IV Rank & Percentile Suite V1.0

What This Indicator Does

The IV Rank & Percentile Suite provides the volatility context options traders need to time entries. It calculates two complementary metrics—IV Rank and IV Percentile—using historical volatility as a proxy, then displays clear visual zones to identify favorable conditions for premium selling strategies.

Stop guessing if volatility is "high" or "low." This indicator tells you exactly where current volatility sits relative to recent history.

The Two Metrics Explained
IV Rank (0-100) Measures where current volatility sits within its 52-week high-low range.

IV Rank = (Current HV - 52w Low) / (52w High - 52w Low) × 100

• 70 means current volatility is 70% of the way between the yearly low and high
• Sensitive to extreme spikes (a single high reading affects the range)

IV Percentile (0-100) Measures what percentage of days in the lookback period had lower volatility than today.

IV Percentile = (Days with lower HV / Total days) × 100

• 70 means volatility was lower than today on 70% of days in the past year
• More stable, less affected by outlier spikes

Why Both?
IV Rank reacts faster to volatility changes. IV Percentile is more stable and statistically robust. When both agree (e.g., both above 50), you have stronger confirmation. Divergence between them can signal transitional periods.

Zone System
The indicator divides readings into three zones:
Zone ------- Default Range ---- Meaning ------------------ Premium Selling
🟢 High ≥ 50 Elevated volatility Favorable
🟡 Neutral 25-50 Normal volatility Selective
🔴 Low ≤ 25 Compressed volatility Avoid

An additional Extreme threshold (default 75) highlights prime conditions when volatility is significantly elevated.
Zone thresholds are fully customizable in settings.

How to Use It
For Premium Sellers (Iron Condors, Credit Spreads, Strangles)

1. Wait for IV Rank to enter the green zone (≥50)
2. Confirm IV Percentile agrees (also elevated)
3. Enter premium selling positions when both metrics align
4. Avoid initiating new positions when in the red zone

For Premium Buyers (Long Options, Debit Spreads)

1. Low IV Rank/Percentile means cheaper options
2. Red zone can favor directional debit strategies
3. Avoid buying premium when both metrics are in the green zone

General Principle:
Sell premium when volatility is high (it tends to revert to mean). Buy premium when volatility is low (if you have a directional thesis).

Inputs
Volatility Calculation

• HV Period — Lookback for historical volatility calculation (default: 20)
• Trading Days/Year — 252 for stocks, 365 for crypto

Lookback Periods

• IV Rank Lookback — Period for high/low range (default: 252 = 1 year)
• IV Percentile Lookback — Period for percentile calculation (default: 252)

Zone Thresholds

• High IV Zone — Readings above this are highlighted green (default: 50)
• Low IV Zone — Readings below this are highlighted red (default: 25)
• Extreme High — Threshold for "prime" conditions alert (default: 75)

Display Options

• Toggle IV Rank, IV Percentile, and raw HV display
• Show/hide zone backgrounds
• Show/hide info panel
• Panel position selection

Info Panel
The panel displays:
Field ------- Description
IV Rank ------- Current reading with color coding
IV Pctl ------- Current percentile with color coding
HV 20d ------- Raw historical volatility percentage
52w Range ------- Lowest to highest HV in lookback period
Zone ------- Current zone status
Premium ------- Signal quality for premium selling
Lookback ------- Days used for calculations
R/P Spread ------- Difference between Rank and Percentile

Alerts
Six alerts are available:
Zone Transitions

• IV Entered High Zone — Favorable for premium selling
• IV Reached Extreme Levels — Prime conditions
• IV Dropped to Low Zone — Caution for premium sellers

Threshold Crosses

• IV Rank Crossed Above High Threshold
• IV Rank Crossed Below Low Threshold
• IV Percentile Above 75
• IV Percentile Below 25

Set up alerts to get notified when conditions change without watching charts.

Technical Notes
Volatility Calculation Method
This indicator uses close-to-close historical volatility as an IV proxy:

1. Calculate log returns: ln(Close / Previous Close)
2. Take standard deviation over HV Period
3. Annualize: multiply by √(Trading Days)

This method correlates well with implied volatility for most liquid instruments. On highly liquid options underlyings (SPY, QQQ, major stocks), HV and IV tend to move together, making this a reliable proxy for IV Rank analysis.

Non-Repainting
All calculations use confirmed bar data. Values are fixed once a bar closes.

Lookback Requirement
The indicator needs sufficient history to calculate accurately. For a 252-day lookback, ensure your chart has at least 300+ bars of data.

Best Used On

• ETFs: SPY, QQQ, IWM, DIA
• Indices: SPX, NDX
• High-volume stocks: AAPL, TSLA, NVDA, AMD, META
• Timeframe: Daily (recommended), Weekly for longer-term view

The indicator works on any instrument but is most meaningful on underlyings with active options markets.

Important Notes
⚠️ This indicator uses historical volatility as a proxy for implied volatility. While HV and IV are correlated, they are not identical. For precise IV data, consult your options broker's platform.
⚠️ High IV Rank does not guarantee profitable premium selling. It indicates favorable conditions, not guaranteed outcomes. Position sizing and risk management remain essential.
⚠️ Past volatility patterns do not guarantee future behavior. Volatility regimes can shift, and historical ranges may not predict future ranges.

Suggested Workflow

1. Add to daily chart of your preferred underlying
2. Set up alert for "IV Entered High Zone"
3. When alerted, check both IV Rank and IV Percentile
4. If both elevated, evaluate premium selling opportunities
5. Use your broker's actual IV data for final entry decisions

Questions? Leave a comment below.