Interest Calculator

Monthly simple vs compound interest projection with optional monthly deposits and a detailed breakdown table.

Inputs

Results update automatically as you change values.

Amount

Commas appear as you type.

Monthly deposit

Added to the balance every month.

Rate

Years Months

Enter 12 for 12% per year.

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Duration

Years Months

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Compound interest

If off, interest is based on the original amount.

Enter values to see the breakdown.

Months Years

Opening: — Total gained: — Monthly deposit: — Final: —

Month	Opening balance	Gained	Monthly deposit	Closing balance
Enter values to see the breakdown.

Note: In non-compound mode, interest is computed from the original amount, but the closing balance still increases each month.