This calculator works out the Relative Strength Index (RSI) using the standard Wilder formula, based on your average gain and average loss over the period, helping identify overbought or oversold conditions.
Enter your average gain and average loss over your chosen period, and the calculator returns the RSI value and its interpretation, see our guide on how traders actually use RSI for more context.
This calculator is for educational purposes only. Enter average loss as a positive number.
14 periods is the widely used conventional default, established when Wilder originally developed the indicator, some traders adjust this shorter for more sensitivity or longer for smoother, less frequent signals, depending on their specific timeframe and style.
RSI above 70 is generally considered overbought, suggesting the recent upward momentum may be overextended, RSI below 30 is generally considered oversold, suggesting downward momentum may be overextended, these are conventional thresholds, not fixed rules that guarantee a reversal.
Yes, particularly during strong trending markets, RSI can remain above 70 or below 30 for extended stretches without an immediate reversal, this is precisely why many traders combine RSI with trend context rather than trading the overbought/oversold levels in isolation.
RSI is bounded between 0-100 and focuses specifically on the ratio of average gains to average losses, MACD tracks the relationship between two moving averages and isn't bounded to a fixed range, many traders use both together as a cross-check.
Yes, this calculator uses the standard Wilder RSI formula based on average gains and losses over your specified period, the same underlying calculation used across virtually all major trading platforms.