Can I use AM/PM instead of 24‑hour times?

This tool expects 24‑hour clock entries. Convert AM/PM times to 24‑hour format first (for example, 1 PM = 13:00, 12 AM = 0:00, 12 PM = 12:00).

Does this handle breaks automatically?

No. You’ll need to subtract any break time from the result yourself. For example, if the calculator shows 8 hours and you took a 30‑minute unpaid break, record 7.5 hours.

What if my shift spans more than one night?

This tool assumes at most one midnight crossover between start and end. For multi‑day shifts or very long events, break the time into daily segments and add the durations together, or use a date‑and‑time duration calculator that handles multiple days explicitly.

everyday calculator

Time Duration Calculator

Compute the time elapsed between two clock times, even across midnight.

Results

Hours: 7.75
Minutes: 465.00

Overview

Whether you’re tracking a work shift, logging billable hours, or timing a workout, you often just need to know how much time passed between two clock times. This time duration calculator converts start and end times into elapsed hours and minutes—even when the period crosses midnight—so you don’t have to count by hand.

Instead of mentally counting from 9:30 to 17:15, or from 22:15 to 01:45 the next day, you can plug the times into a simple form and get a clean duration that works for timesheets, invoices, or planning. It’s especially helpful when you have multiple short events or irregular hours and want a fast, consistent way to convert clock times into usable totals.

How to use this calculator

Enter the start time using a 24‑hour clock (for example, 9:30 as 9 and 30, or 21:00 as 21 and 0).
Enter the end time you want to measure up to, also in 24‑hour format.
We convert both times to minutes since midnight, subtract, and adjust if the end time falls after midnight.
Review the elapsed hours and minutes between the two times.
If your period includes unpaid breaks, subtract their duration manually from the result.
Optionally, repeat the process for multiple segments (for example, morning and evening work blocks) and add the durations together to get a total for the day.

Inputs explained

Start time: The clock time when the period begins, expressed as hour (0–23) and minute (0–59) on a 24‑hour clock. For example, 7:45 AM = 7 and 45; 7:45 PM = 19 and 45.
End time: The clock time when the period ends, also on a 24‑hour clock. If you enter a time earlier than the start time, the calculator assumes the period crossed midnight into the next day.

Outputs explained

Hours: The whole‑number part of the elapsed time, representing full hours between start and end after handling any midnight crossover. You can treat this as the "hours" component on a timesheet or invoice once breaks are accounted for.
Minutes: The remaining minutes beyond the whole hours in the elapsed time. Combine this with the hours output to get the complete duration, or divide the total minutes by 60 for a decimal‑hours value if your system prefers decimals.

How it works

We interpret your start and end times as 24‑hour clock values (0–23 hours and 0–59 minutes).

We convert both times into minutes since midnight: totalMinutes = hour × 60 + minute.

We subtract the start total from the end total to get a raw difference in minutes.

If the raw difference is negative (meaning the end time appears earlier than the start time), we assume the end time is on the following day and add 24 hours’ worth of minutes.

We then convert the final difference back into hours and minutes and present both values to you.

Because the math is purely based on clock time, the calculator ignores calendar dates and focuses on a single up-to-24-hour window plus one potential midnight crossover. For multi‑day ranges, you can either repeat the calculation for each day or use this together with a date‑based duration tool on the site.

Formula

StartTotal = startHour × 60 + startMinute\nEndTotal = endHour × 60 + endMinute\nRawDiff = EndTotal − StartTotal\nIf RawDiff < 0, RawDiff += 24 × 60\nHours = floor(RawDiff ÷ 60)\nMinutes = RawDiff mod 60

When to use it

Checking shift durations for payroll or invoicing when all you have is a clock‑in and clock‑out time.
Timing workouts, events, or study sessions, including those that run past midnight.
Quickly computing elapsed time for travel, meetings, or overnight tasks without a stopwatch.
Sanity‑checking logs from time trackers or manual timesheets.
Calculating how long equipment, rooms, or shared resources were in use based on sign‑in and sign‑out times.
Helping students or parents translate study, practice, or screen‑time limits into precise elapsed hours and minutes.

