Stochastic Oscillator — Complete Reference
Momentum oscillator comparing current close to recent high-low range.
What Stochastic measures
Stochastic measures where the current close sits within the high-low range over a lookback period (typically 14). Output scales 0-100. Above 80 = overbought, below 20 = oversold. The %K (fast line) plus %D (3-period SMA of %K) creates the classic dual-line oscillator.
Fast vs Slow Stochastic
Fast Stochastic: raw %K and %D as described. Slow Stochastic: %K is smoothed first (becomes the slow line), then %D smooths the smoothed %K further. Slow Stochastic is more popular because fewer false signals.
Reading Stochastic signals
Bullish: %K crosses above %D in oversold territory (below 20). Bearish: %K crosses below %D in overbought territory (above 80). Divergence with price is also a strong signal — same logic as RSI/MACD divergence.
Stochastic vs RSI
Both are momentum oscillators in the 0-100 range. RSI smooths more (less noise, slower signals). Stochastic is more responsive (faster signals, more noise). Pick one and learn it deeply. Most experienced traders prefer RSI for clarity.
Where Stochastic fails
Strong trends. Stochastic stays in extreme territory throughout a trend. Combining with trend filter (ADX, moving averages) is essential. Counter-trend Stochastic signals in confirmed trends lose money.
Stochastic crossover settings
Standard: 14-3-3 (lookback, %K smoothing, %D smoothing). Day trading: 5-3-3 (faster, more signals). Position trading: 21-7-7 (slower, fewer signals). Test on your timeframe before deploying.
Combining with price action
Stochastic at extremes near significant support/resistance is much higher conviction than Stochastic alone. Always look at location before acting on the oscillator reading.
Free Stochastic tools
SultraxAI scans Stochastic plus other momentum indicators across ~100 stocks and 12 cryptos. Published win rates included. Try it →