Position size calculator
Calculate whole shares that fit your chosen loss budget at the stop price and your available cash. Optionally include estimated broker charges.
Your risk and prices
One NSE delivery buy order, then one sell at the entered stop price. Account size is treated as cash available for this position, with no leverage. Results update as you type.
Whole-share position size
100 shares. Modelled loss at stop before charges: ₹1,000.00.
- Risk budget
- ₹1,000.00
- Price loss per share at stop
- ₹10.00
- Position purchase value
- ₹50,000.00
- Cash needed before charges
- ₹50,000.00
- Charges included (no broker selected)
- ₹0.00
- Unused modelled risk budget
- ₹0.00
This assumes an exit exactly at your stop price. Gaps, slippage and an unfilled stop can increase actual loss. No leverage, portfolio-wide exposure, short selling, derivatives or future price prediction is modelled. AMC, account opening, subscriptions and financing are excluded. Calculations use unrounded values; money is displayed to paise, while stop distances below one paise keep four significant digits. Contract-note rounding may differ.
How to calculate position size
Risk budget = account size × your risk percentage ÷ 100. Price loss per share = entry − stop. Before charges, divide the budget by that price difference and round down to whole shares. Also cap the purchase at your available cash.
With a broker selected, find the largest whole-share quantity whose price loss plus one buy-and-sell delivery charge estimate fits the risk budget. Purchase value plus buy-side charges must fit the cash budget. Per-order minimums, caps and fixed sell DP are evaluated at that quantity.
Worked example
An account size of ₹1,00,000 and a 1% risk budget give ₹1,000. Entry ₹500 and stop ₹490 give a ₹10 price loss per share. ₹1,000 ÷ ₹10 = 100 shares before charges, costing ₹50,000. A selected broker’s charges reduce the shares that fit the same loss budget.
Method reference: Zerodha Varsity’s percentage-risk sizing explanation (new tab), read 10 October 2026. The default 1% is an example, not a recommended risk level. Enter cash actually available after other commitments. This tool does not place trades or stops.
Position size calculator FAQ
Multiply account size by your risk percentage and divide by 100 to get the risk budget. Divide that budget by entry price minus stop price, then round down to whole shares. This long-delivery calculator also caps the purchase at available cash; a selected broker adds estimated charges to both budget checks.
With a broker selected, price loss at the stop plus estimated NSE delivery buy-and-sell charges must fit the risk budget. Purchase value plus buy-side charges must also fit available cash. Per-order brokerage floors and caps, delivery sell DP, STT, exchange charges, SEBI charges, stamp duty and GST are evaluated for the selected quantity and plan.
Zero means one whole share would exceed the entered loss budget or available cash, including any selected broker charges. Fixed sell DP and minimum brokerage can matter for small budgets. The tool does not use fractional shares or assume borrowing to make the trade fit.
No. The estimate assumes the sell executes exactly at the entered stop. Gaps, slippage, liquidity and an unfilled stop can produce a larger loss. The calculator does not place an order or assess execution risk.
This version models an unleveraged long NSE equity-delivery position only. Account size is cash available for this position after other commitments. It does not model intraday leverage, short selling, futures, options, portfolio-wide exposure, subscriptions, AMC, account opening or financing.