Compound Interest Calculator
Calculate returns with monthly, quarterly, or yearly compounding
What is Compound Interest?
Compound interest is the interest calculated on the initial principal and also on the accumulated interest from previous periods. Albert Einstein reportedly called it the "eighth wonder of the world" because of its power to grow wealth exponentially over time.
The Compound Interest Formula
A = P(1 + r/n)^(nt)
- A = Final amount (principal + interest)
- P = Initial principal amount
- r = Annual interest rate (decimal)
- n = Number of times interest is compounded per year
- t = Number of years
Why Compounding Frequency Matters
The more frequently interest is compounded, the more you earn. For example, on a ₹1,00,000 investment at 8% for 10 years:
- Yearly compounding: ₹2,15,892
- Half-yearly: ₹2,19,112
- Quarterly: ₹2,20,804
- Monthly: ₹2,21,964
Monthly compounding gives you ₹6,072 more than yearly compounding!
The Power of Regular Contributions
Adding just ₹5,000 every month to your initial ₹1,00,000 investment at 8% for 10 years grows your corpus to ₹10,96,000 instead of ₹2,21,964. That's 5x more wealth just by adding small amounts regularly!
Inflation-Adjusted Returns
If inflation is 6% and your investment returns 8%, your real return is only 2%. This calculator shows you the inflation-adjusted value so you know the actual purchasing power of your money in the future.
What is the difference between simple and compound interest?
Simple interest is calculated only on the principal amount. Compound interest is calculated on principal + accumulated interest. Over time, compound interest grows much faster. For example, ₹1 lakh at 10% for 20 years: Simple interest = ₹3 lakh, Compound interest = ₹6.73 lakh.
Which is better: monthly or yearly compounding?
Monthly compounding is always better for investors because interest is calculated and added more frequently, leading to higher returns. However, the difference is small for short-term investments. For long-term (10+ years), monthly compounding can add significant wealth.
How does inflation affect my investment returns?
If your investment returns 8% but inflation is 6%, your real purchasing power only grows by 2%. This calculator shows inflation-adjusted values so you understand the true value of your money in the future. Always aim for returns that beat inflation by at least 2-3%.
Is compound interest taxable in India?
Yes, interest earned is taxable as per your income tax slab. However, certain investments like PPF, ELSS (under 80C), and long-term equity mutual funds (LTCG up to ₹1 lakh) have tax benefits. Always consult a tax advisor for your specific situation.
What is the Rule of 72?
The Rule of 72 is a quick way to estimate how long it takes to double your money. Divide 72 by the annual interest rate. For example, at 8% interest, your money doubles in 72/8 = 9 years. This works for compound interest calculations.
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