Time to Decimal Calculator
Convert HH:MM to decimal hours instantly — or go the other way. Built for payroll, timesheets, and billable hours, with DOL 7-minute rounding, clock-in/out support, and a full conversion chart.
Tip — Press Enter to recalculate, type 7.45 as a shortcut for 7:45.
Looking for a multi-day version? Use the timesheet calculator.
Specialized calculators for every workflow
Each tool below is built on the same engine but optimized for one task. Pick the one that matches what you actually need to do.
Timesheet Calculator
Fill in 7 rows of clock-in / clock-out, get weekly decimal totals and CSV export.
Open timesheet →Payroll Time Converter
Decimal hours × hourly rate, with FLSA-compatible rounding presets and DOL 7-minute rule.
Calculate pay →Time Card Calculator
Punch-in / punch-out with lunch deduction; handles cross-midnight shifts.
Open time card →Minutes to Decimal
Just have a minute count? Convert any number of minutes to decimal hours instantly.
Convert minutes →Decimal to Time
Reverse direction: 7.75 → 7:45. Useful when payroll exports come in decimal format.
Reverse convert →Hours to Decimal
Two boxes — hours and minutes. Best on mobile when you don’t want a colon.
Open hours tool →Military Time Converter
24-hour ↔ 12-hour ↔ decimal hours, three-way conversion in a single panel.
Convert military time →Minutes to Decimal Chart
Full 1–59 minute reference table, printer-friendly for payroll departments.
View chart →How do you convert time to decimal hours?
The math is straightforward: divide the minutes by 60 and add to the hours. The same logic works for seconds (divide by 3600). Where it gets tricky is rounding for payroll — which is exactly what this calculator handles for you.
-
Identify the hours and minutes
Take any time written as
HH:MM. For example,7:45means 7 hours and 45 minutes. -
Divide minutes by 60
Convert minutes into a fraction of an hour:
45 ÷ 60 = 0.75. If you also have seconds, divide them by 3600 and add.Common mistake: dividing by 100 instead of 60 — that’s the most frequent payroll error we see. -
Add the result to the hours
7 + 0.75 = 7.75decimal hours. That’s your answer. -
Apply your payroll rounding rule (if needed)
If you bill in quarter hours, round to the nearest 0.25. If your employer follows the FLSA, use the DOL 7-minute rule — the calculator’s built-in preset handles this automatically.
Common conversions at a glance
A quick peek — the full 1–59 chart covers every minute, and the hours chart goes up to 12:59.
| Minutes | Decimal | Time (HH:MM) | Decimal hours |
|---|---|---|---|
| 5 | 0.083 | 1:00 | 1.00 |
| 10 | 0.167 | 1:15 | 1.25 |
| 15 | 0.250 | 1:30 | 1.50 |
| 20 | 0.333 | 1:45 | 1.75 |
| 25 | 0.417 | 2:00 | 2.00 |
| 30 | 0.500 | 4:30 | 4.50 |
| 40 | 0.667 | 7:30 | 7.50 |
| 45 | 0.750 | 7:45 | 7.75 |
| 50 | 0.833 | 8:00 | 8.00 |
| 55 | 0.917 | 8:30 | 8.50 |
Where is decimal time actually used?
Most U.S. payroll, accounting, and project-management systems prefer decimal hours because they multiply cleanly. Here’s where you’ll bump into them in real life.
Payroll & HR processing
ADP, Gusto, Paychex, QuickBooks Payroll — almost every U.S. payroll engine consumes decimal hours so it can multiply by hourly rate, overtime multiplier, and tax rate without integer math errors.
8.25 hours × $20.00/hr = $165.00
Timesheets & time tracking
Apps like Clockify, Toggl, and Harvest store every entry in decimal so weekly totals add up correctly. Our timesheet calculator mirrors that workflow.
Freelance & agency billing
Hourly billing rates assume decimal time. A 1-hour 30-minute meeting is 1.5 billable hours, not 1.30. See the billable hours guide.
Project budgets & estimates
When you say a feature will take “forty-eight hours,” you mean 48.0 decimal hours, not 48:00 on a clock. Decimal makes capacity planning math possible.
Frequently asked questions
What is 7:45 in decimal?
7:45 equals 7.75 decimal hours. The 45 minutes are 45 ÷ 60 = 0.75 of an hour, added to the 7 full hours. This is the standard format used in payroll, timesheets, and project billing.
What is 1:30 in decimal hours?
1:30 equals 1.5 decimal hours. Thirty minutes is exactly half an hour: 30 ÷ 60 = 0.5, added to 1 full hour.
What is the DOL 7-minute rule?
Under the U.S. Fair Labor Standards Act, employers may round timesheet entries to the nearest quarter-hour as long as the rounding does not consistently disadvantage employees. Punches within the first 7 minutes of a 15-minute interval round down; punches at 8 minutes or later round up. Use the DOL 7-min preset above to apply it automatically. Read the full guide.
Should I use 0.25 or DOL 7-min for payroll?
The two are similar but not identical. 0.25 (quarter hour) is plain rounding to the nearest 15 minutes. DOL 7-min uses the FLSA-defined breakpoint at the 8-minute mark within each 15-minute window, which is what U.S. wage-and-hour auditors expect to see. If you process U.S. payroll, choose DOL 7-min.
Does this calculator save my data?
No. All calculations run in your browser. Nothing is sent to a server. Your most recent inputs may be remembered locally so you can refresh the page without losing them.
Can I share my calculation with a coworker?
Yes — click Share link and the calculator copies a URL that pre-fills the same inputs and rounding mode. Anyone who opens the link sees the identical result.
How do I convert decimal hours back to HH:MM?
Switch the calculator to Decimal → Time at the top, or open the dedicated decimal-to-time tool. Math: multiply the decimal portion by 60 to get minutes. Example: 7.75 → 0.75 × 60 = 45 → 7:45.
What about cross-midnight shifts?
The Clock-in / Clock-out mode handles overnight shifts automatically. If your clock-out time is earlier than your clock-in (for example, 22:00 → 06:00), the calculator treats it as the next day and returns 8 hours.
