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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Time Duration CalculatorCalculate time duration quickly and accurately with this Time Duration Calculator. Input start and end times to find the exact interval between two points in time.
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Fortnight to Hours CalculatorConvert days into total hours instantly. Enter days plus optional extra hours to get the exact number of hours and minutes using Hours = days × 24.
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Hours Between Two Times CalculatorCalculate the number of hours and minutes between two times. Handles overnight spans (end before start) by wrapping to a 24-hour clock.
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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 to Hours CalculatorConvert minutes to hours instantly. Enter any number of minutes and get the exact decimal hours plus an hours-and-minutes breakdown.
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HH:MM:SS to Hours, Minutes, Seconds ConverterConvert a HH:MM:SS duration into total hours, minutes, or seconds. Supports decimals, values over 59, and negative durations. Free online time converter.
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Date ± Calendar Units CalculatorAdd or subtract days, weeks, months, quarters or years from any date. Returns the new calendar date, weekday and day-of-year. Gregorian, works worldwide.
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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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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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Days to Hours CalculatorConvert days to hours instantly with this free Days to Hours Calculator. Enter any number of days and get the exact total hours using hours = days × 24.
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Minutes to Seconds CalculatorConvert minutes to seconds instantly. Enter any number of minutes and get the exact equivalent in seconds using seconds = minutes × 60.
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Seconds to Hours CalculatorConvert seconds to hours instantly. Enter any number of seconds and get the exact hours (and minutes) using hours = seconds ÷ 3600.
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Meeting Time Across Time Zones CalculatorConvert a meeting time from one city to another using UTC offsets. Instantly see the local time in City B and whether it falls on a different day.
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Countdown to New Year CalculatorFind out exactly how many days, hours, minutes and seconds remain until January 1 of next year from any chosen date and time.
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Countdown to Date CalculatorCountdown to any date and time. See the exact days, hours, minutes and seconds remaining — or how long ago a past date occurred.
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Days Until Christmas CalculatorFind out how many days until Christmas (December 25). Enter any start date for an instant countdown showing days and weeks until the holiday.
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Work Hours Calculator with Lunch BreakCalculate net work hours from clock-in and clock-out times after subtracting your lunch break. Supports overnight shifts. Free and instant.
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Hours to Seconds CalculatorConvert hours to seconds instantly. Enter any number of hours and get the exact equivalent in seconds using seconds = hours × 3600.
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Intermittent Fasting Time CalculatorCalculate when your fast ends and your eating window opens and closes based on your last meal and chosen fasting schedule like 16:8 or 18:6.
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Half-Life Time CalculatorCalculate the time required for a substance to decay from an initial quantity to a remaining amount using its half-life and the decay formula.
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Time and a Half CalculatorCalculate time and a half overtime pay. Enter your hourly rate, regular hours, and overtime hours to see your 1.5× overtime rate and total pay.
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Days Ago CalculatorFind out what date it was N days ago. Enter the number of days and get the exact past date, weekday, and ISO format instantly.
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.
