Calculators

Calculate compound interest with optional recurring contributions. Year-by-year breakdown table and balance growth chart.

Estimate annual paid leave entitlement by country (KR / JP / US / EU). Inputs are start date, jurisdiction, and (for JP) attendance rate.

Calculate exact age in years, months, and days. Includes Korean traditional age and next birthday countdown.

Estimate monthly take-home pay in South Korea. Subtracts the four-major social insurances (national pension, health, long-term care, employment) and the simplified income tax for 2026 brackets.

Estimate monthly take-home pay in Japan. Subtracts national income tax, resident tax, and the four-major social insurances (health, pension, employment, long-term care).

Create vector-PDF quotes, bills, and invoices for small businesses. Switch document type with one click, fill line items, and download a clean A4 PDF — Korean / Japanese / English templates with locale-aware tax (VAT 10%, 消費税 10%), currency, and business-number formats.