Calculated from the sample figures using the displayed formula.
What is the how to calculate interest rate per month?
(Future value ÷ Present value)^(1 ÷ Periods) − 1This equation solves the constant periodic growth rate implied by a beginning value, ending value and number of equal periods.
What do the inputs mean?
- Present value
- The value entered for present value. Keep its period and units consistent with the other inputs.
- Future value
- The value entered for future value. Keep its period and units consistent with the other inputs.
- Number of equal periods
- The value entered for number of equal periods. Keep its period and units consistent with the other inputs.
How to calculate it step by step
- Define the decision.
Write down what the result will help you compare or decide. - Collect matching inputs.
Use figures from the same period and apply the definitions shown on this page. - Apply the formula.
(Future value ÷ Present value)^(1 ÷ Periods) − 1. - Check the units.
Confirm whether the result is a currency amount, percentage, number of periods or ratio. - Test a second case.
Change one assumption at a time to see what drives the result.
Worked example
Using the sample figures in the calculator, the result is 7.72%. Change one figure at a time and recalculate to see which assumption has the greatest effect. A spreadsheet should return the same result when it uses the same formula, units and timing.
When should you use how to calculate interest rate per month?
Use it when there are no interim deposits or withdrawals.
Limitations and common mistakes
Cash flows during the period require an IRR or cash-flow model instead.
Do not mix annual figures with monthly figures, ending balances with averages, or percentages with whole numbers. Record the definition used so another person can reproduce the result.
Frequently asked questions
What is how to calculate interest rate per month?
This equation solves the constant periodic growth rate implied by a beginning value, ending value and number of equal periods.
How should I use how to calculate interest rate per month?
Use the formula only after matching every input to the same period, unit and definition. Then compare the result with a worked example and the decision you are trying to make.
What is the most common mistake with how to calculate interest rate per month?
Cash flows during the period require an IRR or cash-flow model instead.
Can I calculate how to calculate interest rate per month in a spreadsheet?
Yes. Reproduce the displayed equation with separate cells for each input, keep percentages as decimals, and test the spreadsheet against the worked example before replacing the sample figures.
Sources and methodology
This page uses the Investor.gov Compound Interest Calculator for the underlying financial or reporting context. Spreadsheet-related behavior is checked against Microsoft’s financial-function documentation. Examples are illustrative and use the formula displayed on the page.