Tools home / Calculator tools CALCULATOR · EVERYDAY HELPERS
Calculator tools Small everyday calculations that run entirely in your browser. No account, no backend, and no input data uploaded.
Local only · instant results Unit converter Length, mass, area, volume, temperature, speed, and data size. Percentage calculator Ratios, percent-of, increases, decreases, changes, and discounts. Date calculator Days between dates, business days, and adding or subtracting dates. Taiwan workday & leave-day calculator Count leave days with the 2026–2027 government-office calendar, plus custom days off and make-up workdays. Age calculator Years, months, days, total elapsed days, and the next birthday. Live clock & countdown Seconds and milliseconds, target-time countdown, fullscreen, and screen wake lock. Pomodoro timer 25 / 5 focus rhythm, custom sessions, rounds, and an alert sound when time is up. Time-zone converter IANA time-zone conversion with DST and day-change handling. Number to words Traditional Chinese and English readings for large decimal numbers. Privacy and calculation limits All nine calculators run locally. Dates, birth dates, numbers, zones, timer settings, and results are not uploaded or written to Analytics. Each tool explains its own mathematical or browser limits.