New York Subway Card Refill Caculator.Use this calculator to minimize the leftover amount when purchasing additional rides on a stored-value MetroCard. Given the current balance, a table with all possible rides will be shown. The leftover amount is no more than a nickel when adding more than $5 to the card. The display assumes a per-ride cost of $2.50.This app is most likely to be useful to tourists or other occasional users of the New York MTA Subway system.Application does not require any special permissions and works offline.