Tips & cautions

Use 24‑hour times to avoid AM/PM confusion (for example, 1 PM = 13:00, 11 PM = 23:00).
If your work or session includes multiple breaks, subtract the total break time from the duration the calculator returns.
For multi‑day spans, break the period into daily chunks or use a date‑based duration tool in addition to this time‑of‑day calculator.
Be cautious around daylight saving time changes—if your shift spans a clock change, manually adjust for the gained or lost hour.
If you regularly log time in decimal hours, you can convert the final hours/minutes result into a decimal by adding hours + (minutes ÷ 60).
To reduce mistakes, get in the habit of writing down start and end times immediately, then batch your duration calculations using this tool once per day or per week.
No built‑in break handling—any unpaid or off‑task time must be subtracted manually from the calculated duration.
Does not explicitly model daylight saving time transitions; you must adjust for DST if a period crosses a clock change.
Treats start and end as times within a 24‑hour window and assumes at most a single midnight crossover; not intended for multi‑day spans.
The calculator focuses on elapsed clock time and does not account for local labor rules, overtime thresholds, or rounding policies that employers or billing systems may require.

Worked examples

Standard workday: 9:30 to 17:15

Start = 9:30 → 9 × 60 + 30 = 570 minutes.
End = 17:15 → 17 × 60 + 15 = 1,035 minutes.
RawDiff = 1,035 − 570 = 465 minutes → 7 hours and 45 minutes (7.75 hours).

Overnight shift: 22:15 to 01:45

Start = 22:15 → 22 × 60 + 15 = 1,335 minutes.
End = 1:45 → 1 × 60 + 45 = 105 minutes.
RawDiff = 105 − 1,335 = −1,230; add 1,440 minutes for midnight crossover → 210 minutes.
Result = 3 hours and 30 minutes (3.5 hours).

Splitting a day into two work blocks

You work from 8:15 to 12:00, then from 13:30 to 17:45 with an unpaid lunch break.
Run the calculator for the morning block: 8:15 to 12:00 = 3 hours 45 minutes.
Run it again for the afternoon block: 13:30 to 17:45 = 4 hours 15 minutes.
Total time worked = 3:45 + 4:15 = 8 hours exactly, which you can record as 8.0 hours on your timesheet.

Deep dive

This time duration calculator converts start and end times into elapsed hours and minutes, even when your shift or event crosses midnight.

Enter 24‑hour start and end times to get an instant duration for payroll, billing, workouts, or scheduling without manual clock math.

Perfect for anyone who needs quick, reliable elapsed time calculations from simple clock‑in and clock‑out times.

Use it alongside other scheduling and time-tracking tools when you want a clear, human‑readable explanation of how long a task actually took between two specific clock times.

FAQs

Can I use AM/PM instead of 24‑hour times?: This tool expects 24‑hour clock entries. Convert AM/PM times to 24‑hour format first (for example, 1 PM = 13:00, 12 AM = 0:00, 12 PM = 12:00).
Does this handle breaks automatically?: No. You’ll need to subtract any break time from the result yourself. For example, if the calculator shows 8 hours and you took a 30‑minute unpaid break, record 7.5 hours.
What if my shift spans more than one night?: This tool assumes at most one midnight crossover between start and end. For multi‑day shifts or very long events, break the time into daily segments and add the durations together, or use a date‑and‑time duration calculator that handles multiple days explicitly.

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This time duration calculator is for quick planning and estimation only and does not replace official time‑tracking or payroll systems. Always confirm recorded hours with your employer’s or client’s policies and tools, especially around overtime, break rules, and daylight saving changes. For legal, payroll, or contractual questions about how time must be recorded, consult your employer, client, or a qualified professional.