Options Variance Overview
Option prices contain a view of expected movement. A variance from option data calculator turns that view into a usable number. It does not need one single option. It uses many strikes across the chain. Calls and puts are read by strike. Out of the money quotes usually carry the strongest signal. The method then weights each premium by strike distance and strike level.
Why the Method Helps
Variance is useful because it measures squared return risk. Volatility is the square root of variance. Traders often discuss volatility, yet many option products settle from variance. This page shows both values. It also shows the forward level and the reference strike. Those details help users audit the result.
Inputs That Matter
Clean option data matters more than a long chain. Use mid prices when possible. A stale bid or ask can bend the estimate. The expiry must match the option rows. Rates should be entered as annual values. Dividend yield can be added when the forward price is not supplied. If you know the forward directly, enter it and override the spot based estimate.
Interpreting the Output
The annual variance is the main output. The annual volatility is easier to read. Daily and monthly volatility give quick context. A higher number suggests larger expected moves. It does not promise that moves will happen. It only reflects option market prices at the time of entry.
Practical Use
Use this calculator before comparing expiries. You can also test how wide strikes change the result. Add more liquid strikes for a smoother estimate. Remove broken quotes. Keep notes about the data source. Export the report when you need a record. The CSV file helps with spreadsheets. The PDF file helps with simple sharing.
Limitations
This is an analytical estimate, not trading advice. Option markets include spreads, skew, fees, and liquidity effects. The result can change quickly. Always compare it with your own risk process before making decisions. Keep each run consistent. Use the same calendar basis across comparisons. Check that calls and puts share the same expiration. Review deep strikes carefully. Small prices can still affect totals when strike spacing is wide. Save the exports with a clear market timestamp today.