APR Calculator
Estimate simple-interest earnings from principal, annual percentage rate and days held.
Results
Fill in the inputs and click Calculate.
- Interest
- –
- Principal + Interest
- –
Risk disclaimer
This calculator provides estimates for informational purposes only. Rates are set by platforms and markets and may change; principal risk exists.
What is APR?
APR advertises simple interest: Interest = Principal × Annual Rate × Days ÷ 365, with no reinvestment.
If interest is compounded (e.g. daily), the effective return is higher — that is the APY basis; use the compounding calculator for it.
How to use
- Enter the principal and annual rate in percent.
- Enter the number of days (default 365).
- Click Calculate to see interest and principal + interest.
Formula
- Interest = Principal × Annual Rate × Days ÷ 365
- Total = Principal + Interest
Example
10,000 principal at 5% for 365 days → interest 500, total 10,500.
For 30 days the interest is about 41.10.
FAQ
APR or APY — which is higher?
For the same nominal rate, APY (compounding) is higher, and more frequent compounding raises it further. This tool is the simple APR basis.
Which basis do staking/loans use?
Products often quote both. Match the basis you use to avoid overestimating earnings.