Compound Interest Calculator

See how savings grow with compounding and regular contributions.

Compound Interest Calculator

Fast online calculation engine

Amount / Value 1

Rate / Percentage / Value 2

Tenure / Value 3

Output Result100010

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What does Compound Interest Calculator do?

Project the growth of a lump sum with any compounding frequency, plus optional regular deposits. A year-by-year table shows the balance, the contributions and how much of the total is interest earned on interest.

How to Use Compound Interest Calculator

1
Enter the starting amountYour initial deposit, or zero if starting fresh.
2
Set rate and durationThe annual interest rate and how many years it runs.
3
Choose compounding frequencyMore frequent compounding grows slightly faster.
4
Add regular depositsOptional, but this is what makes the biggest difference.

Key Features

Annual, half-yearly, quarterly, monthly, weekly and daily compounding
Optional recurring contribution added each period
Year-by-year table separating contributions from interest earned
Effective annual rate shown so you can compare offers fairly
Rule of 72 estimate of how long the money takes to double

Frequently Asked Questions

What is the compound interest formula?

A = P(1 + r/n)^(nt), where P is the principal, r the annual rate as a decimal, n the compounding periods per year and t the years. Regular deposits add PMT × (((1 + r/n)^(nt) − 1) ÷ (r/n)).

Does daily compounding make much difference?

Less than most people expect. At 6% a year, annual compounding gives 6.00% effective, monthly gives 6.17% and daily gives 6.18%. The rate and the time you stay invested matter far more than the frequency.

What is the rule of 72?

Divide 72 by the annual rate to estimate the doubling time. At 8% money doubles in roughly 9 years. It is an approximation that works well for rates between about 4% and 15%.

Does this account for inflation or tax?

No. The result is a nominal figure. To think in real terms, subtract your expected inflation rate from the interest rate before calculating — that gives you purchasing power rather than currency units.

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