Project Timesheet
Add rows for each project or task. Enter start and end times to calculate hours.
How the Timesheet Calculator Works
Track project hours in four easy steps.
Name Your Projects
Enter the project or task name in each row. This labels your entries for easy identification when reviewing totals.
Enter Start & End
Set the start time and end time for each entry. The calculator supports 24-hour format and handles overnight shifts.
Add More Rows
Click "+ Add Row" for each additional project or task. There's no limit — add as many entries as you need for your timesheet period.
Review Grand Total
Each row shows its individual duration. The grand total at the bottom sums all rows into HH:MM and decimal hours.
What Is a Timesheet Calculator?
Understanding project-based time tracking and how it helps.
Project-level time tracking
A Timesheet Calculator helps you log hours across multiple projects or tasks in a single view. Unlike a simple time difference tool, it lets you record many entries with labels, computing individual durations and a combined grand total.
This mirrors the paper timesheets used in workplaces, but with automatic calculations — no manual addition or conversion errors.
Per-row and aggregate calculations
Each row independently computes the duration between its start and end time. The calculator handles base-60 arithmetic automatically — 9:00 to 12:30 is 3 hours 30 minutes, not 3.30. The grand total sums all row durations, carrying minutes into hours.
Decimal hours for payroll
Payroll systems typically need decimal hours. The calculator provides this automatically: 7h 30m = 7.50 decimal hours. This eliminates the common conversion mistake where people enter 7.30 instead of 7.50.
When to Use a Timesheet Calculator
Common scenarios for project-based time tracking.
Freelance & Consulting
Track billable hours across multiple clients. Each row = one client or project. Export the grand total for invoicing at your hourly rate.
Team Management
Compile team members' daily time entries. Review individual project allocations and ensure the total hours match the expected workload.
Project Budgeting
Compare estimated vs. actual hours per project. If design was budgeted at 20h but the timesheet shows 28h, you know where scope is growing.
Academic Research
Log lab hours, research time, and writing sessions. Many institutions require time logs for grants and research funding reports.
Maintenance & Field Work
Record service call durations across multiple job sites. Each row = one call. Grand total informs resource allocation and billing.
Legal Time Tracking
Attorneys log billable hours per client matter. The decimal hours output matches legal billing software requirements for 6-minute increments.
Frequently Asked Questions
Common questions about the Timesheet Calculator.
You can add unlimited rows to the timesheet. Each row tracks a separate project or task with its own start time, end time, and calculated duration. Click "+ Add Row" to add more entries.
Yes. If the end time is earlier than the start time, the calculator assumes the shift crosses midnight and calculates accordingly. For example, 10:00 PM to 6:00 AM = 8 hours.
Currently, the calculator runs in your browser and does not support direct export. You can copy the totals manually or use your browser's print function (Ctrl+P) to save a PDF of the page.
The grand total sums all individual row durations. Each row calculates the difference between start and end time. The sum is shown in both HH:MM format and decimal hours.
Yes. Add one row per day or per task/project and fill in the start and end times. The grand total gives you the complete hours for the period. For a full weekly timecard with overtime, try our Time Card Calculator.
No. All calculations happen in your browser. No data is sent to any server. If you close or refresh the page, the timesheet resets. Always note your totals before leaving the page.