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Adult Protein, Carbohydrate and Fat Calculator

See the protein RDA from body weight and convert adult protein, carbohydrate and fat AMDR percentages into daily gram ranges—clearly labelled as healthy-adult references, not individualized nutrition targets.

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Protein and Macronutrient Calculator

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Healthy-adult reference

Weight and daily energy

RDA · AMDR

Protein and carbohydrate use 4 kcal/g; fat uses 9 kcal/g. Results are rounded to one decimal gram.

Daily reference

Protein RDA and AMDR gram ranges

Adults 19+
Protein RDA from body weight—0.8 g/kg/day
Protein · 10–35%—
Carbohydrate · 45–65%—
Fat · 20–35%—
Energy scenario—

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Quick answer

How many grams of protein, carbohydrate and fat should an adult consume per day?

The protein RDA for generally healthy adults is 0.8 g per kilogram of body weight per day. Adult AMDRs allocate 10–35% of energy to protein, 45–65% to carbohydrate and 20–35% to fat. This tool converts those percentages with 4 kcal/g for protein and carbohydrate and 9 kcal/g for fat.

How to use this tool

  1. Enter the body weight of a generally healthy adult aged 19 or older and the daily energy used for the scenario
  2. Read protein RDA separately from the AMDR-derived protein, carbohydrate and fat gram ranges
  3. Review the health boundary and primary sources before planning food, or export Print, Excel, PDF, TXT or PNG if useful

How the calculation works

Weight accepts one decimal from 30–300 kg and energy accepts a whole 800–6,000 kcal/day. Protein RDA = weight × 0.8. Each gram boundary = energy × lower or upper percentage ÷ kcal per gram. Calculation uses integer tenths of a gram and rounds half up only at the end. The RDA is intended to be sufficient for nearly all healthy people in the life-stage group; it is not a universal minimum or optimum. AMDR is an energy-distribution framework and does not assess food quality.

Examples

Example Input Expected result
Protein RDA by weight 
Body weight 70 kg
 Protein RDA 56.0 g/day
Ranges at 2,000 kcal 
Energy 2,000 kcal/day
 Protein 50.0–175.0 g, carbohydrate 225.0–325.0 g and fat 44.4–77.8 g/day
Ranges at 2,400 kcal 
Energy 2,400 kcal/day
 Protein 60.0–210.0 g, carbohydrate 270.0–390.0 g and fat 53.3–93.3 g/day

Limitations

  • For generally healthy adults aged 19 or older only; not for children, teenagers, pregnancy or breastfeeding
  • Not for setting protein intake in kidney or liver disease, malnutrition, eating disorders or clinical nutrition care
  • AMDR is an energy-distribution range and does not assess food sources, quality, fibre, fatty-acid profile or amino-acid quality
  • Entered energy is a user scenario; this tool does not calculate energy requirements or a weight goal
  • Results are not medical advice, an athlete meal plan or an individualized weight-loss target

Frequently asked questions

Is 0.8 g/kg a protein minimum or the optimum for everyone?

Neither is the RDA definition. It is a reference intended to be sufficient for nearly all healthy people in its life-stage group. Individual needs and sport, weight-loss or treatment goals can differ.

Why does the protein RDA differ from the AMDR lower boundary?

They answer different questions. RDA is expressed per kilogram of body weight, while AMDR is a percentage of total energy, so different weights and energy values need not produce matching numbers.

Will adding every upper gram boundary equal the entered energy?

No. Do not combine every upper boundary. The ranges are constraints within which a chosen distribution should total about 100% of energy; this calculator does not automatically create one meal pattern.

Can I use this for kidney disease, pregnancy, breastfeeding or an eating disorder?

No. Those situations, as well as liver disease, malnutrition and clinical nutrition care, require individualized assessment by a qualified clinician or dietitian.

References

  1. AHRQ/NCBI Bookshelf — Evaluation of Dietary Protein and Amino Acid Requirements (2024) Verified 2026-08-04
  2. National Academies — Rethinking the Acceptable Macronutrient Distribution Range (2024) Verified 2026-08-04
  3. National Academies/NCBI Bookshelf — Dietary Reference Intakes for Energy Verified 2026-08-04

Content and calculation method last reviewed:

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