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The setup tells you what to trade. This number tells you how many lots you're actually allowed to trade โ and it has nothing to do with how confident you feel.
To size an options trade by capital risk: Max Risk Amount = Trading Capital ร Risk % (typically 3% or 4% per trade). Divide that by your risk per lot โ (Entry Premium โ Stop-Loss Premium) ร Lot Size โ to get the maximum number of lots you can trade without breaching your risk limit. Round down, not up. A โน5,00,000 account risking 3% per trade has โน15,000 to lose on that trade, full stop, regardless of how good the setup looks.
Position size is the number of lots or shares you trade, calculated backward from how much rupee loss you're willing to accept โ not forward from how much you'd like to make.
Ask a trader how many lots they took and the answer is often "felt right for the setup." Ask them to show the math behind that number, and most can't, because there usually isn't any. Position size isn't a feeling โ it's the direct output of two numbers you already have before entry: how much capital you're willing to risk, and how much each lot costs you if the stop-loss is hit. Everything else is a guess dressed up as conviction.
A setup tells you when a trade may be worth considering. Risk management tells you how much that idea is allowed to cost you. Position sizing is where that risk limit turns into an actual number of lots โ and it's the step that decides whether five losing trades in a row are a bad week or the end of an account.
Here's where it gets interesting: two traders can take the exact same setup, with the exact same stop-loss, and end up with completely different outcomes purely because of lot count. One sized the trade off a fixed percentage of capital. The other sized it off "how many lots I usually take." Only one of those numbers scales down automatically when the account is smaller, or when a losing streak has already eaten into capital.
This works backward from a rupee limit, not forward from a lot count that feels comfortable.
Max Risk Amount = Trading Capital ร Risk %
Risk per Lot = (Entry Premium โ Stop-Loss Premium) ร Lot Size
Max Lots = Max Risk Amount รท Risk per Lot (rounded down)
The risk percentage itself โ commonly 1โ2% for conservative sizing, and 3โ4% for traders running a tighter, more active strategy with strong conviction in their edge โ is a decision made in advance, applied consistently, not adjusted trade to trade based on how the setup feels.
Rounding matters more than it looks. If the math produces 2.7 lots, the answer is 2 lots โ not 3. Rounding up quietly pushes you past your own risk limit on every single trade that doesn't divide evenly.
Yahan problem risk % decide karne ki nahi, use consistently follow karne ki hai โ choosing 3% or 4% is the easy part; sticking to it on the trades that don't feel like it's needed is where discipline actually gets tested.
Enter your capital, choose a risk percentage, and add your entry, stop-loss, and lot size. The calculator rounds down to a safe lot count automatically.
Trading capital: โน5,00,000. Risk per trade: 3%, which sets a hard limit of โน15,000 for this trade โ decided before looking at the setup, not after.
Entry premium: โน220. Stop-loss premium: โน200, placed at the level that invalidates the setup. Risk per unit: โน20. At the current NIFTY lot size of 65, risk per lot works out to โน1,300.
Max lots = โน15,000 รท โน1,300 = 11.5, rounded down to 11 lots. Actual risk at 11 lots is โน14,300 โ under the โน15,000 ceiling, exactly as it should be. Trading 12 lots instead, because "it's basically the same," would push actual risk to โน15,600, past the limit that was set for a reason.
| Capital | 3% Risk Amount | 4% Risk Amount | Practical Read |
|---|---|---|---|
| โน1,00,000 | โน3,000 | โน4,000 | Small accounts feel the difference sharply โ plan lot count accordingly. |
| โน5,00,000 | โน15,000 | โน20,000 | The extra 1% adds real rupee room, but also real rupee downside on a loss. |
| โน10,00,000 | โน30,000 | โน40,000 | At this size, four consecutive losses at 4% removes roughly 15% of capital. |
A higher risk percentage isn't automatically wrong โ it depends on strategy, win rate, and how many consecutive losses the plan can realistically absorb. What matters is picking one number and applying it consistently, not switching between 3% and 4% depending on how a particular setup feels.
Rounding 8.6 lots to 9 "because it's close enough" breaches the risk limit on every trade sized this way, even though the formula itself was correct.
Some traders quietly raise their risk percentage after a drawdown to "make it back faster." This is precisely the moment a fixed, pre-decided percentage matters most โ sizing decisions made under pressure tend to widen risk exactly when the account can least afford it.
Capital changes after every closed trade. A position size calculated off last week's account balance doesn't reflect what 3% or 4% actually means today, especially after a run of wins or losses.
"I always trade 5 lots" ignores that risk per lot changes with every setup's stop-loss distance. Five lots on a โน10 stop-loss and five lots on a โน30 stop-loss are not the same risk decision.
It depends on strategy and win rate. Many conservative traders cap risk at 1โ2% per trade, while traders with a well-tested edge and strong risk-reward may run 3โ4%. The number matters less than applying it consistently and understanding how many consecutive losses your account can absorb at that level.
Multiply your trading capital by your chosen risk percentage to get your max rupee risk, then divide that by the risk per lot โ the premium difference between entry and stop-loss, multiplied by lot size. Round the result down to the nearest whole lot.
Always down. Rounding up means the trade risks more than your chosen percentage, which defeats the purpose of calculating a limit in the first place.
Yes. A wider stop-loss increases the risk per lot, which reduces the maximum number of lots you can trade at the same risk percentage. Position size and stop-loss distance move in opposite directions for a fixed rupee risk.
Yes, using your updated capital figure โ but the risk percentage itself should stay fixed rather than being adjusted upward to recover losses faster, which is a common way small drawdowns turn into large ones.
No. Reward to risk ratio measures whether a trade's potential payoff justifies its risk. Position sizing measures how many lots of that trade your capital can safely support. Both are needed together before entry.
Before you think about the target, know exactly how much you are willing to lose if the setup fails โ as a fixed percentage of today's capital, not a lot count that feels familiar. Run every trade through the calculator above, round down without exception, and let the number decide the lot count instead of the setup's appeal.
If you want a structured, chart-based framework for entries, confirmation, and stop-loss placement on NIFTY and Bank Nifty options, the CPR Brahmastra webinar walks through the rules step by step.
Explore the CPR Brahmastra WebinarThis article is for educational purposes only and does not constitute investment advice. Lot sizes for index options are set by the exchange and revised periodically โ confirm current figures on the NSE or BSE website before trading. Trading in the securities market involves risk of loss. Past performance and hypothetical examples are not indicative of future results. Please consult your financial advisor before investing.
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