Question 1

How do I calculate hours between two times?

Accepted Answer

Select the "Hours between" tab, enter your start time and end time in HH:MM format (24-hour clock), then click Calculate. The calculator subtracts the start from the end and shows the elapsed duration in hours and minutes, decimal hours, total minutes, and total seconds. For example, 08:30 to 17:00 returns 8h 30m (8.50 decimal hours, 510 total minutes).

Question 2

How do I calculate hours worked with a lunch break?

Accepted Answer

Use the "Hours between" tab, enter your start and end times, then fill in the Break fields — enter the break in hours and minutes. The calculator subtracts the break from the gross duration to produce a net total. For example, 08:30 to 17:00 with a 30-minute break gives a gross of 8h 30m and a net of 8h 00m (8.00 decimal hours).

Question 3

How do I calculate hours for a shift that crosses midnight?

Accepted Answer

Use the "Hours between" tab, enter your start and end times, then check the "Crosses midnight" box. When this option is enabled, an end time earlier than the start time is treated as the next calendar day. For example, a shift from 22:00 to 06:00 returns 8 hours rather than an error.

Question 4

What are decimal hours and why are they useful?

Accepted Answer

Decimal hours express a duration as a single number instead of hours and minutes. For example, 8 hours 30 minutes equals 8.50 decimal hours, and 8 hours 45 minutes equals 8.75 decimal hours. Decimal hours are the standard input format for payroll, billing, and time-tracking systems because they can be multiplied directly by an hourly rate without any conversion.

Question 5

How do I convert hours and minutes to decimal hours?

Accepted Answer

Switch to the "To decimal" tab, enter the hours component in the Hours field and the minutes component (0–59) in the Minutes field, then click Calculate. The result shows decimal hours, total minutes, and total seconds. The formula is: decimal hours = (hours × 60 + minutes) ÷ 60. For example, 8 hours 45 minutes = (8 × 60 + 45) ÷ 60 = 525 ÷ 60 = 8.75 decimal hours.

Question 6

How do I add multiple hours together?

Accepted Answer

Switch to the "Add hours" tab. Each row has a hours field and a minutes field. Click "Add row" to add more entries. Rows with 0h 0m are ignored. Click Calculate to get the total hours, decimal hours, total minutes, average per entry, and entries counted. This mode is useful for totaling separate sessions or durations across multiple entries.

Question 7

What time is 8 hours after 6:00 AM?

Accepted Answer

Use the "Hours from time" tab. Set the start time to 06:00, select "Add", enter 8 hours and 0 minutes, then click Calculate. The result is 14:00 (2:00 PM), same day. This mode handles any addition or subtraction — including shifts that cross midnight — and shows both the 12-hour and 24-hour result along with a day indicator.

Question 8

What time was it 4 hours before noon?

Accepted Answer

Use the "Hours from time" tab. Set the start time to 12:00, select "Subtract", enter 4 hours and 0 minutes, then click Calculate. The result is 08:00 (8:00 AM), same day. If the subtraction goes back past midnight — for example, subtracting 6 hours from 02:00 — the result shows the previous day.

Question 9

What is the difference between this and the Time Duration Calculator?

Accepted Answer

The Hours Calculator focuses on clock-time operations: elapsed hours between two times of day, converting a duration to decimal hours, adding up multiple durations, or finding a result time by adding or subtracting hours from a start time. The Time Duration Calculator adds a full Date & time mode with calendar-aware breakdowns in years, months, and days — useful for periods spanning many days or months. For a single day's hours or simple clock-time arithmetic, use the Hours Calculator.

Question 10

Is this a payroll calculator or timesheet calculator?

Accepted Answer

No. The Hours Calculator performs clock-time arithmetic only — it calculates elapsed hours, converts durations, adds time entries, and finds result times. It does not calculate wages, salaries, overtime, or any monetary amounts. For payroll calculations, use the decimal hours result from this calculator as an input in your payroll system.

Hours Calculator

Hours inputs

How the Hours Calculator works

Mode 1 — Hours between times

Mode 2 — Hours to decimal

Mode 3 — Add multiple hours

Mode 4 — Hours from time

Gross vs. net hours

Assumptions and limitations