Add Time Calculator – Add & Subtract Hours, Minutes & Seconds
⭐ Popular
This add time calculator adds or subtracts as many time values as you need — hours, minutes, and seconds — and gives you an exact total instantly. It’s built for real situations: totaling up timesheet hours across a work week, combining video or podcast clip runtimes, adding up workout intervals and rest periods, or subtracting one time from another to see how long a task or meeting actually took. Whether you’re doing payroll, invoicing a client, or just trying to figure out your total shift length, this tool handles hours, minutes, and seconds together and automatically converts anything over 60 so your total is always correct. Enter your time values below and get your total instantly.
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Total Time
Results are estimates for general use. For payroll or legal time tracking, verify with your employer or a professional.
How to use the add time calculator
- Choose your mode. Use the “Add Times” tab when you’re combining multiple time values into one total — like shift hours or video clips. Use the “Subtract Times” tab when you need to find the difference between a larger time value and a smaller one, like figuring out how long a task took.
- Enter your first time value. Fill in the Hours, Minutes, and Seconds fields for your first row. For example, a 1-hour 45-minute gym session would be entered as 1 hour, 45 minutes, 0 seconds.
- Add more time rows. Click “Add another time” to insert a new row — you can add up to 10 rows total. Use the optional label field on each row (like “Morning shift” or “Video 1”) to keep track of what each value represents.
- Read the result. The large HH:MM:SS number is your total in a single readable format. Below it, the breakdown spells out the same total in plain English — hours, minutes, and seconds. If your total goes over 24 hours, the calculator also shows it broken into days, hours, minutes, and seconds.
- Use Subtract mode for durations. Enter your starting time value, then enter the amount you want to subtract. This is useful for things like video editing — if you have 45 minutes of raw footage and you cut 12 minutes 30 seconds, subtract mode tells you exactly how much footage remains.
- Copy and share your result. Click “Copy Result” to grab the total as text you can paste into an email, timesheet, or invoice. Click “Share” to generate a link with your exact values pre-filled — handy for sending a shift total straight to a manager or client.
The calculator automatically handles base-60 conversion as you go — if you type 75 minutes into a single field, it converts that to 1 hour 15 minutes behind the scenes so your total is never wrong. The same applies to seconds: 90 seconds becomes 1 minute 30 seconds automatically, with no extra steps required from you.
What can you use this time addition calculator for?
This tool comes in handy in more places than you might expect — here’s where people actually use it.
Timesheets and payroll
Add up each day’s shift hours across a full work week to get an exact total for payroll or client invoicing — no more manually carrying minutes over into hours on a notepad.
Video and podcast runtime
Combine the length of every clip, intro, and outro into one total runtime before you export or upload — useful for hitting a target episode length or checking platform limits.
Workout and training tracking
Add up every interval, set, and rest period from a training session to see your true total time under load — great for tracking progress over weeks of workouts.
Task duration by subtraction
Subtract a start time from an end time to see exactly how long a meeting, task, or call ran — perfect when you only know the two clock times, not the elapsed duration.
Race and sports timing
Add together lap times, stage splits, or set durations to calculate a total race time or match length — handy for coaches, athletes, and race organizers alike.
Project time tracking
Log each work block you spend on a project throughout the week, then add them all together to see your total billable hours before sending a client invoice.
Add and subtract time — worked examples
Example 1 — Adding weekly shift hours (timesheet)
Example 2 — Adding video clip runtimes
Example 3 — Subtracting time (task duration)
Scroll back up and try these exact numbers yourself, or swap in your own shift hours, clip lengths, or task times — the calculator updates instantly as you type.
How does adding time work?
Adding time isn’t quite the same as adding regular numbers, because minutes and seconds run on a base-60 system, not base-10. That means once minutes or seconds hit 60, they roll over into the next unit up — just like a clock does.
For example, 45 minutes plus 30 minutes isn’t “75 minutes” as a final answer — it’s 1 hour and 15 minutes, because 60 of those minutes carry over into a full hour. The same carry-over rule applies to seconds: 60 seconds plus 30 seconds becomes 1 minute 30 seconds, not “90 seconds.”
This is exactly why typing time values into a regular calculator gives the wrong answer — a normal calculator doesn’t know that 60 minutes equals 1 hour. This tool does. As you type, it automatically converts any minutes or seconds value of 60 or higher into the correct hours-and-minutes or minutes-and-seconds format, so your final total is always accurate without you needing to do the conversion math yourself.
Frequently asked questions
This is the fastest way to add or subtract time values — hours, minutes, and seconds are all handled together with automatic base-60 conversion, so your total is always correct the first time. It works whether you’re totaling up a week of shifts or finding out exactly how long a task took. Pair it with the Date Duration Calculator, the Elapsed Time Calculator, or the Time Division Calculator for even more time-tracking answers.
Use the free Add & Subtract Time Calculator above — your total is just a few clicks away.