What are moving averages?
Written by an ex-institutional trader. What moving averages are, shown with a diagram, the difference between SMA and EMA, how the golden cross and death cross work, and how traders use them to read trend and dynamic support.
Direct answer
A moving average smooths price into a single flowing line by averaging it over a set number of periods, making the underlying trend easier to see through the noise. The two main types are the simple moving average (SMA), which weights all periods equally, and the exponential moving average (EMA), which weights recent prices more heavily so it reacts faster. The period, such as 20, 50 or 200, sets how much it smooths.
Traders use moving averages to read trend direction (price above a rising average is bullish), as dynamic support and resistance, and through crossovers. The best-known crossover signals are the golden cross (a faster average crossing above a slower one, bullish) and the death cross (the reverse, bearish). Moving averages lag price because they are built from past data, so they confirm trends rather than predict turns, and work best with the trend rather than against it.
What a moving average is
A moving average smooths price into a single flowing line by averaging it over a set number of periods. As each new period closes, the oldest drops out and the newest is added, so the line moves along with price, hence the name. Its job is to strip out the short-term noise that clutters a raw price chart and make the underlying trend easier to see.
A 50-day moving average, for instance, plots the average of the last 50 daily closes. The longer the period, the smoother and slower the line; the shorter the period, the closer it hugs price and the faster it reacts. That single choice, the period, is the main lever you control.
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SMA vs EMA
There are two main types, and the difference is how they weight the prices in their window:
- Simple moving average (SMA): every period gets equal weight. Smoother and slower, it lags more but gives fewer false signals. Favoured for longer-term trend reading.
- Exponential moving average (EMA): recent prices get more weight, so it reacts faster and turns sooner. More responsive but noisier. Favoured by shorter-term traders.
The diagram below shows the idea: a fast average tracking price closely and a slow average smoothing it out, with the crossover where the fast line moves above the slow one.
Golden cross and death cross
The best-known moving average signals are crossovers between a faster and a slower average, classically the 50 and the 200.
- Golden cross: the 50-period average crosses above the 200-period average, traditionally a bullish signal that a longer-term uptrend may be starting.
- Death cross: the 50 crosses below the 200, a bearish signal.
Both are lagging signals that confirm a trend already in motion rather than predicting one, so they are best treated as context for the bigger picture, not precise entries. Their value is partly self-fulfilling: so many traders and institutions watch the 50/200 relationship that it influences behaviour around those crosses.
How to use them
Three sound, common uses:
- Trend direction. Price above a rising average leans bullish; below a falling one leans bearish. This sets your bias before you look for an entry.
- Dynamic support and resistance. In a trend, price often pulls back to a moving average and bounces, giving an entry in the direction of the trend rather than against it.
- Crossovers. A faster average crossing a slower one flags a momentum shift, useful as confirmation alongside RSI or MACD.
All three play to the moving average's strength, reading and following trend, and all three need price confirmation and a defined risk rather than blind execution.
Common mistakes
The usual moving average errors:
- Trading crossovers in a range. In choppy markets, crossovers whipsaw endlessly. Moving averages are trend tools; they struggle sideways.
- Expecting them to predict. They lag by design. They confirm trends, they do not call tops and bottoms.
- Using too many. A chart buried in averages obscures more than it reveals. Two or three is plenty.
- Skipping risk control. The stop and position size protect the account, not the average.
Used with the trend and confirmed by price, moving averages are a reliable backbone for reading direction. Build the rest of the foundation with RSI, MACD and forex trading strategies, and choose a broker with full charting from the best forex brokers in Australia ranking.
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Diagram is illustrative. Last reviewed: 2026-06-01.
Frequently asked questions
What is a moving average in trading?
A moving average is a line that smooths price by averaging it over a set number of periods, recalculated as each new period closes so the line moves along with price. It strips out short-term noise to make the underlying trend clearer. For example, a 50-day moving average plots the average of the last 50 daily closes. Traders use it to judge trend direction, to act as dynamic support or resistance, and to generate crossover signals. It is one of the oldest and most widely used tools in technical analysis.
What is the difference between SMA and EMA?
Both smooth price, but they weight it differently. A simple moving average (SMA) gives every period in its window equal weight, so it is smoother and slower to react. An exponential moving average (EMA) gives more weight to recent prices, so it reacts faster to new moves and turns sooner, at the cost of more false signals. Short-term traders often prefer the EMA for its responsiveness; longer-term traders often prefer the SMA for its stability. Neither is better in the abstract; they suit different timeframes.
What is a golden cross and a death cross?
They are the best-known moving average crossover signals, usually using the 50-period and 200-period averages. A golden cross is when the faster 50-period average crosses above the slower 200-period average, traditionally seen as a bullish signal that a longer-term uptrend may be starting. A death cross is the reverse, the 50 crossing below the 200, seen as bearish. Both are lagging signals that confirm a trend already underway rather than predicting it, so they are best used as context, not precise entry triggers.
What moving average periods should I use?
The most common periods are 20, 50, 100 and 200. The 200-period average is the classic long-term trend gauge, the 50 is a medium-term trend filter, and the 20 tracks short-term momentum. Day traders often use shorter averages like 9 and 21, while position traders lean on the 50 and 200. There is no single correct setting; pick periods that match your timeframe and use them consistently. Watching how price interacts with a widely used average like the 200 matters because so many traders watch it too.
How do you trade with moving averages?
Three common approaches. First, trend direction: price above a rising average suggests an uptrend, below a falling one suggests a downtrend, which sets your bias. Second, dynamic support and resistance: in a trend, price often pulls back to a moving average and bounces, offering an entry in the direction of the trend. Third, crossovers: a faster average crossing a slower one signals a momentum shift. All three work best with the trend and confirmed by price, never as standalone triggers, and always with a stop loss.
Do moving averages work in forex?
Yes, moving averages are widely used in forex and CFD trading to read trend and dynamic support across timeframes. Because currency pairs trend cleanly through interest-rate and macro cycles, trend-following tools like moving averages tend to suit them well. The 50 and 200 are watched closely on the daily charts of major pairs. As in any market they lag price and produce false signals in choppy ranges, so they work best aligned with the trend and combined with other signals and disciplined risk management.
