Compound Interest Calculator
Visualize how compound interest grows your investment year by year.
Parameters
1,00,000
8%
10 Yrs
Compounding Frequency
Final Amount
$221,964
Total Invested
$100,000
Total Interest
$121,964
About Compound Interest Calculator
Harness the exponential power of compounding. Visualize how your investment grows year by year and understand the true impact of compounding frequency on your wealth.
The Eighth Wonder of the World
Albert Einstein reportedly called compound interest the "eighth wonder of the world", saying: "He who understands it, earns it; he who doesn't, pays it." Compound interest is the foundational mechanism behind all long-term wealth creation — it turns modest, consistent savings into extraordinary wealth through the geometric multiplication of returns over time.
The key insight is that your returns generate returns. With simple interest on ₹1,00,000 at 10%, you earn ₹10,000 every year. With compound interest, you earn ₹10,000 in year one, but ₹11,000 in year two (10% on ₹1,10,000), and so on — accelerating exponentially.
Compounding Frequency and Effective Annual Rate
The compounding frequency determines how often interest is added to your principal within a year. Common frequencies include:
- Annual (1×/year): Interest added once at year-end. Simplest but least powerful.
- Semi-Annual (2×/year): Interest added every 6 months. Common for bonds.
- Quarterly (4×/year): Interest added every 3 months. Common for fixed deposits.
- Monthly (12×/year): Most common for savings accounts and mutual funds.
- Daily (365×/year): Maximum practical compounding frequency.
The Effective Annual Rate (EAR) = (1 + r/n)ⁿ − 1 tells you the true annual return accounting for compounding. A 12% rate compounded monthly yields an EAR of ~12.68%, meaningfully higher than 12% compounded annually.
The Compound Effect
by Darren Hardy
How small, consistent actions multiply into extraordinary results — the compound effect in life and money.
Get the BookQuestions & Answers
How much will ₹1 lakh grow in 10 years at 8% compound interest?
₹1 lakh grows to approximately ₹2.16 lakh in 10 years at 8% annual compound interest — more than double. With monthly compounding, it grows slightly more to ₹2.22 lakh due to the higher effective annual rate of 8.3%. Simple interest at 8% would give only ₹1.8 lakh over the same period, showing why compounding is so powerful.
How often should I compound to maximize returns?
More frequent compounding gives higher effective returns. Monthly compounding provides the highest yield among common options, followed by quarterly, half-yearly, and annual. For example, at 7% annual rate: yearly compounding gives 7% EAR, quarterly gives ~7.19% EAR, and monthly gives ~7.23% EAR. The difference is modest, but over 20+ years it adds up meaningfully.
What is the Rule of 72?
Divide 72 by your annual return rate to find roughly how many years your money takes to double. At 8% annual return, your money doubles in about 9 years (72 ÷ 8). At 12%, it doubles in just 6 years. This simple rule shows why higher returns over long periods dramatically accelerate wealth — a 12% return is not just 50% better than 8%, it doubles your money three years sooner.