Date &amp; Time

100 Day Calculator

Find the exact date 100 days before or after any start date. Perfect for tracking presidential review periods, project milestones, executive onboarding plans, and MGNREGA work guarantees.

120 Day Calculator

Calculate the date 120 days before or after any start date for four-month planning, probation periods, visa stays, project milestones, and escrow deadlines.

180 Day Calculator

Calculate the date 180 days from any start date for visa tracking, probation periods, NRI tax status determination, and project planning deadlines.

30 Day Calculator

Find the exact date 30 days before or after any start date. Add or subtract days for billing cycles, habit tracking, rental notices, and deadline planning.

30 Minute Calculator

Calculate the end time 30 minutes or any duration from any start time. Free online 30-minute interval calculator for scheduling meetings, Pomodoro sessions, cooking timers, and workout planning.

Calculate the date 45 days from any start date for sprint planning, invoice payment terms, real estate contingencies, and goal tracking. Add or subtract 45 days with weekday display and shareable results.

6 Month Calculator

Calculate the date 6 months from any start date. Add or subtract months for CD maturity, FD interest, lease renewals, semiannual goals, and financial reporting

60 Day Calculator

Find the exact date 60 days before or after any start date for two-month planning, fitness programs, rental notices, visa tracking, and deadline management.

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8 Hour Shift Calculator

Calculate shift end times for 8-hour work shifts with optional break durations. Track paid hours, total time at work, and automatically handles overnight shifts crossing midnight.

90 Day Calculator

Find the exact date 90 days before or after any start date for quarterly planning, visa tracking, probation periods, seasonal goals, and Schengen compliance.

Add Days Calculator

Add or subtract days from any start date with this free calculator. Handles leap years and varying month lengths to compute accurate future or past dates.

Add Minutes Calculator

Add minutes to any start time with this free calculator. Enter a start time and minutes to add — handles hour and day overflow automatically for exact results.

Add Time Calculator

Add hours to any base time with this free online add time calculator. Enter a start time and the hours to add to get the resulting time, handling overflow past midnight and multiple days.

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Adding Hours

Add hours to any start time with this free online adding hours calculator. Enter a time and hours to add to get the resulting end time, ideal for scheduling.

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Adding Hours and Minutes Calculator

Add hours and minutes to any start time with this free calculator. Enter a base time and duration to add — handles minute overflow and multi-day scheduling.

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Anniversary

See how many days until your next anniversary with this free calculator. Enter your wedding or relationship date and get an exact countdown to the celebration.

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Battery Charge Time Calculator

Estimate how long it takes to fully charge any battery by capacity, current, state of charge, and battery chemistry. Free battery charging time calculator with SoC and type comparison charts.

BC to AD Converter

Convert any BC year to its corresponding AD year using the no-year-zero rule. Free online BC to AD converter for historical dating and genealogy research.

Birthday Countdown Calculator

Find out exactly how many days, weeks, and months remain until your next birthday. Free birthday countdown calculator with instant results and visual charts for any birth date.

Business Days Calculator

Count working days between two dates or add business days to any date with this free online calculator. Get accurate business day counts with charts, excluding weekends for precise project planning and deadline tracking.

Calendar Calculator

View a full calendar for any month and year with days of the week. See days in each month, first day of week, and a visual grid with today highlighted.

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Calendar Countdown Calculator

Calculate exact days between two dates. Free calendar countdown for events, deadlines, holidays, weddings, and vacations with visual charts and monthly breakdowns.

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Clock Duration Calculator

Calculate hours and minutes between two clock times with this free online calculator. Handles overnight periods for work shifts, events, and planning.

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Commute Cost Calculator

Plan your travel budget with this commute cost calculator. Compare driving vs public transit with fuel, parking, tolls, and wear costs and interactive charts.

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Count Hours Calculator

Count the exact hours and minutes between any two times with this free calculator. Handles overnight shifts and shows decimal hours, H:MM, and total minutes.

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Countdown Calculator

Count down the exact days until any event with this free online countdown calculator. Enter a start and target date to see days, weeks, and months remaining.

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Cycle Time Calculator

Measure the time to complete one cycle of any process from start to end. Analyze manufacturing workflows, operational efficiency, and throughput with breakdown charts.

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Date Countdown Calculator

Calculate the exact days, weeks, and months remaining between any two dates with this free countdown calculator. Track time until events, deadlines, and special occasions with breakdown charts.

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Date of Birth Calculator

Calculate estimated date of birth from age in years, months, and days with this free calculator. Enter age and as-of date for genealogy and historical research.

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Day Countdown Calculator

Count exact days, weeks, and months left until any target date. Track time remaining for events, deadlines, holidays, special occasions with instant results.

Day Counter

Count the exact number of days, weekdays, weekends, months, and years between any two dates with this free online day counter calculator for planning and tracking.

Day of the Year Calculator

Find the day number of any date from 1 to 365 or 366, plus days remaining in the year. This free day of the year calculator supports leap years automatically.

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Days Between Dates Calculator

Calculate the exact number of days between any two dates with instant results showing total days, hours, minutes, weekdays, weekends, and months for planning events, tracking deadlines, and managing projects across any date range with interactive charts.

