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Compound interest calculator

See how savings grow with compounding and regular monthly deposits.

Balance after 10 years1,066,390.17
Money you put in
700,000.00
Interest earned
366,390.17
Effective yearly rate
7.229%

Formula A = P x (1 + r/n)^(n x t). Monthly additions are added at the end of each month.

Assumes a fixed rate. Real returns vary, and fees and taxes are not included.

How it works

  1. 1Enter the starting amount and an optional monthly deposit.
  2. 2Enter the yearly rate and the number of years.
  3. 3Choose how often interest is compounded.
  4. 4Read the final balance, what you paid in and the interest earned.

What the options do

Added every month
A deposit made at the end of each month.
Compounded
How often interest is added to the balance. More frequent compounding gives slightly more.
Effective yearly rate
The true yearly growth after compounding, higher than the stated rate when compounding is more than yearly.

Privacy

The numbers you enter are used in your browser only and are never sent to a server.

Questions people ask

What is compound interest?

Interest earned on both the original amount and the interest already added. Over long periods it grows much faster than simple interest.

What is the formula?

A = P x (1 + r/n)^(n x t) for a lump sum. With monthly deposits, the balance is rolled forward month by month, which is what this tool does.

Will my investment really earn this rate?

No rate is guaranteed. Savings accounts can change their rate, and investments rise and fall. Fees and inflation also reduce real growth. Treat this as an illustration.

Does it include tax or inflation?

No. Both reduce what you keep. Use a lower rate to approximate them.

Is a Bangladesh fixed deposit calculated like this?

Often yes, with quarterly compounding, but banks differ and may deduct tax at source. Use your bank's own terms for the exact figure.

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