Fixed Fractional Position Sizing: Risk 1% Per Trade With Rupee Examples

Ask most traders how long they spent picking their last stock and they’ll say hours. Ask how long they spent deciding how much to buy and the answer is usually a few seconds. That second decision is the one that decides whether you get through a bad month. Fixed fractional position sizing is the simplest answer professionals use: risk the same small slice of your capital on every single trade.

Below we go through the method, the formula with rupee examples, and why it holds up so well when the losses start piling up.

In this article

1. What is fixed fractional position sizing?
2. The fixed fractional position sizing formula
3. Example 1: Risking 1% on a swing trade
4. Example 2: Same capital, tighter stop
5. Example 3: Same stock, wider stop
6. Why “fractional” matters: it adjusts as you win or lose
7. The losing-streak test
8. Recovery maths: why small losses matter
9. Choosing your fraction: 0.5%, 1% or 2%?
10. Fixed fractional vs other sizing methods
11. Step-by-step routine before every trade
12. Adjustments for real-world trading
13. Common mistakes
14. Frequently asked questions
15. Key takeaways

What is fixed fractional position sizing?

You decide before the trade that, if your stop-loss is hit, you will lose no more than a fixed fraction of your current capital. Typically that’s 1% or 2%.

Notice the word is risk, not investment. Risking 1% does not mean putting 1% of your capital into the trade. It means the loss at your stop-loss works out to 1% of capital. The position itself can be a lot bigger than that.

Investopedia’s position sizing guide puts the rule of thumb plainly: most retail investors risk no more than 2% of their capital on any one trade, and fund managers usually risk less.

Position sizing doesn’t decide whether a trade wins. It decides how much a losing trade can hurt you.

The fixed fractional position sizing formula

There are only three numbers to plug in:

1. Capital: what’s in your trading account right now.
2. Risk %: the share of that capital you’re prepared to lose on this trade.
3. Risk per share: your entry price minus your stop-loss price.

Rupee risk = Capital × Risk %

Quantity = Rupee risk ÷ Risk per share

That’s it. Your stop-loss sets the quantity, not the other way round.

Example 1: Risking 1% on a swing trade

Every figure in these examples is illustrative.

• Capital: Rs 5,00,000
• Risk %: 1%, so rupee risk = Rs 5,000
• Entry: Rs 800
• Stop-loss: Rs 760, so risk per share = Rs 40

Quantity = 5,000 ÷ 40 = 125 shares

The position is worth 125 × 800 = Rs 1,00,000, which is 20% of your capital. But if the stop gets hit, the damage is Rs 5,000, or 1% of capital, before charges and any slippage.

Example 2: Same capital, tighter stop

• Entry: Rs 800
• Stop-loss: Rs 790, so risk per share = Rs 10

Quantity = 5,000 ÷ 10 = 500 shares, so the position is now worth Rs 4,00,000.

Tighten the stop and you can carry a bigger position for the same rupee risk. The catch? A tight stop gets taken out by ordinary price noise far more often. And a position that size may run into your available margin or a sensible concentration limit, so fix a cap on how much of your capital any one position is allowed to take.

Example 3: Same stock, wider stop

• Entry: Rs 800
• Stop-loss: Rs 720, so risk per share = Rs 80

Quantity = 5,000 ÷ 80 = 62 shares (rounded down).

So a jumpy stock that needs room to breathe automatically gets a smaller position. The method handles it.

Stop distance	Quantity	Position value	Loss if stopped
Rs 10	500	Rs 4,00,000	Rs 5,000
Rs 40	125	Rs 1,00,000	Rs 5,000
Rs 80	62	Rs 49,600	Rs 4,960

Why “fractional” matters: it adjusts as you win or lose

The risk is a fraction of current capital, not the number you started with. So position sizes shrink after losses and grow after gains.

• A loss takes capital from Rs 5,00,000 to Rs 4,95,000, and 1% risk drops to Rs 4,950.
• Gains take capital to Rs 5,50,000, and 1% risk rises to Rs 5,500.

This quiet self-correction is why the method is so hard to break. Every trade risks a little less as the account falls, which makes blowing it up genuinely difficult.

The losing-streak test

Investopedia uses a simple illustration: with a 2% limit per trade, even 10 losses in a row would cost about 20% of capital.

With true fixed fractional sizing, where you recalculate risk on current capital after each loss, the hit is a bit smaller. After 10 losses you’re left with 0.98 to the power of 10, roughly 81.7% of where you began. That’s a drawdown of about 18.3%.

