Impulse Wave
The Foundation of Elliott Wave Theory · Rules, Extensions, Fibonacci & Applications in Analysis
An Elliott Wave impulse is a 5-wave motive structure that moves in the direction of the larger trend. It consists of three motive waves (1, 3, 5) separated by two corrective waves (2, 4), forming the classic 5-3-5-3-5 sub-wave structure totalling 21 sub-waves. Mastering impulse identification and Fibonacci relationships is the cornerstone of accurate Elliott Wave analysis.
What is an Elliott Wave Impulse?
An impulse wave is a 5-wave motive structure that moves in the direction of the larger trend. It consists of three motive waves (1, 3, 5) separated by two corrective waves (2, 4), forming the classic 5-3-5-3-5 sub-wave structure totalling 21 sub-waves. Mastering Elliott Wave impulse identification and Fibonacci relationships is the cornerstone of accurate analysis. For a wider overview of the theory, see the Elliott wave principle on Wikipedia.
Impulse Structure: Wave-by-Wave Breakdown
| Wave | Structure | Direction | Characteristic |
|---|---|---|---|
| Wave 1 | 5-wave impulse (or leading diagonal) | With trend | Often unrecognised, looks like a counter-trend bounce |
| Wave 2 | 3-wave corrective (any type) | Against trend | Deep retrace of Wave 1, often 61.8 to 78.6% |
| Wave 3 | 5-wave impulse | With trend | Usually the longest and strongest, never the shortest |
| Wave 4 | 3-wave corrective (any type) | Against trend | Shallower than Wave 2, typically 23.6 to 38.2% of Wave 3 |
| Wave 5 | 5-wave impulse (or ending diagonal) | With trend | Final push, often accompanied by momentum divergence |
The Three Unbreakable Rules
Rule 1: Wave 2 Cannot Retrace Past Wave 1 Origin
✓ Wave 2 can retrace up to 99.9% of Wave 1
✗ Wave 2 CANNOT close beyond the start of Wave 1
✗ If it does, the entire wave count is invalid, reassess from scratch
Rule 2: Wave 3 Cannot Be the Shortest Motive Wave
✓ Wave 3 can be shorter than Wave 5 but NEVER shorter than both Wave 1 AND Wave 5
✗ Wave 3 CANNOT be the shortest of Waves 1, 3, and 5
✗ If it is, the count is invalid, recount
Rule 3: Wave 4 Cannot Overlap Wave 1 Territory
✓ Wave 4 must end above Wave 1 high (in a bull impulse)
✗ Wave 4 CANNOT close below Wave 1 peak
⚠ Exception: Leading and Ending Diagonals, overlap IS allowed in diagonals only
Key Guidelines
Alternation (75% frequency)
Wave 2 and Wave 4 tend to alternate in form:
Wave 2 sharp zigzag → Wave 4 flat or triangle
Wave 2 flat → Wave 4 zigzag or triangle
Wave 3 Extension (~60% of impulses)
161.8% of Wave 1 → Primary target
200% of Wave 1 → Strong extension
261.8% of Wave 1 → Extreme / parabolic move
Wave 5 Extension (~30% of impulses)
When Wave 3 extends, Wave 5 ≈ Wave 1:
100% of Wave 1 → Primary target
161.8% → Extended Wave 5 (watch for ending diagonal)
Wave 1 Extension (~10% of impulses)
Rarest type, often at major reversals.
When Wave 1 extends: Wave 3 ≈ Wave 5
Wave 1 = 161.8 to 261.8% of prior correction
Fibonacci Relationships
Wave 2 Retracement of Wave 1
| Fib Level | Depth | Frequency | Notes |
|---|---|---|---|
| 38.2% | Shallow | 10% | Rare, signals very strong Wave 1 |
| 50% | Standard | 20% | Common in fast-moving markets |
| 61.8% | MOST COMMON | 45% | Golden ratio, primary Wave 2 target |
| 78.6% | Deep | 20% | Common in large-degree Wave 2 |
| 88.6% | Very deep | 5% | Near Wave 1 origin, extreme but valid |
Wave 3 Extension of Wave 1
| Fib Ratio | Wave 3 Size | Frequency | Analysis Implication |
|---|---|---|---|
| 123.6% of Wave 1 | Mild extension | 15% | Modest trend strength |
| 161.8% of Wave 1 | MOST COMMON | 50% | Primary Wave 3 target |
| 200% of Wave 1 | Strong extension | 15% | Strong trend, 161.8% is the first target |
| 261.8% of Wave 1 | Extreme extension | 10% | Parabolic move, rare |
Wave 4 Retracement of Wave 3
| Fib Level | Depth | Frequency | Notes |
|---|---|---|---|
| 23.6% | MOST COMMON | 35% | Shallow, Wave 3 was very extended |
| 38.2% | Standard | 40% | Most balanced Wave 4 retrace |
| 50% | Deep | 20% | Often a flat or triangle at this level |
| 61.8% | Very deep | 5% | Near Wave 1 high, maximum valid depth |
Wave 5 Target
| Fib Ratio | Wave 5 Size | Frequency | Notes |
|---|---|---|---|
| 61.8% of Wave 1 | Truncated | 15% | Weak momentum, divergence expected |
| 100% of Wave 1 | EQUAL, MOST COMMON | 50% | Primary target when Wave 3 extended |
| 123.6% of Wave 1 | Extended | 20% | Strong 5th wave momentum |
| 161.8% of Wave 1 | Fifth wave ext. | 15% | Look for ending diagonal or exhaustion signals |
Applying Impulse Waves in Analysis
Outline 1: Wave 2 Completion (the Clearest Read)
After Wave 1 completes, wait for Wave 2 to retrace to 61.8% of Wave 1. This is the clearest point to project the powerful Wave 3 move.
