See what time can do to your money

Compound Interest Calculator

Project a lump sum and monthly contributions with compound growth, including total contributions and investment gains.

Your result

From inputs to outcome

Final balance264,122
Total contributed130,000
Investment gain134,122

Currency-neutral calculators use the same unit throughout. Results are estimates based on the assumptions shown below.

Formula, assumptions and FAQ
Method

The formula

FV = P(1 + r)ⁿ + PMT × {[(1 + r)ⁿ − 1] ÷ r}

Calculations run in your browser. Displayed values are rounded, while intermediate calculations keep their full precision.

Scope

What this estimate assumes

  • The annual return is divided into 12 monthly periods.
  • Contributions are made at the end of each month.
  • Taxes, fees, inflation and market volatility are excluded.
Example

A quick reality check

US$500 a month for 20 years

At 6% a year, the projected balance is about US$231,020.

FAQ

Common questions

Is the return guaranteed?

No. The rate is a planning assumption, not a forecast or guarantee.