Finance Calculator

Simple financial calculation functions

Methods include

• Present to future value
• Future to present value
• Insert rate from present / future values
• RSI with given values / length
• SMA (simple moving average) with given values / length
• ATR (Average True Range)

function presentToFutureValue(presentValue: number, interestRate: number, periods: number): number;
function futureToPresentValue(futureValue: number, interestRate: number, periods: number): number;
function interestRateFromPresentFuture(
  presentValue: number,
  futureValue: number,
  periods: number,
): number;
function calculateSMA(valuesArr: number[], length: number): number;
function calculateATR(highs: number[], lows: number[], length: number): number;
function calculateRSI(valuesArr: number[], length: number): number;