# Protein Calculator

> Estimate a weight-based daily protein range for general adult, older-adult, endurance, strength, calorie-deficit, or pregnancy contexts.

Page: https://askcalculators.com/calculator/protein-calculator/
Definition: https://askcalculators.com/calculator/protein-calculator/definition.json
JSON Schema: https://askcalculators.com/calculator/protein-calculator/schema.json
Version: 2.0.0
Maintained by: AskCalculators (software project; not a credentialed reviewer)
Qualified review: pending. Automated checks do not establish professional approval.
Page status: Live
Review status: Pending

## Use
Open the calculator page and enter values. Query-string parameters can restore and bookmark a calculation.
Example: https://askcalculators.com/calculator/protein-calculator/?unitSystem=metric&weightKg=70&scenario=general&meals=4

## Inputs
- unitSystem: Weight units; type=select; required; default=metric; values=metric|imperial
- weightKg: Body weight; type=number; required; default=70; min=20; max=500; showWhen=unitSystem:metric
- weightLb: Body weight; type=number; required; default=154; min=44; max=1100; showWhen=unitSystem:imperial
- scenario: Activity or life-stage reference; type=select; required; default=general; values=general|older|endurance|strength|weightLoss|pregnancy
- meals: Meals or feedings per day; type=number; required; default=4; min=1; max=10

## Outputs
- proteinRange: Estimated daily protein range; format=text; primary
- midpoint: Range midpoint; format=number
- perMeal: Midpoint per meal; format=number
- energyRange: Energy from protein; format=text
- factor: Weight factor; format=text

## Formula
Protein range = body weight (kg) × scenario-specific grams-per-kilogram interval.

## Rules
- Empty optional inputs are undefined, not zero.
- Hidden conditional inputs are ignored.
- Do not invent missing required inputs.

Notice: Protein needs can change with kidney disease, pregnancy, age, training, illness, and overall energy intake. This is not individualized nutrition advice.