Finance

Interest Calculator

Calculate simple and compound interest with year-wise growth table.

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Principal Amount

₹

₹1,000₹1,00,00,000

Annual Interest Rate

% p.a.

1% p.a.30% p.a.

Time Period

years

1 years30 years

Compounding Frequency

Maturity Amount

₹1,48,984.57

49.0% total gain over 5 years

Principal

₹1,00,000.00

Interest Earned

₹48,984.57

PrincipalInterest

67%33%

Compounded monthly (12×/year)

Year-wise Growth

Year	Opening Balance	Interest	Closing Balance
Year 1	₹1,00,000.00	₹8,299.95	₹1,08,299.95
Year 2	₹1,08,299.95	₹8,988.84	₹1,17,288.79
Year 3	₹1,17,288.79	₹9,734.91	₹1,27,023.71
Year 4	₹1,27,023.71	₹10,542.90	₹1,37,566.61
Year 5	₹1,37,566.61	₹11,417.96	₹1,48,984.57

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About this tool

How to use Interest Calculator

1Select Simple Interest or Compound Interest tab
2Enter the principal amount, annual interest rate, and time period
3For compound interest, also select the compounding frequency
4View total interest earned, maturity amount, and year-wise growth table

Frequently Asked Questions

What is the difference between simple and compound interest?

In simple interest (SI), interest is calculated only on the principal amount. In compound interest (CI), interest is calculated on the principal plus accumulated interest — meaning you earn interest on interest. CI grows faster over time.

What is the formula for compound interest?

A = P × (1 + r/n)^(nt), where P is principal, r is annual rate (decimal), n is compounding frequency per year, and t is time in years. The interest earned is A − P.

Which is better — monthly or quarterly compounding?

Monthly compounding gives slightly higher returns than quarterly, as interest is added more frequently. The difference is small for typical FD rates but compounds over longer periods.