How the calculators handle tricky cases, what happens to your data, and where the accuracy limits are.
It depends on the question. For a full week with clock in/out and breaks, use the Time Card Calculator. For a quick "how long was that shift," use the Hours Calculator. The homepage directory lets you search by what you're trying to figure out, and each calculator's page explains what it's for.
No. Every calculator works immediately with no sign-up, no email address, and no installation.
Yes. Every calculator is responsive and works the same way on a phone, tablet, or desktop browser.
If the end time is earlier than the start time — for example, 9:00 PM to 5:00 AM — the calculator treats it as an overnight shift and adds 24 hours to the end time before calculating the duration. A 9 PM to 5 AM shift correctly comes back as 8 hours.
Midnight is treated as 00:00 and noon as 12:00, using the standard 24-hour clock behind the scenes, so there's no ambiguity between 12 AM and 12 PM.
The calculator flags it as an error and asks you to fix it. A break can't be equal to or longer than the shift it's inside.
The Time Card, Timesheet, and Weekly Time calculators include a "Download CSV" button that saves your results as a spreadsheet-ready file you can open in Excel, Google Sheets, or similar.
No. Every calculation runs in your browser. Nothing you type into a calculator is transmitted to a server or stored by Hourlyfy.
No — calculators don't currently save your entries between visits. Export a CSV before you close the tab if you want to keep a copy.
The arithmetic — hours, overtime splits, and pay from the rate and hours you provide — is accurate. What the calculators don't know is your local labor law, your company's specific overtime policy, or your tax withholding, so treat pay figures as estimates.
It's a common overtime convention in the United States, used here only as a sensible starting point. You can change both the regular-hours threshold and the multiplier on any calculator that uses them.
Use it alongside your payroll software, not instead of it — as a fast way to check a number or work something out before it goes into a system of record. See our disclaimer for the full picture.
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