How to read a price chart

A price chart is a picture of every transaction that has already happened. It is a record, not a forecast, and learning to read one is mostly about learning what it is actually showing you rather than what you hope it might.

Charts intimidate new investors because they arrive covered in colour and jargon. Underneath, a chart answers three simple questions. What did this security trade at, when, and how much of it changed hands. Everything else is built on those three facts.

This guide covers the basics properly: what the axes mean, why the timeframe you choose changes the story, the three main chart types, how to read a single candlestick, what volume adds, and where charts stop being useful. It assumes no prior knowledge.

What a chart is, and is not

Every point on a price chart exists because a buyer and a seller agreed on a price and a trade occurred. The chart is the accumulated record of those agreements over time. That is the whole of it.

This matters because it sets the limits of what a chart can tell you. It shows you what the market has collectively decided so far. It carries no information about what a company earns, whether it carries too much debt, or whether the price is sensible relative to the business. Those questions require different tools.

What a chart is genuinely good for is context. Whether a price is near the top or bottom of its recent range, whether it has been moving steadily or erratically, whether a recent move was unusual by its own standards, and where levels sit that the market has reacted to before.

A chart is a record of agreements that have already happened. Its value is context, not prophecy.

Price, time and the axes

Two axes, and they are worth stating plainly because misreading them is the most common beginner error.

The horizontal axis is time, running left to right. The oldest data is on the left, the most recent on the right. The vertical axis is price, low at the bottom and high at the top.

The subtlety is in the price axis, because it can be drawn two ways. A linear scale gives equal space to equal dollar moves, so a rise from ten dollars to twenty occupies the same vertical distance as one from one hundred to one hundred and ten. A logarithmic scale gives equal space to equal percentage moves, so a doubling always looks the same size wherever it happens.

For a chart covering a few months the difference is barely visible. Over ten years it is dramatic. A linear chart of a stock that has risen many times over will compress its early history into an almost flat line and make the recent period look explosive, which is a visual artefact rather than a fact about the business. If you are looking at a long history, use a log scale.

Timeframes change the story

Each point on a chart summarises a period. On a daily chart each point is one trading day. On a weekly chart, one week. Change that setting and the same security can appear to be doing opposite things.

A stock in a multi-year advance will have countless days and weeks where it fell. Look at a five-day chart during one of those and you will see a decline. Nothing is wrong with either chart. They are answering different questions.

So the timeframe should match your own horizon. If your decisions play out over months, a daily or weekly chart is the relevant one, and intraday movement is noise you have no reason to watch. Traders who switch timeframes looking for one that agrees with a position they already hold are not analysing, they are shopping for reassurance.

Line, bar and candle

Three ways to draw the same data, carrying increasing amounts of information.

• Line chart. Joins the closing price of each period. Clean, easy to read at a glance, and discards everything that happened inside the period.
• Bar chart. A vertical line spanning the high and low of the period, with small ticks marking the open on the left and the close on the right. All four prices, compactly.
• Candlestick chart. The same four prices drawn as a filled body with lines above and below. Easier to read quickly than a bar, which is why almost everyone uses them.

Line charts are useful when comparing several securities at once, because four-price detail on five overlaid lines is unreadable. For looking at one security properly, candles are the standard.

The anatomy of a candlestick

One candle shows four prices for its period, and once you can read one you can read any chart.

The wicks are the part beginners skip, and they carry the most interesting information. A candle with a long lower wick and a small body near the top says price fell heavily during the period and buyers pushed it back up before the close. That is a different story from a candle with no lower wick at all, even if both closed at the same price.

What the colour actually tells you

Colour indicates one thing only: whether the close was above or below the open of that same period. Green, or unfilled, means it closed higher than it opened. Red, or filled, means it closed lower.

Colour does not tell you whether the price is up or down compared with yesterday. A stock can gap sharply lower at the open, recover a little through the day, and print a green candle while sitting well below the previous close. Someone reading colour alone would conclude it was a good day.

So read the body against the previous candle, not the colour in isolation. Position on the chart is the signal. Colour is a convenience.

Reading a run of candles

Individual candles matter far less than sequences. The chart below is illustrative, not a real security.

Three things are worth noticing in that sequence, and none of them require pattern names.

• Bodies shorten as the advance matures. Each successive rise covers less ground, which suggests the buying that drove it is being met with more selling.
• Candle four has wicks on both sides and almost no body. Price moved in both directions and finished roughly where it started. That is disagreement, and disagreement often precedes a change of direction.
• The decline has long bodies. When price moves decisively in the new direction, the market has resolved its disagreement.

This is the honest version of chart reading. Not naming shapes, but asking who was in control during each period and whether that is changing.

Volume, the second dimension

Volume is the number of shares that changed hands during the period, drawn as bars beneath the price. It measures participation, and participation is how you gauge whether a price move meant anything.

Two practical readings:

• A move on heavy volume carries more weight, because more participants agreed with it. A big rise on very light volume tells you a small number of trades moved the price.
• Rising price on falling volume is worth noting. The advance is continuing, but with progressively less support behind it.

