What Is Position Sizing?

Most new traders spend all their energy picking the “right” stock or the “right” setup. Entry point, chart pattern, indicator confirmation and hours go into all of that. And then, almost as an afterthought, they decide how much money to put into the trade. Usually it is whatever feels right in the moment, or worse, whatever their available margin allows.

You can have a fantastic strategy with a 70% win rate and still blow up your account if you size your trades badly. On the flip side, a simple strategy with disciplined position sizing can keep you in the game long enough to gain in a trade. 

This is the part of trading that does not get talked about enough, so let us decode this.

What is Position Sizing 

It is deciding how many shares, lots, or contracts to buy or sell in a single trade, based on your account size and how much you are willing to lose if the trade goes wrong.

It is not about how much you want to make, it is about how much you can afford to lose.

Example: 

Think of it this way: 

If you have ₹5 lakh in your trading account and you put ₹4 lakh into one stock, a 10% drop wipes out 8% of your entire capital in one shot. In this scenario, good position sizing keeps any single trade from being able to hurt you badly. 

Formulas are fine on paper, but they click properly only when you understand them through a real scenario.

Suppose your trading account has ₹3,00,000 in it, and you have decided, like most sensible traders do, that no single trade should risk more than 1.5% of that capital. 

You did the math, and that is ₹4,500. This is your ceiling. Whatever happens, you are not comfortable losing more than this on one trade.

Let us say there is a stock at ₹850, and your stop-loss, based on support levels or whatever your chart is telling you, comes to ₹820. 

That is a ₹30 gap between your entry and your exit if things go wrong.

Now just divide: ₹4,500 / ₹30 = 150 shares.

This is your position size. If the trade fails and hits your stop loss, you are out ₹4,500

Here is where most beginners go wrong, though. They look at ₹850 and think “I can afford 300 of these,” and just buy that many because their capital allows it. 

Sounds harmless, right? Except now their real risk on the same stop-loss has jumped to ₹9,000, which is 3% of their account. This is exactly how disciplined-looking trading plans fall apart 

Methods of Position Sizing 

1. Fixed Rupee Amount

You decide to put, say, ₹20,000 into every trade regardless of the stock. But it does not account for how volatile the stock is. A ₹20,000 position in a range-bound FMCG stock carries very different risk than the same amount in a small-cap that swings 5% a day.

2. Percentage of Capital 

Here you risk a fixed percentage of your total account on every trade, say 2%. As your account grows, your position sizes naturally grow with it, and if you hit a rough patch, the % is reduced too. 

3. Risk-per-Trade 

This is probably the most practical method for active traders. You first decide how much rupee amount you are willing to lose on a trade, then work backwards from your stop-loss to figure out how many shares that translates to.

Say you have ₹5,00,000 in capital, you are willing to risk 1% per trade (₹5,000), and you are buying a stock at ₹500 with a stop-loss at ₹480. 

Your risk per share is ₹20. Divide ₹5,000 by ₹20, and you get 250 shares. That is your position size.

Read Also: Partially Filled in Trading

Common Mistakes to Avoid 

• Over-leveraging: Using more capital or margin than your account can absorb turns normal market moves into loss-making events. If the trade goes against you and your margin shrinks, you are looking at a margin call, and if you cannot meet it, the broker liquidates your position for you, often at the worst possible price.
• Skipping stop-losses: Position sizing calculations are only meaningful if you respect the stop-loss you create around them. So many traders size their position correctly, then move or ignore the stop-loss when the trade starts going wrong, turning a small planned loss into a much bigger unplanned one.
• Increasing size after a loss: That overwhelming feeling to “win it back” after a loss is another classic trap. Commonly called revenge trading. It feels logical in the moment but almost always leads to bigger losses, because you are now making decisions from a place of emotion rather than a plan.

A Simple Rule of Position Sizing 

Most experienced traders settle on risking somewhere between 1-2% of their capital per trade. 

Some use a 3-5-7 structure, which means capping any single trade at 3%, total exposure across all open trades at 5%, and aiming for winning trades to be at least 7% bigger than losing ones on average. 

None of these numbers is magic, but having some consistent rule beats getting confused every single time.

Conclusion 

Nobody brags about their risk-per-trade calculation the way they brag about a winning trade. But it is the difference between traders who survive long enough to get good at this and those who do not. Get your entries and exits reasonably right, size your positions rationally, and the rest of trading gets a lot less stressful.

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