Compound Interest Calculator
See how an initial deposit and regular contributions grow with compound interest — and how much of the result is your money versus interest.
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Projected future value
₹94,111
₹70,000 contributed · ₹24,111 from estimated interest
- Initial deposit
- ₹10,000
- Total contributions
- ₹60,000
- Estimated interest
- ₹24,111
- Effective annual rate
- 5.12%
Approximately ₹24,111 of the projected value comes from estimated interest — the rest is money you put in.
Monthly figures use an effective annual rate of 5.12% derived from the nominal rate and compounding frequency.
These estimates are for general planning only and are not financial, tax, investment or banking advice. Actual interest, fees, taxes, inflation and product terms may differ.
Loading charts…
Yearly growth schedule
| Year | Contributions | Interest | Balance |
|---|---|---|---|
| Year 1 | ₹6,000.00 | ₹651.05 | ₹16,651.05 |
| Year 2 | ₹6,000.00 | ₹991.33 | ₹23,642.37 |
| Year 3 | ₹6,000.00 | ₹1,349.02 | ₹30,991.39 |
| Year 4 | ₹6,000.00 | ₹1,725.01 | ₹38,716.40 |
| Year 5 | ₹6,000.00 | ₹2,120.23 | ₹46,836.63 |
| Year 6 | ₹6,000.00 | ₹2,535.68 | ₹55,372.31 |
| Year 7 | ₹6,000.00 | ₹2,972.38 | ₹64,344.69 |
| Year 8 | ₹6,000.00 | ₹3,431.42 | ₹73,776.11 |
| Year 9 | ₹6,000.00 | ₹3,913.95 | ₹83,690.06 |
| Year 10 | ₹6,000.00 | ₹4,421.17 | ₹94,111.23 |
Assumptions and conventions
- Per-period rate = (1 + effective annual rate)^(1/periods per year) − 1; contribution and compounding frequencies are converted exactly, never approximated.
- The interest rate stays constant for the whole duration.
- Fees are an annual percentage of the balance; tax reduces credited interest.
- The annual contribution increase applies every 12 months.
- Values are calculated at full precision and rounded for display; columns may differ from totals by a small rounding amount.
What this calculator does
Compound interest pays interest on previously earned interest, so growth accelerates over time. This calculator projects an initial deposit plus regular contributions at your assumed rate, and always separates the two honest components: money you contributed and interest the balance earned.
Compounding frequency matters less than most people expect, but it is not nothing: 6% compounded monthly is an effective 6.17% per year. The calculator converts frequencies exactly rather than approximating.
Formula
FV = PV·(1+r)ⁿ for the initial deposit and FV = PMT·((1+r)ⁿ − 1)/r for end-of-period contributions (× (1+r) for beginning-of-period), where r is the exact per-period rate derived from the effective annual rate. With 0% interest, FV = deposit + contributions.
Assumptions
- The interest rate is constant for the whole duration and is your assumption.
- Contribution and compounding frequencies are converted exactly via the effective annual rate.
- Fees are an annual percentage of the balance; tax reduces credited interest; both default to zero.
Content and formulas reviewed on 2026-08-06. See our methodology for how calculations are built and tested.
Worked example
10,000 initial plus 500 per month at 5% compounded monthly for 10 years: the deposit grows to about 16,470 and the contributions to about 77,641, for a projected 94,111 — of which 24,111 is estimated interest on 70,000 contributed.
Frequently asked questions
What is the difference between simple and compound interest?
Simple interest is paid only on the original amount; compound interest is also paid on accumulated interest. Over 10 years at 7%, simple interest grows 100 to 170 while compounding grows it to about 197.
Does more frequent compounding always help?
For the same nominal rate, yes, slightly — 6% compounded daily is an effective 6.18% versus 6.17% monthly. Between products, always compare effective annual rates, not nominal ones.
How do fees change the outcome?
An annual fee taken from the balance compounds against you exactly as interest compounds for you. Even 1% per year removes a surprisingly large slice over decades — enable the fee field to see it on your own numbers.
Is the interest here guaranteed?
No. The rate is an assumption you enter. Savings rates change and investment returns vary — the projection shows what would happen if the rate held.
Does this include inflation?
Optionally: set an inflation rate in the advanced options to see the balance in today's purchasing power alongside the nominal value.
These estimates are for general information only and are not financial, tax, legal, or investment advice. Rates, fees, and lending rules vary by lender and country. Actual costs and outcomes may differ from the projections shown.