How much value will my options lose over the weekend from theta decay?
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Your Result
Fill in the fields on the left and click Estimate to see the projected decay while the market is closed.
How this is calculated
Estimated decay equals your daily theta per share, multiplied by 100, multiplied by your number of contracts, multiplied by the number of calendar days the market is closed.
This treats your quoted theta as constant across every non-trading day, which is a simplification. In practice, many brokers already front-load some of the weekend's expected decay into Friday's theta figure, and theta itself shifts as the stock price, implied volatility, and time to expiration change.
Theta is a modeled estimate, not a guaranteed cost. The option's actual price on Monday depends on where the stock is trading and where implied volatility sits at that moment, not just the passage of time.
This calculator is for a single leg. For multi-leg positions like spreads or condors, run each leg separately since long and short legs decay in opposite directions.
Risk & liability disclaimer: This calculator produces a modeled estimate based on the inputs you provide, treating theta as constant, which it is not in live markets. It is not financial advice and does not guarantee any specific decay amount or trading outcome. Trading Habits is not a broker-dealer, registered investment adviser, or tax professional, and is not affiliated with any broker, exchange, or data provider. Always verify results independently and consult a licensed professional before making any trading or financial decision. You could lose some or all of the capital you trade with.
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