Calculator
Polish statutory interest calculator
Calculate Polish statutory interest from an amount, annual rate and day count. Data is processed only in your browser, and the page explains the formula and limitations of the result.
Calculator
Enter data
The amount, applicable annual rate and days in one rate period. Fields marked with an asterisk are required.
How to use the calculator
- Enter the required data: the amount, applicable annual rate and days in one rate period.
- Check the values and select “Calculate”.
- Review the primary result and the detailed calculation components.
Calculation details
Formula and calculation method
Interest = amount due × annual percentage rate × days ÷ 365; periods with a rate change are calculated separately.
Worked example
For PLN 10,000, an 8% rate and 30 days, the unrounded estimate is about PLN 65.75.
Limitations
- The correct interest category, start date, leap years and legal rounding rules can alter the claim amount.
Sources
- Polish Ministry of Finance — statutory interest calculator
- Polish Justice Minister — 2026 statutory interest notice
Engine version: 1.0 · Last reviewed: 3 August 2026
Frequently asked questions
Is the entered data sent to a server?
No. The calculation runs locally in your browser and the values are not saved by default.
Is the result definitive?
Not always. The correct interest category, start date, leap years and legal rounding rules can alter the claim amount.