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Days Old Calculator

Find out exactly how many days old you are by entering your birth date and an as-of date. See precise total days with breakdowns for years, months, and weeks.

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Days Until Calculator

Count the exact days until any target date showing total days, hours, weekdays, weekends, weeks, and months with breakdown charts for planning events.

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Days Until December Calculator

Count the exact days, weeks, and months until December 1. Free countdown calculator for holiday planning, event tracking, and end-of-year goals with charts.

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Days Until June Calculator

Count the exact days, weeks, and months until June 1. Free countdown calculator for summer planning, vacation prep, and end-of-school-year tracking with charts.

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Deadline Calculator

Calculate exact days remaining until any deadline with this free online deadline calculator. Track project due dates, assignment submissions, and time-sensitive tasks with breakdown charts and shareable links.

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Decimal Time Conversion Calculator

Convert HH.MM to decimal hours for payroll and billing. Both directions supported. See results in decimal hours, HH:MM, total minutes, and comparison chart.

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Drive Time Calculator

Calculate drive time from distance and average speed. Enter trip distance and speed in miles or km to get travel time, estimated arrival, and speed comparison charts.

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Elapsed Time Calculator

Calculate elapsed hours and minutes between any two times with this free calculator. See HH:MM, total minutes, decimal hours, and automatic overnight detection.

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Engine Hours to Miles Converter

Convert engine run time to distance with this free engine hours to miles converter. Enter hours and average speed in mph to get miles, kilometers, and visual charts.

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Every Second Calculator

See what happens each second worldwide. Enter any duration to discover births, deaths, Google searches, Coca-Cola consumption, and real-time global events.

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Expiration Date Calculator

Calculate expiration dates for food, cosmetics, and household products. Enter start date and shelf life in any unit to find the expiry date with remaining days.

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Half Birthday Calculator

Find your next half-birthday with this free calculator. Enter birth date to see upcoming birthday and half-birthday with days remaining and comparison chart.

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Hour Countdown Calculator

Calculate the exact hours between any two dates and times with this hour countdown calculator. Track time until deadlines, events, launches, and milestones.

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Hours Calculator

Quickly convert hours to days, minutes, seconds, weeks, and work days. Free online calculator with time breakdowns, readable duration, and interactive charts.

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Hours Between Two Times

Find out how many hours are between any two times with this free calculator. Handles overnight periods and shows decimal hours, H:MM format, and total minutes.

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Hours and Minutes Calculator

Convert between hours:minutes, decimal hours, and total minutes instantly. Free online hours and minutes converter with visual charts and breakdowns for work, study, and payroll.

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Hours to Decimal Converter

Free hours to decimal converter for payroll, billing, and time tracking. Converts clock time to decimal hours, minutes, seconds and back with visual charts.

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How Old Am I

Find your exact age in years, months, and days with this how old am I calculator. Enter date of birth and as-of date for precise age with breakdown charts.

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How Old Was I

Find your exact age on any past date. Enter birth date and target date to see precise age in years, months, and days with breakdown charts.

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Keystrokes Per Hour

Convert words per minute (WPM) to keystrokes per hour (KPH) instantly. Free typing speed converter for data entry, transcription, and job application speed assessments.

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Lead Time Calculator

Calculate lead time between order and delivery dates with business days and hours breakdown. Free online supply chain planning and logistics tracking tool.

Leap Year Calculator

Check if any year is a leap year using the Gregorian calendar rule. Free online leap year checker with interactive charts and divisibility analysis.

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Miles Per Year Calculator

Estimate yearly miles from daily distance and driving days. Free calculator with monthly and quarterly charts for commuters, fleet tracking, and insurance.

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Minute Calculator

Convert minutes to seconds, hours, days, weeks, months, and years instantly. Free online minute time converter with duration format and comparison charts.

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Minutes Between Two Times

Calculate the exact minutes between any two times with this free online calculator. Handles overnight periods automatically and displays results in total minutes, H:MM format, and seconds.

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Month Counter

Count the exact number of full calendar months between any two dates with remaining days, total days, weeks, and years breakdown. Free online month counter calculator for planning and tracking.

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Months Between Dates

Calculate the exact calendar months between any two dates for tracking subscriptions, project timelines, baby age, loan terms, and lease durations with charts.

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Moon Phase Calculator

Find the moon phase, illumination percentage, and next full moon for any date. Free online lunar phase calculator with visual moon display and illumination chart.

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Number of Days Calculator

Calculate days from today to any target date with days until or since, weeks, months, weekdays, and weekend breakdowns with interactive charts for planning.

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Palindrome Date Calculator

Discover if any date reads the same forwards and backwards in YYYYMMDD format. Find the next, previous, and upcoming palindrome dates with interactive charts.

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Pregnancy Countdown

Track your pregnancy with this pregnancy countdown calculator. Enter your LMP date to get your due date, current gestational age in weeks and days, trimester info, and days remaining with progress charts.

Reading Time Calculator

Calculate reading time from word count and reading speed. Get total hours and minutes with daily plans and comparison charts for effective schedule planning.

