This Compound Interest Calculator estimates how an initial amount may grow when interest is added to the balance at regular intervals. You can compare annual, half-yearly, quarterly, monthly and daily compounding assumptions. Enter the principal, annual rate and time period to calculate an illustrative future value.
How to use the Compound Interest Calculator
- Enter the initial principal in rupees.
- Enter the annual interest rate as a percentage.
- Enter the time period in years.
- Select how often interest is compounded.
- Select Calculate to view the estimated total value and interest earned.
Compound interest formula
A = P × (1 + r/n)n × t
A is the final amount, P is the initial principal, r is the annual interest rate expressed as a decimal, n is the number of compounding periods per year, and t is the time in years. The calculator uses the nominal annual rate divided by the selected compounding frequency.
Worked example
Suppose ₹1,00,000 earns an assumed annual rate of 8%, compounded quarterly, for 5 years. The estimate is ₹1,00,000 × (1 + 0.08/4)20, or approximately ₹1,48,594.74. The estimated interest earned is approximately ₹48,594.74.
Why compounding frequency matters
When the nominal annual rate is the same and interest is positive, more frequent compounding generally produces a slightly higher mathematical result. Actual bank deposits, loans and investments may use different conventions, day-count methods, payout schedules, taxes or fees.
Frequently asked questions
What is the difference between simple and compound interest?
Simple interest is calculated on the original principal. Compound interest is calculated on the principal plus previously added interest.
Can I calculate with a zero interest rate?
Yes. With a zero rate, the final amount equals the initial principal.
Does this predict a bank or investment return?
No. It is a mathematical illustration based on the values entered and does not represent an offer or guaranteed return.
Financial disclaimer: Results are estimates only and may not include tax, fees, changing rates or product-specific terms. Check the applicable product documents before making a financial decision.