Position Sizer and Calculator

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Position Sizer and Calculator (PSC)

A professional-grade position sizing and risk evaluation tool designed to quantify trade exposure directly from chart-defined levels.

This script calculates trade size, risk, reward, and performance metrics dynamically based on your selected Entry, Take Profit, and Stop Loss levels.

It is designed for disciplined traders who manage capital allocation through structured risk control.

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Overview

The Position Sizer and Calculator operates on a capital-allocation model.

The trader defines the total dollar amount intended for the position. Risk is then derived automatically from the selected Stop Loss level. All outputs update in real time as Entry, TP, or SL levels are adjusted on the chart.

This ensures immediate visibility into:

• Position size
  
• Dollar risk
  
• Risk percentage
  
• Profit potential
  
• Risk/Reward ratio
  

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User Inputs

Manual Inputs

• Trade Value ($)
  The total capital allocated to the position.
  
• Quantity Decimals
  Controls the number of decimals displayed for share quantity. Fractional shares are supported.
  

Chart-Selected Inputs

• Entry
  
• Take Profit (TP)
  
• Stop Loss (SL)
  
• Anchor bar (time reference)
  

Levels are selected directly on the chart using TradingView’s confirmation-click system. Adjusting these levels automatically recalculates all metrics.

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Calculation Methodology

The script uses the following formulas:

• Shares Quantity
  Qty = Trade Value ÷ Entry Price
  
• Risk per Share
  Risk per Share = |Entry − SL|
  
• Total Risk (Dollar Risk)
  Risk = Risk per Share × Qty
  
• Risk Percentage of Trade Value
  Risk % = (Risk ÷ Trade Value) × 100
  
• Reward per Share
  Reward per Share = |TP − Entry|
  
• Profit at Target
  Profit = Reward per Share × Qty
  
• Risk/Reward Ratio
  R:R = Reward per Share ÷ Risk per Share
  

All risk and reward calculations use absolute price distances to ensure correct handling of both long and short configurations.

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Table Output

The summary table displays the following metrics in structured order:

• Trade Value
  
• Shares Quantity
  
• Entry
  
• Take Profit
  
• Stop Loss
  
• Profit at Target
  
• Risk (Dollar Risk)
  
• Risk % (of Trade Value)
  
• Risk/Reward Ratio
  

Values update immediately when price levels or trade value are adjusted.

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Structural Controls

The script enforces logical trade structure:

• TP and SL cannot both be above Entry.
  
• TP and SL cannot both be below Entry.
  
• Risk is always derived from the Stop Loss.
  
• Long and short configurations are automatically detected.