Volume is also where announcements become visible. An enormous volume bar almost always means news, and if you cannot see why a security suddenly traded five times its usual amount, find out before acting.

What the colour actually tells you

A gap is a space on the chart where no trading happened, created when a security opens at a materially different price from its previous close. On the ASX the gap between the close and the next open is the usual place, because overnight announcements and offshore markets both land while trading is shut.

Gaps matter for a practical reason rather than a theoretical one. If you have an exit level set and the price gaps straight through it, your exit happens at the opening price, not the level you nominated. A chart full of frequent gaps is telling you that this security is prone to exactly that.

A few patterns worth knowing

Candlestick patterns are named shapes that recur. There are dozens catalogued, most of them not worth memorising, and the honest position is that a pattern is a description of what just happened rather than a mechanism that causes what happens next.

Four are worth recognising, because each describes something real about the balance between buyers and sellers.

• Long body, almost no wicks. One side controlled the period from open to close. The most straightforward reading on any chart.
• Small body with long wicks both sides. Price moved substantially in both directions and resolved nothing. Often called a doji. It marks indecision, and indecision is most interesting after a sustained run in one direction.
• Long lower wick, small body near the top. Sellers pushed price down hard and buyers took it back before the close. After a decline, this says the selling met genuine demand.
• A body that fully spans the previous candle’s body, in the opposite direction. Commonly called engulfing. The new period reversed everything the prior one did, which is a clearer change of control than a single small candle.

Two caveats matter more than the list. Patterns fail frequently, and a pattern on low volume is considerably weaker than the same pattern on heavy volume. Reading whether bodies are lengthening or shortening across several periods will serve you better than knowing forty pattern names.

Support and resistance

Some price levels attract reactions repeatedly. A level where declines have tended to stop is usually called support, and one where advances have tended to stall is called resistance.

The reason these levels exist is behavioural rather than mechanical. If a stock fell to eight dollars twice and rebounded both times, a number of participants now regard eight dollars as cheap and place orders there, which makes a third rebound somewhat more likely. Equally, people who bought at twelve and watched it fall often sell when it returns to twelve, which creates resistance.

Three things to hold in mind. Levels are zones, not precise prices, so treating a single cent as significant is false precision. They break, frequently, and a level that has held three times is not stronger for it. And because everyone can see the same obvious level, protective orders cluster just beyond it, which is why price sometimes pushes briefly through before reversing.

The practical use is not prediction. It is that support and resistance give you sensible places to consider an exit, because a level breaking is a reasonably objective signal that the reasoning has changed.

Moving averages

A moving average plots the average closing price over a set number of periods, recalculated each period. A fifty-day moving average shows the average close of the last fifty days, drawn as a line through the candles.

Its only purpose is smoothing. Daily price data is noisy, and an average strips out enough of that noise to make the underlying direction visible. Two consequences follow, and both are regularly forgotten.

• It lags, by design. An average of the last fifty days cannot respond quickly to something that happened yesterday. It tells you where price has been, slightly late, and that is the trade you accept for a cleaner line.
• The period changes its character completely. A twenty-day average tracks price closely and turns often. A two-hundred-day average is slow and mostly ignores short moves. Neither is correct; they answer different questions.

The common uses are reading the slope, which gives you a rough direction with the daily noise removed, and watching whether price sits above or below the line as a crude gauge of whether the recent trend is intact.

What to be sceptical about is the crossover, where a shorter average crosses a longer one and this is treated as a signal in itself. Because both are lagging, a crossover confirms a move that has already happened. It can be useful as confirmation. Treated as a trigger, it will regularly have you acting late.

What a chart cannot tell you

Worth being blunt about, because charts invite overconfidence.

• What the business is worth. Nothing in the price history speaks to earnings, debt or whether the valuation is reasonable.
• Why anything happened. A chart shows a fall. It cannot say whether that was a profit downgrade, a sector rotation, or one large holder selling.
• What happens next. Patterns describe the past. They are not mechanisms, and they fail regularly.
• Anything about your circumstances. Tax, concentration, whether you need the capital next year.

Used well, a chart tells you where a price sits in its own recent history and how much conviction has been behind its moves. That is genuinely useful, and it is a smaller claim than most chart commentary implies.

A ten minute chart routine

1. Set a sensible timeframe first. Daily or weekly for most investors. Decide before you look, not after.
2. Zoom out before zooming in. Look at a year or more, then narrow. Where a price sits in its longer range is the single most useful thing a chart shows.
3. Read the recent bodies. Long or short, and in which direction. Are moves getting more or less decisive.
4. Check the wicks. Repeated long wicks in one direction mean price keeps being pushed there and rejected.
5. Glance at volume. Did the recent move have participation behind it, and are there any unexplained spikes.
6. Note any gaps. Frequent gapping is a risk characteristic worth knowing before you set an exit.

Six steps, and none of them require memorising pattern names. Doing this consistently on every security you look at will tell you more than any single indicator, because it builds the habit of asking what the price action actually shows rather than what you want it to.