Position sizing is not your win rate — here's the math

Most retail traders obsess over win rate. They share screenshots of "80% accuracy" courses. They argue about which strategy is "high probability." Meanwhile professional traders quietly accept 40-50% win rates — and outperform almost every retail trader. Why?

Because position sizing dominates win rate. Always has, always will.

The 1% rule, and why it's not arbitrary

Risk no more than 1–2% of capital on any single trade. On ₹1,00,000, that's ₹1,000–₹2,000 per trade. This isn't a guess — it's the maximum risk per trade that keeps you in the game through any realistic losing streak.

A 10-trade losing streak at 1% risk costs you 10% of capital. Recoverable. At 5% risk it costs you 40%. To recover from 40% drawdown you need a 67% gain. That's how blowups happen — not from one bad trade, but from one bad position size on a normal losing streak.

The break-even math

• →At 1:1 R:R you need to win 50% to break even
• →At 1:2 R:R you need 33%
• →At 1:3 R:R you need 25%
• →A 40% win rate trader at 1:3 R:R makes money. A 70% win rate trader at 1:0.5 R:R bleeds out.

The formula

Position size = (Capital × Risk%) / (Entry − Stop Loss). That's it. The Position Size Calculator does this for you — but understand it, don't black-box it.

Written byTrading Analyst & Contributor

Ahmed Solanki

Ahmed Solanki is a Trading Analyst & Contributor at QbarTrade. He specializes in market structure, options risk engineering, and execution analytics for retail and active traders in Indian markets.