Time to decimal hours is the process of converting hours, minutes, and seconds into a single decimal-hour value. Example, 1 hour, 30 minutes, and 20 seconds equals 1.50556 decimal hours. It is useful for payroll, timesheets, freelance billing, and other situations where working time needs to be recorded or calculated in decimal format.
How to Use the Calculator
Our calculator has two panels for converting time to decimal hours and decimal hours to time, so you can get results instantly. Follow these simple steps to get accurate results.
1. Convert Time to Decimal
Use the left panel to convert hours, minutes, and seconds into decimal hours.
- Enter the Hours in the first box.
- Enter the Minutes (0-59) and Seconds (0-59) in the next two boxes.
- Click “Convert to Decimal” to see the decimal hours, decimal minutes, and total seconds.
2. Convert Decimal to Time
Use the right panel when you have a decimal number (like 8.75) and want to convert it back to standard time.
- Enter your decimal number (e.g., 8.75) in the input box.
- Click “Convert to Time”.
- The tool will display the result in Standard Time (HH:MM:SS) format.
What Does the Calculator Show?
Our Time to Decimal and Decimal to Time calculators show different results. See the four key results below to understand what the calculator shows.
Decimal Hours Payroll Format
Converting standard time to decimal hours gives you your total working time as a single decimal value. This format is commonly used for payroll, timesheets, and accounting.
Standard Time (HH:MM:SS)
The primary result when converting a decimal number back to regular time. This shows exactly how many hours, minutes, and seconds make up that decimal value.
Decimal & Total Minutes
Both calculator panels display your total duration expressed purely in minutes. This is especially useful for billing systems that require fractional minute tracking.
Total Seconds
The basic unit for your input. The calculator multiplies your entire duration into total seconds, which is highly useful for scientific tracking or aviation logs.
Time Conversion Formulas
Below are the exact mathematical formulas to manually convert between time and decimal values, using 2 hours, 45 minutes, and 45 seconds as our example.
Convert Time to Decimal Formula
= 2 + (45 ÷ 60) + (45 ÷ 3600)
= 2 + 0.75 + 0.0125
= 2.7625 Decimal Hours
= (2 × 60) + 45 + (45 ÷ 60)
= 120 + 45 + 0.75
= 165.75 Decimal Minutes
= (2 × 3600) + (45 × 60) + 45
= 7200 + 2700 + 45
= 9,945 Total Seconds
Convert Decimal to Time Formula
Decimal Hours to Time
Let’s apply this formula to convert 2.7625 decimal hours back to time.
Minutes to Decimal Hours Chart
Use this minutes to decimal hours chart to quickly convert minutes into decimal hours. It covers 1 to 60 minutes, with common 15-minute intervals highlighted for easy reference.
| Minutes | Decimal Hours |
|---|---|
| 1 min | 0.02 |
| 2 min | 0.03 |
| 3 min | 0.05 |
| 4 min | 0.07 |
| 5 min | 0.08 |
| 6 min | 0.10 |
| 7 min | 0.12 |
| 8 min | 0.13 |
| 9 min | 0.15 |
| 10 min | 0.17 |
| 11 min | 0.18 |
| 12 min | 0.20 |
| 13 min | 0.22 |
| 14 min | 0.23 |
| 15 min | 0.25 |
| 16 min | 0.27 |
| 17 min | 0.28 |
| 18 min | 0.30 |
| 19 min | 0.32 |
| 20 min | 0.33 |
| Minutes | Decimal Hours |
|---|---|
| 21 min | 0.35 |
| 22 min | 0.37 |
| 23 min | 0.38 |
| 24 min | 0.40 |
| 25 min | 0.42 |
| 26 min | 0.43 |
| 27 min | 0.45 |
| 28 min | 0.47 |
| 29 min | 0.48 |
| 30 min | 0.50 |
| 31 min | 0.52 |
| 32 min | 0.53 |
| 33 min | 0.55 |
| 34 min | 0.57 |
| 35 min | 0.58 |
| 36 min | 0.60 |
| 37 min | 0.62 |
| 38 min | 0.63 |
| 39 min | 0.65 |
| 40 min | 0.67 |
| Minutes | Decimal Hours |
|---|---|
| 41 min | 0.68 |
| 42 min | 0.70 |
| 43 min | 0.72 |
| 44 min | 0.73 |
| 45 min | 0.75 |
| 46 min | 0.77 |
| 47 min | 0.78 |
| 48 min | 0.80 |
| 49 min | 0.82 |
| 50 min | 0.83 |
| 51 min | 0.85 |
| 52 min | 0.87 |
| 53 min | 0.88 |
| 54 min | 0.90 |
| 55 min | 0.92 |
| 56 min | 0.93 |
| 57 min | 0.95 |
| 58 min | 0.97 |
| 59 min | 0.98 |
| 60 min | 1.00 |
Why Convert Time to Decimals?
Standard time uses 60 minutes to make one hour. But calculators, Excel, and many accounting software use decimal numbers instead. Converting time to decimals makes it easier to calculate hours, pay, and other time-based amounts.
Payroll & Timesheets
If an employee works 40 hours and 30 minutes at $20 per hour, you cannot treat the time as 40.30 hours. First, convert the 30 minutes to decimal hours (0.5). So, 40.5 × $20 = $810.
Freelance Billing
Freelancers, lawyers, and consultants who charge by the hour often need to convert their working time into decimal hours. For example, 1 hour and 30 minutes equals 1.5 hours, which makes it easier to calculate billable time and create invoices.
Aviation & Logistics
Flight times are often recorded in decimal hours. For example, 1 hour and 30 minutes can be written as 1.5 hours. Using decimal hours makes it easier to add, calculate, and track total flight time.