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An 80 kilogram adult eating 2,400 kcal
Enter 80 kg and 2,400 kcal. The RDA is 0.8 × 80, which is 64 grams. The AMDR band is 10 to 35 percent of 2,400 kcal, counted at 4 kcal per gram, so 60 to 210 grams.
Weight: 25% lower
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Weight: 25% higher
Change weight to 100 kg while keeping the other example values the same.
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Quick answer
What does the Protein intake target calculate?
How many grams of protein does the adult RDA give for your weight? This calculator uses weight, and daily calories to estimate adult protein rda in grams immediately in your browser.
With the values currently entered, the result is 56 g — National Academies adult protein RDA. It also shows weight used, rda rate, amdr low (10% of calories), amdr high (35% of calories), and calories used.
How to use the Protein intake target
- Replace the example values with your own numbers.
- Review the result and supporting figures as they update automatically.
- Check the formula and assumptions before using the estimate for a decision.
Inputs used
- Weight — entered in kg
- Daily calories — entered in kcal
Protein intake target formula
RDA grams = 0.8 × kg; AMDR grams = (calories × 10–35%) ÷ 4 kcal/g
Assumptions
- The National Academies adult RDA is 0.8 g of protein per kilogram of body weight. That is 56 g at the 70 kg male reference weight and 46 g at the 57 kg female reference weight.
- The adult AMDR is 10–35% of energy from protein. FDA counts protein at 4 kcal per gram, so the gram range is calories × 10–35%, then divided by 4.
Verify the inputs
Authoritative sources
These sources explain the definitions, factors, or rules behind this tool. Their geographic scope is shown because an official source for one country is not automatically valid somewhere else.
Sets the adult protein RDA at 0.8 g per kilogram of body weight and the adult AMDR at 10–35% of energy.
Calories on the Nutrition Facts labelUS Food and Drug AdministrationScope: US food labeling; Atwater energy factorsCounts protein at 4 calories per gram, which turns an AMDR percentage of calories into grams.
Sources do not endorse Calculum. Check the source date, scope, and your own documents before making a financial, tax, insurance, or reporting decision.
Practical guide
Protein intake target example and edge cases
The adult protein RDA is 0.8 grams per kilogram. At 70 kg that is 56 grams. Type daily calories too if you want the 10 to 35 percent AMDR range in grams.
Example: An 80 kilogram adult eating 2,400 kcal
Enter 80 kg and 2,400 kcal. The RDA is 0.8 × 80, which is 64 grams. The AMDR band is 10 to 35 percent of 2,400 kcal, counted at 4 kcal per gram, so 60 to 210 grams.
- Weight
- 80 kg
- Daily calories
- 2,400 kcal
Calculated result64 gNational Academies adult protein RDA
Start with the RDA. The AMDR band is much wider. Compare the calorie calculator if you want the 2,400 figure from size and activity instead of typing it.
Example results use the default display profile. The calculator above follows your selected country and units.
How to read the result
- The RDA is a minimum adequacy target for healthy adults. It is not a sports target and not a meal plan.
- The AMDR band uses the calories you enter. Leave calories at 0 if you only want the weight-based RDA.
Edge cases worth checking
The person is pregnant or training hard
The 0.8 g per kg figure is the adult RDA, not a pregnancy or athlete prescription. Those cases need a clinician or a sports dietitian.
Calories are a guess
A wrong calorie figure moves only the AMDR band. The RDA still follows weight. Use the calorie calculator when you want a published energy estimate first.
What changes the result most
Weight
Measure weight with the same unit shown beside the input. Convert first if your source uses another unit.
Daily calories
Measure daily calories with the same unit shown beside the input. Convert first if your source uses another unit.
Try a different scenario
Small changes show whether the answer is stable or sensitive.
Weight: 25% lower
60 kg48 gNational Academies adult protein RDA
Weight: 25% higher
100 kg80 gNational Academies adult protein RDA
Daily calories: 25% higher
3,000 kcal64 gNational Academies adult protein RDA
Common mistakes
Check weight
The National Academies adult RDA is 0.8 g of protein per kilogram of body weight. That is 56 g at the 70 kg male reference weight and 46 g at the 57 kg female reference weight. Make sure this matches the number you enter.
Keep daily calories consistent
The adult AMDR is 10–35% of energy from protein. FDA counts protein at 4 kcal per gram, so the gram range is calories × 10–35%, then divided by 4. Use the same units and time period throughout the calculation.
Do not rely on one protein intake target scenario
Run a cautious case and an optimistic case. The range is often more useful than one exact-looking number.
Use this result well
How many grams of protein does the adult RDA give for your weight?
Use it for activity planning, not medical diagnosis or individualized health advice.