Specialty & Other

Time to Decimal Calculator

Updated April 2025

Payroll and timesheet use

Reviewed by a payroll professional

Enter TimeFree · No signup

Hours

Minutes (0–59)

Seconds (optional)

Formula

Decimal Hours = Hours + (Minutes ÷ 60) + (Seconds ÷ 3600)

To reverse:
Hours = floor(Decimal)
Minutes = floor((Decimal − Hours) × 60)
Seconds = round(((Decimal − Hours) × 60 − Minutes) × 60)

There are 60 minutes in an hour, so each minute equals 1/60 ≈ 0.0167 of a decimal hour. Each second equals 1/3600 ≈ 0.000278 of a decimal hour.

Example Calculations

Payroll Timesheet

Monday:   8h 30m = 8 + 30/60    = 8.50
Tuesday:  7h 45m = 7 + 45/60    = 7.75
Wednesday:8h 15m = 8 + 15/60    = 8.25
Thursday: 9h  0m = 9 + 0/60     = 9.00
Friday:   6h 20m = 6 + 20/60    = 6.333

Weekly total: 8.50+7.75+8.25+9.00+6.333
            = 39.833 decimal hours

Freelance Invoice

Project design:    2h 45m = 2.75 hrs
Client calls:      1h 20m = 1.333 hrs
Revisions:         0h 50m = 0.833 hrs
Documentation:     0h 30m = 0.50 hrs

Total: 2.75 + 1.333 + 0.833 + 0.50
     = 5.417 hours
Rate: $85/hr
Invoice: 5.417 × $85 = $460.42

Common Mistakes

Treating minutes as hundredths

1:30 does not equal 1.30 decimal hours, it equals 1.50. Minutes are out of 60, not 100. Always divide minutes by 60.

Forgetting to carry over minutes ≥ 60

If you work 1 hour 90 minutes, that is actually 2 hours 30 minutes = 2.50 decimal hours. The minutes field must stay between 0 and 59.

Rounding too aggressively

Many payroll systems accept only 2 decimal places, but rounding 0.333 to 0.33 loses about 36 seconds per hour. Over a full week this can amount to several minutes of unpaid time.

Entering total minutes instead of hours + minutes

If you worked 90 minutes total, enter 1 hour and 30 minutes, not 90 minutes. Entering 90 in the minutes field gives 1.5, but entering it in hours gives 90 decimal hours.

Not accounting for unpaid breaks

Subtract break time before converting. A 9:00–5:00 shift with a 30-minute unpaid lunch is 7.5 hours, not 8.0. Input the actual worked time.

Frequently Asked Questions

More Calculators

Illinois Paycheck Calculator Overtime Calculator Deadline Date Calculator Weighted Average Calculator Self-Employment Tax Time and a Half Calculator

Sources & References

U.S. Department of Labor: FLSA Overtime Rules. Federal requirements for tracking compensable hours and pay period calculation. dol.gov/agencies/whd/flsa
American Payroll Association (APA): Payroll Fundamentals. Industry standard guidance on time rounding rules, decimal conversion, and record-keeping best practices.
IRS Publication 15 (Circular E): Employer's Tax Guide. Official guidance on payroll period recordkeeping including time-to-wage calculation methods.

Hassaan Rasheed

Developer and Researcher, CalculatorFlux

Researches and verifies the formulas, methodology, and source data behind each calculator on CalculatorFlux. All tools are built and checked against the cited references before publication.

Last updated: May 2026

Minutes to Decimal

Minutes	Decimal
5 min	0.083
6 min	0.100
10 min	0.167
12 min	0.200
15 min	0.250
20 min	0.333
24 min	0.400
25 min	0.417
30 min	0.500
36 min	0.600
45 min	0.750
48 min	0.800
50 min	0.833
54 min	0.900

Payroll Rounding Rules

The FLSA allows rounding to the nearest 5-minute increment, one-tenth of an hour (6 min), or quarter-hour (15 min), but rounding must be neutral over time and not consistently favor the employer.