Diagonals in 30 Seconds
Four ideas. Everything else on this page builds on them.
The Shortcut: Start or Finish
Both types look similar on a chart. What separates them is where they appear in the larger wave structure.
This is the one thing worth memorising first.
Wave 1 and Wave A both sit at the start of a structure. Wave 5 and Wave C both sit at the end. That is the entire logic behind which positions are allowed.
What a Diagonal Actually Is
A diagonal is a motive wave. It moves in the direction of the larger trend.
Like a normal impulse, it is built from five waves, labeled (1) to (5).
The difference is the shape. Draw one line through waves (1), (3) and (5). Draw a second line through waves (2) and (4).
In a normal impulse those two lines run roughly parallel. In a diagonal they converge — the channel narrows into a wedge.
That narrowing brings one important consequence, and it is the subject of the next section.
Normal Impulse vs. Diagonal
Both structures below have five waves. Step through the diagram and watch what happens to Wave 4.
Why the Overlap Matters
In a standard impulse, Wave 4 entering Wave 1's price territory normally invalidates the count. The structure has to be re-labeled. Structural rule
In a diagonal, the same overlap is not a violation. It is one of the characteristics that helps identify the pattern in the first place. Structural rule
So the overlap is not a warning sign here. It is evidence.
“Overlap is expected” does not mean the overlap must be deep or dramatic. It is often modest — Wave 4 simply dips into the price range Wave 1 already covered. A small overlap counts.
The Leading Diagonal
Where it appears: Wave 1 of an impulse, or Wave A of a zigzag. Structural rule
What that means: a larger move may just be starting.
Step through the diagram below. Each step answers a single question.
A Leading Diagonal is often followed by a sharp, deep Wave 2 pullback. Treat that as a tendency worth preparing for, not an outcome you can count on. Typical behaviour
What 5-3-5-3-5 Actually Means
Elliott Wave notation like 5-3-5-3-5 looks cryptic until you know what it counts.
The numbers describe how many smaller waves sit inside each of the diagonal's five main waves.
Read them left to right: the first number belongs to Wave (1), the second to Wave (2), and so on.
In short: an Ending Diagonal is uniform — every leg is a three. A Leading Diagonal alternates — five, three, five, three, five.
Advanced note — different Elliott Wave conventions
The 5-3-5-3-5 count for a Leading Diagonal is the classic Elliott/Prechter convention, and it is the one this guide follows throughout.
Some later Elliott Wave literature — for example Neely's NEoWave — also accepts a 3-3-3-3-3 subdivision in the Leading Diagonal position.
For a beginner this debate changes nothing practical: the position, the wedge shape and the Wave 4 / Wave 1 overlap identify the pattern either way. Learn the Prechter count first, and treat the alternative as context you will meet later.
The Ending Diagonal
Where it appears: Wave 5 of an impulse, or Wave C of a correction. Structural rule
What that means: the larger move may be running out of energy.
The diagram follows the same order as the Leading Diagonal, so the two can be compared directly.
Secondary Clues
Three things often accompany an Ending Diagonal. None of them is a structural requirement.
- Fading volume. Volume commonly declines as the pattern progresses. Typical behaviour
- Throw-over. Price may briefly break past the wedge boundary before reversing. Common, but not mandatory. Optional clue
- Trend exhaustion. An Ending Diagonal often signals the larger trend is tiring. A dramatic reversal does not follow every time. Typical behaviour
Use these to support a count you already built from structure. They cannot replace it.
Leading vs. Ending, Side by Side
Everything the two types share, and everything that separates them, in one view.
Position First, Shape Last
Shape alone does not tell you which diagonal you are looking at. Both types are usually drawn as a contracting wedge.
Work through the evidence in this order.
In practice: Wave 1/A + matching subdivision gives you a Leading candidate. Wave 5/C + matching subdivision gives you an Ending candidate.
Advanced note — expanding variants
Contracting wedges are the common form for both types, and every diagram on this page shows one.
Expanding variants exist too, where the boundary lines diverge instead of converging. They are less common and easier to misread.
The identification logic does not change: position first, subdivision second. An expanding shape does not by itself rule a diagonal in or out.
Do I Have a Diagonal?
A working sequence for an actual chart. Answer them in order.
Common Beginner Mistakes
Rules, Tendencies and Clues
Not every statement on this page carries the same weight. This is which is which.
| Characteristic | Weight |
|---|---|
| A diagonal has five main waves | Structural rule |
| Wave 4 may overlap Wave 1 | Structural rule |
| Leading Diagonals normally appear in Wave 1 or Wave A | Structural rule |
| Ending Diagonals normally appear in Wave 5 or Wave C | Structural rule |
| Ending Diagonals subdivide 3-3-3-3-3 | Structural rule |
| Leading Diagonals subdivide 5-3-5-3-5 in the convention used here | Structural rule |
| The wedge contracts rather than expands | Typical behaviour |
| An Ending Diagonal signals trend exhaustion | Typical behaviour |
| A deep Wave 2 follows a Leading Diagonal | Typical behaviour |
| Volume declines through an Ending Diagonal | Optional clue |
| A throw-over appears before the reversal | Optional clue |
Technical Summary
Positions 2, 3, 4 and B require a standard structure. Diagonal-like sub-structures inside a complex B wave are occasionally debated, but they are not the pattern this guide covers.
How This Connects to TVT's Framework
Once you can recognise a diagonal, it changes how the surrounding wave count should be read.
These are structural expectations, not guaranteed market outcomes. A diagonal raises the plausibility of what follows — it does not determine it.
See the Elliott Wave Beginner Guide for the standard impulse rules this pattern is the exception to, the Trimming & Re-Entry Guide for Wave 3/4/5 handling, and the ABC Pullback Guide for what typically follows an Ending Diagonal in Wave 5.