RSI Calculator
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The RSI Calculator will let you paste any closing price series and instantly compute the Relative Strength Index using the standard 14-period Wilder smoothing method. It will visualise overbought (>70) and oversold (<30) zones on an interactive chart so you can quickly gauge momentum before placing a trade.
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14-period Wilder RSI — the standard calculation used by professional traders and all major charting platforms.
Overbought / oversold zones — visual bands at 70 and 30 with color-coded signal labels.
Paste any price series — CSV or space-separated closing prices, no account or API key required.
Configurable period — adjust the lookback window from 2 to 50 periods for different trading styles.