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What Is a Moving Average in Trading?

The Big Idea

A moving average is a line drawn on your chart that shows the average price over a certain number of recent bars. It’s called “moving” because as new prices come in, the average updates and the line slides along with the chart.

Think about your grades in school. Some days you ace a test, some days you bomb one. Your individual grades jump around a lot. But your OVERALL average smooths all that out and tells you the real story of how you’re doing. If your running average is going up, you’re improving. If it’s going down, you’re slipping.

Moving averages do the same thing for prices. They filter out the daily noise and show you the real direction. Is the price trending up, down, or sideways? A moving average makes it obvious.

How Moving Averages Work

The math is simple. If you want a 10-day moving average, you:

  1. Take the last 10 closing prices
  2. Add them together
  3. Divide by 10

That’s your average. Tomorrow, you drop the oldest day and add the newest day, then calculate again. The average “moves” forward with the price.

Luckily, you don’t have to do this by hand. Every chart platform calculates moving averages automatically. You just add them to your chart with a click.

The NUMBER you choose matters. A 5-day moving average reacts fast to new prices. A 200-day moving average reacts slowly because it has so much data behind it. Shorter = more sensitive. Longer = more stable.

The Most Popular Moving Averages

There are infinite possible moving averages. But traders mostly use a few specific ones.

20-Day (or 20-Period)

Shows the short-term trend. Reacts relatively quickly to price changes. Good for seeing what the market has been doing over the past month or so. Day traders often use much shorter versions, like the 20-minute moving average on intraday charts.

50-Day

Shows the medium-term trend. Widely watched by traders and portfolio managers. Often acts as support in uptrends and resistance in downtrends. A lot of mid-term momentum traders buy when price holds the 50-day.

100-Day

Less common but still used. Sits between the 50 and 200, offering a middle-ground view of the trend.

200-Day

The big one. Shows the long-term trend. THE most watched moving average by institutional traders. If price is above the 200-day, many consider the market “bullish.” If below, “bearish.” Breaking the 200-day is often a big deal.

Very Short Ones (5, 10)

For quick trading. Very sensitive to price. Can give early signals but also more false signals. Used mostly by day traders and scalpers.

A Simple Example

Let’s meet Alex. He pulls up a chart of his favorite stock. He adds the 50-day moving average.

He sees:

Alex’s brain puts it together. This stock is in an uptrend, and the 50-day is acting as support. He now has a plan. If the price pulls back to the 50-day moving average again, he’ll look for buy signals. If price breaks BELOW the 50-day, he’ll be cautious.

One simple line gave him:

That’s the power of a moving average. One line, multiple useful insights.

Simple vs Exponential Moving Averages

You’ll see two main types in your charting software: Simple (SMA) and Exponential (EMA).

Simple Moving Average (SMA)

All prices in the calculation get equal weight. The most recent day matters just as much as the day from 20 days ago. Smooth and stable.

Exponential Moving Average (EMA)

More weight given to recent prices. Reacts faster to new data. A bit bumpier but picks up changes sooner.

Which to Use?

It’s mostly personal preference. SMAs are more traditional and widely watched. EMAs react faster. Many traders use EMAs for short timeframes and SMAs for longer ones.

Honestly, for beginners, the difference doesn’t matter much. Pick one type and stick with it. Don’t waste time over-optimizing.

How to Use Moving Averages in Trading

Use 1: Trend Direction

The simplest and most powerful use. Is the moving average sloping up? Uptrend. Sloping down? Downtrend. Flat? Sideways. Just looking at the slope of a 50-day or 200-day moving average tells you a lot.

Use 2: Support and Resistance

In uptrends, moving averages often act as dynamic support. Price pulls back, touches the moving average, and bounces. In downtrends, moving averages act as resistance. Rallies fail at the moving average.

This is one of the best ways to use moving averages. Wait for price to pull back to a key moving average during a trend, then look for entry signals.

Use 3: Crossovers

When a shorter moving average crosses above a longer one = bullish signal. When it crosses below = bearish signal.

The most famous: the “golden cross” (50-day crosses above 200-day) and the “death cross” (50-day crosses below 200-day). These get media coverage and often move markets, simply because lots of people watch them.

