Hours to Decimal Calculator (h:mm to decimal hours for payroll)

Understanding the hours to decimal converter — concept and principle

This converter turns time worked in hours and minutes into decimal hours, works out pay at an hourly rate, and turns decimal hours back into hours and minutes. It is used for timesheets, payroll, invoicing by the hour and project tracking.

Minutes become a decimal: with the default inputs the result is 7.75 hours (pay $139.50).

How it is calculated

Decimal hours = hours + minutes ÷ 60 + seconds ÷ 3,600.
Total minutes = decimal hours × 60.
Nearest quarter hour = round(seconds ÷ 900) ÷ 4.
Pay = decimal hours × hourly rate.
Reverse: the whole number is the hours; the fraction × 60 gives the minutes (and the remaining fraction × 60 the seconds).

The principle

Clock time counts in base 60: 60 minutes make an hour. Payroll and spreadsheets work in base 10, so 45 minutes must be written as 45 ÷ 60 = 0.75 of an hour, not 0.45. Mixing the two is the most common timesheet error. Converting back simply reverses the division. Some employers round to the nearest quarter hour or tenth of an hour; US federal rules allow such rounding only if, over time, it does not consistently work against the employee.

Worked example

Default inputs: 7:45 worked, rate $18, and 7.6 decimal hours to convert back.

7:45 = 7 + 45 ÷ 60 = 7.75 hours.
Total minutes = 7.75 × 60 = 465; nearest quarter hour = 7.75.
Pay = 7.75 × 18 = $139.50.
7.6 hours = 7 h + 0.6 × 60 = 36 min = 7:36:00, or 456 minutes.

Each point is the calculator re-run with only “Time worked (h:mm or h:mm:ss)” changed; the gold point is the default example. Change the inputs above and this chart follows your numbers.

Time worked (h:mm or h:mm:ss)	Decimal hours
1.75	1.75
3.5	3.5
5.25	5.25
7	7
8.75	8.75
10.5	10.5
14	14

How to read the result

Use the decimal figure when multiplying by a rate or adding hours in a spreadsheet, and the h:mm figure when reading a clock. Check that totals for a week add up in the same format. Common conversions: 15 min = 0.25 h, 20 min = 0.33 h, 30 min = 0.5 h, 40 min = 0.67 h.

Common mistakes

Writing 7:45 as 7.45 hours.
Reading 7.6 hours as 7 hours 6 minutes.
Rounding each day separately and adding the rounded values.
Forgetting unpaid breaks before converting.

Keep in mind: Overtime, break and rounding rules depend on your employment law and contract. The calculator does the arithmetic only.

Frequently asked questions

How do I convert 7 hours 45 minutes to decimal?

Divide the minutes by 60: 7 + 45/60 = 7.75 hours.

What is 0.6 of an hour in minutes?

0.6 × 60 = 36 minutes.

Can my employer round my hours?

In the US, rounding to 5, 6 or 15 minutes is allowed only if it averages out fairly over time.

Sources: BIPM, The International System of Units (SI Brochure), 9th ed., Table 8 (1 h = 60 min = 3,600 s) · US Code of Federal Regulations, 29 CFR 785.48(b) (rounding of recorded working time)

Checked 9 Nov 2026. 1 h = 60 min = 3,600 s (SI Brochure, 9th ed., Table 8); rounding of recorded working time: U.S. Code of Federal Regulations, 29 CFR 785.48(b).

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