What do stochastic 80 and 20 mean?

They are common overbought and oversold reference levels. They describe location in a range and are not probabilities of reversal.

Is stochastic the same as RSI?

No. Stochastic compares the close with a recent high-low range, while RSI compares smoothed upward and downward price changes.

What does 14,3,3 mean?

A common slow-stochastic convention uses a 14-bar range, three-period smoothing of raw %K and a three-period average for %D. Confirm the platform's convention.

Glossary

What Is the Stochastic Oscillator? %K and %D

The stochastic oscillator measures where a candle's close sits within a recent high-low range, usually on a 0–100 scale. %K is the main calculation and %D is a smoothed signal line. A high reading means the close is near the top of the range, not that the market must fall.

The basic formula

Raw %K = 100 × (close − lowest low) ÷ (highest high − lowest low) over the chosen lookback. %D is an average of %K; slow variants smooth %K first.

If the range is ₹100–₹120 and the close is ₹116, raw %K is 80. That does not mean there is an 80% chance of a fall.

When the high and low are identical, the formula has a zero denominator. Implementations need an explicit missing-value or flat-range convention.

How to interpret a crossover

A %K cross above %D shows a change in relative short-term momentum under that smoothing method. It does not specify position size, stop distance, exit timing or whether the broader market favours the setup.

In a strong uptrend, stochastic can stay above 80 for many candles. Selling solely because it is “overbought” confuses momentum with inevitable reversal.

Compare like with like

Record the range length, %K smoothing, %D smoothing and timeframe. Daily and five-minute readings are not interchangeable. Compare with RSI to understand the different calculation rather than assuming two oscillators provide independent confirmation.

Limitations

Fast and slow variants have different smoothing.
Repeated crosses in a strong trend can produce premature reversal signals.

Frequently asked questions

What do stochastic 80 and 20 mean?: They are common overbought and oversold reference levels. They describe location in a range and are not probabilities of reversal.
Is stochastic the same as RSI?: No. Stochastic compares the close with a recent high-low range, while RSI compares smoothed upward and downward price changes.
What does 14,3,3 mean?: A common slow-stochastic convention uses a 14-bar range, three-period smoothing of raw %K and a three-period average for %D. Confirm the platform's convention.

Last updated: 5 November 2026