Interest calculator

Calculate what your savings grow to with compound or simple interest. Set the rate, the term, how often it compounds, and how much you add each period. The calculator shows the effective annual rate behind your nominal rate, prices what it’s worth to pay at the start of a period instead of the end, compares simple and compound on the same deposits, and provides a year-by-year schedule with optional tax and inflation.

Your money

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Starting amount $

$0$50k$100k$150k$250k+

Interest rate % a year The nominal rate, as advertised. Years yrs Up to 70. Compounded — Add each period $ Leave at 0 for a single deposit. Added How often you pay in. Paid in at the —

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The rate you are actually paid

One nominal rate becomes several real ones, depending only on how often it compounds.

Compounded	Effective rate	Your balance

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When you pay in changes the answer

Same deposits, same rate, same term — only the day of the month moves.

Deposits land	Ending balance	Difference

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Year by year

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Year	Paid in	Interest	Balance

Tax and inflation

Tax on interest % Taken from each period's interest as it is earned. Inflation % a year Shows what the ending balance would buy today.

Your money

The rate you are actually paid

When you pay in changes the answer

Simple against compound

Year by year

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