Compound Interest Calculator
Calculate compound interest growth with monthly, quarterly, half-yearly, or annual compounding.
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Year-wise Growth
Year-wise breakdown of investment growth
Compound interest is the foundation of long-term wealth creation. Whether you are investing in FDs, mutual funds, PPF, or any other instrument, understanding how compounding works is critical. Plan your investments with the SIP calculator or compare returns with the FD calculator.
Compounding Frequency Comparison — ₹1,00,000 at 10% for 10 Years
| Compounding | Times per Year | Final Amount | Total Interest | Extra vs Annual |
|---|---|---|---|---|
| Annual | 1 | ₹2,59,374 | ₹1,59,374 | — |
| Half-Yearly | 2 | ₹2,65,330 | ₹1,65,330 | ₹5,956 |
| Quarterly | 4 | ₹2,70,383 | ₹1,70,383 | ₹11,009 |
| Monthly | 12 | ₹2,70,704 | ₹1,70,704 | ₹11,330 |
| Daily | 365 | ₹2,71,823 | ₹1,71,823 | ₹12,449 |
Monthly compounding gives marginally higher returns than quarterly. The biggest jump is from annual to half-yearly compounding.
The Power of Compounding Over Time
| Investment Period | ₹1L at 8% | ₹1L at 10% | ₹1L at 12% | ₹1L at 15% |
|---|---|---|---|---|
| 5 years | ₹1,46,933 | ₹1,64,454 | ₹1,84,894 | ₹2,11,388 |
| 10 years | ₹2,19,112 | ₹2,70,704 | ₹3,36,950 | ₹4,44,832 |
| 15 years | ₹3,32,267 | ₹4,49,641 | ₹6,22,597 | ₹9,42,314 |
| 20 years | ₹5,05,709 | ₹7,53,571 | ₹11,62,532 | ₹20,31,839 |
| 30 years | ₹11,83,053 | ₹21,23,411 | ₹40,86,793 | ₹94,15,279 |
Notice how the gap widens dramatically over longer periods. At 30 years, 15% returns produce nearly 8× more than 8% returns. Time is the most powerful factor in compounding.
Tips to Maximize Compounding Returns
Start Investing Early
A person who starts investing ₹10,000/month at age 25 will accumulate significantly more than someone who starts at 35 — even if the 35-year-old invests more each month.
Choose Higher Compounding Frequency
Monthly compounding yields 3-7% more than annual compounding over 10 years. Look for instruments that compound monthly (like SWP plans or monthly-income FDs).
Reinvest All Returns
Withdrawing interest interrupts compounding. Always reinvest interest/dividends to keep the compounding machine running. This is what makes mutual fund SIPs so powerful.
Use the Rule of 72
Divide 72 by your annual return rate to estimate how many years it takes to double your money. At 10%: 72/10 = 7.2 years. At 12%: 72/12 = 6 years.
How to Calculate Compound Interest
In plain words
Compound interest is interest earned on both the initial principal and the accumulated interest from previous periods. Albert Einstein famously called it the "eighth wonder of the world." The more frequently interest compounds, the faster your money grows. This is why starting early and letting your investments compound over decades creates exponential wealth.
A = P × (1 + r/n)^(n × t)
CI = A - P
Where:
A = Final Amount
P = Principal
r = Annual Interest Rate (as decimal)
n = Compounding Frequency per Year
Annual = 1, Half-Yearly = 2, Quarterly = 4, Monthly = 12
t = Time in YearsA quick example
Let us see the power of compounding with different frequencies:
Step by step
- 1.Monthly rate = 10% / 12 = 0.8333% = 0.008333
- 2.Total compounding periods = 12 × 10 = 120
- 3.Apply formula: A = 1,00,000 × (1 + 0.008333)^120
- 4.A = 1,00,000 × (1.008333)^120
- 5.A = 1,00,000 × 2.7070
- 6.Total Interest = 2,70,704 - 1,00,000
So the answer is: Monthly Compounding: ₹2,70,704 | Quarterly: ₹2,70,383 | Annually: ₹2,59,374 | Extra with monthly: ₹11,330