What is an hours calculator?

This free online tool instantly finds the total hours and minutes between any start time and end time. It is used for calculating shift durations, payroll hours, night shift schedules, and study time. Simply enter two times and the tool shows the exact time difference. Our tool supports 12-hour format like 9am and 5pm, 24-hour format like 09:00 and 17:00, and all common time notations.

How many hours between 9am to 5pm?

There are exactly 8 hours between 9am and 5pm. This is the classic standard working day in most countries including the USA, UK, Canada, and Australia. In 24-hour format, this is calculated as 17 minus 9 which equals 8 hours, or 480 minutes total. If you take a 30-minute unpaid lunch break, your net working hours would be 7.5 hours. Use our working hours calculator to check any other shift combination instantly.

How many hours between 9am and 6pm?

There are exactly 9 hours between 9am and 6pm. This is a very common office hours schedule and retail shift in many industries. In 24-hour format, 18 minus 9 equals 9 hours, which is 540 minutes total. This is one of the most searched time calculations we handle.

How many hours between 10am to 7pm?

There are exactly 9 hours from 10am to 7pm. In 24-hour format this is 19 minus 10 which equals 9 hours, or 540 minutes. This shift is common in retail stores, restaurants, and service industries. Our hours calculator computes this and any other shift combination in seconds.

How do I calculate night shift hours?

To calculate night shift hours, enter your start time and end time in our hours calculator. The tool automatically detects overnight shifts when the end time is earlier than the start time, and adds 24 hours to get the correct result. For example, 10pm to 6am is automatically calculated as 8 hours. You do not need to do anything special — just enter the times and the working hours calculator handles overnight shifts correctly.

How many hours is 7pm to 7am?

There are exactly 12 hours from 7pm to 7am. This is a common 12-hour overnight shift in healthcare, security, manufacturing, and hospitality. In 24-hour format this is from 19:00 to 07:00 the next morning. Our night shift hours calculator handles this automatically without any special input needed.

How many hours is 10pm to 6am?

There are exactly 8 hours from 10pm to 6am. This overnight shift is common in manufacturing, logistics, security, and food service. In 24-hour format this is 22:00 to 06:00, spanning midnight. Our hours calculator detects this automatically and gives you 8 hours as the result instantly.

What time formats does this hours calculator support?

Our working hours calculator supports all common time formats: 12-hour with AM and PM like 10am, 7:30pm, 10:30 AM, and 4:40 PM; 24-hour format like 14:00 and 22:30; decimal notation like 10.30am; and shorthand like 10a or 7p. You can mix formats freely — entering the start time in 12-hour and the end time in 24-hour format works perfectly.

Is this hours calculator free?

Yes, this working hours calculator is completely free to use. There is no signup required, no account needed, no subscription, and no payment of any kind. All calculations happen instantly right in your browser. You can use it unlimited times for any work shifts, payroll, scheduling, school timetables, or general time duration calculations without any restrictions.

How do I calculate payroll hours with this tool?

To calculate payroll hours using our working hours calculator: first enter your shift start and end time to get total hours, then subtract any unpaid break time manually, then multiply the net hours by your hourly wage. For example, 9am to 6pm is 9 hours. If you have a 1 hour unpaid lunch, net hours are 8. At $20 per hour, your gross pay is $160. For weekly payroll, calculate each day separately and add the daily totals.

Does this calculator work on mobile phones?

Yes, our hours calculator is fully responsive and works perfectly on all devices including iPhones, Android smartphones, iPad tablets, and desktop computers. The large input fields and buttons are specifically optimized for touch screens. Results display clearly on any screen size. You can bookmark the page on your phone home screen for one-tap access to the working hours calculator anytime.

Do I need to download anything to use this calculator?

No, you do not need to download anything. Our hours calculator runs entirely in your web browser — no app installation, no software, no plugins required. Just open the page on any device and start calculating working hours instantly. It works on Windows, Mac, iOS, and Android without any downloads or installations.

How do I calculate overtime hours?

To calculate overtime using our working hours calculator: find your total daily or weekly hours, then identify hours beyond the standard. Daily overtime is any hours worked beyond 8 per day in most regions. Weekly overtime is any hours beyond 40 per week. For example, 9am to 7pm is 10 hours total, which means 2 hours of daily overtime at 1.5 times your regular pay rate.

Can students use this calculator for homework or studying?

Yes, students can absolutely use our hours calculator for studying and scheduling. Calculate how many hours you spent studying, how long a class runs, how much time is left before an exam, or how to divide study time between subjects. Just enter any two times and see the exact hours and minutes. Parents also use it to plan children's schedules and track study sessions.

Does the calculator save or store my data?

No, our working hours calculator does not save or store any of your data. All calculations happen locally in your browser and no information is ever sent to our servers. Your times and results are completely private. This is why no login or account is needed — there is nothing to save because everything is calculated instantly on your own device.

