How much would my options portfolio lose if implied volatility dropped across all my positions?

How this is calculated

• Vega estimates the dollar change in an option's price for a 1 percentage-point change in implied volatility, holding the stock price, time to expiration, and the other Greeks constant.
• Long option positions carry positive vega and lose value when implied volatility drops. Short option positions carry the opposite exposure and gain value when implied volatility drops. This tool nets both directions across every position you log.
• One standard equity option contract represents 100 shares unless otherwise specified, so per-contract dollar vega equals vega-per-share multiplied by 100.
• This isolates the vega effect only. In practice, a sharp IV move, like the drop after an earnings report, often happens alongside a price move, so your actual profit or loss will include delta, gamma, and theta effects too, not vega alone.
• This tracker only exists in your browser tab for this session and resets when you close or reload the page.