Time Calculator
Add or subtract time, determine future or past times, and compute elapsed durations directly in your browser.
Calculate Time Additions, Elapsed Durations, and Future Times Instantly
Free online time calculator to add, subtract, multiply, and divide hours, minutes, and seconds. Track work hours, timesheets, calculate future/past times, and convert durations to decimal hours instantly.
Select Calculation Mode
Choose between Future / Past Time, Elapsed Time, or Math (+ - × ÷) based on your needs.
Enter Time Values
Set base times, start and end points, or time values. Use quick presets or paste formatted text like 1:30 directly.
Review & Copy Converted Results
Results calculate in real time. Copy formatted hours and minutes, decimal hours, total minutes, or seconds with a single click.
Three Dedicated Modes
Handles future and past time lookups, intervals between two points in time, and multi-row arithmetic seamlessly.
Automatic Base-60 Carryover
Automatically handles 60-minute rollovers, preventing errors common with base-10 calculators.
Instant Decimal & Unit Conversion
Converts durations like 1h 45m into 1.75 decimal hours, 105 total minutes, and 6,300 seconds simultaneously.
Overnight & Midnight Spans
Detects night spans crossing midnight, computing accurate intervals even when the end time is numerically smaller.
Text Pasting & Multi-Row Math
Paste raw time strings like "1:30" or "45" into input fields and combine multiple time rows effortlessly.
Schedule & Arrival Planning
Find out what time a meeting will finish or how many hours remain before an upcoming event or departure.
Work Logs & Timesheet Conversion
Sum daily work hours and convert total time into decimal hours (e.g., 7.75h) for timesheets, attendance tracking, and billing.
Audio, Video & Multi-Row Editing
Add video clip lengths together or split total project time across team members without manual conversion.