Position sizer
Answer the only question that matters before buying: how many shares, given what you are prepared to lose if you are wrong.
Runs entirely in your browserRuns entirely on your device — nothing you type is sent anywhere. Educational only, and not investment advice.
How to use this calculator
Each step names a control you will find on screen above.
- Trading capital
The pot this trade comes out of. Use the real figure — sizing off a number that includes money you cannot deploy produces positions you cannot fund.
- Risk per trade
What percentage of that capital you accept losing on this one idea. 1% is the conventional starting point and there is nothing timid about it.
- Entry price and Stop-loss
The two prices. The gap between them is your risk per share, and it is what converts a percentage into a share count.
- Read the losing-streak row
The panel shows how many consecutive losses your setting survives. This is the part that changes minds — a 5% risk setting looks bold until you see what six losses in a row does to the account.
Worked example: The same ₹5 lakh account, a tighter stop
A stock at ₹450 with a clear level at ₹430 to put the stop under. Same ₹5 lakh capital, same 1% risk.
What to enter
- Trading capital
- ₹5,00,000
- Risk per trade
- 1%
- Entry price
- ₹450
- Stop-loss
- ₹430
What it shows you
- Rupees at risk
- ₹5,000
- Risk per share
- ₹20
- Quantity
- 250 shares
- Position value
- ₹1,12,500
- Losses survivable
- about 100 in a row
22.5% of capital
before the account halves
Where this is taught
A calculator gives you a number. These explain what the number means and when it misleads you.
- Technical Analysis12 minScaling in, pyramiding and partial exitsEntering and exiting in pieces changes your average price, your risk and your psychology. Which of those changes help, and which quietly turn a winner into a loser.
- Technical Analysis12 minSizing by volatility, not by rupeesEqual rupee positions carry unequal risk. Volatility-adjusted sizing makes every position contribute roughly the same amount, which is what you probably intended.
- Risk & Psychology11 minWhat changes when the amounts get largeThe same percentage feels entirely different at ₹5 lakh and ₹5 crore. Why people who traded well small often trade badly big, and how to grow into the size.
- Risk & Psychology11 minPosition sizing: the only thing you fully controlYou cannot control whether you are right. You can control exactly how much it costs to be wrong.
- Technical Analysis13 minThe position size you can actually takeThe sizing formula returns 2.1 shares. You cannot buy 2.1 shares, and the choice between two and three moves your risk on that trade by nearly half. Everything downstream of the sizing rule assumes a number the market does not sell.