Position Size Calculator
position-size• Get the number of shares to buy from account size, risk %, entry, and stop-loss. • A money-management tool that caps your loss per trade at a fixed share of the account.
Total balance in your trading account
Share of the account you can lose on one trade (usually 1–2%)
Position size
200 shares
What is position sizing?
Position sizing is a money-management method: instead of "how much to buy", you fix the amount you lose if the stop is hit to a set share of your account. The risk amount is divided by the per-share risk (the gap between entry and stop) to get the quantity.
Formula: shares = (account × risk %) ÷ per-share risk. Per-share risk is the difference between entry and stop. Example: account 10,000, risk 1% (100), entry 100, stop 95 → per-share risk 5 → 20 shares. The quantity is rounded down so you never exceed your risk.
Keeping risk at 1–2% means a losing streak will not shake your account much. Longs and shorts are calculated the same way (absolute difference). Fees and slippage are not included — this is a theoretical figure.