100-Day Calculator
Calculate the exact date 100 days from any start date. Find milestones, weekday, weekly breakdown, and monthly distribution.
Free Date Calculators
101 toolsDate arithmetic, age, countdown, and calendar tools. Browse our free date tools below — no sign-up required.
120-Day Calculator
Calculate the exact date 120 days from any start date. Get milestones, weekday info, and monthly breakdown for 120-day planning periods.
180-Day Calculator
Calculate the exact date 180 days from any start date. Find the half-year mark with milestones, weekly breakdown, and monthly distribution.
30-Day Calculator
Calculate the exact date 30 days from any start date. Find weekday, business days, milestones, and time breakdowns for monthly planning.
45-Day Calculator
Calculate the exact date 45 days from any start date. Get business day counts, milestones, and weekday breakdowns for 45-day deadlines.
6-Month Calculator
Calculate the exact date 6 months from any start date. Get total days, business days, weekly breakdown, and monthly distribution across the span.
60-Day Calculator
Calculate the exact date 60 days from any start date. Get business day counts, milestones, monthly breakdown, and weekday distribution for the full span.
8-Hour Shift Calculator
Calculate shift end times, work hours, break deductions, overtime pay, and weekly earnings for 8-hour and custom-length work shifts.
90-Day Calculator
Calculate the exact date 90 days from any start date. Get quarterly milestones, business days, weekly breakdown, and monthly distribution.
Add Minutes Calculator
Add or subtract minutes from any time. Convert minutes to hours, seconds, and decimal hours with AM/PM time results and duration comparisons.
Add or Subtract Days Calculator
Add or subtract any number of days from a date. Enter a start date and number of days to find the resulting date with full calendar accuracy.
Add Time Calculator
Add or subtract two time durations in hours, minutes, and seconds. Get results in multiple formats including decimal hours and total seconds.
Adding Hours and Minutes Calculator
Add hours and minutes to any clock time. Get results in AM/PM format with decimal hours, progress timeline, and day shift indicators.
Adding Hours Calculator
Add or subtract hours from any clock time. See result in AM/PM format with day shifts, repeating schedules, and unit conversions.
Age Calculator
Calculate exact age in years, months, and days from a birth date. Get your precise age breakdown including total months, weeks, days, and hours.
Age Difference Calculator
Calculate the exact age difference between two people in years, months, days, weeks, and hours from their birth dates.
Age in Days Calculator
Calculate your exact age in days from your birthdate. Enter your date of birth and a reference date to see how many days you have been alive.
Age in Hours Calculator
Calculate your exact age in hours from your date of birth. See milestones, progress through current year, and equivalent days, minutes, and seconds.
Age in Minutes Calculator
Calculate your exact age in minutes from your date of birth. See milestones, day progress, and equivalent hours, days, and seconds.
Age in Months Calculator
Calculate your exact age in months from your date of birth. See year breakdown, month progress, and equivalent weeks, days, and hours.
Age in Seconds Calculator
Calculate your exact age in seconds from your date and time of birth. See milestones, heartbeat estimates, and conversions to all time units.
Age in Weeks Calculator
Calculate your exact age in weeks from your date of birth. See life progress, weeks remaining, milestones, and a "Your Life in Weeks" visualization.
Age in Years Calculator
Calculate your exact age in years, months, and days from your date of birth. See decade milestones, birthday countdown, life progress, and fun facts.
Age to Birthday Calculator
Calculate how many days until your next birthday. See upcoming birthdays with day of week, countdown progress, and milestone ages.
Anniversary Calculator
Calculate how long you\'ve been together or employed. See years, months, days, traditional anniversary names, and upcoming milestone dates.
Appliance Wattage Calculator
Calculate electricity cost for any appliance based on wattage, usage hours, and rate. See daily, monthly, and yearly costs with comparison tables.
Battery Charge Time Calculator
Estimate how long it takes to charge a battery from any percentage. Supports phones, laptops, EVs, and power tools with efficiency accounting.
Birth Date from Death Date Calculator
Calculate a person\'s date of birth given their death date and age at death. Find birth day of week, zodiac sign, and total days lived.
Birth Year Calculator
Find a birth year from an entered age. See generation labels, decade context, life milestones, and notable events from the corresponding decade.
Birthday Calculator
Enter your birthday to see exact age, days until next birthday, zodiac signs, day of week born, and upcoming birthday table with 8 future dates.
Birthday Countdown Calculator
Count down the days, hours, and minutes until your next birthday. See fun countdown units, monthly progress, and the day of week your birthday falls on.
Business Days Between Dates Calculator
Count the number of business days (weekdays) between two dates. Excludes weekends automatically for accurate working day calculations.
