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Compound growth calculator

Explore how regular contributions could grow over time.

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EXPLORE YOUR NUMBERS

Compound growth

Explore how regular contributions could grow over time.

Example values are shown. Change them to explore your situation.

How this estimate works

Each month: balance × (1 + annual rate / 1200) + contribution. Repeat for years × 12 months.

Contributions arrive at month-end. Assumes constant nonnegative growth compounded monthly; excludes fees, taxes, inflation, and withdrawals. Actual returns vary and can be negative. The example rate is not a forecast.

BEFORE YOU BEGIN

Bring the right numbers.

Estimates are enough to explore. Keep every money amount in the same selected currency.

  1. 01

    A starting balance and planned monthly contribution.

  2. 02

    A hypothetical annual growth rate to explore.

  3. 03

    A whole-number time horizon in years.

MAKE THE RESULT USEFUL

What to look for.

Separate the money you contribute from hypothetical growth. Try different time horizons and rates, including zero, to see how strongly the assumption affects the result. A smooth projected balance does not describe real market fluctuations.

Discuss your next step with Matt

Your calculator inputs are not included in your inquiry.

TRY ANOTHER SCENARIO

Change one thing.
Notice the difference.

Try zero growth, then your chosen hypothetical rate, without changing contributions. This separates the effect of saving regularly from the effect of the growth assumption.

Return to your numbers

Changing inputs here does not send them to Matt or save them between visits.

A FEW THINGS YOU MAY BE WONDERING

Good questions.
Clear answers.

When are monthly contributions added?

At the end of each month, after that month’s assumed growth. A contribution therefore begins growing the following month.

Is the displayed growth a prediction?

No. The rate is a constant scenario you enter, not a forecast or guaranteed return. Actual returns vary and can be negative. This model excludes fees, taxes, inflation, and withdrawals.