This library is stable and being used in production (as of Apr 2021).
A JS library to convert and format odds.
Odds are constructed by calling the public from(format, odds) constructor:
import * as oddslib from 'oddslib'; // Create from decimal/European odds let odds = oddslib.from('decimal', 1.20); // Create from American/Moneyline odds let odds = oddslib.from('moneyline', -500); // Create from Hong Kong odds let odds = oddslib.from('hongKong', .20); // Create from implied probability let odds = oddslib.from('impliedProbability', .5) = oddslib.from('impliedProbability', '50%'); // Create from UK/fractional odds let odds = oddslib.from('fractional', 5/2) = oddslib.from('fractional', '5/2') = oddslib.from('fractional', 2.5); // Create from Malay odds let odds = oddslib.from('malay', 0.5); // Create from Indonesian odds let odds = oddslib.from('indonesian', -5.0);
Odds can then be converted using the to(format, options?) instance method:
let odds = oddslib.from('decimal', 1.20); odds.to('decimal'); // == 1.2 odds.to('moneyline'); // == -500 odds.to('hongKong'); // == 0.2 odds.to('impliedProbability'); // == 0.83̅ odds.to('fractional'); // == "1/5" odds.to('malay'); // == 0.2 odds.to('indonesian'); // == -5.0
The default options are:
{ precision: null, // Return a rounded value correct to the nth digit. Do not round if null. percentage: false, // Return IP odds as a percentage string. No effect on other formats. }
Fractions are also approximated if the precision option is specified, by using the algorithm at http://www.mindspring.com/~alanh/fracs.html.
// No approximation oddslib.from('decimal', 2.33).to('fractional'); // === "133/100" // Approximate up to 2nd decimal digit oddslib.from('decimal', 2.33).to('fractional', {precision: 2}); // === "4/3"