Moving Averages (SMA and EMA)
A moving average smooths out price data by calculating the average price over a defined number of periods, making the overall trend easier to see through short-term noise.
- Simple Moving Average (SMA): a straightforward average of the closing price over the chosen period (e.g., the last 50 candles).
- Exponential Moving Average (EMA): weights recent prices more heavily, so it reacts faster to new price changes than an SMA.
How it's typically used: price trading above a rising moving average is often read as a bullish signal, and below a falling one as bearish. Crossovers between two moving averages of different periods (e.g., a 50-period crossing above a 200-period) are commonly used as trend-change signals.
Limitation: moving averages are lagging indicators — based on past prices — so they tend to confirm a trend that's already underway rather than predict one before it starts, and can generate false signals in sideways, non-trending markets.
Relative Strength Index (RSI)
The RSI measures the speed and magnitude of recent price changes on a scale of 0 to 100, commonly used to identify potentially overbought or oversold conditions.
How it's typically used: readings above 70 are often considered overbought (suggesting a potential pullback), and below 30 oversold (suggesting a potential bounce). Some traders also watch for "divergence" — when price makes a new high or low but the RSI doesn't confirm it, sometimes read as an early warning of weakening momentum.
Limitation: in strong trends, the RSI can remain in "overbought" or "oversold" territory for extended periods without the price actually reversing, so using it in isolation to time reversals can lead to early or incorrect entries.
Moving Average Convergence Divergence (MACD)
The MACD shows the relationship between two moving averages of price (typically a 12-period and 26-period EMA), plotted alongside a "signal line" (usually a 9-period EMA of the MACD itself) and a histogram showing the difference between the two.
How it's typically used: a MACD line crossing above its signal line is often read as a bullish signal, and crossing below as bearish. The histogram's size is sometimes used to gauge momentum strength.
Limitation: like moving averages, the MACD is a lagging indicator built from moving averages, and can produce frequent false signals ("whipsaws") in choppy, non-trending markets.
Bollinger Bands
Bollinger Bands consist of a moving average (the middle band) plus two outer bands set a certain number of standard deviations above and below it, expanding and contracting based on market volatility.
How it's typically used: price touching or moving beyond the outer bands is sometimes read as a potentially overextended move, while a sharp narrowing of the bands ("squeeze") is often watched as a signal that a period of low volatility may precede a larger price move.
Limitation: price can "walk the band" — hugging the outer band for an extended period during a strong trend — without this signaling an imminent reversal, so touching a band alone isn't a reliable standalone signal.
Stochastic Oscillator
Similar in purpose to the RSI, the stochastic oscillator compares a specific closing price to its price range over a set period, also on a 0–100 scale, to gauge momentum and potential overbought/oversold conditions.
How it's typically used: readings above 80 are often considered overbought, and below 20 oversold, with crossovers between the oscillator's two lines (%K and %D) sometimes used as entry signals.
Limitation: like the RSI, it can remain in extreme territory during strong trends without an actual reversal occurring.
Average True Range (ATR)
Unlike the indicators above, the ATR doesn't indicate direction — it measures volatility, showing the average range a price has moved over a set period.
How it's typically used: many traders use the ATR to set stop loss distances proportional to current market volatility (a wider stop in high-volatility conditions, tighter in calmer ones), rather than using a fixed distance regardless of conditions — directly relevant to the position sizing and stop-loss principles covered in our risk management guide.
Volume
Volume shows how many units of an asset were traded during a given period, and is often plotted as a separate panel below the main price chart.
How it's typically used: a price move accompanied by high volume is often read as more significant or "confirmed" than the same move on low volume, which can suggest weaker conviction behind the move.
How to Use Indicators Without Over-Relying on Them
- Combine, don't stack similar indicators. RSI and the stochastic oscillator measure similar things (momentum); using several indicators that all measure the same underlying factor adds little additional information and can create a false sense of confirmation.
- Use indicators alongside price action and structure, such as the candlestick patterns and support/resistance levels covered elsewhere on this site, rather than as a standalone trading system.
- Understand that all popular indicators are derived from price (and sometimes volume) — none of them contain independent information beyond what's already visible on the chart; they simply present it differently.
- Backtest before relying on a specific indicator setup, since default settings aren't automatically optimal for every instrument or timeframe.
Frequently Asked Questions
Which indicator is best for beginners?
There's no single best indicator — many beginners start with a moving average and the RSI, since both are widely documented and relatively intuitive, then add others as they understand how each behaves in different market conditions.
Can indicators predict future price movement?
No — all standard technical indicators are calculated from past price (and sometimes volume) data. They describe what has already happened in a specific way, which can inform probability-based decisions, but they don't predict the future with certainty.
How many indicators should I use at once?
There's no fixed number, but using too many — especially ones that measure similar things — can create cluttered, sometimes conflicting signals. Many traders find a small, well-understood set (e.g., one trend indicator, one momentum indicator, and volume) more useful than a large number applied at once.
This content is for educational purposes only and does not constitute financial advice.
Ask about this guide
Get a plain-English explanation based on what you just read.