Hours to decimal calculator and minutes to decimal chart

This hours to decimal calculator converts a time like 8 hours 20 minutes into decimal hours, the number payroll multiplies by an hourly rate. Enter whole hours and minutes, and add your rate if you want the pay. The second calculator works the other way, from a decimal such as 7.6 back to hours and minutes. Both show the exact value, the two-place value most payroll uses, and what tenth-hour and quarter-hour rounding would record.

How to use the hours to decimal calculator

1. Enter whole hours and minutes. For a shift of 8 hours 20 minutes, enter 8 and 20. You can also enter only minutes, such as 0 hours and 500 minutes, and the calculator converts the total.
2. Add an hourly rate if you want pay. The calculator shows gross pay from the exact time and from the two-place decimal, so you can see whether rounding changed the paycheck. Leave it blank to convert time only.
3. Use the second calculator to check a pay stub. If your stub says 37.75 hours, enter it to see 37:45 and compare it with your own record.

These calculators convert one figure at a time. To add up a whole week of clock-in and clock-out times with unpaid lunches, use the time card calculator, which shows each day in both hh:mm and decimal. For hours over 40, the overtime calculator applies time and a half.

The formula: minutes ÷ 60

An hour has 60 minutes, so each minute is 1/60 of an hour. To convert hours and minutes to decimal:

decimal hours = whole hours + (minutes ÷ 60)

To go the other way, from a decimal back to clock time:

minutes = decimal part × 60

Because 60 is 2 × 2 × 3 × 5, only minute counts divisible by 3 give a decimal that ends: 3 minutes is 0.05, 15 minutes is 0.25, 45 minutes is 0.75. Every other count repeats forever. One minute is 0.01666…, which is 0.0167 rounded to four places and 0.02 rounded to two. That repeating tail is why the same time can show up as 8.33, 8.333 or 8.3333 on different systems.

Worked examples

The first example is the calculator’s default. Pay figures are gross, before taxes.

1. 8 hours 20 minutes at $18 an hour. 20 ÷ 60 = 0.3333…, so the time is 8.3333… hours, or 8.33 to two places. Exact pay is 500 minutes ÷ 60 × $18 = $150.00. Pay on the rounded figure is 8.33 × $18 = $149.94, six cents less.
2. 7 hours 45 minutes. 45 ÷ 60 = 0.75, so 7.75 hours exactly. At $18, 7.75 × $18 = $139.50.
3. 6 hours 7 minutes. 7 ÷ 60 = 0.1166…, so 6.12 hours to two places. At $18, exact pay is $110.10 and 6.12 × $18 is $110.16. Rounded to the nearest tenth it becomes 6.1 hours ($109.80), and to the nearest quarter it becomes 6.00 hours ($108.00).
4. 7.6 hours back to clock time. 0.6 × 60 = 36, so 7.6 hours is 7:36. This is the reverse calculator’s default.
5. 5.85 hours back to clock time. 0.85 × 60 = 51, so 5.85 hours is 5:51, not 5 hours 85 minutes.

The weekly version matters more. Say an employee works 8:20 on each of five days, 41:40 in total, at $18 an hour. Exact time is 41.6667 hours, so 1 hour 40 minutes is overtime at $27: 40 × $18 + 1.6667 × $27 = $720.00 + $45.00 = $765.00. If each day is rounded to 8.33 first, the week becomes 41.65 hours and pay drops to $720.00 + 1.65 × $27 = $764.55. Converting the week’s total minutes once, at the end, avoids the gap. The guide to calculating overtime covers the regular rate in more detail.

Minutes to decimal chart (1 to 60 minutes)

Use this minutes to decimal chart for any time card. The middle column is the value to two decimal places that most payroll uses. The exact column shows the true value; an ellipsis (…) means the last digit repeats forever, so 0.0166… is 0.016666 and so on.

To use the chart, add the decimal for the minutes to the whole hours: 6 hours 23 minutes is 6 + 0.38 = 6.38 hours, the same figure the hours to decimal calculator above returns. The U.S. Department of Labor’s own FLSA overtime calculator advisor on its elaws site uses the same hundredths approach, with the example that 8 hours 23 minutes is entered as 8.38.

Why payroll decimal hours matter

An hourly rate is dollars per hour, so pay is hours × rate, and that multiplication only works when the hours are a decimal. Clock time is base 60 and decimals are base 100, so mixing them breaks the math in predictable ways.

