Calculate interest: amount, annual rate and days. Indicative result.
The calculator uses simple interest: amount × annual rate × (days / 365). You can use the statutory rate (default = NBP reference rate + 3.5 p.p.) or enter a contractual rate (e.g. from the agreement). The result is indicative; for arrears and contracts see the Civil Code and the agreement.
Statutory interest (Art. 481² KC) = NBP reference rate + 3.5 p.p. The rate may change — check NBP.
As of: 2026-02-01
As of: 2026-02-01
Legal information
Calculations are for information and estimation only. They do not constitute legal, tax or other professional advice. For individual matters, consultation with a lawyer, tax adviser or other specialist is recommended.
Legal basis
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Zakup i sprzedaz nieruchomosci, umowy deweloperskie, najem, spory o nieruchomosci.
Choose a law firm for your case
Compare firms by specialization, city, and ratings. You contact the selected firm directly.
Kancelaria Alfa
Sprawy rodzinne i cywilne: rozwod, alimenty, podzial majatku, reprezentacja w sadzie.
Lex Biz Kancelaria
Obsluga JDG i spolek: umowy, podatki, kontrole, sprawy pracownicze.
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Zakup i sprzedaz nieruchomosci, umowy deweloperskie, najem, spory o nieruchomosci.
Tax Guard
Doradztwo podatkowe i legal support dla biznesu: VAT, CIT, kontrole, umowy B2B.
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Spory cywilne, dochodzenie roszczen, umowy i sprawy mieszkaniowe.
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Prawo rodzinne i pracownicze, w tym sprawy cudzoziemcow pracujacych w Polsce.