How it works
Each year's contribution is 12% of basic pay from you plus 3.67% from your employer, and interest is credited on the running balance at the close of the year. Contributions arrive monthly, so they earn half a year's interest in the year they are made rather than a full year.
The employer split is the part most calculators get wrong. Your employer pays 12% of basic, but 8.33% of that is diverted to the Employees' Pension Scheme and never appears in your PF balance. Crediting the full 24% combined would overstate a twenty-five-year corpus by around a third.
More detail
Basic pay is grown each year by the increment you set, so every future contribution is larger than the last. This is what makes an EPF projection so sensitive to pay growth — a 10% increment rather than 5% roughly doubles the final contribution.
The balance shown is the provident fund alone. The 8.33% going to the pension scheme builds a separate entitlement, which is a defined pension rather than a corpus and is not projected here.
For the market-linked pension alternative, see the NPS calculator.
To check whether the corpus is enough to retire on, use the FIRE calculator.
To see what that balance will actually buy, try the inflation calculator.