⏱️ Time Calculator

What is a time calculator?

A time calculator handles arithmetic on durations and clock times — adding two durations together, subtracting one from another, finding the elapsed time between a start and an end, or totaling a list of durations. Doing this in your head or on paper is error-prone (60 minutes per hour, 60 seconds per minute, midnight wrap-around). A dedicated calculator gives you the right answer instantly in HH:MM:SS, total seconds, total minutes, and decimal hours.

When to use Time Calculator

Common use cases: tracking billable hours from a list of time entries, calculating shift durations from clock-in to clock-out, summing video lengths for editing, finding total lap times in a race, comparing times in athletics, planning travel times, computing render or compile durations, and any task where multiple time values need to be combined.

Three modes in one tool

Add / Subtract: combine two durations with + or −. Between times: enter a start and end clock time and get the elapsed duration (handles overnight wrap-around). Total list: add as many durations as you need and get the grand total — useful for timesheets, edit lists, and itinerary planning.

Why use FileTools Time Calculator?

✅ Free — no signup, no spam
✅ 100% private — runs in your browser
✅ Three modes covering 99% of time arithmetic
✅ Result shown in HH:MM:SS, seconds, minutes, and decimal hours
✅ Forgiving input format — accepts HH:MM:SS, MM:SS, or plain seconds
✅ Instant updates as you type

Frequently Asked Questions