RSI Calculator & Guide
The Relative Strength Index (RSI) measures the speed and change of price movements on a scale from 0 to 100. Developed by J. Welles Wilder in 1978, it remains one of the most widely used momentum indicators. Paste your closing prices to calculate RSI or use the guide section below.
RSI Interpretation Guide
Selling pressure has been intense. Asset may be undervalued or approaching a reversal. Wait for RSI to cross back above 30 before acting.
Buying pressure excessive. Often precedes pullbacks. In strong uptrends RSI can stay above 70 for extended periods — use context.
Normal operating range. In strong uptrends, 50 acts as support. In downtrends, 50 acts as resistance. RSI crossing 50 is a trend signal.
Price makes a lower low but RSI makes a higher low. Hidden buying pressure — often precedes a reversal to the upside.
Price makes a higher high but RSI makes a lower high. Weakening momentum — often precedes a price decline or reversal.