Why do the Call and Put option show the same IV in FYERS?
In the FYERS Option Chain, the Implied Volatility (IV) shown for a Call option (CE) and Put option (PE) may appear identical for the same strike price and expiry.
This happens because FYERS displays one IV value for each strike and expiry combination. The value is derived from the Out-of-the-Money (OTM) option and shown on both the CE and PE sides for consistency.
IV display in Option Chain
- FYERS uses a single IV value for the same strike price and expiry.
- The IV is taken from the OTM option, as it generally reflects more reliable pricing.
- The corresponding futures price is used as the reference price.
- The calculated IV is displayed on both the CE and PE sides.
Example:
If the NIFTY 24,600 CE and 24,600 PE both show an IV of 11.62. This means FYERS has applied the same OTM-derived IV value to both option types for that strike and expiry.
What If...
| Scenario | Solution |
|---|---|
| Both CE and PE are illiquid | IV may remain blank or may not update until reliable OTM quotes are available. |
| Underlying price moves sharply | The OTM side may change, and IV may update based on the applicable OTM option. |
| Separate CE and PE IVs are expected | FYERS shows one IV for the same strike and expiry to keep the Option Chain consistent. |
| IV changes during market hours | IV may change as live option prices update. |
Last updated: 30 July 2026