Tempo pelo Montante
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
tempo
About this calculator
The time by amount calculator is a useful tool to calculate the time needed to reach a certain amount with compound interest.
It uses the formula n = log(M/P)/log(1+i), where M is the desired amount, P is the principal (or initial investment), and i is the interest rate.
This calculator is ideal for people who want to know how long it will take for their investment to reach a certain value, considering the applied interest rate.
Please note that this calculator assumes the application of compound interest, i.e., the interest is calculated on the updated amount.
Frequently asked questions
What is the interest rate?
The interest rate is the percentage charged on the updated amount. For example, if the interest rate is 5%, the interest will be calculated on the amount updated with that 5% rate.
I entered a negative value for the interest rate. What does it mean?
A negative value for the interest rate indicates that you are paying interest, i.e., you are borrowing money instead of investing. This can happen in some cases, such as personal loans or mortgage loans.
I entered a zero value for the interest rate. What does it mean?
A zero value for the interest rate indicates that no interest is being calculated. This can happen in cases where the investment does not generate interest, such as savings accounts or checking accounts.
Why is the calculator not working correctly?
If the calculator is not working correctly, it's possible that you entered an invalid value for the amount, the principal, or the interest rate. Check if the values are correct and try again.