Count the exact number of business days and calendar days between two dates, or find the deadline for a contract obligation.
Add or extract VAT at any rate (22% Russia 2026, 20%, 18%, 10%...), with the amount in words (Russian) for invoices.
Convert spreadsheet CSV data to JSON array and JSON to CSV with auto delimiter detection.
Live and offline multi-currency calculator for CBR fiat, USDT, TON, BTC, ETH, SOL with 1-click Telegram deep link.
Five common calculations: percent of a number, what percent, percentage change, add and subtract percent.
Annuity and declining-balance payments, total interest and a full monthly schedule with CSV export.
Sale price, stacked discounts, tip amount and splitting the bill between people.
Many legal systems and contracts use the same rule: if the last day of a period falls on a non-working day (a weekend or public holiday), the deadline moves to the next working day — for example, Article 193 of the Russian Civil Code and Rule 6(a) of the US Federal Rules of Civil Procedure. This calculator lets you instantly check a deadline while skipping Saturdays and Sundays; always check public holidays and the exact wording of your contract separately.
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