• 8:30 is not 8.30. 8:30 is 8.50 hours. Typing 8.30 drops 12 minutes, which is $3.60 at $18 an hour, every time it happens.
• Adding clock times needs carrying. 4:45 + 3:30 is 8:15, because 75 minutes carries one hour. In decimals it is simply 4.75 + 3.50 = 8.25.
• Overtime depends on the total. Under the federal Fair Labor Standards Act (FLSA), non-exempt employees earn time and a half for hours over 40 in a workweek. A few minutes lost per day can move the overtime figure, as the weekly example above shows.
• Records must match pay. The DOL’s recordkeeping rule at 29 CFR 516.2 requires employers to keep hours worked each workday and total hours each workweek for non-exempt employees. A conversion error shows up as a mismatch between the time card and the paycheck.

Night premiums and other pay differences use the same decimal hours. If part of a shift earns a higher rate, convert each part separately; our guide to shift differential pay shows the math.

Rounding pitfalls that change pay

Converting is simple. Most errors come from rounding at the wrong step or in the wrong direction. Take 7 minutes, which is exactly 0.1166… hours:

• Recorded as 0.12 (two places): about 0.0033 hours, or 12 seconds, more than worked. Harmless, and it evens out across other minute counts.
• Recorded as 0.1 (nearest tenth): 6 minutes instead of 7, so one minute is lost. At $18 an hour that is $0.30.
• Recorded as 0 (nearest quarter hour): all 7 minutes disappear, $2.10 at $18. Federal rules allow this only as part of a neutral system that also rounds 8 to 14 minutes up.

Three habits keep conversions honest:

1. Add minutes first, convert once. Total the week in minutes, then divide by 60. Rounding every day and then adding, as in the 41.65-hour example, compounds small losses.
2. Round, do not truncate. Cutting 0.3333… to 0.33 is fine, but cutting 0.6666… to 0.66 instead of 0.67 always favors the employer.
3. Keep the original punches. The decimal is a calculation. The clock-in and clock-out times are the record, and they are what you need if a pay question comes up later. A time clock app keeps both.

FLSA rounding rules (29 CFR 785.48)

Federal law does not require employers to pay to the exact minute, but it limits how they may round. The key rule is 29 CFR 785.48(b). It recognizes the practice of recording starting and stopping times to the “nearest 5 minutes, or to the nearest one-tenth or quarter of an hour,” and says the practice is accepted only if it will not result, over a period of time, in failing to pay employees properly for all the time they actually worked.

• The 7-minute rule. The DOL’s Wage and Hour Division explains quarter-hour rounding in Fact Sheet #53: time of 1 to 7 minutes may be rounded down and not counted, but 8 to 14 minutes must be rounded up and counted as a quarter hour. The same fact sheet warns that an employer may violate the FLSA if it always rounds down.
• Neutral in practice, not just on paper. In opinion letter FLSA2026-8, dated May 28, 2026, the Wage and Hour Division looked at a hospital that rounded early clock-ins to the scheduled start time. Where employees were doing compensable work after clocking in, the letter said the policy was neither facially neutral nor neutrally applied, because it only benefited the employer.
• Early and late punches with no work. Under 29 CFR 785.48(a), employees who voluntarily clock in early or stay late without working need not be paid for that time, but major gaps between clock records and real hours raise doubts about the records.
• States can be stricter. In Donohue v. AMN Services (2021), the California Supreme Court held that employers may not round meal-period punches. If you have staff in California, read our California overtime law guide and check the state’s rules before using any rounding.

These rules cover rounding punch times. No federal rule sets how many decimal places payroll must use, but the same principle applies: whatever method you choose, employees must be paid for all the time they worked.

Tenth-hour and quarter-hour conversion tables

If your business records time in tenths (6-minute increments) or quarters (15-minute increments), these tables show what each minute count rounds to under nearest-increment rounding. The calculator above uses the same method, with ties going up.

Tenth-hour rounding never moves time by more than 3 minutes, and quarter-hour rounding by up to 7. Both are allowed under 785.48(b) only if they round in both directions and even out over time. If you can record exact minutes, you avoid the question entirely. Our time card calculator works from exact clock-in and clock-out times with no rounding.

Frequently asked questions