Calculator
Position size calculator
Position sizing controls how much of your account is at risk on any single trade. This calculator returns the share count that keeps loss to a defined percentage of the account.
Updated July 2026
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%
$
$
Shares to buy
100
Dollar risk
$500
Position value
$10,000
How it works
Shares = (Account × Risk%) / (Entry − Stop)
- Enter account size and the percentage you're willing to risk per trade (typically 0.5–2%).
- Enter entry price and stop-loss price.
- The calculator returns share count and total dollar risk.
Worked examples
- $50,000 account, 1% risk, entry $100, stop $95 → 100 shares, $500 risk.
- Same trade with stop at $90 → 50 shares, $500 risk (wider stop, smaller size).
Frequently asked questions
How much should I risk per trade?
Most disciplined traders risk 0.5–2% of account per trade. Above 2% and a normal losing streak can seriously damage the account.
Does this replace fundamentals?
No — position sizing controls damage from being wrong. It doesn't tell you what to trade or when.
Related
Educational information only. Not personalised financial advice. Consult a qualified professional for decisions specific to your situation.