Two traders take exactly the same twenty trades, with identical entries and exits. One finishes the year up 30%; the other is down 45% and has stopped trading. The only difference between them is how much they risked on each trade. Position sizing is not a detail of trading — for most people it is the whole difference between surviving and not.
Work backwards, always
- Capital × Risk %
- The rupees you accept losing on this idea. Fixed, decided in advance.
- Entry − Stop
- Risk per share, determined by where the idea is proven wrong
Example: ₹5,00,000 capital, 1% risk = ₹5,000 at stake. Entry ₹1,250, stop ₹1,190, so risk per share is ₹60. Quantity = 5,000 ÷ 60 = 83 shares. Position value ₹1,03,750 — about 21% of capital, but only 1% of capital genuinely at risk.
How much to risk
| Risk per trade | Losses to halve the account | Suitable for |
|---|---|---|
| 0.5% | Around 140 consecutive | Beginners, and anyone still testing a system |
| 1% | Around 70 | The standard for most professional discretionary traders |
| 2% | Around 35 | Experienced traders with a well-tested edge |
| 5% | Around 14 | Reckless. A normal losing streak becomes an account-ending event. |
| 10%+ | Around 7 | Not trading. This is a lottery ticket with extra steps. |
Thinking in R
Professionals stop thinking in rupees and start thinking in R — multiples of the amount risked. If you risk ₹5,000, then a trade that makes ₹15,000 is +3R and one that hits your stop is −1R. This does two things: it makes trades of different sizes directly comparable, and it removes the emotional weight of the rupee figure from the decision.
It also makes performance legible. "I am up ₹80,000" tells you little. "I am +16R over 45 trades, with an average win of 2.3R and average loss of 0.9R" tells you whether the process is working.
The asymmetry that makes all of this necessary
A 50% loss requires a 100% gain to recover. A 75% loss requires 300%. This is not a psychological claim, it is arithmetic — after a loss you compound from a smaller base. Everything about risk management follows from this single asymmetry.
A climber does not summit by being the fastest. She summits by managing oxygen so that she still has some at the top. Running out at 8,000 metres is not a setback to recover from — it ends the expedition, permanently, regardless of how skilled she was on the way up.
Capital is your oxygen. A trader with a brilliant strategy and no risk control will eventually hit a losing streak with an oversized position and have nothing left to trade with. Skill only matters if you are still in the game to use it.
You have ₹3,00,000 and risk 1% per trade. You want to buy at ₹640 with a stop at ₹592. How many shares?
Sabzi mein mirchi kitni tez hogi, yeh mirchi ke bhaav se tay nahi hota — kitni daali usse hota hai. Stock sahi hoga ya galat, yeh aapke haath mein nahi. Kitna paisa lagaya, yeh poora aapke haath mein hai. Isiliye sabse zaroori sawaal "kya khareedun" nahi, "kitna khareedun" hai.
- Decide the loss you accept first; quantity is arithmetic after that.
- Risk 1% or less per trade until you have a tested, proven system.
- Think in R multiples, not rupees — it makes trades comparable and decisions less emotional.
- Losses and gains are asymmetric because you compound from a smaller base.
- Never size by conviction. Conviction is a feeling, not an input.
Mark it done to track your progress through the curriculum.
Common questions
Short, direct answers to what people ask about this topic.
- position sizing meaning in trading
- Position sizing is deciding how many shares to buy by first fixing how much money you accept losing if the idea fails, then dividing that amount by the distance from your entry to your stop. It is the one input you fully control — you cannot control whether you are right, only what being wrong costs.
- how much gain is needed to recover a 50% loss
- A 100% gain. Losses and the gains that undo them are not symmetric, because after a loss you compound from a smaller base — a 75% fall needs a 300% rise merely to get back to where you started. This single piece of arithmetic is the reason position sizing exists at all.
- quantity equals capital multiplied by risk percent divided by
- The difference between your entry price and your stop price — the risk per share. Quantity = (Capital × Risk %) ÷ (Entry − Stop). You work backwards from the rupees you are willing to lose and let the arithmetic hand you the quantity, rather than starting from how many shares you can afford.
- what is an R multiple in trading
- An R multiple states a trade’s result as a number of units of the amount you risked on it: risk ₹5,000 and make ₹15,000 and that is a +3R trade, while hitting your stop is −1R. It makes trades of very different sizes directly comparable and strips the emotional weight out of the rupee figure.
- what is risk of ruin
- Risk of ruin is the probability that a run of losses reduces your capital to the point where you can no longer trade the strategy at all. It rises steeply with the percentage risked per trade, so a system that survives a losing streak comfortably at a small risk per trade can be destroyed by the same streak at a larger one.