Gann Angle Calculator – Simple Gann Angle & Gann Fan Angle Method

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Enter Market Data

Select your calculation method, then fill in the required fields.

High Price * Session high

Low Price * Session low

Current / Opening Price * LTP or today’s open

Daily Volatility (%) * 10-day historical volatility

Decimal Places Output rounding

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Gann Angle Results

Sample output shown below — enter your values and click Calculate.

📌 Trader’s Sticky Notes

💡 Key Tips

Enter price data 15–30 min after market open to avoid gap noise.
The 1×1 (45°) angle is Gann’s master line — price above it = bullish; below = bearish.
For Simple Gann Angle, only Current Price + Volatility% drive the levels — High and Low are shown for reference but the step = Price × Vol%.
For Gann Fan Angle, the Price Range = CMP × Vol% — same base as Method 1, but then the Square of 9 transformation fans levels outward from CMP — Buy Price = 1×4 (nearest level above), Sell Price = 4×1 (nearest level below).
Use 10-day historical volatility for best results; default 1% is a rough estimate.
If price gaps beyond Target 1 on open, recalculate using the new open price.
Gann levels work best in trending markets; use with caution in choppy/sideways markets.
Always combine Gann levels with volume, RSI, or price action for confirmation.

⚠️ Trading Cautions

Never trade solely on Gann levels — always confirm with other indicators.
GAV vs Range Step give different results — both are valid; choose based on your data availability and style.
High volatility widens Gann zones — treat levels as zones, not exact points.
Use stop-losses at every trade. Gann levels do NOT guarantee reversals.
For options trading, apply Gann only to the underlying instrument price, not the option premium.
Do NOT over-leverage based on Gann projections alone.
Past accuracy of Gann levels for an instrument does not guarantee future accuracy.
The Range Step method produces very tight levels when volatility is low — use GAV for wider, more actionable zones.

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Disclaimer: This calculator is provided for educational and informational purposes only. It does not constitute financial, investment, or trading advice. Trading carries substantial risk of loss and is not suitable for every investor. Past performance is not indicative of future results. Always consult a qualified financial advisor and conduct your own due diligence before making any trading or investment decisions.

𝑓(x) Gann Angle Formulas & Reference

📊 Method 1 — Simple Gann Angle

Step 1 · Calculate the Step Size

Step = Current Price × (Volatility% ÷ 100) Example (Price=21350, Vol=1%): Step = 21350 × 0.01 = 213.50 points ⚠ Note: High and Low are NOT used in the step calculation. Only the current price × volatility matters.

The step is derived from the current price scaled by volatility — not from the H-L range. This makes the step proportional to the actual price level, giving meaningful spacing regardless of the instrument’s absolute price.

Step 2 · Long Levels (Resistance)

Buy Price = Current Price + Step Target 1 = Buy Price + (1 × Step) Target 2 = Buy Price + (2 × Step) … Target 8 = Buy Price + (8 × Step) Example (Price=21350, Step=213.5): Buy Price = 21350 + 213.5 = 21,563.5 Target 1 = 21,563.5 + 213.5 = 21,777.0 Target 2 = 21,563.5 + 427.0 = 21,990.5 Target 8 = 21,563.5 + 1708 = 23,271.5

All 9 levels fan upward from current price in equal steps. The buy signal triggers when price crosses above Buy Price.

Step 3 · Short Levels (Support)

Sell Price = Current Price − Step Target 1 = Sell Price − (1 × Step) Target 2 = Sell Price − (2 × Step) … Target 8 = Sell Price − (8 × Step) Example (Price=21350, Step=213.5): Sell Price = 21350 − 213.5 = 21,136.5 Target 1 = 21,136.5 − 213.5 = 20,923.0 Target 2 = 21,136.5 − 427.0 = 20,709.5 Target 8 = 21,136.5 − 1708 = 19,428.5

Short levels mirror the long levels — anchored to current price, stepping downward uniformly. Sell signal triggers when price breaks below Sell Price.

Key Insight & When to Use

Why Price × Vol% (not H-L × Vol%)? Price × Vol% = 21350 × 0.01 = 213.5 ✔ H-L × Vol% = 300 × 0.01 = 3.0 ✗ (too tight) Using Price ensures the step is always proportional to the instrument’s value. ✔ Only today’s Price + Vol% needed ✔ Simple, fast intraday levels ✔ Works for any instrument price level ✔ Matches MarketBulls output exactly

The key insight is that High and Low are only used as context — the actual step and all level calculations use Current Price × Volatility% as the base unit.

