How do I add hours and minutes correctly?

You cannot add time like regular decimals. To add hours and minutes, sum the minutes separately. For every 60 minutes, add 1 to the total hours and keep the remainder as minutes. For example, 1:45 + 1:15 = 2:60 = 3:00.

Why use a decimal hours calculator for payroll?

Most payroll systems calculate pay as (Rate × Decimal Hours). For example, 7 hours 30 minutes must be entered as 7.5 hours to calculate correct payment. Our tool provides this decimal conversion automatically.

How many entries can I sum using this tool?

There is no limit to the number of time blocks you can add. Simply click 'Add Row' to include daily shifts for a weekly or monthly timesheet.

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Professional Hours & Minutes Calculator

Add up multiple time durations for professional timesheets, accurate payroll, or complex project logs.

Time Log entries

Grand Total

0h 00m

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What is Professional Hours & Minutes Calculator?

An Hours Calculator is essential for anyone who works on an hourly basis. It allows you to sum up multiple segments of time—like daily shifts over a week—into a single total. This is crucial for calculating gross pay, tracking project budgets, or monitoring study hours.

Standard addition (base-10) doesn't work for time. For example, adding 1:45 and 1:45 doesn't equal 2:90; it equals 3:30. Our tool automatically "rolls over" minutes into hours every time they hit 60, ensuring your timesheet is mathematically sound and error-free.

How to Use

1Enter your hours and minutes in the first row.
2Click "Add Row" to input more time blocks (e.g., for different days).
3Hit "Sum Total Time" to see the grand total in both standard (h:m) and decimal formats.

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Time to Decimal Conversion Guide

Most modern payroll systems require input in decimal format. Use this quick reference to translate minutes at a glance:

15 mins

.25 hours

30 mins

.50 hours

45 mins

.75 hours

60 mins

1.0 hours

06 mins

.10 hours

12 mins

.20 hours

18 mins

.30 hours

24 mins

.40 hours

Industry Billing Increment Standards

Most professional service firms (Legal, Consulting, Agency) use 6-minute or 15-minute billing increments. This simplifies bookkeeping and accounts for the time spent on administrative tasks like logging into systems, opening project files, and context switching.

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Frequently Asked Questions

Common questions about this calculator

Can I enter negative hours?

While unusual, if you need to subtract time (e.g., for an unpaid break), this tool treats all entries as additions. To subtract, you would manually deduct the total break time from your final sum.

How many rows can I add?

There is no hard limit. You can add as many rows as needed for a week, a month, or even a full project duration.

Is my data saved?

For privacy reasons, entries are only stored in your current browser session. Refreshing the page will clear the entries. Be sure to note your totals before closing the tab.

What is base-60 math?

Also known as sexagesimal, this is the ancient mathematical system used to measure time and angles. Because 60 has many divisors (2, 3, 4, 5, 6, 10, 12, 15, 20, 30), it's easy to break into fractions.