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Compound Interest Calculator
Compound growth of a principal with optional regular contributions and any compounding frequency.
SavingsInputs
Results
Formula
- A = P × (1 + r/n)^(n·t)
- With contributions: A = P(1 + i)^N + PMT × [((1 + i)^N − 1) / i]
- i = r/12/100 for monthly contributions, N = 12t
- Compound interest = A − P − total contributions
Compounding pays interest on previously earned interest, so growth is exponential rather than linear. When regular contributions are added, the balance is the sum of two terms: the original principal compounding on its own, plus the future value of the contribution annuity.
Step-by-step Calculation
- 1.Periodic rate
8% / 120.6667% - 2.Principal growth
P(1 + r/n)^(n·t)₹221,964 - 3.Contribution growth
no contributions₹0 - 4.Final amount
sum of both₹221,964
Assumptions
- • Rate is constant
- • Contributions occur at the end of each month
- • No tax or fees deducted
Money Tips
- ◆Frequency matters less than rate and time — doubling the horizon beats doubling the frequency.
- ◆Compare products using the effective annual rate.
Warnings
- ▲Advertised 'compounded daily' rates are usually nominal; convert to effective before comparing.
References & Standards
Standard compound interest formulaEffective annual rate convention
Results are planning estimates generated in your browser. Nothing you enter is uploaded or stored. Verify material decisions with your lender, adviser or chartered accountant.