidance is applied.
Understanding the Meal Split
The meal-split feature simply divides the calculated daily range by the number of meals selected.
For example, dividing a 100–140 g daily range evenly across four meals produces 25–35 g per meal.
This is included as a convenient arithmetic planning tool. It is not a recommendation that protein must be eaten in equal portions, that a specific number of meals is optimal, or that meal timing should follow a particular schedule.
Getting Protein From Food
Protein is available from both animal and plant foods. A balanced diet can use different sources according to dietary preferences, culture, allergies, availability and nutritional needs.
The calculator does not maintain a food-composition database, so it deliberately does not assign fixed protein grams to these foods. Product formulation, cooking, serving size and food type can change the amount. Check reliable food-composition data or the product’s nutrition label when tracking actual intake.
How to Interpret Your Result
A calculator can multiply weight by a reference value accurately, but the difficult part of nutrition is deciding which reference is appropriate for a particular person.
Your result should therefore be read as:
- A general educational estimate based on the selected reference.
- A convenient way to convert g/kg guidance into grams per day.
- A starting point for understanding protein recommendations.
- Not a diagnosis of protein deficiency.
- Not a personalized diet plan.
- Not a substitute for medical nutrition advice.
Body weight alone also does not describe body composition. The National Academies has noted that protein requirements relate more strongly to lean body mass than adipose tissue, which is one reason simple body-weight calculations have limitations for individuals with substantially different body compositions.
When Professional Guidance Matters
Seek guidance from an appropriately qualified healthcare professional or dietitian when protein intake needs to be considered in connection with kidney disease or impaired kidney function, liver disease, pregnancy, breastfeeding, childhood or adolescence, an eating disorder, significant illness, recovery from surgery or injury, medically prescribed diets, or another condition that changes nutritional requirements.
A clinician may consider medical history, laboratory results, medications, energy intake, body composition, disease status and other factors that this calculator does not know.
Do not use the calculator to start, stop or modify treatment, medication or a medically prescribed nutrition plan.
How to Use the Calculator
- Enter your current body weight.
- Select kilograms or pounds.
- Choose the general adult reference or exercise/training context.
- Select Calculate Protein.
- Review the estimated grams per day and the g/kg and g/lb values used.
- Optionally change the meal count to see a simple mathematical split of the daily range.
The arithmetic is designed to run with JavaScript in your browser and does not need to send your weight to a separate calculation service solely to perform this calculation.
Sources and Methodology
The calculator’s general-adult option uses the European Food Safety Authority adult Population Reference Intake of 0.83 g of protein per kilogram of body weight per day.
For comparison, the U.S. National Academies’ Dietary Reference Intake materials use an adult Recommended Dietary Allowance of 0.8 g/kg/day. The small difference reflects the reference framework being used rather than a meaningful personalized distinction for an individual.
The exercising option uses the 1.4–2.0 g/kg/day range described in the International Society of Sports Nutrition position stand for most exercising individuals.
Reference values describe populations or broad exercise contexts. They do not remove the need for individual assessment when health, performance or clinical circumstances make nutrition decisions more consequential.
Protein Intake Calculator FAQs
How does the protein intake calculator work?
It converts body weight to kilograms and multiplies that weight by the protein reference selected in grams per kilogram per day.
What does 0.83 g/kg of protein mean?
It means 0.83 grams of protein per kilogram of body weight per day. EFSA uses 0.83 g/kg/day as its Population Reference Intake for adults.
Why does the exercise option use 1.4–2.0 g/kg/day?
The International Society of Sports Nutrition position stand describes an overall daily protein intake of 1.4–2.0 g/kg/day as sufficient for most exercising individuals.
Can I enter my weight in pounds?
Yes. Select lb and the calculator converts pounds to kilograms using 1 kg = 2.2046226218 lb before applying the protein reference.
Is the result an exact protein requirement?
No. It is a mathematical estimate based on body weight and the selected reference context. Individual nutrition needs can differ.
Should I always choose the upper end of the range?
No. A range does not mean its highest value is automatically necessary or preferable. The appropriate intake depends on the context and individual circumstances.
What does the protein-per-meal result mean?
It simply divides the estimated daily range evenly by the selected number of meals. It is an arithmetic planning feature rather than a recommendation about meal timing or frequency.
Can this calculator be used during pregnancy?
The calculator’s adult options are not designed to estimate pregnancy-specific requirements. Pregnancy involves different reference values and individual circumstances, so appropriate professional guidance should be used.
Can someone with kidney disease use this result?
The calculator should not be used to determine protein intake for kidney disease or impaired kidney function. Protein targets may need individual clinical assessment.
Does the calculator create a diet or meal plan?
No. It estimates a protein range and can divide that number mathematically across meals. It does not determine foods, calories, nutrient adequacy or a personalized diet.