Compound Interest Calculator

Estimate future value, total contributions, total interest earned, and inflation-adjusted value based on your starting amount, regular contributions, annual rate, time period, and compounding frequency.

Calculate Compound Interest

Future value combines growth on the starting balance with growth on recurring contributions over time using the selected compounding schedule.
Your result will appear here.

How the compound interest calculator works

Starting amount growth:
Your initial balance compounds at the selected annual rate and frequency.

Recurring contributions:
Regular deposits are added over time and also compound.

Total contributions:
The calculator separately tracks how much money you added yourself.

Inflation adjustment:
The future value can be translated into today’s dollars using the inflation rate entered.

Why compound interest matters

Compound interest helps show how earnings on savings or investments can generate additional earnings over time. It is one of the most useful concepts for long-term financial planning.

This tool is most helpful when comparing different contribution amounts, rates, and time horizons.

What your result means

Your result shows projected future value, total contributions, total interest earned, and inflation-adjusted value based on the assumptions entered.

Compound interest calculator tips

Frequently asked questions

What is compound interest?

Compound interest means earnings are generated not only on the original amount, but also on prior earnings over time.

Why do regular contributions matter so much?

Because each new contribution also gets time to compound, which can materially increase long-term growth.

What does inflation-adjusted value mean?

It shows what the future balance may be worth in today’s dollars after accounting for inflation.

Is this guaranteed investment growth?

No. This is only an estimate based on the rate and assumptions you enter.