Free Time Calculator
Calculate time difference, add/subtract time, and convert work hours to decimal. Perfect time clock calculator for tracking employee hours and time card calculations.
Configure
Select start and end times
Results will appear here instantly
Configure
Configure time settings
Result will be shown here
How to Use
- 1Calculate Difference: Enter start and end times to calculate exact duration.
- 2Add/Subtract Time: Choose a base time, select operation, enter duration.
- 3Quick Presets: Use preset buttons for common calculations.
Who Uses Our Time Clock Calculator?
Time Clock Users
Track employee clock-in and clock-out times for accurate payroll. Perfect as a digital time clock calculator for small businesses.
HR Managers
Calculate time card hours for payroll processing. Essential time card calculator for accurate employee compensation.
Video Editors
Calculate total duration of combined clips and plan video pacing.
Travelers
Calculate flight durations and coordinate across time zones.
Students
Plan study schedules and calculate exam durations.
Freelancers
Track billable hours accurately for invoicing.
Employees
Calculate overtime and track schedules using our work time calculator.
Project Managers
Plan timelines and estimate durations.
Time Clock & Time Card Calculations
Master the fundamentals of time math for accurate work hour tracking and payroll calculations.
Adding Time
When adding hours and minutes, remember that 60 minutes = 1 hour.
Subtracting Time
Work backwards when subtracting time spans.
Crossing Midnight
Add 24 hours to the end time when crossing midnight.
How to Calculate Time Manually
Understanding the math helps verify your time clock calculator results.
Add Minutes First
If the sum ≥ 60, subtract 60 and add 1 to hours.
45 + 30 = 75 → 15m + 1h Add Hours Second
Include any carried hours from the minutes step.
2 + 3 + 1 = 6 hours Convert if Needed
For decimal format, divide minutes by 60.
15 ÷ 60 = 0.25 Converting to Decimal for Payroll
4 hours 15 minutes = 4 + (15÷60) = 4.25 hours
Time Format Conversions
Essential reference for time card calculator users and payroll processing.
Clock to Decimal
Common Conversions
⚠️ Why This Matters for Payroll
Freelancers and hourly workers need accurate decimal conversion for invoicing. If you worked 7 hours and 36 minutes, that's 7.6 hours, not 7.36 hours!
Real-World Time Scenarios
See how our work time calculator handles everyday situations.
Work & Business
Time Card
Travel
Health
Study
Frequently Asked Questions
How do I calculate time across midnight?
Our calculator automatically handles midnight crossing. When you enter a start time after the end time (like 11:00 PM to 2:00 AM), it assumes the end time is the next day.
Can I add weeks or months?
Yes! In the Add/Subtract tab, you can add days (7 days = 1 week, 30 days ≈ 1 month). Use the Quick Presets for common durations like +1 Week or +1 Month.
Is this calculator accurate?
Absolutely. We use date-fns, a professional JavaScript library trusted by millions of developers worldwide. All calculations are precise to the second.
How do I convert time to decimal for payroll?
Divide the minutes by 60. For example, 7 hours 30 minutes = 7 + (30÷60) = 7.5 hours. Our calculator shows calculations but the conversion table above helps too.
Can I calculate business days only?
Currently, our calculator shows total days. To exclude weekends, subtract 2 days for each full week in your duration. We're working on an auto-exclude-weekends feature!
What if I need to calculate time zones?
For time zone calculations, you'll need our Time Zone Converter tool (coming soon). This calculator works with times in the same time zone.
How far in the future can I calculate?
You can add up to years in the future! The tool handles dates far beyond typical calendar limits, perfect for long-term project planning.
Can I save my calculations?
Your last calculation may stay in your browser temporarily, but for permanent records, we recommend copying the result to your notes.
Can I use this as a time clock calculator?
Yes! Enter your clock-in time (e.g., 9:00 AM) and clock-out time (e.g., 5:30 PM) to calculate total work hours. This time clock calculator is perfect for timesheet management and tracking employee hours.
How do I calculate my time card hours?
Enter your start time (clock in) and end time (clock out). For breaks, subtract the break duration from the total. Example: 8 hours - 30 min break = 7.5 billable hours. Our time card calculator handles this automatically.
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