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Position Sizing
What is position sizing?
Position sizing is the process of deciding how large a trade should be relative to the trader’s account size and risk tolerance.
Example:
If one credit spread has a max risk of $400, trading one contract risks $400. Trading ten contracts risks $4,000 before commissions and fees.
Why does position size matter?
Position size determines how much a trade can affect the account. A good trade idea can still become a bad account decision if the position is too large.
Example:
A $400 risk may be reasonable for one account but too large for another. The same trade can have very different risk depending on account size.
How can traders calculate risk before entering a spread?
For a credit spread, traders can estimate risk by subtracting the credit received from the spread width.
Example:
A $10-wide spread opened for a $2.00 credit has an estimated max risk of $8.00, or $800 per contract before commissions and fees.
What happens when a trader increases contract size?
Increasing contract size multiplies both potential profit and potential loss.
Example:
One spread with $400 max risk equals $400 of risk. Five spreads with the same structure equal $2,000 of risk.
Why should beginners start smaller?
Smaller position sizes give traders more room to learn without allowing one mistake to cause major damage. Trading experience often comes from seeing how positions behave in real market conditions.
Example:
A trader learning credit spreads may start with one contract to understand price movement, spread behavior, and emotional pressure before increasing size.
Key takeaway
Position sizing connects strategy to account survival. Understanding max risk per contract and total risk across all contracts is essential.