---
title: "Time duration calculator with decimal hours"
description: "Free time duration calculator. Enter a start time, an end time and any break, and get the time worked in hours and minutes and in decimal hours."
canonical: "https://www.meadowdesk.com/tools/time-duration-calculator"
last_modified: "2026-10-27"
---

# Time duration calculator

Source: https://www.meadowdesk.com/tools/time-duration-calculator

Free time duration calculator. Enter a start time, an end time and any break, and get the time worked in hours and minutes and in decimal hours.

Enter when you started, when you stopped and any break, and get the time worked in hours and minutes, decimal hours and total minutes.

## How to use it

1. Enter the time you started.
2. Enter the time you stopped. If it’s earlier than the start, the calculator counts through midnight.
3. Add any break in minutes, like lunch.
4. Copy the decimal hours onto your timesheet or invoice.

## Time duration calculator FAQ

**How do I turn hours and minutes into decimal hours?**
Divide the minutes by 60 and add them to the hours: 2 hours 45 minutes is 2 + 45 ÷ 60 = 2.75. Six minutes is 0.1 of an hour, which is why many freelancers bill in six-minute steps.

**Does it work past midnight?**
Yes. If the end time is earlier than the start, it counts through midnight, so 10pm to 1am is 3 hours. It handles one stretch of up to 24 hours at a time.

**Should I bill my breaks?**
No. Take lunch and other breaks off before you bill. If you took several short ones, add them together and enter the total as one break.

**Should I round my time?**
Many freelancers round each entry to 6 or 15 minutes. Whichever you choose, round the same way every time and say so in your contract, so the client knows how they are billed.

**How do I add up a whole week?**
Work out each stretch here, then total the decimal hours. The [billable hours calculator](https://www.meadowdesk.com/tools/billable-hours-calculator) adds a week of entries at your rate and shows what to invoice.