Time Addition Calculator

Timesheet Calculator

01
: :
02
: :
Total Duration
00 hours
:
00 minutes
:
00 seconds
0 total minutes 0 total seconds
✓ Copied to clipboard!

How It Works

Enter each day's work hours as a separate row to compile a weekly total. The calculator sums all entries, subtracts break periods, and outputs the net total in HH:MM:SS, total minutes, and total seconds.

Three simple steps:

  1. Enter Monday's work hours in the first row (hours, minutes, seconds).
  2. Click Add Row for each additional day. Set break rows to minus (subtract) to deduct unpaid time.
  3. Read the weekly total in the result panel. Click Copy Result for payroll or invoicing systems.

Enter up to 7 daily rows for a standard work week, or add more for multi week billing periods, contractor invoicing, or project based tracking.

Each row is independent: combine full time, part time, and overtime entries in a single calculation.

Click blocks to combine them
2 hours
+
45 min
+
30 sec
02:45:30 Total Duration
Breakdown 9,930 total seconds
2h (72.5%) 45m (27.2%) 30s (0.3%)

What Is the Formula?

1 Hour
×60
60 Minutes
×60
3,600 Seconds
Live Converter: type any value
HOURS
=
MINUTES
=
SECONDS

The timesheet formula is: <strong>Weekly Total = Mon + Tue + Wed + Thu + Fri minus Breaks</strong>. Enter each day's hours and deduct unpaid periods. The calculator normalizes all values using base 60 carry over for accurate totals.

Common rounding increments:

  • 15 minute rounding: 1h 07m rounds to 1h 00m; 1h 08m rounds to 1h 15m
  • 6 minute rounding: 1h 02m rounds to 1h 00m; 1h 04m rounds to 1h 06m
  • 30 minute rounding: 1h 14m rounds to 1h 00m; 1h 16m rounds to 1h 30m

Use the live converter below to see how timesheet hours translate between HH:MM:SS and total minutes for payroll data entry.

Worked Example

See 4 common scenarios where the calculator streamlines weekly time tracking:

Log a Standard Monday to Friday Work Week

Enter 5 daily entries of 8 hours each. Formula: 8h × 5 = 40h 00m (40:00:00). This confirms a standard work week with 2,400 total minutes for payroll.

Monday08:00:00
Tuesday06:30:00
Wednesday02:15:00
Weekly Timesheet Total 16:45:00
40h 00m standard week

Track a Part Time Weekly Schedule

Sum 3 part time shifts: 6h 00m + 6h 30m + 6h 00m = 18h 30m (1,110 total minutes for the pay period report).

Shift 1 (Mon)00:25:00
Shift 2 (Wed)01:10:00
Shift 3 (Fri)00:20:00
Part Time Weekly Total 01:55:00
18h 30m part time week

Build a Contractor Invoice Period

Compile 4 project blocks for a biweekly invoice. Total: 14h 30m + 12h 15m + 13h 00m + 13h 00m = 52h 45m (3,165 minutes × hourly rate = invoice amount).

Project A00:42:15
Project B00:38:40
Project C00:55:30
Project D01:22:10
Biweekly Billable Hours 03:38:35
52h 45m invoice period

Roll Up Team Hours for Reporting

Sum 4 team members' weekly hours. Calculation: 40h + 38h 30m + 36h 00m + 38h 00m = 152h 30m total for labor budgeting and headcount analysis.

Employee A03:20:00
Employee B01:45:00
Employee C05:10:00
Employee D00:50:00
Department Weekly Total 11:05:00
152h 30m team total

Exporting and Formatting

Results display in 3 formats: HH:MM:SS for standard reporting, total minutes for billing systems, and total seconds for granular data exports. Click Copy Result to transfer the value directly to your clipboard.

1
Enter Days
2h 75m 90s
2
Sum All Shifts
2h 76m 30s
Monday to Friday entries sum to weekly total
3
Deduct Breaks
3h 16m 30s
Subtract unpaid lunch and break rows
✓
Net Timesheet
03 : 16 : 30
⏱️

For decimal hour payroll systems, divide total minutes by 60. For example, 2,400 minutes ÷ 60 = 40.00 decimal hours.

📊

Maintain a separate row for each day to create an auditable timesheet trail. Avoid combining multiple days into a single row: individual entries simplify corrections and approvals.

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Common Questions

Quick answers about building timesheets, rounding rules, and exporting totals for payroll.

How do I build a weekly timesheet with this tool?
Enter each day's work hours as a separate row, deduct breaks as subtract rows, and read the weekly total.
Can I deduct lunch breaks from my timesheet?
Yes, add a subtract row for each unpaid break and it is deducted automatically.
How do I convert the timesheet total to decimal hours?
Divide the total minutes by 60 (e.g., 2,400 minutes = 40.00 decimal hours).
Does the calculator apply rounding rules?
No, it shows exact unrounded values so you can apply your own rounding policy afterward.
Can I use this for contractor invoicing?
Yes, enter each project block as a row and the total shows cumulative billable hours.
How many rows can I add for a multi week timesheet?
There is no row limit — add entries for 1 week, 2 weeks, or an entire month.
Can I copy the result for payroll software?
Yes, click Copy Result to transfer the HH:MM:SS value to your clipboard.
What is a standard 40 hour work week in minutes?
A 40-hour week equals 2,400 minutes (40 × 60).
Can I track part time and full time shifts in the same timesheet?
Yes, each row is independent so you can mix 4-hour and 8-hour days in the same calculation.