Hours Calculator – Find Working Hours & Time Between Any Two Times

⏱️ Shift Time Calculator

Type any time — results appear instantly as you type, no button click needed

Start Time 9am · 9:30am · 09:00 · 9.30am

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End Time 5pm · 17:00 · 6:45pm · 5.30pm

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—Hours

—Minutes

—Total Mins

⚡ Popular Shifts — Click to Calculate Instantly

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Common Shift Hours – Quick Reference

Click any combination below to auto-fill and calculate shift hours instantly:

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How to Calculate Hours Between Two Times

Find the exact time duration in under 30 seconds. Common calculations include 9am to 6pm hours (9 hours), 10am to 7pm (9 hours), and overnight shifts — all answered instantly:

Enter Your Start Time

Type your start time in any format — 9am, 9:30am, 09:00, or 9.30 AM. All common 12-hour and 24-hour formats are accepted automatically.

Enter Your End Time

Type your end time in any format — 5pm, 17:00, 6:45pm. For night shift schedules that cross midnight, just enter the times and the hours calculator handles overnight automatically.

Get Instant Results

Results update live as you type — showing total hours, minutes, and a full breakdown. No button press needed. Also works when you click Calculate.

Use Quick Picks or Common Combos

Click any popular shift like 9am to 5pm or 10pm to 6am for one-click results. Great for daily payroll and night shift scheduling.

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Why Use This Free Shift Hours Tool?

Everything you need to calculate hours between two times — built for speed, accuracy, and ease:

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Live Instant Results

Results update as you type — no button click needed. The fastest online time duration tool available.

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Night Shift Support

Calculates overnight shifts automatically. Our tool handles 10pm to 6am and all midnight-crossing times correctly.

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Any Time Format

12-hour (10am, 7:30pm), 24-hour (22:00), decimal (10.30am), shorthand (7p). Mix any formats freely — it all works.

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Payroll & Office Hours Precision

Perfect for payroll calculation. Shows hours AND minutes separately for accurate working hours payroll — multiply net hours by your hourly rate.

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Fully Mobile Responsive

Works perfectly on iPhone, Android, tablets, and desktop computers — optimized for every screen size.

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100% Free Forever

No login, no subscription, no limits. This time calculator is and always will be free.

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Who Uses This Free Time Tool?

Built for professionals and everyday users across all fields:

Employees & Workers — Calculate work shift hours for timesheets, verify payroll accuracy, and track overtime. Works for all standard and non-standard shifts in the USA, UK, Canada, and Australia.
HR Managers & Payroll Teams — Quickly calculate daily and weekly hours calculator results for each employee, manage shift rosters, and compute overtime pay.
Freelancers & Contractors — Track billable hours per project, calculate total work time for invoicing, and verify client time logs accurately.
Night Workers — Nurses, security guards, factory workers, and hospitality staff rely on our tool for overnight shifts like 7pm to 7am that cross midnight automatically.
Students & Parents — Calculate study session duration, class lengths, exam countdown, or children's activity schedules — any two times instantly.
Global Users — Available worldwide with no regional restrictions or login required.

Why Use Our Free Time Calculator

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Instant live results — Updates as you type. No page reload, no waiting required.

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All formats accepted — 12-hour, 24-hour, decimal, shorthand — any combination works perfectly.

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Overnight automatic — our hours calculator correctly handles 10pm to 6am as 8 hours without any extra steps.

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Minute-level precision — Shows hours, minutes AND total minutes separately for accurate payroll billing.

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No data stored — All calculations run in your browser. Zero data ever sent to our servers.

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Free forever — No hidden fees or subscription. Permanently free for everyone.

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FAQ – Common Questions About Shift & Working Time

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Explore More Free AgeCalcAI Tools

This tool is part of a complete suite of free time and productivity tools from AgeCalcAI:

🎂 Age Calculator 📱 iPhone Calculator Online ⏳ Countdown Timer 🎄 Days Until Christmas 🌍 Time Zone Converter 🕰️ How Long Ago Was 📐 Unit Converter 📝 Word Counter 🔐 Password Generator 🎲 Random Number Generator ⚡ Click Speed Test 💕 Love Compatibility

Written by Rajul Raturi — AgeCalcAI

This hours calculator was built by Rajul Raturi to answer common questions like "how many hours between 9am and 5pm" and "10pm to 6am night shift hours" with instant, reliable results. Whether for a standard 9-to-5 or an overnight shift, this free hours calculator and working hours tool has you covered. Always free.

Last Updated: August 30, 2026

Learn More About the Author →

Disclaimer: This free tool is provided for general time calculation and reference purposes. Results are calculated mathematically from the times entered. For legally binding payroll, labor law compliance, or professional time tracking, please verify results with a certified payroll specialist or HR professional. We do not collect, store, or share any data entered into this tool.

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