How to Use This Tool
Enter Time Durations
Type hours, minutes, and seconds for each time entry. Start with one row and add more as needed.
Add More Entries
Click the add button to create additional rows. You can add as many time durations as you need.
See the Total
The tool instantly sums all entries and shows the total in hours, minutes, seconds, decimal hours, and total seconds.
Remove Entries
Click the remove button on any row to delete it. The total recalculates automatically.
Frequently Asked Questions
Is this tool really free?
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Yes, completely free with no limits and no sign-up. Everything runs in your browser.
Is my data sent to a server?
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No. All math happens directly in your browser. Nothing you enter is ever sent anywhere.
How many time entries can I add?
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There is no fixed limit. Add as many rows as you need and the tool sums them all.
What output formats are shown?
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The total is shown in hours:minutes:seconds, decimal hours, and total seconds so you can use whichever format you need.
What is decimal hours?
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Decimal hours express the total as a single number with fractions. For example, 1 hour 30 minutes is 1.5 decimal hours. Used in timesheets and payroll.
Can I enter just minutes?
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Yes. Leave the hours and seconds fields at zero and enter only the minutes. The tool handles any combination.
Does it handle overflow?
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Yes. If minutes or seconds exceed 60, the tool correctly rolls them up. For example, 90 minutes becomes 1 hour 30 minutes in the total.
Can I remove a row?
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Yes. Click the remove button next to any entry to delete it. The total updates immediately.
Does it update instantly?
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Yes. The total recalculates every time you change a value or add or remove a row.
Can I use this for timesheets?
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Yes. Enter each task's duration and get a total in decimal hours, which is the format most timesheet systems use.
What Is Time Addition Calculator?
Time Addition Calculator is a free tool that adds multiple time durations together and shows the total in several formats right in your browser. Enter hours, minutes, and seconds for each entry, and the tool sums them instantly. Nothing you enter is ever sent anywhere - all math runs locally on your device.
The total is displayed in hours:minutes:seconds, decimal hours (for timesheets), and total seconds. Add as many rows as you need and remove any you do not want.
Features Explained
Multiple Time Entries
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Add as many time duration rows as you need. Each row has fields for hours, minutes, and seconds.
Instant Total
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The total updates live as you type. No Calculate button needed.
Three Output Formats
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See the total in hours:minutes:seconds, decimal hours, and total seconds so you can use whichever format fits your needs.
Decimal Hours for Timesheets
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Decimal hours (like 7.75) are the format most payroll and timesheet systems use. The tool calculates this for you.
Add and Remove Rows
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Click add to create a new entry or remove to delete one. The total recalculates automatically.
Overflow Handling
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If you enter more than 60 minutes or 60 seconds, the tool correctly rolls them up into the next unit.
Any Combination
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Enter just minutes, just seconds, or a full hours:minutes:seconds entry. The tool handles all combinations.
Clean Row Layout
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Each entry is displayed as a clear row with labeled fields so you can see every value at a glance.
No Limit on Entries
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Add as many time durations as you need. The tool sums everything, whether it is 2 entries or 200.
100% Browser-Based
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All math runs directly in your browser. Nothing you enter is ever sent to any server.
Who Is This Tool For?
Freelancers
Sum up time spent on tasks throughout the day to fill in timesheets and invoices.
Employees
Add up work hours from multiple shifts or tasks to verify payroll and overtime.
Project Managers
Total time estimates from different team members to calculate overall project effort.
Video Editors
Add up clip durations to find the total length of a video project.
Podcast Producers
Sum segment durations to calculate total episode length.
Musicians
Add up track durations to find the total album or setlist length.
Runners
Sum up lap times or split times to see your total race or training duration.
Students
Add up study session durations to track total study time for the week.
Teachers
Sum lesson durations and preparation time for scheduling and reporting.
Call Center Workers
Add up call durations to track total handle time for a shift.
Lawyers
Sum billable time entries to calculate total hours for client invoicing.
Consultants
Total time across multiple meetings and work sessions for client billing.
Drivers
Add up driving time across multiple stops for delivery route planning.
Lab Technicians
Sum experiment durations and processing times for lab scheduling.
Fitness Trainers
Add up exercise intervals and rest periods to calculate total workout time.
Event Coordinators
Total agenda item durations to verify that an event schedule fits the time slot.
Translators
Sum time spent on different sections of a translation project.
Accountants
Total logged hours for billing, compliance, and time tracking reports.
Healthcare Workers
Add up procedure times and patient consultation durations for scheduling.
Dispatchers
Sum response times and service durations for shift reporting.
Photographers
Add up session durations and editing times for client billing.
Researchers
Total observation or experiment durations for data analysis.
Content Creators
Sum filming, editing, and post-production times to estimate project effort.
Anyone
Add up any set of time durations for any reason - work, exercise, cooking, or planning.
Tips for Best Results
Enter partial times
You do not need to fill every field. Enter just minutes, just seconds, or any combination. The tool handles it.
Decimal hours for payroll
Most timesheet systems want decimal hours. 7 hours 45 minutes = 7.75 decimal hours. The tool calculates this for you.
Remove unwanted rows
Click the remove button on any row you do not need. The total recalculates instantly.
No limit on entries
Add as many rows as you need. The tool sums everything, whether it is a few entries or dozens.
Overflow is handled
If you type 90 minutes, the tool correctly shows 1 hour 30 minutes in the total. No need to pre-convert.
Total seconds for precision
The total seconds output is useful when you need a single number for calculations or data entry.
Results update live
Every change to any field recalculates the total instantly. No button to click.
Use for video editing
Enter each clip's duration to calculate the total project length before rendering.
Use for billing
Enter time per task and the decimal hours total gives you the number to put on your invoice.
Privacy is built in
Nothing you enter is ever sent to any server. All math runs in your browser.
Privacy & Security
This tool runs 100% in your browser. Your files stay entirely on your own device. Nothing is uploaded, nothing is shared, and no server, advertiser, or third party has access to your files.
If a tool saves your work on your own device, you can remove it at any time using the Clear All button. Some tools rely on an external service to return their result; in those cases, only the minimum data required for the request is sent, and never your files or content. Any ads shown on this page run in an isolated frame and cannot read, touch, or transmit anything you upload, paste, type, or download here. Advertisers may see standard visit information like your IP address and which page you're on, as described in our Privacy Policy, but your data itself stays fully under your control.
