Calculator0
Protein Calculator
Use our free Protein Calculator to estimate daily protein intake and how much protein you may need in grams based on body weight, activity level and goal.
Use our free Protein Calculator to estimate daily protein intake and how much protein you may need in grams based on body weight, activity level and goal.
Enter your body weight, select your usual activity level and choose the planning goal. Calculator0 converts weight to kilograms when necessary, applies the factor assigned to your selections and returns an estimated daily protein target in grams.
The table shows the exact planning factors used by Calculator0. They change with activity and goal, so the calculator does not assign one fixed protein number to everyone.
| Activity | Maintain | Lose | Build |
|---|---|---|---|
| Sedentary | 0.9 g/kg | 1.2 g/kg | 1.4 g/kg |
| Moderate | 1.3 g/kg | 1.5 g/kg | 1.8 g/kg |
| High / intense | 1.6 g/kg | 2.0 g/kg | 2.2 g/kg |
A commonly cited adult Recommended Dietary Allowance is 0.8 grams of protein per kilogram of body weight per day for healthy adults. That reference is intended as a general requirement benchmark, not a universal optimal target for every sport, age, body-composition goal or health condition.
For context, the National Academies reference tables hosted by NCBI include adult protein RDAs. National Academies / NCBI reference.
Useful protein targets can differ with body size, activity, training, total energy intake, age, pregnancy, lactation and health status. The calculator therefore provides a planning estimate rather than claiming that one grams-per-day value is appropriate for every person.
That is why a single “grams per day” number should always be interpreted in the context of who is using it and why.
The food-planning section converts a gram target into approximate portions using simple reference values. Actual nutrition labels vary with brand, preparation, water content and serving size.
| Food | Reference value used by the tool |
|---|---|
| Egg | 6 g per egg |
| Cooked chicken breast | 31 g per 100 g |
| Tuna in water | 25 g per 100 g |
| Greek yogurt | 10 g per 100 g |
| Cooked lentils | 9 g per 100 g |
| Oats | 13 g per 100 g |
Use the package nutrition label or a reliable food database when precise intake tracking matters. The examples here are practical estimates for planning.
Protein can come from animal or plant foods. Animal foods such as eggs, dairy, fish and meat are common concentrated sources. Plant foods such as legumes, soy foods, grains, nuts and seeds can also contribute substantially to daily protein intake.
A varied diet matters because foods provide more than protein: they also contribute different amounts of fiber, fat, carbohydrate, vitamins and minerals. The calculator estimates grams of protein; it does not score overall diet quality.
After you have a daily target, divide it across the meals and snacks that fit your routine. You do not need to consume the entire amount at once. A practical plan is one you can consistently reach using realistic serving sizes and varied food sources.
| Daily target | 3 meals | 4 meals | 5 eating occasions |
|---|---|---|---|
| 90 g | 30 g each | 22–23 g each | 18 g each |
| 120 g | 40 g each | 30 g each | 24 g each |
| 150 g | 50 g each | 37–38 g each | 30 g each |
These divisions are arithmetic examples, not meal prescriptions. Use food preferences, total calories and any individualized health guidance to decide actual meals.
Protein is one macronutrient. If you are building a calories and protein calculator plan, use the protein target together with total calories rather than treating the numbers separately. If you also need an energy estimate, use the Calorie Calculator to estimate BMR and TDEE.
Remember that protein itself provides energy. When designing a full diet, protein, carbohydrate and fat must fit within the total energy intake rather than being planned as unrelated numbers.
| Body weight | Selection | Factor | Calculator0 target |
|---|---|---|---|
| 60 kg | Sedentary + maintain | 0.9 g/kg | 54 g/day |
| 70 kg | Moderate + maintain | 1.3 g/kg | 91 g/day |
| 70 kg | Moderate + build | 1.8 g/kg | 126 g/day |
| 80 kg | High + lose | 2.0 g/kg | 160 g/day |
| 90 kg | High + build | 2.2 g/kg | 198 g/day |
These examples explain the tool’s internal arithmetic. They should not be read as individualized clinical recommendations.
The most useful result comes from accurate body weight, realistic activity selection and sensible interpretation of the gram target.
Protein needs can change during growth, pregnancy, lactation, aging, illness and recovery. Kidney disease, liver disease and other medical conditions can also change appropriate protein intake. In these situations, a generic grams-per-kilogram preset may be inappropriate.
If protein intake is being adjusted for a diagnosed condition, use individualized guidance from a qualified clinician or registered dietitian rather than relying on the calculator alone.
To turn a daily gram target into food choices, use the protein value for the portion you actually eat. If a label lists 20 g of protein per 200 g serving and you eat 150 g, that portion contributes three quarters of the listed amount, or 15 g.
