Count days, ages and everyday costs
Free calculators that run in your browser. Try a countdown:
Upcoming
- Days until HalloweenSaturday, October 31, 2026
- Days until Veterans DayWednesday, November 11, 2026
- Days until Thanksgiving (US)Thursday, November 26, 2026
- Days until Black FridayFriday, November 27, 2026
- Days until Cyber MondayMonday, November 30, 2026
- Days until Christmas EveThursday, December 24, 2026
Tools
- Days until any dateCountdown in days and weeks
- Date difference calculatorDays, weeks and months between two dates
- Add or subtract daysDate N days from any date
- Age calculatorExact age and next birthday
- Day of the week finderWhat day was any date
- Business days calculatorWeekdays between dates
- Time card calculatorHours worked with breaks
- Week numberISO week of any date
- Days left in the yearYear progress
- Half birthday calculator6 months after your birthday
- Sleep calculatorBedtimes by sleep cycles
- Dog age calculatorDog years to human years
- Cat age calculatorCat years to human years
- Overtime calculatorTime-and-a-half pay
- Unix timestamp converterEpoch time ↔ date
- Military time converter24-hour ↔ 12-hour
- Electricity cost calculatorCost to run any device
- Hourly to salary calculatorHourly ↔ annual pay