Updated · BreakPoint Research Desk
To size a position, decide the maximum amount you are willing to lose on the trade — commonly 0.5% to 1% of trading capital — then divide it by the distance between your entry price and your stop-loss. The result is the number of shares to buy: Quantity = Risk amount ÷ (Entry − Stop-loss).
With ₹4,00,000 capital and 1% risk, you can lose ₹4,000. If the entry is ₹1,420 and the stop-loss is ₹1,370, the risk is ₹50 per share, so you buy 80 shares. The stop decides the quantity — not how confident you feel.
Key takeaways
Position sizing is deciding how many shares, lots or units to trade so that if your stop-loss is hit, the loss is a fixed, planned fraction of your capital. It is the part of risk management you control completely, and it matters more than most entry techniques because it decides how long you survive a bad run.
Many beginners size by capital (“I will put ₹50,000 in this”) or by feel (“this one looks strong, so double”). Both leave the loss unknown until it happens. Sizing from risk fixes the loss first and lets the quantity follow.
1. Know your trading capital
Use the money actually set aside for trading, as shown in your broker account — not your total savings. Update the number weekly or monthly so the sizing follows your real account.
2. Choose your risk per trade
Decide in advance what fraction of capital one trade may lose. 1% of ₹4,00,000 is ₹4,000; 0.5% is ₹2,000. Beginners and traders in a losing streak are better served at the lower end.
3. Find the stop-loss from the chart
Place the stop where the trade idea is proven wrong — below support, below the breakout level, below the opening range. If entry is ₹1,420 and the stop is ₹1,370, the risk per share is ₹50.
4. Divide
Quantity = ₹4,000 ÷ ₹50 = 80 shares. Round down, never up. The position uses 80 × ₹1,420 = ₹1,13,600 of capital, and a stop-out costs about ₹4,000 plus charges.
Brokerage, STT, exchange charges and slippage are added to every loss. On small intraday targets they can be a meaningful share of the risk, so many traders deduct an allowance before dividing.
Every strategy has losing streaks. Sizing decides whether a streak is an inconvenience or an account-ending event, because losses compound against you: after a deep drawdown, the gain needed to recover rises much faster than the loss.
| Risk per trade | Capital after 10 straight losses | Gain needed to get back |
|---|---|---|
| 0.5% | about 95.1% | about 5.1% |
| 1% | about 90.4% | about 10.6% |
| 2% | about 81.7% | about 22.4% |
| 5% | about 59.9% | about 67% |
Fixed small risk also makes your results readable. When every loss is roughly the same size, your trade journal shows whether the method works, instead of being dominated by one oversized mistake.
| Situation | What changes | Practical adjustment |
|---|---|---|
| Intraday | Tight stops, so share counts can look large; leverage makes it tempting to go bigger | Size from risk first, then check the capital used does not exceed your per-position cap |
| Swing (days to weeks) | Wider stops and overnight gap risk | Lower risk % or smaller cap per position, because gaps can jump past the stop |
| Volatile or small-cap stocks | Wider swings and slippage | Use the lower end, e.g. 0.5%, and accept fewer shares |
| Calmer large-caps | Tighter, more reliable stops | Standard risk %; still keep the per-position cap |
| During a losing streak | Your execution is usually worse too | Halve risk until rules are followed consistently again |
✅ Before every order
The trader finds three setups in a week. Each has a different stop distance, so each gets a different quantity — while the rupee risk stays the same.
Trade B has a tight stop, so 500 shares risk only ₹4,000 — but if the share price is ₹400, that is ₹2,00,000 of capital, half the account. A 25% per-position cap would limit it to ₹1,00,000, or 250 shares, cutting the risk to ₹2,000. Trade C is an expensive, volatile stock with a wide stop, so only 20 shares fit the risk budget.
Risk sets the maximum quantity; the capital cap can only reduce it. Neither is ever increased because a setup “looks strong”.
Sizing by confidence
Doubling size on the trade that “cannot fail” is how one loss erases weeks of gains. Conviction is not information the market has to respect.
Moving the stop to fit the size
If the correct stop is ₹50 away, tightening it to ₹20 so you can buy more shares simply makes the stop-out more likely. Change the quantity, not the level.
