Core Calculators

Compound Interest Calculator

Calculate compound growth on savings and investments

Investment details

₹
%
yrs

Maturity amount

₹0

How compound interest works

Interest is earned on both principal and accumulated interest. More frequent compounding yields slightly higher returns.

A = P × (1 + r/n)n×t
Why use it

Detailed features

Flexible frequency

Monthly, quarterly or yearly.

Interest earned

See growth over principal.

Standard formula

Same as FD/compound math.

On the go

Also in the Toolance app.

Understand the result

What the Compound Interest Calculator tells you

This calculator helps you see how interest-on-interest changes long-term growth. It turns a small set of inputs into a clear maturity value, then shows the supporting breakdown so you can understand what moved the answer.

Inputs to check

  • Principal: use a recent statement, quote or realistic assumption.
  • Annual rate: use a recent statement, quote or realistic assumption.
  • Time and frequency: use a recent statement, quote or realistic assumption.

Try three scenarios

Run a likely case, a conservative case and a better case. Change one input at a time so you can see which assumption matters most.

How to use this estimate in a real decision

Write down the values you entered and the date you checked them. Compare options using the same assumptions, then include any fee, tax, penalty or provider rule that sits outside the calculator. A mathematically precise answer can still be incomplete when the inputs are old or optimistic.

Treat the result as a planning range, not a quote, approval or guaranteed outcome. Recalculate whenever your rate, price, income, goal date or business cost changes.

Frequently asked questions

You earn or pay interest on the principal plus interest already added. Over time growth speeds up because each period builds on the last. FDs, mutual funds and long-term loans all involve compounding.
Bank FDs often compound quarterly. Savings accounts may compound daily or quarterly per bank policy. More frequent compounding slightly increases effective returns at the same stated rate.
Future value equals principal times one plus rate divided by compounding frequency, raised to power of frequency times years. Our calculator does this so you do not have to work it by hand.
Investing earlier gives compounding more time to work, even with smaller amounts. A one-time lump sum also grows, but regular SIPs spread risk and suit salaried investors.
Yes. On reducing balance loans you pay interest on outstanding principal, which falls each month. On delayed credit card bills, interest on interest can pile up quickly if you pay only the minimum.
For FDs, ask the bank for annual effective yield after compounding. The headline rate and effective return can differ when compounding is quarterly.
This shows math on the inputs you give. Real returns vary with taxes, fees and market risk. It is not personalised investment advice.
No. It runs free in your browser with unlimited tries and no account.