About AbacusKit

AbacusKit is a free set of calculators for everyday money and work questions: working days and holidays, bridge days, VAT, wages, ages and dates. The site is available in English and German, and country rules are chosen separately from the language.

What we care about

• Accuracy over speed. Each calculator is tested against official sources or hand-derived values, cross-checked, and documented in a verification report. Read how we calculate.
• Fast and light. Pages are static, load quickly and work on a phone first.
• Private by default. Your inputs stay in your browser. There are no accounts and no sign-up.

Independence

AbacusKit is an independent project. It is not affiliated with any government, tax authority or financial institution, and its results are not advice.