jp-healthmeasurements - Calculating Health Measurements Made Easy
Are you building a health/fitness application and don't feel like doing all the calculations for things like BMI, Body Fat Percentage, Daliy Calories Needed, and more?
jp-healthmeasurements is compatible with both the metric and imperial measurement systems and allows you to calculate some of the most common health/fitness related measurements without having to do any of the Math yourself
Health Calculations
- bodyMassIndex
- waistToHeightRatio
- caloriesNeeded
- bodyFatPct
- leanBodyFat
- dailyMacros
Utility Functions for Converting Units
- cmToInches
- inchesToCentimeters
- poundsToKilos
- kilosToPounds
- caloriesToGrams
Installation
npm i jp-healthmeasurements
Import into project
import { bodyMassIndex, waistToHeightRatio, caloriesNeeded, bodyFatPct, leanBodyMass, dailyMacros, } from 'jp-healthmeasurements';
How It Works
bodyMassIndex
bodyMassIndex(weight: number, height: number, imperial?: boolean): number
- weight is specified as kgs || lbs
- height is specified as cms || inches
- if using the metric system imperial is not needed or can be false
- if using the imperial system imperial must be true
Metric
bodyMassIndex(83.9146, 165.1); returns 30.79
bodyMassIndex(83.9146, 165.1, false); returns 30.79
Imperial
bodyMassIndex(185, 65, true); returns 30.78
** Due to some approximations on the agreed upon formulas the results may vary between systems. The differences are statistically insignificant and can be ignored. **
waistToHeightRatio
waistToHeightRatio(waist: number, height: number, imperial?: boolean): number
- waist is specified as cms || inches
- height is specified as cms || inches
- if using the metric system imperial is not needed or can be false
- if using the imperial system imperial must be true
Metric
waistToHeightRatio(91.44, 165.1); returns 55.38
Imperial
waistToHeightRatio(36, 65, true); returns 55.38
caloriesNeeded
caloriesNeeded(weight: number, height: number, age:number, male: boolean, imperial?: boolean): number
- weight is specified as kgs || lbs
- height is specified as cms || inches
- age is specified in years
- male is a boolean: true or false depending on gender
- if using the metric system imperial is not needed or can be false
- if using the imperial system imperial must be true
Metric
caloriesNeeded(83.9146, 165.1, 30, true); returns 1726.02
Imperial
caloriesNeeded(185, 65, 30, true, true); returns 1725.88
bodyFatPct
bodyFatPct(bmi: number, age:number, male: boolean): number
- bmi is a number returned from the bodyMassIndex method above
- age is a number specified in years
- male is a boolean: true or false depending on gender
bodyFatPct(30.78, age:30, male: true) returns 27.64
leanBodyMass
leanBodyMass(weight: number, height:number, male: boolean, imperial?: boolean): number
- weight is specified as kgs || lbs
- height is specified as cms || inches
- male is a boolean: true or false depending on gender
- if using the metric system imperial is not needed or can be false
- if using the imperial system imperial must be true
Metric
leanBodyMass(83.9146, 165.1, true); returns 59.03
Imperial
leanBodyMass(185, 65, true, true); returns 59.03
dailyMacros
dailyMacros(calories: number, fat: number = .20, carbs: number = .55, protein: number = .25): Macros
** Returns a 'Macros' object **
Macros { fCal: number, fGram: number, cCal: number, cGram: number, pCal: number, pGram: number }
** Unless otherwise specified the macro values are predefined based on CDC recommendations **
- fat = 20%
- carbs = 55%
- protein = 25%
Calculate the calories parameter from the caloriesNeeded method above
dailyMacros(1726.02) returns
{ "fCal": 345.2, "fGram": 38.36, "cCal": 949.31, "cGram": 237.33, "pCal": 431.5, "pGram": 107.88 }
dailyMacros(1726.02, .25, .45, .30) returns
{ "fCal": 431.5, "fGram": 47.94, "cCal": 776.71, "cGram": 194.18, "pCal": 517.81, "pGram": 129.45 }