Free Tool

Options Position Size Calculator

Enter your account size, risk tolerance, entry price, and stop price. We'll calculate exactly how many contracts to buy so a stopped-out trade never costs more than you intended to risk.

ACCOUNT SIZE ($)

RISK PER TRADE (%)

RISK IN DOLLARS

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ENTRY PRICE ($)

STOP PRICE ($)

Fill in all fields to see your position size.

HOW THIS IS CALCULATED

Risk in dollars = Account size × Risk %

Contracts = Risk in dollars ÷ ((Entry − Stop) × 100)

Want this calculated automatically for every setup?

Ridgewell runs this math on every ticker it scans, alongside 14 other validated filters.