This is a simple and very useful pf calculator app that lets you calculate your PF balance accumulated by the time you are planned to retire.

All you have to do is fill up few fields in the app as follows:
Existing PF Balance : Enter your exixting pf balance if any (if you donot have any pf balance, please enter 0)
Basic salary : Enter basic salary(for eg : 20000)
Employer contribution : Enter employer contribution to PF(In India generally 12%, of which 3.67% will be given to us in hard cash and the rest will be given as pension. So this needs to be entered as 3.67)
Employee contribution : Enter employee contribution to PF (In India, generally 12%)
Rate of interest : Enter rate of interest (eg : 8.5%)
Avg hike in salary/year : Enter the average hike you might get considering the total years you are planning to work(for eg : i get 5% hike for the next 20 years)
Current age : Enter your current age.
Retirement age : Enter your planned retirement age.

There you go!!
once all the details are filled, click on calculate PF to know the PF balance accumulated by the time you retire.