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Position sizing: the one rule that keeps you in the game

SEBI found that 93% of individual F&O traders lost money from FY22 to FY24. The fix starts with how much you risk on each trade. Here's the simple maths.

In September 2024, SEBI published a study of individual traders in equity futures and options. It found that 93% of them lost money between FY22 and FY24. Strategy matters, but what keeps a trader in the game is how much they risk on each idea.

The 1% rule

Decide in advance the most you will lose on one trade, as a share of your trading capital. Many professionals keep it at about 1%. With ₹5,00,000 of capital, 1% is ₹5,000.

From risk to quantity

Quantity = amount you are willing to lose ÷ (entry price − stop-loss price)

Example: you plan to buy at ₹200 with a stop-loss at ₹190, a risk of ₹10 per share. ₹5,000 ÷ ₹10 = 500 shares. If the stop is ₹20 away, the quantity halves to 250. The stop decides the size, not the other way round.

In futures and options the same idea works per lot: work out how much one lot loses between your entry and your stop, and keep the number of lots within your 1%.

Three habits that protect capital

  1. A daily loss limit. For example, stop for the day after two losing trades.
  2. No revenge trades. A loss is information, not something to win back.
  3. A journal. Screenshot every trade with the reason, the result and the lesson.
Position sizing does not make a bad idea good. It makes sure no single idea can knock you out.

Level 1 covers charges, taxes, stop losses and position sizing before any strategy, because this is where most beginners go wrong.

Education only. This article is for learning. It is not investment advice or a recommendation to buy or sell any security.
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