How do I convert hours and minutes to decimal?

Divide the minutes by 60 and add to the hours. Formula: Decimal = Hours + (Minutes / 60). Example: 2 hours 30 minutes = 2 + 30/60 = 2 + 0.5 = 2.5 decimal hours.

What is 1 hour 30 minutes in decimal?

1 hour 30 minutes in decimal is 1.5 hours. Calculation: 30 divided by 60 = 0.5. Then 1 + 0.5 = 1.5 decimal hours. This is commonly used for payroll and billing.

What is 2 hours 45 minutes in decimal?

2 hours 45 minutes in decimal is 2.75 hours. Calculation: 45 divided by 60 = 0.75. Then 2 + 0.75 = 2.75 decimal hours.

What is 8 hours 20 minutes in decimal?

8 hours 20 minutes in decimal is 8.333 hours (8 and one-third hours). Calculation: 20 divided by 60 = 0.3333. Then 8 + 0.3333 = 8.3333 decimal hours, which is typically rounded to 8.33 for payroll.

How do I convert decimal hours back to hours and minutes?

Take the whole number as hours, then multiply the decimal portion by 60 to get minutes. Example: 3.75 hours: whole = 3 hours, decimal = 0.75 x 60 = 45 minutes = 3 hours 45 minutes.

Why do payroll systems use decimal hours?

Payroll systems use decimal hours because standard multiplication works correctly with them. You cannot multiply H:MM by a dollar rate (e.g., 8:30 x $15 gives a wrong answer), but 8.5 x $15 = $127.50 is correct. Decimal hours make wage calculations straightforward.

What is 15 minutes in decimal hours?

15 minutes in decimal hours is 0.25. Divide 15 by 60: 15/60 = 0.25. So 1 hour 15 minutes = 1.25 decimal hours, 2 hours 15 minutes = 2.25 decimal hours, and so on.

What is 45 minutes in decimal?

45 minutes in decimal hours is 0.75. Divide 45 by 60: 45/60 = 0.75. So 1 hour 45 minutes = 1.75, 3 hours 45 minutes = 3.75 decimal hours.

What is 7 hours 30 minutes in decimal?

7 hours 30 minutes in decimal is 7.5 hours. Calculation: 30/60 = 0.5. Then 7 + 0.5 = 7.5 decimal hours. A common part-time or reduced-hours workday.

How do I use decimal hours for payroll?

Convert each shift to decimal hours, add up the total for the week, then multiply by the hourly rate. Example: 40.5 decimal hours x $18/hr = $729.00. For overtime, calculate regular hours (up to 40) at base rate and extra hours at 1.5x rate.

What is 10 minutes in decimal hours?

10 minutes in decimal hours is 0.1667 (or approximately 0.17). Divide 10 by 60: 10/60 = 0.1667. Every 6 minutes equals exactly 0.1 decimal hours, so 10 minutes is just under 0.2.

What is 3 hours 15 minutes in decimal?

3 hours 15 minutes in decimal is 3.25 hours. Calculation: 15 divided by 60 = 0.25. Then 3 + 0.25 = 3.25 decimal hours.

Time to Decimal Calculator Convert H:MM

Hours Enter hours (0 or more).

Whole hours only

Minutes Enter minutes (0–59).

0 to 59 minutes

Quick Reference

H:MM	Decimal
0:15	0.25
0:30	0.50
0:45	0.75
1:30	1.50
2:45	2.75
7:30	7.50
8:20	8.333
8:30	8.50

Decimal Hours

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Sources & Methodology

✓ Formula verified against NIST time standards and standard payroll arithmetic references.

🏛

NIST Time and Frequency Division

National Institute of Standards and Technology — authoritative reference for time measurement and base-60 arithmetic

📋

U.S. Department of Labor — FLSA Time Keeping

Federal guidance on recording hours worked and converting fractional time for payroll calculations under the Fair Labor Standards Act

Formula: Decimal Hours = Hours + (Minutes ÷ 60). The result is rounded to 4 decimal places for precision. Reverse: given decimal D, Hours = floor(D), Minutes = round((D − floor(D)) × 60). Both directions are exact with no rounding error at standard payroll precision (2–4 decimal places).

⏱ Last reviewed: April 2026

How to Convert Time to Decimal Hours

Converting time from H:MM format to decimal hours is a fundamental calculation for payroll, freelance billing, project management, and any situation where you need to multiply time by a dollar rate. The reason decimal hours are necessary is that standard math operations do not work correctly with the base-60 minute system — but they work perfectly with base-10 decimal fractions.

