No there are no virtual calculator provided for bitsat. It is the same as jee mains and advanced , you need to do all the calculation by your own. 

Go through this link to know all rules of bitsat:

https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.plancess.com/jee-mag/bitsat-2015-instructions-followed-examination/&ved=2ahUKEwja4eH495riAhVMWisKHfNfBD4QFjAPegQICBAB&usg=AOvVaw1jgUb4bvokjTtzB0pIzWa1

Hello Kaviya!
No, BITSAT doesn't provide any virtual calculator or calculator installed on PC.
Reason is that you won't need a calculator at all.
BITSAT doesn't test your arithmetic skills.
Questions are mostly tricky than lengthy.
There won't be any difficult calculations. Your logic is tested. Once you know what's to be done, you'll be able to solve a mathematics question within a minute.
You must be clear with your concepts.
Hope this helps :)
Best of luck!

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