Beverage Calculator

Devloped by: Kyle Shervington

Developer's Note:

This tool was integrated into the client's Squarespace website as a code block. That is reason all the styling, HTML, and Javascript are in one file. That being said, this drink calculator will still be fully functional when launched independently, though it will look different than it does on the client's website.

Description	A tool that allows users to calculate how many drinks will be needed for their event, based on event duration and number of guests.
Client	Twyst Cocktail
Business Contact	Najee Wooten

Introduction

Although this tool was originally created for the mentioned client, it is free to use, or to be forked, for any other application. If used elsewhere, please attribute appropriately with a link to this repository.

Constants	Description
AVG_DRINKS_PER_HOUR	Average amount of drinks a single guest will have each hour
STD_WINE_PREF	simple Decimal representation of the percentage of guests who prefer wine
STD_BEER_PREF	simple Decimal representation of the percentage of guests who prefer beer
STD_SPIRIT_PREF	simple Decimal representation of the percentage of guests who prefer cocktails
STD_ALCFREE_PREF	simple Decimal representation of the percentage of guests who prefer non-alcoholic drinks
SPIRIT_SERVING_PER_BOTTLE	# of servings from a single 750 mL spirit/liquor bottle
WINE_SERVING_PER_BOTTLE	# of servings from a single 750 mL wine bottle
ALCFREE_SERVING_PER_BOTTLE	# of servings from a single 2 L mixer bottle

Simple View

Default	After Calculation

Inputs	Description
eventDurantion	Length of event (in hours)
guestCount	# of guests that will attend the event

Outputs	Description
totalDrinks	Total # of drinks to be served at the event
wineCount	# of 750 mL bottles of wine needed
beerCount	# of 12 oz. cans of beer needed
spiritCount	# of 750 mL bottles of spirit/liquor needed
alcFreeCount	# of 2 L bottles of mixer (likely soda) needed

Output Calculations

Variable values for following examples:

const AVG_DRINKS_PER_HOUR = 1.5;

const STD_WINE_PREF = 0.35;
const STD_BEER_PREF = 0.2;
const STD_SPIRIT_PREF = 0.35;
const STD_ALCFREE_PREF = 0.1;

const SPIRIT_SERVING_PER_BOTTLE = 16.0;
const WINE_SERVING_PER_BOTTLE = 5.0;
const ALCFREE_SERVING_PER_BOTTLE = 8.0;

let eventDuration = 1;
let guestCount = 50;

Examples:

totalDrinks = Math.ceil(AVG_DRINKS_PER_HOUR * eventDuration) * guestCount;

// ex.
// totalDrinks = (1.5 * 1) * 50
// totalDrinks = 1.5 * 50
// totalDrinks = 2 * 50 --Rounded up
// totalDrinks = 100

wineCount = Math.ceil(parseFloat(totalDrinks * STD_WINE_PREF) / WINE_SERVING_PER_BOTTLE);

// ex.
// wineCount = (100 * 0.35) / 5
// wineCount = 7

beerCount = Math.ceil(parseFloat(totalDrinks * STD_BEER_PREF));

// ex.
// beerCount = 100 * 0.2
// beerCount = 20

spiritCount = Math.ceil(parseFloat(totalDrinks * STD_SPIRIT_PREF) / SPIRIT_SERVING_PER_BOTTLE);

// ex.
// spiritCount = (100 * 0.35) / 16
// spiritCount = 2.1875
// spiritCount = 3 --Rounded up

bottlesOfSpirit = Math.ceil(parseFloat(totalDrinks * STD_SPIRIT_PREF) / SPIRIT_SERVING_PER_BOTTLE);

// Calculate # of bottles to be used as mixers, assuming 1:3 (spirit:mixer) ratio for cocktails
// ** 750 mL per spirit bottle; 2000 mL per mixer bottle **
mixerBottles = Math.ceil(((bottlesOfSpirit * 750.0) * 3.0) / 2000.0);

alcFreeCount = Math.ceil((parseFloat(totalDrinks * STD_ALCFREE_PREF) / ALCFREE_SERVING_PER_BOTTLE)) + mixerBottles;

// ex.
// bottlesOfSpirit = (100 * 0.35) / 16
// bottlesOfSpirit = 2.1875
// bottlesOfSpirit = 3 --Rounded up

// mixerBottles = ((3 * 750) * 3) / 2000
// mixerBottles = (2250 * 3) / 2000
// mixerBottles = 3.375
// mixerBottles = 4 --Rounded up

// alcFreeCount = ((100 * 0.1) / 8) + 4
// alcFreeCount = (10 / 8) + 4
// alcFreeCount = 1.25 + 4
// alcFreeCount = 2 + 4 --Rounded up
// alcFreeCount = 6

Alcohol-free drinks have to be used for both cocktails and for guests who will only drink alcohol-free beverages. Hence the above calculations.

Advanced View

Default	After Calculation

Inputs	Description
eventDurantion	Length of event (in hours)
guestCount	# of guests that will attend the event
advWineGuests	# of guests that will drink wine
advBeerGuests	# of guests that will drink beer
advSpiritGuests	# of guests that will drink cocktails Assuming these guests will only drink cocktails instead of unmixed spirits/liquor
advAlcFreeGuests	# of guests that will drink alcohol-free beverages

Inputs prefixed with adv are calculated as a percentage of total guestCount. That is, the user will enter the percentage of guests who prefer each drink, and the "# of guests" for that drink type will be derived. ex. guestCount = 20, user enters 25% for "% of guests who prefere wine"; Therefore, advWineGuests === 5.

Outputs	Description
totalDrinks	Total # of drinks to be served at the event
wineCount	# of 750 mL bottles of wine needed
beerCount	# of 12 oz. cans of beer needed
spiritCount	# of 750 mL bottles of spirit/liquor needed
alcFreeCount	# of 2 L bottles of mixer (likely soda) needed

Output Calculations

The major difference, in the advanced view, is that it uses user-inputted percentages to calculate guest drink preference rather than the standard preference percentages shown in the Constants Table above.