The Formula

Decimal Hours = Hours + (Minutes ÷ 60)

Step 1: Take the minutes portion of your time
Step 2: Divide those minutes by 60
Step 3: Add the result to the whole hours

Example: 3 hours 45 minutes
45 ÷ 60 = 0.75
3 + 0.75 = 3.75 decimal hours

Full Conversion Reference Table

Minutes	Decimal Fraction	Example (2h + min)	Payroll use
0 min	0.0000	2.0000 hrs	Full hour
6 min	0.1000	2.1000 hrs	Every 6 min = 0.1
10 min	0.1667	2.1667 hrs	~0.17
15 min	0.2500	2.2500 hrs	Quarter hour
20 min	0.3333	2.3333 hrs	~0.33
30 min	0.5000	2.5000 hrs	Half hour
45 min	0.7500	2.7500 hrs	Three-quarter hour
48 min	0.8000	2.8000 hrs	0.8 exactly
50 min	0.8333	2.8333 hrs	~0.83

Why You Cannot Skip This Conversion for Payroll

Suppose an employee works 8 hours and 20 minutes at $18.00 per hour. If you naively multiply 8.20 × 18 you get $147.60 — which is wrong. The correct conversion is 8 + (20÷60) = 8.333 decimal hours. Multiplied by $18.00 = $150.00. That $2.40 difference adds up across an entire workforce and can create wage compliance issues under the Fair Labor Standards Act.

The 6-Minute Rule — Mental Math Shortcut

Every 6 minutes equals exactly 0.1 decimal hours. This means you can do fast mental conversions for any multiple of 6 minutes: 12 min = 0.2, 18 min = 0.3, 24 min = 0.4, 30 min = 0.5, 36 min = 0.6, 42 min = 0.7, 48 min = 0.8, 54 min = 0.9. For other values, divide by 60 or use this calculator.

Converting Decimal Hours Back to H:MM

Hours = floor(Decimal) | Minutes = round((Decimal − floor(Decimal)) × 60)

Example: 4.583 decimal hours
Hours = floor(4.583) = 4
Minutes = (4.583 − 4) × 60 = 0.583 × 60 = 35 minutes
Result: 4 hours 35 minutes

💡 Pro tip for timesheets: If your employer rounds to the nearest quarter-hour (0.25), simply round your decimal to the nearest 0.25. So 8.333 hours rounds to 8.25 (8h 15m), and 8.4 hours rounds to 8.5 (8h 30m). Always confirm your employer's rounding policy before applying this.

Frequently Asked Questions

Divide the minutes by 60 and add to the hours. The formula is: Decimal Hours = Hours + (Minutes / 60). Example: 2 hours 30 minutes = 2 + 30/60 = 2 + 0.5 = 2.5 decimal hours. This is the standard method used in payroll systems, billing software, and time-tracking tools worldwide.

1 hour 30 minutes in decimal is 1.5 hours. Divide 30 by 60 to get 0.5, then add to 1 hour: 1 + 0.5 = 1.5. This is one of the most commonly needed conversions for payroll and freelance invoicing.

2 hours 45 minutes in decimal is 2.75 hours. Divide 45 by 60 = 0.75, then add to 2: 2 + 0.75 = 2.75 decimal hours. At $20/hr, 2h 45m of work = 2.75 x $20 = $55.00.

8 hours 20 minutes in decimal is 8.3333 hours (8 and one-third). Divide 20 by 60 = 0.3333. Add to 8: 8.3333 decimal hours. For payroll, this is often written as 8.33. At $18/hr: 8.3333 x $18 = $150.00 exactly.

15 minutes in decimal hours is 0.25. Divide 15 by 60: 15/60 = 0.25. So 1 hour 15 minutes = 1.25, 3 hours 15 minutes = 3.25 decimal hours. A quarter of an hour is always 0.25 in decimal.

45 minutes in decimal is 0.75. Divide 45 by 60 = 0.75. Three-quarters of an hour is always 0.75 in decimal. So 4 hours 45 minutes = 4.75 decimal hours.

Payroll systems use decimal hours because multiplication only works correctly with base-10 numbers. You cannot multiply 8:30 (8 hours 30 minutes) by $15.00 — that is not a valid mathematical operation. But 8.5 x $15 = $127.50 is correct and straightforward. Decimal hours make all pay calculations, overtime computations, and rate comparisons mathematically valid.

Take the whole number as hours, then multiply the decimal part by 60 to get minutes. Example: 3.75 hours — whole number = 3 hours, decimal = 0.75 x 60 = 45 minutes, so 3 hours 45 minutes. Another: 6.833 — 6 hours, 0.833 x 60 = 50 minutes = 6 hours 50 minutes.

7 hours 30 minutes in decimal is 7.5 hours. Half an hour is always 0.5, so 7h 30m = 7 + 0.5 = 7.5. A 7.5-hour workday at $20/hr = $150.00 for that day.

10 minutes in decimal hours is 0.1667 (repeating). Divide 10 by 60 = 0.16667. This is approximately 0.17 when rounded to 2 decimal places. Note: every 6 minutes equals exactly 0.1 decimal hours, so 10 minutes falls between 0.1 (6 min) and 0.2 (12 min).

Convert your total time worked to decimal hours, then multiply by the hourly rate. Example: worked 42 hours 15 minutes = 42 + 15/60 = 42.25 decimal hours. At $22/hr: 42.25 x $22 = $929.50. For overtime (hours above 40): 40 x $22 = $880 regular, plus 2.25 x $33 (1.5x rate) = $74.25 overtime = $954.25 total.

3 hours 15 minutes in decimal is 3.25 hours. Divide 15 by 60 = 0.25. Add to 3: 3 + 0.25 = 3.25 decimal hours. A quarter of an hour (15 minutes) always adds 0.25 to the decimal value.

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