Everyday tools

Predict your next period, ovulation day and fertile window from your last period and cycle length

Set a target date and watch a live countdown in days, hours, minutes and seconds

See the current time in major cities worldwide, with time zone comparison and offsets

Count down to Chinese public, lunar and solar-term holidays

Convert a Gregorian date into the sexagenary year, month, day and hour pillars plus the zodiac animal

Calculate basal metabolic rate with Mifflin-St Jeor and Harris-Benedict, plus TDEE and macros

Calculate body mass index and compare it against WHO and Chinese standards

Build a chain of relatives and get the correct Chinese kinship term in both directions

Estimate body fat percentage from measurements and see lean body mass

Rate password strength, analyse the character mix, and estimate cracking time

Calculate monthly payments, total interest and full amortization schedules, comparing equal-payment and equal-principal loans

Calculate monthly salary withholding and annual tax, and compare the two ways of taxing a year-end bonus

Convert ten categories of units in one view: length, weight, area, volume, temperature, speed, time, storage, pressure and power

Spin a weighted wheel with custom options and remove winners between draws

Calculate exact age, lunar nominal age, zodiac, days lived and a birthday countdown

Project compound growth with contributions, compare effective rates, CAGR and the rule of 72, and solve for term, principal or rate

Convert between distance, time and pace, with split tables, negative-split plans and milestone times

Count workdays between dates, find the date N workdays away, and build monthly calendars with custom weekends and holidays