In short
- A moving average (MA) smooths prices so the direction of the trend is easier to see.
- It always lags the price. It is not a forecast, only an aid to form a view.
- In sideways markets it produces many false signals.
- A stop-loss and a predetermined position size matter more than the choice of period.
This page shows how it is used in practice. The explanation of calculation, types and theory is in the tutorial Moving averages trading strategy.
What problem does it help with?
Prices move up and down from minute to minute. That makes it hard to see whether a market is rising, falling or going sideways. A moving average takes the average price over a number of periods. This removes part of the noise and shows the main direction.
It does not tell you when the price will turn. The average only uses past prices, so it reacts late. A short period (for example 20) reacts faster but gives more false signals. A long period (for example 200) is calmer but later.
How traders use it in practice
Judging trend direction
Many traders check whether the price is above or below an average such as the 50-day or 200-day. Above a rising average they see an uptrend. Below a falling average they see a downtrend. If the average is flat and the price keeps crossing it, there is no clear trend and many traders skip the signal.
The average as dynamic support
In an uptrend the price sometimes pulls back to, for example, the 20-day or 50-day average. Some traders look for an entry there, provided the price actually bounces. There is no guarantee that it does. Sometimes the price drops straight through, which is often a sign that the trend is weakening.
Crossovers of two averages
In a crossover, a fast average (for example 50) crosses a slow average (for example 200). Upward is called a “golden cross”, downward a “death cross”. Because both averages lag, the signal often arrives after a large part of the move. In sideways markets crossovers alternate quickly, which leads to a series of small losses.
Worked example (hypothetical)
This example is made up and only shows the calculation steps.
- A share trades at €100, above a rising 50-day average of €96.
- The price pulls back to €98.50 and turns. A trader enters at €98.50.
- The stop-loss is at €96.50, below the average and the last low. The risk is €2 per share.
- Account: €10,000. Maximum loss per trade: 1% = €100.
- Position size: €100 / €2 = 50 shares (about €4,925 invested).
- Target: €102.50 (€4 profit per share). The ratio of reward to risk is then 2 to 1.
If the price falls to the stop-loss, you lose about €100 plus costs. If it reaches the target, you gain about €200 minus costs. This says nothing about how often either happens. Across several trades a run of losses can simply occur.
Checklist before a trade
- Which timeframe and which average am I using, and why?
- Is the average clearly rising or falling, or is it flat?
- Are there nearby levels (support, resistance) that contradict my idea?
- Where is my stop-loss, and does the risk fit my limit per trade?
- How large is the position, calculated from the stop distance?
- What are the costs (spread, commission) compared with my expected gain?
- Is news or a report scheduled that could make the price jump?
Common mistakes
- Following every crossover. In sideways markets this leads to many small losses.
- Adjusting periods until the past fits. A setting that looks perfect in hindsight rarely works going forward.
- Treating the average as a prediction. It describes what has already happened.
- Too many averages at once. Four lines on the chart give false certainty and conflicting signals.
- No stop-loss because “the trend will continue anyway”. Trends can reverse suddenly.
Risk management
Decide in advance how much you are willing to lose per trade, for example 1% of your account. Place the stop-loss at a logical level and then calculate the position size. Useful tools:
Keep in mind that in high volatility the price can jump past a stop-loss. Your loss can then be larger than planned.
Costs
Every trade costs money. When trading short term, costs add up quickly. The spread is the difference between the buy and sell price. Suppose it is €0.10 per share: for 50 shares that is about €5 for entry and exit together, before any commission. A strategy with small profit targets can therefore earn much less than the chart suggests. Compare provider costs on Compare brokers.
Summary
Moving averages help you judge the direction of a market and structure an entry or exit. They lag, give false signals in sideways markets and work differently per market and timeframe. Use them together with a fixed stop-loss, a calculated position size and attention to costs. Read the full theory in the tutorial Moving averages trading strategy.
This is educational information, not investment advice. Trading involves risk and you can lose all or part of your capital.