Calculate time differences and add or subtract time instantly in your browser.
Calculate time differences and add or subtract time instantly in your browser.
Add or subtract time durations. Input fields can be left blank (treated as 0).
Add or subtract days, hours, minutes, or seconds from a specific date and time.
💡 Pro Tip: Use the "Current Time/Date" buttons for quick calculations starting from now.
Learn how to convert between time units including seconds, minutes, hours, days, and more.
Complete guide to calculating hours, minutes, and time differences.
Master date and time calculations with our comprehensive guide.
| Related tool | Use this tool when | Use related tool when |
|---|---|---|
| Time Duration Calculator | Adding clock times | Measuring elapsed time between two timestamps |
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Enter the time values you want to add — for example, 2 hours 45 minutes and 1 hour 30 minutes — and the calculator adds them and returns the result (4 hours 15 minutes). You can chain multiple time values. The calculator automatically carries over: 75 minutes becomes 1 hour 15 minutes, and 90 seconds becomes 1 minute 30 seconds. This is useful for adding up timesheet entries, combining audio or video clip durations, totaling work shifts, or any situation where you need to sum multiple time intervals without doing the carry-over arithmetic manually.
Switch to "Time Difference" mode, enter the start time and end time, and the calculator shows the elapsed duration in hours, minutes, and seconds. For example, 8:45 AM to 5:30 PM is 8 hours 45 minutes. The tool handles times that cross midnight — if your start time is 10:30 PM and your end time is 6:15 AM, it correctly calculates the 7 hour 45 minute difference without you needing to mentally adjust for the day boundary. This is particularly useful for shift workers, nurses, overnight staff, and anyone tracking work hours that span midnight.
Yes. Enter your clock-in and clock-out times for each day and add them together to get weekly total hours. For example, Monday 8h 30m + Tuesday 7h 45m + Wednesday 9h 0m + Thursday 8h 15m + Friday 8h 30m = 42 hours 0 minutes. Multiply by your hourly rate to get gross pay. For payroll that rounds to the nearest quarter-hour, round each entry to 0, 15, 30, or 45 minutes before entering. For detailed payroll tracking with automatic calculations across multiple days, also see our Timesheet Calculator which formats results as a payroll-ready report.
Divide the minutes by 60 and add to the whole hours. For example, 2 hours 45 minutes = 2 + (45/60) = 2.75 hours. This decimal form is required for many payroll systems and billing software that store time as a decimal number. Common conversions: 15 minutes = 0.25 hours, 30 minutes = 0.5 hours, 45 minutes = 0.75 hours. The time calculator shows both the hours:minutes:seconds format and the decimal hours equivalent so you can copy either format into your payroll or billing system without manual conversion.
The calculator accepts both 12-hour (AM/PM) and 24-hour (military) time formats. For 12-hour input, type "2:30 PM" or select AM/PM from the toggle. For 24-hour input, type "14:30". The tool converts between formats automatically. When calculating time differences that cross noon (for example, from 10:30 AM to 3:45 PM), the calculator handles the AM-to-PM transition correctly. If you're used to 24-hour time, you can set the display to 24-hour format and all inputs and outputs will use that convention.
Yes. Time calculators are widely used in video editing to sum clip durations, calculate project total length, and plan episode or film running times. Enter individual clip times and sum them to get total duration. For example, adding 3m 22s + 1m 45s + 2m 10s + 0m 58s gives 8m 15s total. This also works for podcast episode planning, audio mixing, playlist timing, and any scenario where you need to add durations accurately. The seconds field ensures precision that rounding to full minutes would lose.
A clock time (or timestamp) specifies a point in time — like 3:30 PM or 14:30. A duration specifies how long something lasts — like 2 hours 45 minutes. They look similar but mean different things. Adding two durations gives a new duration (2h 30m + 1h 45m = 4h 15m). Adding a duration to a clock time gives a new clock time (2:30 PM + 3 hours = 5:30 PM). This time calculator handles both modes: "add two durations" and "find the clock time after adding a duration to a start time". Select the appropriate mode for your use case.
Yes — 100% free with no account required, no usage limits, and no data uploaded anywhere. All time calculations run locally in your browser. You can add, subtract, and compare times as many times as you need without any restrictions. The tool is funded by non-intrusive advertising so the core functionality will always remain free. Bookmark it for quick access whenever you need to add hours and minutes or calculate elapsed time.
Calculations run locally in your browser; times are not uploaded.
For payroll, compliance, or legal hour totals, verify with your official system—not this duration arithmetic tool.
Part of Date & Time Tools
More free tools for the same workflow.
Convert seconds, minutes, hours, days, weeks, and years instantly with live multi-unit calculations and accurate results.
Add or subtract days, weeks, months, or years from any date. Days-between mode included. No upload—runs locally in your browser. Free, no signup.
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Reviewed by EverydayTools Editorial Team.