Time Tools · Payroll & Billing
Hours to Decimal CalculatorConvert hours and minutes into decimal hours in seconds.
Enter your hours and minutes and instantly see the decimal equivalent — ready to drop into timesheets, invoices, and payroll software.
Results update live. No button required.
Example · 7 hours 30 minutes
7.50
decimal hours
30 ÷ 60 = 0.50 — add to 7 to get 7.50
÷ 60
is all you need — divide minutes by 60 then add to your hours
0.75
is 45 minutes in decimal — the most common billing conversion
2 secs
to get your answer — no maths, no spreadsheet formula
Decimal hours are rounded to 2 decimal places. Results update live as you type.
Most payroll software and invoicing tools expect decimal hours — enter 1.75, not 1:45.
What this means for you
HH:MM looks readable but breaks the moment you need to do maths on it. Decimal hours fix that in one step.
Invoice accurately
2h 20m billed at $120/hr. In HH:MM you can't multiply directly. In decimal: 2.33 × $120 = $279.60. Exact, every time.
Fill timesheets correctly
Xero, QuickBooks, Harvest, and most HR platforms expect decimal input. 1 hour 45 minutes goes in as 1.75 — not 1:45.
Sum hours in spreadsheets
Adding decimal hours is instant: 1.5 + 2.75 + 3.25 = 7.50. HH:MM requires custom formulas and still trips people up.
How it works
One formula. Three steps. Done.
Enter your hours
Type in the whole number of hours. 3 hours is simply 3.00 in decimal. Nothing to convert yet.
Enter your minutes
Add the minutes (0–59). The calculator divides them by 60 instantly — 30 min becomes 0.50, 45 min becomes 0.75.
Read your decimal
The two are added together and displayed. Copy it straight into your timesheet, invoice, or spreadsheet.
What you can do next
Once you have your decimal hours, here’s how to put them to use.
Calculate your pay
Multiply decimal hours by your hourly rate. 2.75 hours at $80/hr = $220. Exact to the penny — no rounding arguments.
Add up your week
Convert each day's time to decimal, then sum them. 1.5 + 2.75 + 3.25 + 4.0 + 6.5 = 18.00 hours for the week.
Check for overtime
Compare your total decimal hours against your overtime threshold (typically 40h). The maths is instant when everything is in decimal.
How to convert hours and minutes to decimal
Converting time to decimal is a single-step calculation: divide the minutes by 60 and add the result to the whole hours. For example, 3 hours 45 minutes becomes 3 + (45 ÷ 60) = 3 + 0.75 = 3.75.
The reason this matters is that most software — payroll platforms, invoicing tools, and spreadsheets — treats time as a regular number. You can’t multiply 2:30 by a pay rate. But you can multiply 2.5 by anything. Decimal hours are the bridge between how we read clocks and how computers do maths.
Minutes to decimal — quick reference
The four most common quarter-hour values come up constantly in billing and payroll. Memorise these and you’ll rarely need a calculator:
| Minutes | Decimal |
|---|---|
| 5 min | 0.08 |
| 10 min | 0.17 |
| 15 min | 0.25 |
| 20 min | 0.33 |
| 25 min | 0.42 |
| 30 min | 0.50 |
| 35 min | 0.58 |
| 40 min | 0.67 |
| 45 min | 0.75 |
| 50 min | 0.83 |
| 55 min | 0.92 |
| 60 min | 1.00 |
Why decimal hours matter for freelancers and payroll
If you bill by the hour, getting decimal conversion right directly affects your income. Rounding 2 hours 40 minutes to “2.5” instead of the correct 2.67 loses 10 minutes of pay every time. At $100/hr, that’s $16.67 per entry. Over a month of daily billing, that adds up quickly.
For payroll departments, the same logic applies in reverse. Overpaying by consistently rounding up minutes can add thousands to annual payroll costs for larger teams. Accurate decimal conversion — especially for overtime calculations where even a few minutes can tip someone into a higher pay band — protects both sides.
Frequently asked questions
What is 45 minutes in decimal hours?
45 minutes is 0.75 decimal hours. Divide 45 by 60 to get 0.75. So 1 hour 45 minutes = 1.75, and 2 hours 45 minutes = 2.75.
How do you convert time to decimal hours?
Divide the minutes by 60 and add to the hours. For example: 3 hours 20 minutes → 20 ÷ 60 = 0.333 → 3 + 0.333 = 3.33 decimal hours.
Why use decimal hours for payroll?
Payroll systems multiply hours by an hourly rate to calculate pay. This only works with decimal numbers. 1h 30m can't be directly multiplied — 1.5 can. Most payroll software expects decimal input.
What is 30 minutes in decimal?
30 minutes = 0.50 decimal hours. 30 ÷ 60 = 0.5. So 2 hours 30 minutes = 2.50 decimal hours.
How many decimal hours is 15 minutes?
15 minutes = 0.25 decimal hours. 15 ÷ 60 = 0.25. Quarter-hour increments are very common in billing: 0.25, 0.50, 0.75, 1.00.
Can I convert decimal hours back to minutes?
Yes — multiply the decimal part by 60. For example: 2.75 hours → 0.75 × 60 = 45 minutes → 2 hours 45 minutes.
Results are rounded to 2 decimal places. For payroll or legal purposes, verify calculations with your employer or payroll provider.