Nominal Interest Rate Calculator
Convert an effective annual rate into the equivalent nominal rate and periodic rate for a given compounding frequency.
Your inputs
Results
Nominal annual rate
12%
- Rate per compounding period
- 1%
✓Exact calculation — rounded only for display
Inputs are never added to links for financial, salary or health calculators.
What this calculator does
Sometimes you know the effective yearly growth you want but need the nominal rate a monthly or quarterly product must quote. This tool reverses the EAR formula.
Formula and method
Worked example
Calculated by this tool with its default inputs:
Inputs
- Effective annual rate: 12.6825030132 %
- Compounding of the nominal rate: Monthly
Results
- Nominal annual rate: 12%
- Rate per compounding period: 1%
How to read the results
The periodic rate is what is actually applied each compounding period.
Assumptions and limitations
- Effective rates above about −99 % are accepted.
Financial results are estimates based on the inputs and assumptions shown. They are not financial advice; confirm figures with your lender, provider or a qualified adviser before making decisions.
Questions
Why is the nominal rate lower than the effective rate?
Because compounding adds growth on top of the nominal rate.
Methodology and verification
- Result type
- Exact mathematical calculation (rounded only for display)
- Formula version
- 1.0
- Automated verification
- 3 reference and validation test cases, checked against independently computed values. The site cannot be built if any of them fail.
- Editorial review
- Awaiting human editorial review. The explanation was drafted with AI assistance; the formula and examples are verified by the automated tests above.
Privacy
Everything you enter is calculated in this browser and is not sent to Numerith or anyone else. Because this calculator can involve personal financial or health details, your inputs are never added to share links or saved to history. Privacy policy