Calendar Countdown Calculator
Count down to any calendar date — holidays, events, deadlines. See days, weeks, hours, workdays, and weekends remaining with visual progress bar.
Century & Millennium Calculator
Determine which century and millennium any year belongs to. Enter a year to find its century number, millennium, and era classification.
Chronological Age Calculator
Calculate exact chronological age in years, months, days, hours, minutes, and seconds. See life stage, decimal age, heartbeats, and breaths since birth.
Clay Shrinkage Calculator
Calculate clay shrinkage percentages for drying and firing stages. Plan wet dimensions for desired fired size with common clay type references.
Clock Duration Calculator
Calculate the exact duration between two clock times in hours, minutes, decimal hours, and quarter-hour blocks. Supports breaks and overnight shifts.
Cost per Minute Calculator
Calculate the cost per minute, per second, and per hour from any total cost and duration. Compare rates across services and time periods.
Count Hours Calculator
Count the total hours between two dates and times. Optionally exclude weekends, view weekday vs weekend split, and see monthly hour breakdowns.
Countdown Calculator
Count down to any future event or date. See days, hours, minutes, business days, milestone dates, and multiple time unit conversions at a glance.
Countdown to Retirement Calculator
Calculate the exact number of days, weeks, and months until your retirement date. Enter your retirement date and see a detailed countdown breakdown.
Data Usage Calculator
Estimate internet data consumption by speed and usage hours. Check against data caps, compare activity rates, and project daily, weekly, and monthly usage.
Date Calculator
Add or subtract days, weeks, months, and years from any date. See the result date with day of week, quarter, week number, and quick reference table.
Date Countdown Calculator
Count down the days until any future date. Enter a target date and reference date to see exactly how many days, weeks, and hours remain.
Date of Birth from Age Calculator
Estimate your date of birth from a known age in years, months, and days. Reverse-calculate an approximate birth date from any reference date.
Date to Date Calculator
Calculate the exact difference between two dates in days, weeks, months, years, business days, hours, and minutes with monthly distribution breakdown.
Day Countdown Calculator
Count the days until any event or holiday. See business days, weekend days, sleeps, monthly breakdown, and milestone markers from today to your target date.
Day Counter Calculator
Count total days between two dates with weekday distribution, monthly breakdown, business vs weekend days, and inclusive/exclusive end-date toggle.
Day of Week Calculator
Find the day of the week for any date using Zeller's congruence. Enter any year, month, and day to see whether it falls on a Monday, Friday, and so on.
Day of Year Calculator
Find the ordinal day number (1-366) for any date. Enter a date to see which day of the year it is and how many days remain in the year.
Days Between Dates Calculator
Calculate the exact number of days between two dates. Enter any two dates using year, month, and day to find the total days between them.
Days Old Calculator
Find out exactly how many days old you are from your birth date. See weeks, hours, minutes, heartbeats, zodiac sign, generation, and day milestones.
Days Until Calculator
Calculate exactly how many days remain until any future date with weekday breakdown, business days, and milestone tracking.
Days Until December Calculator
Count down the exact days, weeks, and hours until December 1st or any December date with holiday planning breakdowns.
Days Until June Calculator
Calculate exactly how many days remain until June 1st or any June date with summer planning breakdowns and event tracking.
Elapsed Time Calculator
Calculate the exact time elapsed between two dates and times with breakdowns in years, months, days, hours, minutes, and seconds.
Electricity Cost (Single Usage) Calculator
Calculate the electricity cost of running any appliance for a single session with wattage, duration, and rate inputs.
Engine Hours to Miles Converter
Convert engine hours to approximate miles driven based on vehicle type and average speed for maintenance scheduling.
Expiration Date Calculator
Calculate expiration dates for food, medicine, documents, and more by adding shelf life to a start date.
Fiscal Year & Quarter Calculator
Determine the fiscal year and quarter for any date based on your fiscal year start month. Supports any start month for custom fiscal calendars.
Fuel Mileage Calculator
Calculate your vehicle's fuel economy in MPG, cost per mile, and trip fuel costs with comparison charts and efficiency tips.
Garbage Bag Size Calculator
Determine the right garbage bag size for any trash can with volume calculations, common size charts, and cost comparisons.
Generator Wattage Calculator
Calculate the total wattage needed for your generator by adding up appliances with starting and running watts.
Holiday Date Finder
Find the exact date of moveable US holidays for any year. Calculate Thanksgiving, Memorial Day, Labor Day, Easter, and more using calendar rules.
Hour Countdown Calculator
Set an hour-based countdown timer to calculate exact end times, remaining minutes, and progress for any duration.
