How to know how much is the amount in my pf account?

This can be checked at the below link by selecting the PF office and entering your PF account number:

https://www.epfindia.com/MembBal.html

New service has been launched by the EPF organization with effect from 01.07.2011 where subscribers of EPF have been provided facility to check their balances online any time through the link provided by Mr. Sanjeev. The same is reproduced below also:

https://www.epfindia.com/MembBal.html

The https://www.epfindia.com/MembBal.html link will only give member balance till the last updated year by the EPFO.As of today for Bangalore details updated only till 31-3-2010 is  available.

Email to RTI officer will not elicit any reply from him.A formal RTI with hardcopy and PO of Rs 10 sent by registered post with AD or Speed post with POD will only get you information from him.   

Learned experts/members have given their valuable advice. Kindly follow it.

Kindly decide on your requirement, last balance or exhaustive detail of deposit of employees and employer's contribution, accrued interest and final balance.

PF accumulation reports are issued by concerned PF office to employer, and employer is duty bound to supply it to the employee. If the employee has all the PF accumulation reports in his file, these should suffice. If the employer has not supplied these employee is within rights to demand and obtain these from employer.

Employee can apply thru RTI route and shall get the details. You can approach the o/o Post Master General in your location and submit RTI application thru them, who shall send the application thru redg. post, without any cost to you, and shall issue the receipt of fee paid by you. Thus you shall be able to save some cost.