Crossovers are slow signals. They’re late by design. But they do a decent job of keeping you on the right side of major trends.

Use 4: Trade Filters

Some traders only take long trades when price is above the 200-day (bullish environment) and only take short trades when below (bearish environment). Using moving averages this way keeps you out of trades against the broader market.

Use 5: Stop Loss Placement

If you’re trading a pullback to the 50-day moving average, you might set your stop just below it. If the moving average breaks, your trade is wrong. Time to exit.

When Moving Averages Work (and When They Don’t)

Moving averages are great tools, but they’re not magic. They work well in some markets and poorly in others.

Works Well In:

Works Poorly In:

Moving averages LAG by nature. They show you what already happened, not what’s about to happen. That’s both their strength (they smooth noise) and their weakness (they’re late to turning points).

Know this going in. Use them as part of your toolkit, not as a crystal ball.

Using Multiple Moving Averages Together

Some traders use 2 or 3 moving averages on the same chart. This can tell a richer story.

Example 1: 20 + 50

Price above 20 above 50 = strong bullish stack. Everything trending up together.

Price below 20 below 50 = strong bearish stack.

Moving averages flipping between = choppy, no clear trend.

Example 2: 50 + 200

Used for broader trend context. Price above 50 above 200 = confirmed uptrend. Both moving averages sloping up = even stronger.

Example 3: 10 + 20 + 50

Used by shorter-term trend followers. Easy to see when the stacking breaks and a potential reversal is forming.

Don’t go overboard. More than 3 moving averages usually just clutters your chart. Pick a combo that fits your style and stick with it.

Common Mistakes Beginners Make

Mistake 1: Using Too Many

New traders pile on 5, 7, or even 10 moving averages. The chart becomes a rainbow spaghetti mess. Pick 1-3 and master them.

Mistake 2: Trusting Crossovers Blindly

Crossovers lag. In choppy markets, they generate lots of false signals. Use them with other tools, not alone.

Mistake 3: Buying Just Because Price Touches a Moving Average

The moving average alone isn’t a signal. A pullback to the 50-day might bounce or might break. Wait for additional confirmation (a bullish candle, a volume spike, etc.) before acting.

Mistake 4: Using the Same Moving Averages on All Timeframes

The 50-day moving average is for daily charts. On a 5-minute chart, a 50-period moving average is very different. Match your moving averages to your timeframe.

Mistake 5: Fighting a Strong Moving Average

If price is way above a rising 200-day moving average, don’t go hunting for shorts. You’re fighting the tape. Let the moving average guide which direction you favor.

Mistake 6: Ignoring the Price

Moving averages are DERIVED from price. Price is the real thing. Don’t get so wrapped up in watching moving averages that you forget to watch what the price itself is doing.

The Golden Cross and Death Cross

These deserve their own mention because the financial media loves them.

Golden Cross

When the 50-day moving average crosses ABOVE the 200-day moving average. Considered a long-term bullish signal. Often happens after a strong rally has been underway for months.

Death Cross

When the 50-day crosses BELOW the 200-day. Long-term bearish signal. Often happens after an extended decline.

Do they work? Sometimes. They’re lagging indicators, so they usually fire after the move is well underway. They’re more useful as confirmation of an existing trend than as early warning signals.

Still, because so many traders and algorithms watch these crosses, they can create real buying or selling pressure on their own. Watching for them is worthwhile, but don’t treat them like gospel.

The Big Picture

Moving averages are one of the most widely used tools in all of trading. They’re simple to understand, easy to apply, and genuinely useful for seeing the forest through the trees.

Here’s what to remember:

You don’t need fancy indicators to find trends. A 50-day and 200-day moving average on a daily chart tell you most of what you need to know about whether a market is healthy or unhealthy.

Start simple. Add a 50-day and 200-day to your charts. Just look. See how price interacts with them. Notice the bounces, the rejections, the breakdowns. Over time, your eye will develop, and you’ll understand why professional traders keep coming back to these simple lines year after year.

Moving averages won’t win you every trade. Nothing does. But they’ll keep you on the right side of the big picture, which is more than half the battle.

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Focus on the process. Trust the stats. Stay consistent.