Free Position Size Calculator for Stocks, Forex, and Crypto
Position sizing is the single most important risk-management decision in every trade. Enter your account size, risk percentage, entry price, and stop-loss — this calculator returns the exact number of shares or units to trade so each loss costs the same fixed amount.
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How to use this calculator
Three inputs control your position size:
- Account size — total capital in the trading account.
- Risk per trade — percent of the account you're willing to lose on this trade. Most disciplined traders use 0.5%-2%.
- Entry and stop — the difference between them is your per-share risk.
Position size = (Account × Risk%) ÷ (Entry − Stop). The result is how many shares (or contracts/coins) you can trade so that if your stop is hit, you lose exactly the dollar amount you intended.
Example: $10,000 account, 1% risk = $100 risk. Entry $50, stop $48, so $2 per-share risk. Position size = $100 ÷ $2 = 50 shares.