Risk per trade	Capital left after 10 straight losses	After 20 straight losses
0.5%	≈95.1%	≈90.5%
1%	≈90.4%	≈81.8%
2%	≈81.7%	≈66.8%
5%	≈59.9%	≈35.8%
10%	≈34.9%	≈12.2%

These are plain compounding sums, before costs. The point is hard to miss: at 10% risk per trade, one bad run eats most of the account.

Losing streaks aren’t a sign you’re doing something wrong. They’re a certainty. Position sizing decides whether you’re still around when the streak ends.

Recovery maths: why small losses matter

Zerodha Varsity’s chapter on position sizing talks about what it calls “recovery trauma”. Lose 5% of capital and you need a 5.3% gain just to get back to square one. Lose 10% and you need 11.1%. At a 60% loss, Varsity points out, you need a 150% gain only to recover.

Drawdown	Gain needed to recover
5%	5.3%
10%	11.1%
20%	25%
50%	100%
60%	150%

Fixed fractional sizing keeps your drawdowns in the shallow end of that table, where climbing back is actually realistic.

Choosing your fraction: 0.5%, 1% or 2%?

• 0.5%: good for beginners, very active traders and anyone still testing a strategy.
• 1%: a common middle path for swing traders who have a tested approach.
• 2%: the top of the range people usually quote. Use it only if you have a proven edge and the discipline to honour your stops.

Then look at total open risk. Five open trades at 1% each means 5% of your capital is on the line at the same time. If those trades move together, say they’re all bank stocks, one ugly session can hit every stop at once.

Fixed fractional vs other sizing methods

Method	How it works	Main drawback
Fixed quantity	Buy the same number of shares every time	Risk varies wildly with stock price and stop distance
Fixed rupee amount	Invest the same amount, for example Rs 50,000, per trade	Ignores the stop-loss, so a volatile stock carries more risk
Fixed rupee risk	Risk the same rupee amount, for example Rs 5,000, per trade	Doesn’t shrink after losses or grow after gains
Fixed fractional	Risk the same percentage of current capital	Slower growth after drawdowns, which is also its strength
Volatility-based	Size using a volatility measure such as ATR to set the stop	More complex. Usually combined with fixed fractional anyway

For most retail traders, fixed fractional is the sweet spot. You can work it out on a notepad, yet it still reacts to both the stop distance and how the account is doing.

A lot of experienced traders pair it with an ATR-based stop. They place the stop at, say, two times the stock’s average true range, and then let the fixed fractional formula decide the quantity.

Step-by-step routine before every trade

1. Write down your current capital.
2. Multiply it by your risk % to get rupee risk.
3. Pick the stop-loss from the chart, at the point where your trade idea is proved wrong, not based on how much you’d like to buy.
4. Work out risk per share = entry − stop.
5. Quantity = rupee risk ÷ risk per share, rounded down.
6. Check the position value against your margin and your concentration cap.
7. Put the stop-loss order in straight after you enter.

Adjustments for real-world trading

Costs and slippage

Brokerage, STT, exchange fees, GST and stamp duty all add to every loss. A stop-loss order can also get filled below your price when the stock gaps down. Some traders keep rupee risk a touch under target, 0.9% instead of 1% for example, to leave room for all this.

Gaps

Positions held overnight can gap straight through your stop. If a stock has results or a big event coming up, go smaller or simply wait until it’s out of the way.

F&O lot sizes

Futures and options don’t come in fractional lots. If the risk on one lot is more than your rupee risk, the trade is too big for your account. Skip it.

Common mistakes

• Moving the stop to fit the size: it has to work the other way round.
• Sticking with starting capital forever: recalculate from current capital at regular intervals.
• Doubling up to win back losses: there’s no quicker way into a deep drawdown.
• Ignoring correlation: several similar trades behave like one large trade.
• Not placing the stop-loss order: the sizing only protects you if the stop actually gets executed.

Frequently asked questions

Is fixed fractional sizing the same as investing a fixed percentage?

No. Fixed fractional fixes the loss at the stop as a percentage of capital. How much you invest changes with the stop distance.

Does it work for long-term investing?

The idea of capping risk per position still applies, but long-term investors rarely use tight stops. They tend to manage risk through diversification and position limits instead.

How often should I update my capital figure?

Plenty of traders do it daily or weekly. What matters is doing it consistently.

Key takeaways

• Fixed fractional position sizing risks the same small fraction of current capital on every trade.
• Quantity = (capital × risk %) ÷ (entry − stop).
• Wider stops give smaller positions, so volatility takes care of itself.
• At 1-2% risk, even a long losing streak leaves most of your capital standing.
• Small drawdowns are far easier to climb out of than big ones.

For the wider picture, read our pillar guide on risk management in trading and our explainer on SEBI’s intraday margin rules.

This article is for educational purposes only and is not investment advice.