The table of the left uses what is known as an option straddle format - it shows call & put option contracts for the same strike price on the same line.

For both calls & puts, we show the current option premium, and the previous day's volume & open interest - with the strike price in the middle.

Cells in green indicate that the corresponding call/put contract is 'in the money'.

For calls, this is when the current price of the underlying stock/index is more than the strike price. For puts, this is when the current price of the underlying stock/index is less than the strike price.

Note that this table shows only the current/near month call & put option data. But even those are illiquid for most stocks in India.

In that case, the volume & OI cells remain blank. But we do provide outgoing link to the corresponding option page at NSE.

This table is most useful to quickly understand the relative amount of interest in call vs. put options, and the strike prices that seem to be most preferred.

In our experience, this data is especially useful towards F&O expiry, to estimate where the underlying stock/index is likely to move on F&O expiry day.

Each chart has 'current month' call option data on the left & put option data on the right. On both charts, the closing price of the underlying stock/index is shown in blue. Both charts have the same Y-axis scale.

If you move over your mouse on the blue line, the closing price of the underlying stock/index is displayed as a tip, like so:

Each major-tick on the Y-axis corresponds to the actual strike price of active call & put options.

To learn more about call & put options, strike prices and such, please read this NSE article and this detailed tutorial.

Usually, for each stock/index, there are several active option contracts at different strike prices. However, most of them are illiquid. At Moneyoga, we rank call & put option contracts by how liquid they are (in terms of open interest), and chart only the top-5 most active calls & puts. These strike prices are denoted as orange horizontal lines.

At each strike price, we plot the open interest (OI) as a vertical pink bar. Note that OI is the number of "open" call/put option contracts that have not expired, been exercised or physically delivered.

If you move your mouse over any pink OI bar, the OI as well as the Traded Volume of the call/put contract is displayed as a tip, like so:

Note that the OI bars on both the call & put charts are scaled by the maximum OI on any day across all contracts - this allows you to easily compare OI across all strike prices.

Finally, for each of the strike prices shown, we also plot the maximum OI across all days - show as "Max OI: xyz" on the right side.

Notice that in the sample chart on the left, as the underlying price went up over time, the OI shifted from lower strike prices (600, 620) to higher strike prices (660, 700) for call options.