Stochastic Oscillator

What Is the Stochastic Oscillator?

Developed by George Lane, the stochastic oscillator measures where the current closing price sits relative to the high-low range over a lookback period (default 14). The idea is simple: in uptrends, prices tend to close near their highs, and in downtrends, near their lows. The %K line is the raw calculation, and %D is a 3-period moving average of %K, acting as a signal line.

Stochastic Trading Signals

The primary signals are crossovers and overbought/oversold readings. When %K crosses above %D below the 20 level, it generates a buy signal. When %K crosses below %D above the 80 level, it generates a sell signal. Like RSI (Relative Strength Index), divergence between the stochastic and price is a powerful reversal signal. If USD/JPY makes a new low but the stochastic makes a higher low, bullish divergence suggests the downtrend is weakening.

Best Settings and Combinations

For swing trading on daily charts, the standard 14,3,3 setting works well. For shorter timeframes, 5,3,3 provides faster signals. The stochastic oscillator performs best in ranging markets where overbought and oversold levels are meaningful. In strong trends, it can stay overbought or oversold for long periods, generating premature reversal signals. Filter stochastic signals by trend direction using a Moving Average: only take buy signals when price is above the 200 EMA, and sell signals when below.