Stochastic Oscillator

Overview

The Stochastic Oscillator compares a security's closing price to its price range over a given period, making it excellent for identifying overbought/oversold conditions and divergences in bounded ranges. It works especially well alongside the RSI for double confirmation of reversal zones in forex and stock markets. For best results, use Stochastic signals only in the direction of the larger trend identified by tools in our indicator guide library. Build it into a complete system by reviewing our trading strategies section.

How It Works

%K = (Current Close − Lowest Low) / (Highest High − Lowest Low) × 100. %D = 3-period SMA of %K. Default settings are 14, 3, 3. Readings above 80 are overbought; below 20 are oversold.

Key Signals

• %K crossing above %D from below 20 = bullish signal.
• %K crossing below %D from above 80 = bearish signal.
• Slow Stochastic (smoothed %K and %D) reduces noise for swing trading.
• Stochastic divergence from price can precede significant reversals.

Common Mistakes

• Trading Stochastic signals in strong trends — it stays overbought/oversold for extended periods.
• Using fast Stochastic on noisy timeframes — the slow version is more reliable.
• Not combining with trend analysis — Stochastic works best for entries in the direction of the trend.