# Carbohydrate Calculator

> Estimate daily calorie needs and convert a selected carbohydrate share into grams, with a 45–65% reference interval and 130-gram adult comparison.

Page: https://askcalculators.com/calculator/carbohydrate-calculator/
Definition: https://askcalculators.com/calculator/carbohydrate-calculator/definition.json
JSON Schema: https://askcalculators.com/calculator/carbohydrate-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/carbohydrate-calculator/?unitSystem=metric&sex=male&age=30&formula=mifflin&weightKg=70&heightCm=175&activity=moderate&carbPercent=50

## Inputs
- unitSystem: Units; type=select; required; default=metric; values=metric|imperial
- sex: Sex used by equation; type=select; required; default=male; values=male|female
- age: Age; type=number; required; default=30; min=18; max=100
- formula: BMR equation; type=select; required; default=mifflin; values=mifflin|harris|katch
- bodyFatPercent: Body fat; type=percent; required; default=20; min=1; max=79; showWhen=formula:katch
- weightKg: Weight; type=number; required; default=70; min=1; max=500; showWhen=unitSystem:metric
- heightCm: Height; type=number; required; default=175; min=50; max=300; showWhen=unitSystem:metric
- weightLb: Weight; type=number; required; default=154; min=2; max=1100; showWhen=unitSystem:imperial
- feet: Height feet; type=number; required; default=5; min=1; max=9; showWhen=unitSystem:imperial
- inches: Height inches; type=number; required; default=9; min=0; max=11.9; showWhen=unitSystem:imperial
- activity: Activity level; type=select; required; default=moderate; values=sedentary|light|moderate|active|veryActive|extraActive
- carbPercent: Target carbohydrate share; type=percent; required; default=50; min=5; max=80

## Outputs
- targetCarbs: Target carbohydrate amount; format=number; primary
- referenceRange: 45–65% reference range; format=text
- calories: Estimated daily energy; format=number
- targetCaloriesFromCarbs: Calories from carbohydrate; format=number
- minimumComparison: 130 g comparison; format=text

## Formula
Daily energy = BMR × activity factor; carbohydrate grams = calories × carbohydrate share ÷ 4.

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

Notice: Carbohydrate needs vary with health, pregnancy, medicines, and activity. Do not use this estimate to manage diabetes or another condition without qualified guidance.