⚠️ Educational Content Only — Not Investment Advice
This material was created as a personal learning exercise with AI assistance for educational purposes. The author is not a SEBI-registered investment advisor, financial advisor, or research analyst. Nothing here constitutes a recommendation to buy, sell, or hold any security.
All examples, price levels, and scenarios shown are illustrative — used to explain concepts, not to suggest trades. Specific stock names appear as case studies for pattern recognition only. Stock data may be outdated. Markets are risky; you can lose money.
Always do your own research and consult a SEBI-registered advisor or other qualified professional before making investment decisions.
By continuing, you acknowledge this is educational content and accept full responsibility for any decisions made.
📐 Position Sizing: The Math That Keeps You In The Game
Most traders blow up not because they pick bad stocks but because they bet too much on each one. Position sizing answers one question: "If I'm wrong, how much do I lose?" — and works backward from there.
The 1% Rule (the foundation)
Never risk more than 1–2% of your total account on a single trade. "Risk" here means the amount you lose if your stop-loss hits — not the amount you put into the trade. This is the single rule that separates surviving traders from blown-up traders.
Why 1%? Math. Even a great trader loses 30–40% of their trades. If you risk 10% per trade and lose 5 in a row (which happens), you're down 41% and need a 70% gain just to get back to breakeven. If you risk 1% per trade, the same losing streak costs you ~5% — totally recoverable.
The drawdown math:
Loss
Gain needed to recover
10%
11%
20%
25%
30%
43%
50%
100%
75%
300%
90%
900%
Big losses are non-linear. A 50% drawdown isn't twice as bad as a 25% drawdown — it's much worse, because you need to double your remaining money just to get back to even. Avoiding ruinous losses is mathematically more important than catching big winners.
Position Size Calculator
🧮 How many shares should I buy?
Account size
Total capital you're trading with
Risk per trade (%)
Recommended: 1% (max 2%)
Entry price
Where you plan to buy
Stop-loss price
Where you'll exit if wrong
Target price (optional)
For risk/reward ratio
Risk per share$42.00
Risk per share (%)12.10%
Max dollar risk$1,000
📊 Position size (shares)23
Position value$7,981
% of account in this trade7.98%
Potential profit if target hit$1,909
Risk/Reward ratio1 : 1.98
The formula:
Position Size = (Account × Risk%) ÷ (Entry − Stop)
Example (AMD):
$100,000 account × 1% risk = $1,000 max loss
Entry $347, Stop $305 → risk per share = $42
$1,000 ÷ $42 = 23 shares
Position value = 23 × $347 = $7,981 (about 8% of account)
Why this changes everything
Notice something? With a $100K account and 1% risk, you're putting 8% of your account into AMD — but only risking 1%. The position size adapts to where your stop is. This is the magic of risk-based sizing.
Try it. Change the stop to $325 (tighter) — your share count goes up because each share risks less. Change it to $260 (wider) — share count goes down because each share risks more. The dollar risk stays at $1,000 either way. The stop loss determines the position size, not the other way around.
Risk/Reward: never take a bad bet
Minimum risk/reward = 1:2. If you're risking $1 to make $1, you need to win >50% of trades just to break even (after fees). If you're risking $1 to make $2, you only need to win >33%. This is the math of asymmetric bets.
R/R Ratio
Win rate needed to break even
1 : 1
50%
1 : 2
33%
1 : 3
25%
1 : 5
17%
If a setup doesn't offer at least 1:2 risk/reward, don't take it. Period. There will be another setup tomorrow.
Real example: applying this to QPOWER
Let's say you have a ₹5,00,000 account and want to trade QPOWER:
Risk per trade: 1% = ₹5,000
Entry: Wait for pullback to ₹1,082 (the breakout retest level)
Stop loss: ₹950 (just below 50 DMA)
Risk per share: ₹1,082 − ₹950 = ₹132
Position size: ₹5,000 ÷ ₹132 = 37 shares
Position value: 37 × ₹1,082 = ₹40,034 (about 8% of account)
Target: ₹1,500 (measured-move target)
Potential profit: 37 × ₹418 = ₹15,466
Risk/reward: 1 : 3.16 ✅
Now compare: if you instead "felt good" about QPOWER and bought ₹2,00,000 worth (40% of your account) with no stop loss, and the stock dropped to ₹950, you'd lose ₹24,400 — nearly 5% of your account on a single trade. Five trades like that and you're down 25%, which needs a 33% gain to recover. That's how accounts die.
Position sizing rules to live by
Rule
Why
Max 1% risk per trade
Survive losing streaks
Max 5% of account in one position
Limit single-stock blowups
Max 25% of account in one sector
Sector crashes happen
Max 6 open positions at once
You can actually monitor them
Stop loss before entering, not after
Removes emotion from the decision
Never average down on a loser
You're throwing good money after bad
Reduce size after losing streaks
Protect capital when out of sync
The behavioral side (more important than the math)
The math is easy. Following it is hard. Here's what actually trips people up:
Conviction bias: "I'm SURE about this one" → bigger position → bigger loss when wrong. Your conviction has zero predictive value. Treat every trade with the same sizing discipline.
Revenge trading: Just lost? Don't double up to "win it back." This is how 5% losses become 30% losses. Take a break, come back tomorrow.
Moving the stop: "It'll come back" — and now your 1% risk is a 5% loss. Stops are sacred. If you can't trust yourself to honor them mentally, use broker stop-loss orders.
FOMO sizing: Stock is ripping, you weren't in it, you finally jump in with a huge position at the high. This is the worst trade you can make. Size down on extended stocks, not up.
The hard truth: Most retail traders think their job is to pick winners. It isn't. Your job is to manage losers. Winners take care of themselves. Losers, if mismanaged, take your account.
Putting it all together
Before every trade, ask three questions:
Where's my stop? If you can't define it, don't take the trade.
What's my position size based on that stop? Use the formula above.
Is the risk/reward at least 1:2? If not, skip.
If you do these three things consistently, you'll already be ahead of 90% of retail traders — even if your stock-picking is just average.
This is educational content, not investment advice. Position sizing rules don't guarantee profits — they limit losses so you can stay in the game long enough to learn. Trade with money you can afford to lose.