Trading Position Size Calculator

Work out how many shares to buy so each trade risks only a set part of your capital. Enter capital, risk %, entry and stop loss.

Quick answer

₹5 lakh capital, 1% risk, ₹250 entry, ₹240 SL: 500 shares.

How it is calculated

Maximum loss = capital × risk % = 5,00,000 × 1% = 5,000.
Risk per share = entry − stop loss = 10.
Quantity = 5,000 ÷ 10 = 500 shares.

Worked example

With ₹5,00,000 capital and 1% risk per trade, buying at ₹250 with a ₹240 stop loss: take 500 shares, needing ₹1,25,000, with a maximum loss of ₹5,000 if the stop is hit.

Example values
Capital	₹5,00,000
Risk per trade	1 %
Entry price	₹250
Stop loss	₹240

Result
Quantity	500 shares
Capital needed	₹1,25,000
Max loss	₹5,000

Formula

q = floor(Cap×Rk/100/abs(En-Sl))
Quantity = q
Capital needed = q×En
Max loss = q×abs(En-Sl)

Good to know

Brokerage, taxes and gap openings can make the real loss bigger.
This is not investment advice, only a risk calculation.

Questions people ask

Why does position size matter?

So that one bad trade cannot take a big part of your capital.

What is the 1% rule?

Never lose more than 1% of total capital on one trade.

Does it work for short selling?

Yes, put the stop loss above the entry; the gap is used as a positive value.

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Updated 13 Nov 2026 · Desktop N Calculator v1.2.0