| Wave 2 zone | 61.8% retrace of Wave 1 (Wave 2 completion zone) |
| Target 1 | Wave 1 high (100% of Wave 1 from origin) |
| Target 2 | 161.8% extension of Wave 1 from Wave 2 low (Wave 3 target) |
| Invalidation | Count invalid below the Wave 1 origin |
Outline 2: Wave 4 Completion
After Wave 3 extends to 161.8%, watch for Wave 4 to retrace 23.6% to 38.2% before projecting the final Wave 5 push.
| Wave 4 zone | 38.2% retrace of Wave 3 (Wave 4 completion zone) |
| Confirmation | Wave 4 holds above Wave 1 high (no overlap) |
| Target | Wave 3 high + 100% of Wave 1 (Wave 5 = Wave 1) |
| Invalidation | Count invalid below the Wave 1 high (overlap) |
Outline 3: Wave 5 Exhaustion
When Wave 5 reaches 100% of Wave 1 with RSI/MACD divergence, the count would favour a significant corrective reversal.
| Signal | Wave 5 at 100% of Wave 1 + bearish momentum divergence |
| Confirmation | First 3-wave retrace after the Wave 5 peak |
| Target | 38.2 to 61.8% retracement of entire 5-wave impulse |
| Invalidation | Count invalid above the Wave 5 high |
Impulse Wave Identification Checklist
- Does the structure have exactly 5 waves in the direction of the trend?
- Does Wave 2 retrace less than 100% of Wave 1?
- Is Wave 3 NOT the shortest motive wave?
- Does Wave 4 avoid overlapping Wave 1 price territory?
- Does each motive wave (1, 3, 5) subdivide into 5 smaller waves?
- Does each corrective wave (2, 4) subdivide into 3 smaller waves?
- Does Wave 3 reach at least 123.6% of Wave 1?
- Is there alternation between Wave 2 and Wave 4 structures?
- After Wave 5, is there a significant corrective reversal confirming completion?
Common Impulse Mistakes to Avoid
✗ Mistake 1: Allowing Wave 2 to retrace past Wave 1 origin.
✓ Fix: If Wave 2 closes below Wave 1 start, the count is invalid. Start over.
✗ Mistake 2: Labelling Wave 3 as the shortest motive wave.
✓ Fix: Wave 3 must be longer than at least one of Wave 1 or Wave 5. Recount if it is the shortest.
✗ Mistake 3: Ignoring Wave 4 / Wave 1 overlap.
✓ Fix: If Wave 4 closes below Wave 1 high (bull market), it is either a diagonal or an invalid count.
✗ Mistake 4: Expecting Wave 5 to always extend.
✓ Fix: In most impulses Wave 3 extends. Wave 5 often equals Wave 1, so do not assume an extension not confirmed by momentum.
✗ Mistake 5: Counting a 3-wave move as an impulse.
✓ Fix: If you can only count 3 waves, it is corrective. Wait for a confirmed 5-wave structure with proper sub-division.
Real Example: XAUUSD Impulse Wave (Wave 3 Extension)
Gold begins a major Wave 3 impulse from the Wave 2 low at 2,000.
| Wave | Structure | Price Level | Fib Notes |
|---|---|---|---|
| Wave 1 | 5-wave impulse | 2,000 → 2,480 (480 pts) | Initiates the move |
| Wave 2 | Zigzag retrace | 2,480 → 2,183 (297 pts) | 61.9% of Wave 1 ✓ |
| Wave 3 | 5-wave impulse | 2,183 → 2,959 (776 pts) | 161.7% of Wave 1 ✓ |
| Wave 4 | Flat correction | 2,959 → 2,773 (186 pts) | 24.0% of Wave 3 ✓ |
| Wave 5 | 5-wave impulse | 2,773 → 3,245 (472 pts) | 98.3% of Wave 1 ✓ |
Analysis Outline: Wave 2 Completion for Wave 3
1. Wave 2 complete at 2,183 (61.8% retrace of Wave 1), with Wave 3 favoured higher
2. Target 1: 2,480 (Wave 1 high retest)
3. Target 2: 2,183 + 776 = 2,959 (161.8% extension = Wave 3 target)
4. Count invalid below 2,000 (the Wave 1 origin)
Quick Reference: Impulse Wave Essentials
- Structure: 5 waves, motive (1, 3, 5) + corrective (2, 4) = 5-3-5-3-5 sub-waves (21 total)
- Rule 1: Wave 2 CANNOT retrace past Wave 1 origin
- Rule 2: Wave 3 CANNOT be the shortest motive wave
- Rule 3: Wave 4 CANNOT overlap Wave 1 price territory (except diagonals)
- Best Fib: W2 = 61.8% of W1 | W3 = 161.8% of W1 | W4 = 38.2% of W3 | W5 = 100% of W1
- Alternation: Wave 2 and Wave 4 alternate in structure, sharp vs. sideways (75% frequency)
- Extension: Only ONE wave extends, Wave 3 in approximately 60% of cases