Date Calculators
High-precision tools for calculating intervals, milestones, and specific dates.
Reverse Due Date Calculator
Calculate estimated conception dates and pregnancy milestones based on your due date or last period.
Open CalculatorPregnancy Due Date Calculator
Estimate your expected due date (EDD), current gestational age, and track critical timeline milestones.
Open CalculatorOvulation Date Calculator
Find your peak fertile window, predicted ovulation dates, and prospective due dates for the next 6 cycles.
Open CalculatorAge Calculator
Calculate your exact age in years, months, and days with total time breakdowns.
Open CalculatorDate Difference
Calculate the exact number of days, weeks, and months between two dates.
Open CalculatorDays Between Dates
Calculate the exact number of days, weeks, and hours between two target dates.
Open CalculatorWeek Calculator
Calculate weeks between dates, add/subtract weeks, and find ISO or US week number details.
Open CalculatorMonth Calculator
Calculate months between dates, offset dates by months, and view month-specific characteristics.
Open CalculatorYear Calculator
Calculate years between dates, offset dates by years, and view leap year and zodiac details.
Open CalculatorLeap Year Calculator
Check leap years with detailed mathematical reasoning and calculate all leap years within custom ranges.
Open CalculatorDay of the Week Calculator
Find the day of the week for any date, inspect calendrical details, and calculate weekday occurrences.
Open CalculatorExact Age Calculator
Calculate chronological age by date of birth down to seconds, or calculate exact age differences.
Open CalculatorChronological Age Calculator
Calculate your precise chronological age in years, months, and days from your date of birth.
Open CalculatorBirthday Calculator
Calculate days until your next birthday, see future birth weekdays, and track lifetime milestones.
Open CalculatorHalf Birthday Calculator
Find your next half-birthday date, calculate countdowns, and track future half-birthday weekdays.
Open CalculatorAnniversary Calculator
Calculate countdowns to your next anniversary, track elapsed years, and explore traditional gift guides.
Open CalculatorAge Calculator by date of birth
Calculate your exact chronological age or compare the age difference between two people with accuracy.
Open CalculatorDate Plus Days
Add or subtract days, weeks, and months from any date with precision.
Open CalculatorSubtract Days from Date
Deduct days, weeks, months, or years from any custom starting date.
Open CalculatorBusiness Days Calculator
Calculate business/working days between dates, or add/subtract business days easily.
Open CalculatorWorking Days Calculator
Calculate custom working days between dates, exclude holidays, and offset start dates with custom weekend models.
Open CalculatorDays From Today
Calculate exactly how many days until a future date or since a past event.
Open CalculatorRetirement Date
Determine your exact retirement date based on age and track the remaining time.
Open CalculatorSchool Age Calculator
Calculate your child's grade level eligibility, age at cutoff, and view their complete K-12 academic pathway.
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