Taxa Anual → Mensal
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
equivalência
About this calculator
The annual to monthly interest rate calculator is a tool to convert annual interest rates to monthly. It is a useful tool for those who need to calculate interest rates for loans, credit cards or investments.
The calculation is done with the equivalence formula, which is (1 + i_a)^(1/12) − 1, where i_a is the annual interest rate. This formula is used to convert the annual rate to a monthly rate, considering that there are 12 months in a year.
It is essential to use this calculator when you need to convert interest rates between different periods. This is especially useful for those who need to compare interest rates of loans or investments with monthly rates.
Frequently asked questions
How do I use this calculator?
Just enter the annual interest rate and click 'Calculate' to get the equivalent monthly rate.
What is the equivalence formula?
The equivalence formula is used to convert interest rates between different periods. It is (1 + i_a)^(1/12) − 1, where i_a is the annual interest rate.
Can I use this calculator to calculate interest rates for loans or investments?
Yes, this calculator is useful for converting interest rates between different periods, including loans and investments.
What happens if I enter a negative interest rate?
If you enter a negative interest rate, the calculator will return a negative monthly rate. This may indicate that the loan or investment has negative interest rates, which is common in some cases.