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Protein Intake Calculator

Use this protein intake calculator to estimate daily protein grams from body weight and a chosen g/kg target.

Last reviewed June 6, 2026Source note includedPlanning estimateNo expert review claimed

Live calculator

Protein intake

Daily protein target62 g/day

0.8 g/kg x 77.1 kg body weight.

Protein per meal21 g

If spread across 3 meals per day.

Adult RDA baseline62 g/day

Uses 0.8 g/kg for healthy adults as a baseline, not a disease-specific plan.

Use this as a planning estimate, not medical advice. Medical conditions, medication, pregnancy, eating disorder history, or disease-specific nutrition needs should be handled with a qualified professional.

Quick answer

Protein Intake Calculator: what it calculates

Protein Intake Calculator calculates daily protein target from weight, protein target, and meals per day. The visible formula is Protein grams per day = body weight in kg x grams per kg target.

ResultDaily protein target
InputsWeight, Protein target, Meals per day
FormulaProtein intake formula

Formula

Protein intake formula

Protein grams per day = body weight in kg x grams per kg target

The adult RDA baseline is 0.8 g/kg for healthy adults; active targets are planning estimates.

How to use

Steps

  1. Enter body weight in pounds.
  2. Choose a protein target.
  3. Enter meals per day to split the target.
  4. Compare the selected target with the adult RDA baseline.

Example

Sample calculation

Weight170 lb
Target0.8 g/kg
Protein62 g/day

Calculator use

Best for

  • Use this protein intake calculator to estimate daily protein grams from body weight and a chosen g/kg target.
  • Estimating body, hydration, protein, calorie, macro, or fitness planning numbers with assumptions visible.
  • Comparing rough scenarios before tracking trends or discussing the result with a qualified professional.
  • Keeping formula inputs visible so the number can be checked later instead of treated as a diagnosis.

Before relying on it

Check first

  • Treating a screening or planning estimate as medical, nutrition, eating-disorder, pregnancy, or disease-specific advice.
  • Ignoring age, sex, medication, body composition, training status, medical history, heat, illness, or measurement method.
  • Changing diet, hydration, or training aggressively from one calculator result without appropriate context.

Details

What to know before using the result

These notes make the assumptions explicit, especially where the same search query can mean slightly different things.

RDA baseline0.8 g/kg

This is a general adult baseline and may not match athletic, older adult, pregnancy, illness, or clinical nutrition needs.

Target choiceGoal dependent

Training, dieting, age, appetite, kidney disease, and medical history can change what target is appropriate.

Meal splitPlanning only

Per-meal protein is a convenience estimate; total daily intake and food quality still matter.

Source notes

References used for this calculator

NCBI BookshelfStates that the current recommended daily allowance of protein for healthy adults is 0.8 g/kg.PMCReviews U.S. protein recommendations and notes the adult RDA of 0.8 g/kg body weight.

Benchmarks

How to read the result

The calculator is a decision aid, not a fixed rule. Use the output to compare scenarios and document your assumptions. Benchmark ranges are broad planning heuristics unless this page names a specific source for the range.

0.8 g/kg: Adult RDA baseline.

General healthy adult baseline, not a performance target.

1.2 g/kg: Active planning.

A common planning target for active people, depending on context.

1.6 g/kg: Higher training target.

Often used by strength-training calculators, but individual needs vary.

Calculator accuracy

Methodology and assumptions

The formula, inputs, example, and limitations are shown so the result is checkable, not just a number in a box.

Formula

Protein grams per day = body weight in kg x grams per kg target

Inputs used

Weight, Protein target, Meals per day

Limitations

Health results are screening or planning estimates. Age, body composition, medication, medical history, pregnancy, and professional guidance can change the right interpretation.

Last reviewed

June 6, 2026

Cite this page

Toolkit Shelf. Protein Intake Calculator. Last reviewed June 6, 2026. https://toolkitshelf.com/tools/protein-intake-calculator

FAQ

Common questions

How much protein do I need per day?

A general healthy adult RDA baseline is 0.8 grams per kilogram of body weight. Higher planning targets may be used for training or specific goals.

Is more protein always better?

No. Needs vary, and medical conditions such as kidney disease can change protein guidance.

How do I convert pounds to kilograms for protein?

Multiply pounds by 0.4536, then multiply kilograms by the grams-per-kilogram target.

When should I ask a clinician?

Ask a clinician or qualified nutrition professional when pregnancy, medication, medical history, eating disorder risk, symptoms, or disease-specific guidance matters.

Why can health formulas be misleading?

Health formulas simplify age, sex, body composition, training status, measurement method, pregnancy, and medical context into a planning estimate.

Is this medical advice?

No. Health calculators are screening or planning tools and do not diagnose, treat, or replace professional medical or nutrition guidance.