Free Time Duration Calculator 2026 to calculate the exact time difference between two times in hours, minutes and seconds instantly.
The calculator measures the exact difference between your start and end times by computing the interval in hours, minutes, and seconds. Both times are automatically aligned to the same selected timezone, ensuring consistent and accurate results. Decimal hours are derived by converting remaining minutes into fractional parts—for example, 45 minutes equals 0.75 hours. All calculations run instantly in your browser without any processing delays.
The circular charts on this page provide a visual representation of how your calculated time duration fits within a 24-hour day. Each chart is synchronized with the numeric results displayed above, allowing you to see both the detailed breakdown and the proportional comparison at a glance. On smaller mobile screens, the charts may appear lower on the page and require scrolling to view—this is normal behavior and ensures the interface remains clear and readable on all devices.
When both your start and end times are set to the same timezone, any timezone offsets automatically cancel out, ensuring calculation accuracy regardless of your location. Selecting the correct timezone from the dropdown is essential for consistent and error-free results. The calculator automatically handles overnight and cross-day durations, properly accounting for time periods that span midnight or extend across multiple calendar dates without requiring manual adjustment.
This tool is designed for:
All time duration calculations are performed locally within your browser using standard JavaScript computation. No time data, personal information, or calculation results are stored on our servers or transmitted over the internet. Your results remain completely private and session-based—they are only retained in your browser's memory and are automatically cleared when you close the page or browser tab.
This Time Duration Calculator is developed and maintained by the VIP Calculator Team using standard time difference and duration calculation methods that are widely used in scheduling, workforce planning, and productivity tools.
The calculator applies universally accepted rules for:
Privacy: All calculations run locally in your browser. No personal time data is stored, saved, or shared.
Intended Use: This tool is intended for informational and planning purposes only. It does not provide legal, payroll, or medical advice.
Last updated: December 2025
Important Note
This calculator provides accurate time duration calculations for general planning, productivity tracking, and billing purposes. For critical payroll or legal time tracking, always verify calculations with your organization's official time management system. Timezone calculations assume standard time without DST adjustments.
Enter the start time (e.g., 11:00 PM) and end time (e.g., 7:00 AM), and the calculator will automatically calculate the duration across midnight.
You can use either 12-hour format with AM/PM or 24-hour military time format.
Calculate the total duration first, then subtract break time separately to get net working hours.
The calculator provides precise decimal conversions, useful for payroll systems that require decimal hour format.