From counting hours between shifts to finding exactly how many days until a deadline, this collection covers it all. The Time Duration Calculator, Date Duration Calculator, and Hours and Minutes Calculator handle the most common tasks, while the Time to Decimal Calculator and Minutes to Hours Calculator fill in the gaps.
Check the most-popular list or open the Trending tab to see what other visitors are timing. All tools are free, require no account, and work on any device.
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Weekly Time Card CalculatorAdd up your weekly work hours from daily clock-in/clock-out times and breaks. Handles overnight shifts and splits regular vs overtime hours over 40.
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Average Speed from Time and Distance CalculatorCalculate average speed from distance and time. Enter distance in km, miles, or meters plus hours, minutes, and seconds to get km/h, mph, and m/s.
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Minutes Per Mile to MPH CalculatorConvert your running or walking pace in minutes per mile to speed in miles per hour (mph). Enter minutes and seconds to get instant mph and km/h.
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Decimal Hours to HH:MM CalculatorConvert decimal hours to hours and minutes (HH:MM) instantly. Enter a value like 2.75 to get 2h 45m. Free, accurate decimal time converter.
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Time Between Now and Future Date CalculatorCalculate the exact time between now and a future date and time — total days, hours, minutes and seconds plus a clean day/hour/minute/second breakdown.
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Pregnancy Weeks to Months CalculatorConvert weeks pregnant to months instantly. Enter your gestational age in weeks to see how many months pregnant you are, using 4.34524 weeks per month.
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Weeks From Today CalculatorFind the exact date N weeks from today (or before today). Enter a number of weeks to get the target date, weekday, and total day offset instantly.
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Milliseconds to Seconds CalculatorConvert milliseconds to seconds instantly. Enter any value in ms and get the equivalent seconds using seconds = milliseconds ÷ 1000.
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Ovulation Date CalculatorEstimate your ovulation day and fertile window from the first day of your last period and your average cycle length. Free, fast, and easy to use.
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30 Days From Today CalculatorFind out what date is 30 days from today (or any number of days). Get the exact future date and weekday instantly with this free date calculator.
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Years to Months CalculatorConvert years into months instantly. Enter any number of years and this free calculator returns the equivalent number of months (years × 12).
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Months From Today CalculatorFind the exact date a set number of months from today (or before today). Add or subtract calendar months with automatic month-end day clamping.
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Months to Days CalculatorConvert months to days instantly. Uses the average month length of 30.4375 days for accurate, year-aware results. Free online months-to-days calculator.
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Road Trip Time CalculatorEstimate total road trip time from distance, average speed, and rest stops. Adds driving time plus break time for a realistic arrival estimate.
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Year Progress CalculatorFind out what percentage of the year has passed for any date. Calculates day of year, days remaining, and year progress percent for leap and non-leap years.
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How Many Weeks Pregnant Am I?Find out how many weeks and days pregnant you are from your last menstrual period (LMP). Enter your LMP and an as-of date to get gestational age instantly.
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Subtract Days From a Date CalculatorSubtract any number of days from a date instantly. Enter a start date and the days to subtract to get the exact earlier calendar date.
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Add Months to a Date CalculatorAdd (or subtract) any number of months to a date. Handles month-end overflow by clamping the day to the last valid day of the resulting month.
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Days Lived CalculatorFind out exactly how many days you have lived. Enter your date of birth and an end date to count the total days, weeks, hours and years between them.
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Relationship Length CalculatorFind out exactly how long you've been together. Enter your relationship start date to get years, months, days, total weeks and total days.
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Shift Length CalculatorCalculate how many hours you worked in a shift from start and end times minus your unpaid break. Handles overnight shifts that cross midnight.
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Calendar Days vs Business Days CalculatorCount business days (workdays) between two dates. Subtracts weekends and optional public holidays from total calendar days. Free workday calculator.
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Sleep Cycle CalculatorFree sleep cycle calculator. Find the best bedtime or wake-up time based on 90-minute sleep cycles plus the time it takes you to fall asleep.
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Rule of 72 Doubling Time CalculatorUse the Rule of 72 to estimate how many years it takes an investment to double at a given annual rate. Fast, free doubling time calculator.
Frequently asked questions
What kinds of time and date calculations can I do here?
The collection covers finding the duration between two dates or timestamps, converting hours and minutes to decimal form, totaling minutes for timesheets, and more. Whether you need elapsed time between events or the exact number of days until a deadline, there is a dedicated calculator ready.
How accurate are the duration results?
All calculators follow standard calendar and time-conversion rules, including leap years in date-based tools. Results are reliable for scheduling, payroll, and everyday planning. For legal deadlines, financial contracts, or other official purposes, double-check against an authoritative source such as the relevant organization's official calendar.
Do I need an account or subscription?
No — every duration and time calculator here is free with no sign-up required. Just pick the tool, enter your times or dates, and get your answer immediately. No registration or payment is needed at any point.
Does the calculator remember or record my dates and times?
No data is stored or transmitted. All calculations run locally in your browser, so your inputs stay on your device and are never sent to any server or shared with third parties.
Which duration calculators are the most popular?
The list on this page is ordered by real visitor usage, with the most-used tools at the top. Switch to the Trending tab to see which calculators are gaining the most traffic right now, or Recently Added for the newest tools.
