A growing set of free, browser-based calculators. Every one shows the math behind the indicator, where it is traditionally used, and the exact Pine Script that produces the same value on a TradingView chart. Nothing to install, and your data never leaves your browser.
Compute the Relative Strength Index from a price series.
Open toolCompute the MACD line, signal line, and histogram.
Open toolCalculate %K and %D from high, low, and close data.
Open toolCompute the Commodity Channel Index from OHLC data.
Open toolCalculate Williams %R from high, low, and close data.
Open tool