How much does compounding frequency really matter?

The difference between annual and monthly compounding at the same rate is small over short periods but grows visibly over 15 to 20 years.

What is the rule of 72?

Divide 72 by the annual return to get the years required to double your money. At 8 percent, that is nine years; at 12 percent, six years.

Are bank FDs compounded?

Most cumulative FDs compound quarterly. Non-cumulative options pay interest periodically without reinvestment.

Does this account for tax?

No. Interest from FDs, debt funds, and similar instruments is taxable. Use the post-tax rate for a realistic future value.

Compound interest calculator

Compounding is the engine behind every long-term wealth plan. This tool shows the future value of a lump sum at any rate, term, and compounding frequency so you can compare instruments on a like-for-like basis.

Compound interest calculator

See how compounding frequency supercharges your returns over time.

Principal (₹)

₹1.0 L

Annual interest rate (%)

Duration (years)

10 yrs

Compounding frequency

Maturity value

₹2.2 L

Compound interest

₹1.2 L

Simple interest

₹80,000

Compounding bonus

+₹35,892

extra vs simple interest

A = P × (1 + r/n)^(nt). For insurance-linked investment plans like ULIPs and guaranteed return plans, returns are typically declared as IRR — use the SIP calculator for those.

How this is calculated

Inputs you provide: principal amount, annual interest rate, tenure in years, and compounding frequency.
Standard formula: A = P x (1 + r/n)^(n x t).
Higher compounding frequency raises the final amount slightly because interest is added more often.
Total interest earned is the future value minus the original principal.
For periodic deposits rather than a single lump sum, use the SIP or PPF calculators instead.

Common questions

How much does compounding frequency really matter?: The difference between annual and monthly compounding at the same rate is small over short periods but grows visibly over 15 to 20 years.
What is the rule of 72?: Divide 72 by the annual return to get the years required to double your money. At 8 percent, that is nine years; at 12 percent, six years.
Are bank FDs compounded?: Most cumulative FDs compound quarterly. Non-cumulative options pay interest periodically without reinvestment.
Does this account for tax?: No. Interest from FDs, debt funds, and similar instruments is taxable. Use the post-tax rate for a realistic future value.