What is Work Hours Calculator?
A Work Hours Calculator helps you sum total worked hours from multiple time intervals, deduct breaks, apply overtime rules (daily/weekly thresholds), and optionally estimate gross pay with overtime premiums. Unlike simple timers, this calculator handles complex scenarios like split shifts, irregular schedules, and varying overtime policies.
Target Users:
- Freelancers: Track billable hours across multiple client sessions
- Shift Workers: Manage irregular schedules with breaks and overtime
- Payroll Clerks: Verify timesheet accuracy before processing
- Remote Contractors: Calculate invoices with precise hour tracking
- Managers: Review employee hours for compliance and budgeting
Key Benefits: Accurate hour totals, automatic overtime calculation, pay estimation, export-ready timesheets, and 100% privacy (all calculations local).
How It Works
1. Add Time Intervals
Enter start time (HH:MM) and end time for each work period. Add break minutes to automatically deduct from net hours. Example: 09:00-17:00 with 30m break = 7.5h net.
2. Configure Overtime
Enable daily threshold (e.g., 8h/day) or weekly threshold (e.g., 40h/week). Set multiplier (default 1.5x). Hours beyond threshold count as overtime.
3. Optional Pay Calculation
Enter hourly rate and currency (USD, EUR, GBP, etc.). Calculator shows regular pay, overtime pay (at multiplier rate), and total pay estimate.
4. View & Export Results
See total net hours in HH:MM and decimal format. View regular/overtime split. Copy summary or export CSV for timesheet records.
Common Use Cases
Freelance Billing & Invoice Preparation
Track billable hours across multiple client sessions throughout the day. Add breaks to exclude non-billable time. Export CSV for invoice attachments.
Shift Tracking for Irregular Schedules
Handle split shifts (morning + evening), on-call periods, and flexible work arrangements. Daily overtime ensures compliance with labor laws.
Payroll Preparation & Verification
Verify employee timesheets before payroll processing. Identify overtime automatically. Ensure accurate pay calculations.
Labor Law Compliance Monitoring
Monitor daily and weekly hour limits. Track overtime for compliance with local regulations. Generate reports for audits.
Project Budgeting & Cost Estimation
Estimate labor costs for projects. Calculate total hours for budget planning. Track actual vs estimated hours.
Privacy & Data Security
100% Local Processing: All calculations performed in your browser using JavaScript. No timesheet data sent to servers. No account required. No tracking cookies.
Export Control: Manual CSV export puts you in control of your data. Share or backup as needed.
Your work hours, pay rates, and personal information remain completely private. The calculator operates entirely offline after page load.
Frequently Asked Questions
How are overtime rules applied?
Daily Overtime: Splits hours beyond daily threshold (e.g., >8h/day). Each day's hours compared individually to threshold.
Weekly Overtime: Counts total hours beyond weekly limit (e.g., >40h/week). Aggregates all intervals for week total.
You can enable both rules simultaneously. Daily overtime takes precedence for per-day calculations.
How are breaks handled?
Break minutes are deducted from each interval's raw duration to calculate net worked time. Example: 09:00-17:00 (8h raw) with 60m break = 7h net.
All breaks in this calculator are considered unpaid deductions. For paid breaks, include them in work time (don't add as separate break).
Can I use this for billing clients?
Yes. The calculator provides accurate hour totals and optional pay estimates. Export CSV for timesheet records or copy summary for invoices.
Verify final billing with your contract terms. Calculator estimates are for planning purposes.
What currencies are supported for pay calculation?
USD, EUR, GBP, JPY, CAD, AUD. Pay calculation is an estimate - verify with your actual contract terms and local tax regulations.
How does overtime multiplier work?
The multiplier (default 1.5x) is applied to overtime hours only. Example:
- 8h regular at $20/hr = $160
- 2h overtime at $20/hr × 1.5 = $60
- Total pay = $220
Can I track multiple days?
The current version focuses on single-day or aggregated intervals. For multi-day tracking, calculate each day separately and sum totals.
Future versions may support multi-day entry with automatic weekly aggregation.
What's the maximum hours I can enter?
Each interval must be valid (End > Start) and less than 24 hours. Break minutes must be less than interval duration.
For extremely long work periods (>24h), split into multiple intervals across days.