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Retirement Countdown Calculator

Plan your retirement with this free countdown calculator. Enter today and your target retirement date to see years, months, days, and hours remaining.

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Reverse Time Calculator

Find the mirror opposite of any time on a 24-hour clock. Enter HH:MM to compute the complementary time via 24-hour subtraction for scheduling and symmetry exploration.

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Sidereal Time Calculator

Calculate Greenwich Mean Sidereal Time (GMST) and Local Mean Sidereal Time (LMST) for any date and location. Free online sidereal time calculator for astronomy, telescope pointing, and celestial navigation.

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Slack Time Calculator

Calculate slack time between earliest start and latest finish times. Free online slack time calculator identifies buffer hours and minutes for project planning.

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Subtract Time Calculator

Subtract hours and minutes from any base time with this free calculator. Handles midnight wrapping automatically when subtracting time with interactive charts.

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Time Adder Calculator

Add two times together with this free online time adder calculator. Get the sum in HH:MM format with days overflow, total hours, minutes, and comparison charts.

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Time Between Dates Calculator

Find the exact years, months, and days between two dates with this free online duration calculator featuring charts, weekday breakdowns, and total hours.

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Time Card Calculator

Track weekly work hours with daily clock-in and clock-out times, breaks, and overtime. Get total hours, regular and overtime pay with charts for each day.

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Time Difference Calculator

Find the exact duration between any two clock times with this free time difference calculator. Get precise HH:MM:SS results, total minutes, and interactive charts.

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Time Duration Calculator

Calculate the exact time duration between any two clock times with this free online calculator. Get precise HH:MM results, total minutes, and visual comparison charts.

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Time In Between Calculator

Calculate the exact duration between any two date-time values with precise years, months, days, hours, minutes, and seconds. Free online time between calculator with compound duration display and interactive breakdown charts.

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Time to Decimal Calculator

Convert clock time from HH:MM:SS to decimal hours, minutes, and seconds instantly. Free time to decimal converter for payroll, billing, and project tracking.

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Time to Hours Conversion Calculator

Convert clock time in HH:MM:SS format to decimal hours instantly. Free time to hours converter for payroll, billing, project tracking, and time analysis with charts.

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Time Until Calculator

Calculate exact days, hours, minutes, and seconds until any future date. Free countdown tool with breakdown charts, total hours display, and shareable links.

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Vacation Countdown Calculator

Count down days, weeks, and months until your vacation. Enter your current date and trip date to see exactly how long until you travel with charts and sharing.

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Wedding Countdown Calculator

Count the exact days, weeks, and months until your wedding. Enter your dates to track ceremony countdown with detailed breakdowns, charts, and shareable links.

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Words Per Minute Calculator

Calculate your typing, speaking, or reading speed in words per minute. Enter words and time to get WPM with speed category, keystrokes per hour, and benchmark comparison chart.

Working Days Calculator

Calculate the exact number of working days between any two dates by excluding weekends. Free online business day counter for deadline and project planning.

Years Between Dates Calculator

Calculate the exact number of years between any two dates with our free online years between dates calculator. Get decimal years, total months, weeks, days, and hours for precise date difference analysis.

Anniversary Countdown Calculator

Count down the days, months, and milestone years until your anniversary. Enter your wedding or relationship date for a real-time celebration countdown.

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Retirement Date Estimator

Estimate your retirement date by entering your date of birth and target retirement age. See the exact date you will retire, plus years, months, and days remaining with a visual life timeline chart.

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Leap Year Checker

Check if any year is a leap year using the Gregorian calendar rule. Enter a year to see if it has 366 days, February 29, and detailed divisibility facts.

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Zodiac Sign Calculator

Find your zodiac sign by entering your date of birth. Discover astrological element, quality, ruling planet and personality traits with instant results.

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Pregnancy Week Calculator

Calculate your current pregnancy week, trimester, due date, conception date, and baby size comparison using LMP or due date. Free online pregnancy week tracker with progress chart.

Day of the Week Calculator — Find What Day Any Date Falls On

Find the day of the week for any date — past, present, or future. Enter a date to see if it falls on a Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday.

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Due Date Calculator — Find When Something Is Due

Calculate the exact due date from any start date and duration in days, weeks, or months. Free online due date calculator for project deadlines, task tracking, and event planning.

Time Calculator — Add and Subtract Time Durations

Add and subtract multiple time durations in hours, minutes, and seconds. Get total time in HH:MM:SS, decimal hours, total minutes, and interactive charts.

Chronological Age

Calculate your exact chronological age in years, months, and days from your date of birth. Free online age calculator with breakdowns in weeks, days, hours, minutes, and seconds plus interactive charts.

Korean Age Calculator

Convert your international age to Korean age instantly. Enter your birth year to find out how old you are in the Korean age system used in South Korea.

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Music Duration Calculator

Calculate the duration of any musical piece from time signature, tempo in BPM, and number of measures. Also supports reverse BPM calculation and staves duration for multi-staff scores.

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New Year's Countdown Calculator

Count down the exact days, hours, minutes, and weeks until New Year's Eve with this free online countdown calculator featuring visual charts and shareable results.

Date Calculations

16 calculators