Decimal Time Converter
Convert decimal hours to hours and minutes (HH:MM) — and back. Used for payroll, billing, and timesheets.
Decimal Hours → HH:MM
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HH:MM → Decimal Hours
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Decimal Hours to Minutes Chart
Most common decimal hour values with their HH:MM equivalent and total minutes.
| Decimal Hours | HH:MM | Total Minutes |
|---|---|---|
| 0.08 | 0:05 | 5 min |
| 0.17 | 0:10 | 10 min |
| 0.25 | 0:15 | 15 min |
| 0.33 | 0:20 | 20 min |
| 0.42 | 0:25 | 25 min |
| 0.50 | 0:30 | 30 min |
| 0.58 | 0:35 | 35 min |
| 0.67 | 0:40 | 40 min |
| 0.75 | 0:45 | 45 min |
| 0.83 | 0:50 | 50 min |
| 0.92 | 0:55 | 55 min |
| 1.00 | 1:00 | 60 min |
| 1.25 | 1:15 | 75 min |
| 1.50 | 1:30 | 90 min |
| 1.75 | 1:45 | 105 min |
| 2.00 | 2:00 | 120 min |
| 2.25 | 2:15 | 135 min |
| 2.50 | 2:30 | 150 min |
| 2.75 | 2:45 | 165 min |
| 3.00 | 3:00 | 180 min |
| 3.50 | 3:30 | 210 min |
| 4.00 | 4:00 | 240 min |
| 4.50 | 4:30 | 270 min |
| 5.00 | 5:00 | 300 min |
| 5.50 | 5:30 | 330 min |
| 6.00 | 6:00 | 360 min |
| 6.50 | 6:30 | 390 min |
| 7.00 | 7:00 | 420 min |
| 7.50 | 7:30 | 450 min |
| 8.00 | 8:00 | 480 min |
| 8.50 | 8:30 | 510 min |
| 9.00 | 9:00 | 540 min |
| 10.00 | 10:00 | 600 min |
| 12.00 | 12:00 | 720 min |
Formula: decimal part × 60 = minutes. Example: 1.75 → 0.75 × 60 = 45 min → 1:45.
Most Searched Decimal Time Conversions
What Is Decimal Time?
Decimal time (also called decimal hours) expresses a duration entirely as a single number rather than splitting it across hours and minutes. Instead of writing “1 hour and 45 minutes,” decimal time writes 1.75 hours.
The conversion is straightforward: the integer part is the hours, and the decimal part is the fraction of an hour in minutes. Since one hour has 60 minutes, a decimal of 0.5 means 30 minutes (0.5 × 60 = 30), and 0.25 means 15 minutes (0.25 × 60 = 15).
📊 Payroll systems, project management software, and legal billing platforms default to decimal hours because multiplying a decimal by a rate is a single arithmetic step — no unit conversion required. For example: 6.25 hours at $40/hour = $250.00 exactly.
How to Convert Decimal Hours to HH:MM
Step 1 — Separate the integer and decimal parts
Take the number before the decimal point as your hours. For 1.75: the integer part is 1 hour.
Step 2 — Multiply the decimal part by 60
Take the decimal part and multiply by 60 to get minutes. For 1.75: 0.75 × 60 = 45 minutes.
2.25 → 0.25 × 60 = 15 min → 2:15 | 3.5 → 0.5 × 60 = 30 min → 3:30
Reverse: HH:MM to decimal hours
Divide the minutes by 60 and add to the hours. For 2:45: 45 ÷ 60 = 0.75. Add to hours: 2 + 0.75 = 2.75 decimal hours.
1:30 → 30 ÷ 60 = 0.5 → 1.5 | 4:20 → 20 ÷ 60 ≈ 0.333 → 4.333
When Is Decimal Time Used?
Payroll systems: Most payroll software (ADP, Gusto, QuickBooks Payroll) stores hours worked in decimal format. A timesheet showing 8.5 hours means 8 hours 30 minutes. HR teams convert employee clock-in/out times to decimals before running payroll calculations.
Legal billing: Law firms and consultants often bill in decimal increments — commonly 0.1 hour (6-minute) blocks. A meeting of 45 minutes is billed as 0.75 hours.
Spreadsheets and Excel: Excel stores time values as fractions of a day. When you enter 1:30 (one hour thirty minutes) in a cell, Excel internally stores 0.0625 (1.5 hours ÷ 24). To work with hours directly, converting to decimal first avoids formula errors.
Project tracking: Tools like Toggl, Harvest, and Jira export time logs as decimal hours so they can be summed and multiplied without unit conversion.
Aviation logbooks: Flight time in aviation is always logged as decimal hours. A flight of 1 hour 42 minutes is logged as 1.7 hours.
Frequently Asked Questions
How do I convert 1.5 hours to minutes?
1.5 hours = 1 hour and 30 minutes. Take the decimal part (0.5) and multiply by 60: 0.5 × 60 = 30 minutes. Result: 1 hour 30 minutes, written 1:30.
What is 0.75 hours in minutes?
0.75 hours = 45 minutes. 0.75 × 60 = 45. So 0.75 hours = 0 hours 45 minutes, written 0:45.
What is 2.25 hours in minutes?
2.25 hours = 2 hours 15 minutes. 0.25 × 60 = 15 minutes. Written 2:15.
How do I convert 1 hour 45 minutes to decimal?
1 hour 45 minutes = 1.75 decimal hours. Formula: 45 ÷ 60 = 0.75. Add to hours: 1 + 0.75 = 1.75.
What is 0.5 hours in minutes?
0.5 hours = 30 minutes. 0.5 × 60 = 30. This is one of the most common conversions — half an hour is always 0.5 in decimal format.