Build dynamic qty calculator based on the entry and stop loss for risk management on zerodha

:sparkles: Key Features
:bar_chart: Position Sizing

Automatic quantity calculation based on your risk percentage
Supports custom leverage (1x to 100x)
Margin requirement display
Buying power validation with warnings

:dart: Multi-Target System

Target 1 (T1): Primary profit target (always active)
Target 2 (T2): Optional secondary target (toggle ON/OFF)
Target 3 (T3): Optional tertiary target (toggle ON/OFF)
All targets support drag-and-drop adjustment on chart
Individual R:R ratio for each target

:moneybag: Accurate Indian Market Charges

STT (Securities Transaction Tax): Segment-specific rates
Brokerage: 0.03% or ₹20 cap (Equity) / Flat ₹20 (F&O)
Transaction Charges: NSE/BSE specific rates
SEBI Charges: ₹10 per crore
Stamp Duty: State-wise rates
GST: 18% on brokerage + transaction charges

:chart_with_upwards_trend: Live Tracking

Real-time P&L tracking
Current position status (In Profit / In Loss / At Entry)
Break-even points calculation

:bell: Alerts

Target 1/2/3 hit alerts
Stop loss triggered alert
Entry level cross alert

:hammer_and_wrench: How To Use
Step 1: Add Indicator

Add the indicator to your chart
You’ll be prompted to click on the chart for:

Entry Price
Target 1 Price
Stop Loss Price
Target 2 Price (click anywhere if not needed)
Target 3 Price (click anywhere if not needed)

Step 2: Configure Account Settings

Set your Balance (trading capital)
Set your Leverage (5x = 20% margin)
Select Segment (Equity Delivery/Intraday, F&O Futures/Options)
Select Exchange (NSE/BSE)

Step 3: Set Risk Parameters

Max Loss %: Maximum percentage of capital to risk per trade (default: 1%)
The indicator will calculate optimal quantity based on this

Step 4: Enable Multiple Targets (Optional)

Go to “MULTIPLE TARGETS” section in settings
Enable T2 and/or T3 checkboxes
Drag the lines on chart to adjust prices

Step 5: Analyze & Trade

Review the info table for complete trade analysis
Check R:R ratios, potential P&L, and charges
Set alerts for target/stop levels

:gear: Settings Explained
ACCOUNT
SettingDescriptionBalanceYour total trading capital in ₹LeverageBroker leverage (5x means 20% margin required)SegmentTrading segment for accurate chargesExchangeNSE or BSE
TRADE LEVELS
SettingDescriptionEntryYour planned entry price (drag on chart)Target 1Primary profit target (drag on chart)Stop LossStop loss price (drag on chart)Max Loss %Maximum % of capital to risk (1% = ₹3,110 on ₹3.11L)
MULTIPLE TARGETS
SettingDescriptionEnable T2Toggle to show/hide Target 2T2 PriceSecond target price (drag on chart)Enable T3Toggle to show/hide Target 3T3 PriceThird target price (drag on chart)
DISPLAY OPTIONS
SettingDescriptionValueShow position valueMarginShow margin requiredRRShow Risk:Reward ratioP&LShow profit/loss amountsROIShow return on investment %PointsShow price movement in pointsLive StatusShow real-time P&LChargesShow detailed charges breakdown

:bar_chart: Calculations Explained
Position Sizing Formula
Risk Amount = Balance × (Max Loss % / 100)
Stop Distance % = |Entry - Stop Loss| / Entry × 100
Position Value = Risk Amount / (Stop Distance % / 100)
Quantity = Position Value / Entry Price (rounded down)
Risk:Reward Ratio
R:R = Target Distance / Stop Distance

Green: R:R ≥ 2.0 (Excellent)
Yellow: R:R ≥ 1.5 (Good)
Orange: R:R < 1.5 (Caution)

Required Win Rate
Win Rate = 1 / (1 + R:R) × 100
Example: R:R of 2.0 requires only 33.3% win rate to break even
Charges Calculation (Round Trip)
Equity Delivery:

STT: 0.1% on buy + 0.1% on sell
Stamp Duty: 0.015% on buy

Equity Intraday:

STT: 0.025% on sell only
Stamp Duty: 0.003% on buy

F&O Futures:

STT: 0.02% on sell only
Stamp Duty: 0.002% on buy

F&O Options:

STT: 0.1% on sell (on premium)
Stamp Duty: 0.003% on buy

Common Charges:

Brokerage: Min(0.03%, ₹20) per side for Equity, ₹20 flat for F&O
Transaction: 0.00297% (NSE Equity), varies by segment
SEBI: ₹10 per crore
GST: 18% on (Brokerage + Transaction + SEBI)

:clipboard: Info Table Fields
FieldDescriptionBalanceYour trading capitalLeverageCurrent leverage settingSegmentSelected trading segmentDirectionLONG or SHORT (auto-detected)RiskYour max loss percentageQuantityCalculated shares/lots to tradeValueTotal position valueInitial MarginMargin required to take positionT1/T2/T3 ProfitPotential profit at each targetPotential LossMaximum loss if stop loss hitsR:R (T1/T2/T3)Risk:Reward ratio for each targetReq. Win RateMinimum win rate neededChargesDetailed breakdown of all chargesBreak-even PtsPoints needed to cover chargesNet T1/T2/T3Profit after deducting chargesLive P&LCurrent unrealized P&LStatusIN PROFIT / IN LOSS / AT ENTRY

:warning: Warnings & Validations
The indicator shows warnings for:

Exceeds buying power: Position value > Balance × Leverage
T2/T3 needs price: Enabled but price not set
T2 should be above/below T1: Invalid target placement
T3 should be above/below T2: Invalid target placement
Setup Error: Stop loss on wrong side of entry

:bell: Available Alerts

Target 1 Hit - Price reaches T1
Target 2 Hit - Price reaches T2 (when enabled)
Target 3 Hit - Price reaches T3 (when enabled)
Stop Loss Hit - Price triggers stop loss
Entry Level - Price crosses entry level

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