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Position Sizing: How much capital to invest per trade? —Complete Hinglish Guide
Published by The Retail Trader · AUG 14, 2026 · Features
Everyone focuses on “what to buy”. Professional traders focus on "how much to buy". Position sizing is the skill that makes 90% of traders unsuccessful — because they ignore it.
Simple truth: Your stock selection may be 60% accurate, but if the position sizing is wrong then the account will be zero. Conversely, average stock selection + perfect position sizing = profitable trader.
Rule: Never lose more than 1% of your total capital in a single trade.
Example:
• Total capital: ₹1,00,000
• Max risk per trade: ₹1,000 (1%)
• Stock entry: ₹500
• Stop-loss: ₹490 (₹10 risk per share)
• Position size: ₹1,000 / ₹10 = 100 shares
• Total investment: 100 × ₹500 = ₹50,000
Keep in mind: Risk ≠ Investment. You are investing ₹50,000 but the risk is only ₹1,000 (if the stop-loss is hit).
Scenario: 5 Consecutive Losses:
• 1% rule — Loss Per Trade: ₹1,000, Total Loss: ₹5,000, Remaining: ₹95,000, Recovery Needed: +5.3%
• 5% rule — Loss Per Trade: ₹5,000, Total Loss: ₹25,000, Remaining: ₹75,000, Recovery Needed: +33.3%
• 10% rule — Loss Per Trade: ₹10,000, Total Loss: ₹50,000, Remaining: ₹50,000, Recovery Needed: +100%
• 20% rule — Loss Per Trade: ₹20,000, Total Loss: ₹1,00,000, Remaining: ₹0, Recovery Needed: GAME OVER
With the 1% rule, even after 5 losses, you need only a 5.3% recovery. With the 10% rule, you need a 100% recovery — almost impossible.
Mathematical Proof:
• With 1% risk: 60% of the account will be protected even from 50 consecutive losses
• With 5% risk: 20 consecutive losses = account zero
• With 10% risk: 10 consecutive losses = account zero
Professional traders risk 0.5-1%. Beginners should risk 0.5%.
Position Size = (Capital × Risk %) / (Entry Price - Stop-Loss Price)
Example 1: Standard Trade
Keep these seven points in mind:
• Capital: ₹2,00,000
• Risk per trade: 1% = ₹2,000
• Entry: ₹1,000
• Stop-loss: ₹960
• Risk per share: ₹40
• Position size: ₹2,000 / ₹40 = 50 shares
• Investment: 50 × ₹1,000 = ₹50,000
Example 2: Tight Stop-Loss
Keep these seven points in mind:
• Capital: ₹2,00,000
• Risk: 1% = ₹2,000
• Entry: ₹500
• Stop-loss: ₹495
• Risk per share: ₹5
• Position size: ₹2,000 / ₹5 = 400 shares
• Investment: 400 × ₹500 = ₹2,00,000 (100% of capital!)
⚠️ Warning: Tight stop-loss means large position. Investment = 100% of capital is risky. Even though "risk" is only ₹2,000, if stock gaps down below stop-loss, actual loss can be much larger.
Example 3: Wide Stop-Loss
Keep these seven points in mind:
• Capital: ₹2,00,000
• Risk: 1% = ₹2,000
• Entry: ₹1,500
• Stop-loss: ₹1,400
• Risk per share: ₹100
• Position size: ₹2,000 / ₹100 = 20 shares
• Investment: 20 × ₹1,500 = ₹30,000
Just deciding risk per trade is not enough. Reward should also be seen.
Minimum R:R = 1:2
Keep these three points in mind:
• Risk ₹1,000 → Target profit ₹2,000
• Profitable even if win rate is 40%:
• 10 trades: 4 wins (₹8,000) - 6 losses (₹6,000) = +₹2,000 net profit
Formula with R:R:
• Position Size = (Capital × Risk %) / Risk Per Share
• Target Price = Entry + (Risk Per Share × Reward Ratio)
Example: 1:3 R:R Trade:
• Capital: ₹1,50,000
• Risk: 1% = ₹1,500
• Entry: ₹300
• Stop-loss: ₹285 (₹15 risk per share)
• Position size: ₹1,500 / ₹15 = 100 shares
• Target: ₹300 + (₹15 × 3) = ₹345
• Potential profit: ₹45 × 100 = ₹4,500
• Potential loss: ₹15 × 100 = ₹1,500
• R:R = 1:3 ✅
Rule: Total open risk (combined risk of all open trades) should not exceed 5-6% of capital.