When a package lists values per 100 g, multiply the protein-per-100-g value by the food weight and divide by 100. This method works for meat, dairy, legumes, grains and mixed foods as long as the label or database value matches the food in front of you.
Food values vary by brand, preparation and water content, so Calculator0’s common-food examples are planning references rather than laboratory measurements of your exact meal.
Grams-per-kilogram calculations are straightforward once body weight is in kilograms. If your weight is in pounds, convert it first or use the page’s unit controls. The result depends on the factor selected by the tool.
| Weight | 0.8 g/kg | 1.2 g/kg | 1.6 g/kg | 2.0 g/kg |
|---|---|---|---|---|
| 50 kg | 40 g | 60 g | 80 g | 100 g |
| 60 kg | 48 g | 72 g | 96 g | 120 g |
| 70 kg | 56 g | 84 g | 112 g | 140 g |
| 80 kg | 64 g | 96 g | 128 g | 160 g |
| 90 kg | 72 g | 108 g | 144 g | 180 g |
These columns demonstrate the arithmetic only. The appropriate factor depends on context and should not be inferred from the table alone.
The adult RDA of 0.8 g/kg/day is a general reference intended to meet the needs of nearly all healthy adults in the population group for which it was established. It should not be confused with a universal target for every athlete, dieting phase, older adult or clinical situation.
Exercise-focused guidance often discusses higher intakes because training, energy restriction and muscle-building goals change the practical question being asked. Calculator0 therefore presents its own activity-and-goal factors separately from the RDA reference instead of labeling one number as correct for everyone.
Dietary proteins are made of amino acids. The body can make some amino acids, while essential amino acids must come from the diet. Foods differ in amino-acid pattern and digestibility, so the same gram total does not describe every nutritional characteristic of a meal.
Animal proteins are often complete sources of essential amino acids. Plant-based diets can also meet protein needs through adequate total intake and a varied mix of foods such as legumes, soy foods, grains, nuts and seeds. It is not necessary for every single meal to contain every source in identical proportions.
Cooking changes water content, so 100 g of raw meat and 100 g of cooked meat are not nutritionally identical portions by weight. Grains and legumes often gain water during cooking, while meat can lose water. This is why a nutrition value must match the food state you weighed.
If a label or database entry says “cooked chicken breast,” compare it with cooked weight. If it says “raw,” use raw weight. Mixing the two can make protein totals look more precise than they really are.
Protein contributes about 4 kcal per gram. A target of 120 g protein therefore represents roughly 480 kcal from protein before carbohydrate and fat are counted. This does not mean a higher protein number can be added without changing the rest of the diet; all macronutrients contribute to the total energy plan.
If energy intake is also a goal, compare the protein target with the Calorie Calculator so the numbers are considered together.
Protein powder is a convenient food product, not a requirement for meeting a protein target. Meat, fish, eggs, dairy, soy foods, legumes and many mixed meals can all contribute. Supplements may be useful when convenience, appetite or food access makes the target difficult to reach, but they do not replace the vitamins, minerals, fiber and variety supplied by a balanced diet.
When using a supplement, calculate from the nutrition label rather than assuming every scoop contains the same amount across brands.
It multiplies body weight in kilograms by the factor assigned to the selected activity level and goal.
There is no single number for everyone. Calculator0 gives a planning estimate based on body weight, activity and goal.
It means 0.8 grams of protein for each kilogram of body weight and is a commonly cited adult RDA reference for healthy adults.
No. It is a general adult requirement reference, not a universal optimal target for every age, activity level, sport or health condition.
Multiply body weight in kilograms by the grams-per-kilogram factor being used.
Yes. It includes common food reference values to estimate how portions contribute to the daily target.
You can divide the daily target across the number of meals or eating occasions that fits your routine.
Plant foods can contribute substantially to protein intake; total intake and overall dietary variety matter.
No. Use Protein Calculator for the protein target and Calorie Calculator for BMR/TDEE and daily energy estimates.
Medical conditions can change appropriate protein intake. Individualized clinician or dietitian guidance is more appropriate.
No. They are planning references; actual nutrition varies by food, brand, preparation and serving size.
Yes. Protein contributes about 4 kcal per gram in standard nutrition calculations.
Use the same food state as the nutrition value you are using; cooking changes water content and therefore values per 100 g.
No. Protein can be obtained from ordinary foods; supplements are mainly a convenience for some people.
Multiply the listed protein by the portion you ate divided by the label serving size.
No. Some conditions change appropriate protein intake, so individualized professional guidance may be needed.