Finance tool
Monthly Interest Calculator
Calculate simple interest for a loan or deposit using amount, annual rate, and time.
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How To Use Monthly Interest Calculator
Quick notes to help you understand the result before you act on it.
Overview
Use this monthly interest calculator for short-term interest estimates.
Enter time as a fraction of years, such as 0.5 for six months.
Interest Formula
- Simple interest = principal x rate x time / 100.
- Total amount = principal + interest.
Practical Tips
- Use 1/12 or 0.0833 for one month.
- Confirm whether your lender compounds interest.
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FAQ
Common questions about this tool.
How do I enter one month?
Enter about 0.0833 years.
Does this compound monthly?
No. It uses simple interest.