🔺 Method 2 — Gann Fan Angle · Square of 9

Step 1 · Calculate Price Range

Price Range (PR) = Current Price × (Volatility% ÷ 100) Example (CMP=21350, Vol=1%): PR = 21350 × 0.01 = 213.50 points ⚠ Uses CMP — NOT Previous Close, NOT (High − Low). Both methods use Price × Vol% as base.

Price Range is the expected daily movement, derived from the current price scaled by volatility — the same base as Method 1, but then transformed non-linearly via Square of 9.

Step 2 · Degree Factor per Angle

Degree Factor = Angle (degrees) ÷ 180 Per W.D. Gann: 180° = factor of 1.0 Examples: 45° (1×1) → 45 ÷ 180 = 0.2500 63.75° (2×1) → 63.75 ÷ 180 = 0.3542 26.25° (1×2) → 26.25 ÷ 180 = 0.1458 82.5° (8×1) → 82.5 ÷ 180 = 0.4583

Each Gann angle maps to a degree and a factor. The 1×1 at 45° is the master balance line.

Step 3 · Resistance Levels (from HIGH)

Res_PR(n) = (√PR + Factor_up(n))² Resistance(n) = HIGH + Res_PR(n) × Factor_up(n) Example for 1×2 angle (factor=0.1458): √213.5 = 14.6116 Res_PR = (14.6116 + 0.1458)² = 217.78 R(1×2) = 21500 + 217.78 × 0.1458 = 21500 + 31.75 = 21,531.76 ↑ anchored to HIGH

All resistance levels fan upward from the session HIGH — not from CMP. The 1×2 resistance is the Buy Price trigger.

Step 4 · Support Levels (from LOW)

Sup_PR(n) = (√PR − Factor_dn(n))² Support(n) = LOW − Sup_PR(n) × Factor_dn(n) Example for 2×1 angle (factor=0.3542): Sup_PR = (14.6116 − 0.3542)² = 203.28 S(2×1) = 21200 − 203.28 × 0.3542 = 21200 − 71.98 = 21,128.01 ↑ anchored to LOW

All support levels fan downward from the session LOW. The 2×1 support (mirror of 1×2 resistance) is the Sell Price trigger.

Why HIGH/LOW Anchors — Not CMP?

Resistance from HIGH: → Levels are above the day’s HIGH → Act as true breakout targets → Price must exceed HIGH first Support from LOW: → Levels are below the day’s LOW → Act as true breakdown targets → Price must breach LOW first CMP is only used for Price Range (PR) HIGH/LOW are the fan anchor points

This is the key insight: CMP scales the angle fan size, but HIGH and LOW position where the fan is anchored — making levels truly outside today’s range.

Full Output — Your Sample Numbers

Inputs: H=21500 L=21200 P=21350 V=1% PR = 21350 × 0.01 = 213.5 Resistance (from HIGH=21500): 16×1 → 21,609.12 8×1 → 21,604.09 4×1 → 21,594.10 3×1 → 21,589.15 2×1 → 21,579.32 1×1 → 21,555.22 ★ 1×2 → 21,531.76 ← BUY PRICE Support (from LOW=21200): 1×16 → 21,195.56 1×8 → 21,191.15 1×4 → 21,182.41 1×3 → 21,178.08 1×2 → 21,169.48 1×1 → 21,148.44 ★ 2×1 → 21,128.01 ← SELL PRICE

Buy above 21,531.76 | Sell below 21,128.01 — these match SmartFinanceIn output exactly.

📋 Complete Gann Angle Reference Table

Angle (Up)	Degree	Factor	Angle (Down)	Degree	Factor	Role
16×1	86.25°	0.4792	1×16	3.75°	0.0208	Extreme / Outer
8×1	82.5°	0.4583	1×8	7.5°	0.0417	Strong Momentum
4×1	75°	0.4167	1×4	15°	0.0833	Strong Trend
3×1	71.25°	0.3958	1×3	18.75°	0.1042	Secondary Trend
2×1	63.75°	0.3542	1×2	26.25°	0.1458	Key R/S Level
1×1 ★	45°	0.2500	1×1 ★	45°	0.2500	Master Balance Line
1×2	26.25°	0.1458	2×1	63.75°	0.3542	Buy / Sell Trigger
1×3	18.75°	0.1042	3×1	71.25°	0.3958	Minor Level
1×4	15°	0.0833	4×1	75°	0.4167	Stop-Loss Zone
1×8	7.5°	0.0417	8×1	82.5°	0.4583	Shallow / Weak
1×16	3.75°	0.0208	16×1	86.25°	0.4792	Extreme / Outer