Example:
• Capital: ₹1,00,000
• Max total open risk: ₹5,000 (5%)
• Max trades at 1% risk each: 5 simultaneous trades
Keep these six points in mind:
• Trade 1 — Risk: ₹1,000, Total Open Risk: ₹1,000
• Trade 2 — Risk: ₹1,000, Total Open Risk: ₹2,000
• Trade 3 — Risk: ₹1,000, Total Open Risk: ₹3,000
• Trade 4 — Risk: ₹1,000, Total Open Risk: ₹4,000
• Trade 5 — Risk: ₹1,000, Total Open Risk: ₹5,000
• Trade 6 — Risk: ❌ NO, Total Open Risk: Exceeds 5% limit
Why Total Open Risk Matters:
• If market crashes and all stop-losses are hit, max loss = 5%
• 5% loss recoverable (5.3% gain to recover)
• If 10 trades are open 1% risk each = 10% total risk = dangerous
Intraday Trading:
• Risk per trade: 0.5-1% (tighter, because more trades per day)
• Max trades/day: 3-4
• Total daily risk: 2-3% max
• Stop-loss: 0.5-1% from entry (tight)
• Position size: Large shares, small risk per share
Swing Trading (2-7 days):
• Risk per trade: 1-2%
• Max simultaneous trades: 5-6
• Total open risk: 5-8%
• Stop-loss: 2-4% from entry
• Position size: Moderate
Position Trading (weeks-months):
• Risk per trade: 1-2%
• Max simultaneous positions: 8-10
• Total open risk: 10-15% (wider stops, longer time)
• Stop-loss: 5-8% from entry
• Position size: Smaller shares, wider stop
Long-Term Investing:
• Risk per position: 2-5% of portfolio (not stop-loss based)
• Diversification: 10-15 stocks across sectors
• No stop-loss: Hold through volatility
• Position size: Based on conviction and valuation
Problem: Trader always buys 100 shares, regardless of stop-loss distance. Consequence: Tight stop-loss trade = high risk. Wide stop-loss trade = low risk. Inconsistent.
Fix: Fix the risk amount (1%), calculate the quantity based on stop-loss.
Problem: "Today it is a sure shot, I will buy 500 shares." Result: Sure shot does not happen. 500 shares × big loss = account damage.
Fix: No "sure shot" exists. Always 1% risk rule. No exceptions.
Problem: Stock fell. And bought. Ab total position 2x. Total risk 2x. Result: Original risk was 1%, now it became 2%. Double danger.
Fix: Don't average down in trading. If thesis broken, exit.
Problem: Stop-loss is at ₹490. Stock overnight gap down at ₹470. Loss = ₹30/share, not ₹10. Result: Actual loss 3x more than planned.
Fix: Reduce position size for stocks prone to gaps. Don't hold overnight with tight stop-loss.
Problem: Took 3x position from Margin trading. Risk also 3x. Result: One bad trade = 3% loss instead of 1%. Three bad trades = 9% loss.
Fix: Leverage = multiplied risk. If using MTF, reduce position size to keep actual risk at 1%.
Quick Formula For 1% Risk:
• Step 1: Capital × 0.01 = Max Risk Amount
• Step 2: Entry - Stop-loss = Risk Per Share
• Step 3: Max Risk Amount / Risk Per Share = Number of Shares
Quick Example:
• Capital: ₹1,00,000
• Max risk: ₹1,000
• Entry: ₹200, SL: ₹190
• Risk per share: ₹10
• Shares: ₹1,000 / ₹10 = 100 shares
• Investment: 100 × ₹200 = ₹20,000
Mental check: ₹20,000 investment = 20% of capital. Risk ₹1,000 = 1%. ✅
Q: Why 1% rule, why not 2%? A: 1% is conservative. 0.5-1% perfect for beginners. Experienced traders use 1-2%. 10 consecutive losses at 2% = 20% drawdown — painful but survivable. 10 losses at 5% = 50% — almost impossible to recover.
Q: How to do position sizing in F&O? A: Same 1% rule. In F&O the lot size is fixed, so calculate: (Lot Size × Premium) = total risk. If it is more than 1% then do not trade or use smaller lots.
Q: How much capital should be invested in a trade? A: Investment amount ≠ Risk amount. You can invest 50% capital in a trade if the stop-loss is tight (risk only 1%). General rule: Do not invest more than 20-30% in a single trade.
Q: How many stocks should there be in the portfolio? A: Trader: 3-5 open positions max. Investor: 10-15 stocks across sectors. <3 = under-diversified. >20 = over-diversified, hard to track.
Q: Re-enter the same stock after stop-loss is hit? A: Yes, but position size same (1% risk). Re-entry is a new trade — previous loss is sunk cost. New trade = new risk calculation.
Keep these ten points in mind:
• Risk per trade = 1% of capital (0.5% for beginners)
• Position size = Max Risk / Risk Per Share
• Total open risk ≤ 5% of capital
• Risk:Reward minimum 1:2
• No "sure shot" exception — always 1% rule
• Don't average down in trading
• Account for gap risk — reduce size if stock gaps
• Leverage multiplies risk — reduce size accordingly
• Capital preservation > profit generation
• Position sizing is THE skill that separates pro from amateur
The Retail Trader — Educational market analysis. Not investment advice. Position sizing is your survival tool — use it every trade, no exceptions.
This article is for educational purposes only. It is not a buy or sell recommendation, a claim of guaranteed returns, or advisory guidance. Exchanges, SEBI and RBI change rules, rates and procedures from time to time, so verify every figure with your broker or an official source.