Calculate compound interest with different frequencies and compare how monthly, quarterly, or annual compounding impacts your final returns.
Compounding Frequency
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Compounding means your returns also earn returns. At 12% annual return, ₹1 lakh doesn't grow by ₹12,000 every year — it grows by moreeach year because the base grows. By year 10, you're earning ₹37,000 in a single year on an investment that started at just ₹1 lakh.
| Year | Opening Balance | Interest Earned | Closing Balance | Simple Interest (for comparison) |
|---|---|---|---|---|
| Year 1 | ₹1,00,000 | ₹12,000 | ₹1,12,000 | ₹1,12,000 |
| Year 3 | ₹1,25,440 | ₹15,053 | ₹1,40,493 | ₹1,36,000 |
| Year 5 | ₹1,57,352 | ₹18,882 | ₹1,76,234 | ₹1,60,000 |
| Year 10 | ₹2,47,596 | ₹29,712 | ₹3,10,585 | ₹2,20,000 |
| Year 15 | ₹4,47,358 | ₹53,683 | ₹5,47,357 | ₹2,80,000 |
| Year 20 | ₹8,64,629 | ₹1,03,756 | ₹9,64,629 | ₹3,40,000 |
| Year 30 | ₹2,99,599 | ₹35,952 | ₹29,95,992 | ₹4,60,000 |
Principal: ₹1,00,000, Rate: 12% p.a. annual compounding. Note the exponential gap between compound and simple interest by year 20–30 — this is the core reason long-term equity investing in India builds wealth so effectively.
More frequent compounding gives a higher effective annual yield. Banks quote FD rates as annual rates but compound quarterly — that's actually better than annual compounding at the same stated rate. The difference between monthly and daily compounding is negligible in practice.
| Compounding | Effective Annual Rate | Value After 10 Yrs | Extra Earnings |
|---|---|---|---|
| Annual | 8.00% | ₹2,15,892 | — |
| Semi-Annual | 8.16% | ₹2,19,112 | +₹3,220 |
| Quarterly | 8.24% | ₹2,20,804 | +₹4,912 |
| Monthly | 8.30% | ₹2,21,964 | +₹6,072 |
| Daily | 8.33% | ₹2,22,534 | +₹6,642 |
Takeaway: the rate itself matters far more than frequency. Moving from 8% to 10% annual compounding adds ₹59,000+ over 10 years — far more than switching from annual to daily compounding at the same rate (₹6,642 extra).
That’s ₹6,506 more than the lowest-yielding bank. Pick wisely.
| Bank | 1Y Rate | 5Y Rate | Your Maturityin 5 yrs | Senior Bonus | |
|---|---|---|---|---|---|
IDF IDFC First Bank BESTBest 5yr rate | 6.50% | 7.15% | ₹1.43 L | +0.5% | Open FD |
AU AU Small Finance BankHighest FD rate | 7.10% | 6.75% | ₹1.40 L | +0.5% | Open FD |
IND IndusInd BankOpen FD online in 5 mins | 6.75% | 6.65% | ₹1.39 L | +0.5% | Open FD |
ICI ICICI BankInstant redemption option | 6.55% | 6.45% | ₹1.38 L | +0.5% | Open FD |
KMB Kotak Mahindra BankOpen FD online instantly | 7.10% | 6.20% | ₹1.36 L | +0.5% | Open FD |
Rates are indicative for general public. Add 0.5% for senior citizens. Subject to change. Affiliate links — we may earn a commission at no cost to you.
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Compound interest is interest calculated on both the initial principal and the accumulated interest from previous periods. It's often called "interest on interest" and grows your wealth exponentially over time.
More frequent compounding gives higher returns. Monthly compounding at 10% gives ~10.47% effective annual rate, while annual compounding gives exactly 10%. The difference grows with time.
A = P × (1 + r/n)^(n×t), where P = principal, r = annual rate (decimal), n = compounding periods per year, t = years.
Rule of 72: divide 72 by the annual interest rate to find the years needed to double your money. At 8%: 9 years to double. At 12%: 6 years. At 6%: 12 years. This is a quick mental shortcut - the compounding calculator gives the exact figures for any rate.
For Rs 1 lakh at 8% over 10 years: Annual = Rs 2.159L, Quarterly = Rs 2.208L, Monthly = Rs 2.219L, Daily = Rs 2.225L. The difference is real but modest. The bigger impact is the interest rate itself and the investment duration - an extra 2% rate far outweighs daily vs monthly compounding.
All equity mutual funds, PPF, NSC, FDs, RDs, and NPS use compounding. PPF compounds annually at 7.1%. FDs compound quarterly for most banks. Mutual fund NAV compounds continuously as the fund reinvests gains. SIPs compound both the return on each unit and the frequency of new unit purchases.
On Rs 1 lakh for 10 years at 8%: Simple Interest earns Rs 80,000 (total Rs 1.8L). Compound Interest earns Rs 1,15,892 (total Rs 2.15L). That is Rs 35,892 more from compounding alone. The gap widens dramatically over 20-30 years, making compound instruments far superior for long-term wealth building.
Rule of 72: divide 72 by your annual return rate to get the approximate years to double your money. At 6% (PPF rate): 72/6 = 12 years to double. At 8% (FD rate): 9 years. At 12% (equity SIP): 6 years. At 15% (mid-cap funds): 4.8 years. This means Rs 1 lakh in an equity SIP at 12% becomes Rs 16 lakh in 24 years (four doublings), illustrating the exponential power of compounding.
Calculate the future value of a one-time lumpsum investment at an expected annual return rate.
Calculate simple interest earned on a principal amount at a given annual rate over a specified period.
Calculate Fixed Deposit maturity amount and interest earned for any compounding frequency and tenure.