Hours Between Two Times Calculator
Calculate the exact hours and minutes between any two times with overnight support, break deduction, and payroll formatting.
Hours Calculator
Convert between hours, minutes, seconds, days, and weeks with decimal and fraction formats for timesheets and scheduling.
Hours to Decimal Calculator
Convert hours and minutes (HH:MM) to decimal format for timesheets, payroll, and billing with batch conversion support.
Julian Date Converter
Convert any Gregorian calendar date to a Julian Day Number and back. Enter a date to get the JDN, or enter a JDN to get the Gregorian date.
Keystrokes Per Hour Calculator
Calculate your typing speed in keystrokes per hour (KPH) from WPM, CPM, or timed tests for data entry job requirements.
Korean Age Calculator
Calculate your Korean age from your birthdate and compare it with international age using the traditional Korean counting system.
Leap Year Checker
Check if any year is a leap year using the Gregorian calendar rules. Enter a year to see whether it has 366 days or 365 days.
Lunar Age Calculator
Calculate your age in lunar years and months based on the lunar calendar cycle used in Chinese and other Eastern traditions.
Microwave Wattage Calculator
Convert microwave cooking times between different wattage levels and calculate energy cost for optimal heating results.
Minute Calculator
Convert minutes to hours, seconds, days, and other time units with a multi-entry adder for activity tracking and scheduling.
Minutes Between Two Times Calculator
Calculate the exact minutes between any two times with overnight support, visual breakdown, and common use case presets.
Month Counter Calculator
Count the exact months between two dates with day-level precision, business month tracking, and milestone calculations.
Months Between Dates Calculator
Calculate the number of full calendar months between two dates. Enter two dates and get the precise count of complete months between them.
Number of Days Calculator
Calculate the exact number of days between any two dates with business day, weekend, and holiday breakdowns.
Palindrome Date Calculator
Find palindrome dates that read the same forwards and backwards in multiple formats (MM/DD/YYYY, DD/MM/YYYY, YYYYMMDD).
Pregnancy Countdown Calculator
Track your pregnancy week by week with a due date countdown, trimester timeline, baby development milestones, and key appointment dates.
Pregnancy Due Date Calculator
Estimate a pregnancy due date using Naegele's Rule. Enter the first day of the last menstrual period to calculate the estimated delivery date.
Reverse Time Calculator
Subtract hours, minutes, and seconds from a time to work backwards and find start times from known end times.
Sidereal Time Calculator
Calculate local sidereal time (LST) and Greenwich sidereal time (GST) for astronomy, telescope alignment, and star observation planning.
Slack Time Calculator
Calculate slack (float) time in project schedules using task durations, dependencies, earliest/latest start and finish times.
Subtract Time Calculator
Subtract hours, minutes, and seconds from a time value to find the earlier time with date crossing and format conversion.
TikTok Time Alternatives Calculator
Calculate what you could accomplish in the time spent on TikTok or social media with productivity comparisons and goal tracking.
Time Adder Calculator
Add multiple time durations together for timesheets, exercise logs, project tracking, and payroll calculations.
Time Between Dates Calculator
Calculate the exact time between any two dates in years, months, days, hours, minutes, and seconds with multiple breakdown formats.
Time Calculator
Add, subtract, multiply, and convert time values with support for hours, minutes, seconds, and multiple output formats.
Time Difference Calculator
Calculate the exact difference between two clock times with overnight detection, break deduction, and multiple output formats.
Time In Between Calculator
Find the exact midpoint, third-points, and quarter-points between any two times for scheduling and planning.
Time to Hours Conversion Calculator
Convert time in hours, minutes, seconds to decimal hours, fractional hours, and payroll formats for billing and timesheets.
Time Until Calculator
Calculate the exact time remaining until any future event with countdown in years, months, days, hours, minutes, and seconds.
TV Series Duration Calculator
Calculate the total time to binge-watch any TV series based on episode count, length, and viewing schedule.
Vacation Countdown Calculator
Count down to your next vacation with days remaining, business days until you leave, packing timeline, and preparation milestones.
Wedding Countdown Calculator
Count down to your wedding day with detailed planning milestones, vendor deadlines, and a complete preparation timeline.
Week Calculator
Calculate week numbers, find dates by week, convert between ISO weeks and dates, and analyze weekly patterns.
Week Number Calculator
Find the ISO 8601 week number for any date. Enter a year, month, and day to see which week of the year it falls in.
Working Days Calculator
Calculate the number of business days between two dates, add or subtract working days, and account for custom holidays.
Years Between Dates Calculator
Calculate the exact number of full years between two dates. Get precise results with remaining months and days for any date pair.