Theta Query and option price calculator

After close of trading today, Sensibull option chain in Zerodha is showing LTP of BNF 37000 CE as 48 and theta is shown as 30. So if everything remains same, 37000CE price will be 18 at tomorrow mkt opening or at mkt closing?

Also, 37500CE LTP is 8.8 and theta given as 11! How can Theta be more than price?

Is option price calculator available on Zerodha?

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@Sensibull can you.