Ignoring gaps on overnight positions
A stop-loss order does not protect you from a stock that opens far below it. Swing positions need a smaller size or cap for that reason.
Using full intraday leverage
Margin tells you what the broker allows, not what your risk plan allows. Size from risk, then check leverage, never the other way round.
Forgetting correlated positions
Five bank stocks at 1% each can behave like one 5% position if the sector falls together.
Increasing size after losses to “recover”
Revenge sizing turns a normal losing streak into a drawdown that takes months to repair.
Sizing is a calculation you do yourself — no tool should decide your risk. What helps is keeping the numbers attached to each trade and reviewing them honestly.
Plan with numbers attached
AlphaX keeps buy price, quantity, target and stop-loss together for every position, so the plan you sized is the plan you track.
Review whether you followed it
Trade Diary records entries and exits and summarises them by month, so you can see whether losses stayed near your planned size.
Find objective stop levels
The HLC Scanner shows stocks around their previous day high, low and close — widely watched levels that make stop placement less arbitrary.
The BreakPoint mobile app lets you check your positions and levels away from the desk — useful when a stop is close.
Beginners
Learn this before learning any entry strategy. It is the single habit most likely to keep you in the game long enough to improve.
Intraday traders
Tight stops and leverage make sizing errors fast and expensive; a written calculation before each order prevents most of them.
Swing traders
Combine risk-based sizing with a per-position capital cap to allow for overnight gaps.
Options traders
The principle is identical — cap the rupee loss per trade — but option premiums can fall to zero, so many size on the full premium at risk.
Pick by workflow, not by feature count. You can change plans later.
Free account
Sizing needs only a calculator and discipline. Start with a free account and practise the four steps on paper.
Free
Breakpoint Pro
Breakpoint Pro adds Trade Diary for review and live tools like the HLC Scanner for level-based stops.
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Breakpoint Pro 365
If you also size F&O positions or track the Nifty 500 closely, Pro 365 adds the F&O dashboard suite, OptionX and the Nifty 500 suite to everything in Pro.
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Multiply your trading capital by your risk percentage to get the rupee risk, then divide by the distance between entry and stop-loss. Example: ₹4,00,000 × 1% = ₹4,000; entry ₹1,420 and stop ₹1,370 gives ₹50 risk per share; ₹4,000 ÷ ₹50 = 80 shares.
Buy only as many shares as keep the loss at your stop-loss within your planned risk per trade. Divide the rupee amount you are willing to lose by the per-share distance to the stop, and round down.
Many traders and trading educators use 0.5% to 1% of capital per trade, and lower during losing streaks or while learning. The right number is one you decide in advance and can follow without emotion.
The 1% rule means never losing more than 1% of your trading capital on a single trade. It limits the loss per trade, not the amount invested — you can invest more than 1% as long as the stop-loss caps the loss at 1%.
The calculation is the same. Intraday stops are usually tighter, which allows more shares, so also cap the capital used per position and do not size from the leverage your broker offers.
Place the stop at the level that proves the trade wrong, then let the quantity follow. Tightening a stop only to buy more shares usually increases the chance of being stopped out.
Small, fixed risk keeps drawdowns shallow. With 1% risk, ten straight losses leave about 90% of capital, needing roughly an 11% gain to recover; with 5% risk the same streak leaves about 60%, needing about 67%.
Yes. With ₹50,000 and 1% risk, the budget is ₹500 per trade, which may mean only a few shares or skipping expensive stocks with wide stops. That limitation is protective, not a problem to work around.
It is sensible to. Charges and slippage add to every loss, so many traders deduct an estimate from the risk budget before dividing, especially for intraday trades with small targets.
Keep your quantity, stop and target with each position in AlphaX, and review in Trade Diary whether your losses stayed the size you planned.
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Terms used here: Position Sizing · Stop-Loss · Risk-Reward Ratio · Drawdown · Intraday Trading · Swing Trading
This article is for education only. It is not investment advice or a recommendation to buy or sell any security. Trading involves risk of loss; examples are hypothetical and past behaviour of any pattern does not guarantee future results.