Convert interest rates between monthly, annual and daily.
An interest rate quoted as "12% per year" is not the same as "1% per month" — compound interest makes the monthly equivalent slightly less than simple division. This tool does the conversion correctly using the compound formula (1 + r)^n − 1.
It handles three periods: daily, monthly and annual. Enter any one and the other two are calculated instantly in your browser, with no rounding shortcuts.
The result is useful when comparing loan offers quoted in different periods, or when converting a CDI annual rate to the monthly rate an investment actually earns.
(1 + i_annual) = (1 + i_monthly)^12. General form: (1 + i_a) = (1 + i_b)^(a/b), where a and b are the period lengths.
No. Everything runs locally in JavaScript on your device — nothing is transmitted or stored.
No. This is an educational tool for estimates only. Real financial decisions depend on fees, taxes and personal circumstances — consult a qualified professional.
The tool uses the latest publicly available rates and tables. You can verify the values against the official sources linked on the page.
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