About TimeDecimal

What TimeDecimal is

TimeDecimal is a small set of free calculators for turning hours and minutes into decimal hours and back, totalling timesheets and projecting PTO. It exists because decimal hours trip people up: 8:30 is not 8.30, and every payroll or invoice system seems to round a little differently.

Principles

• Private. Every calculation runs in your browser. The numbers you type are never sent to a server. See the privacy page.
• Free and simple. No accounts, no sign-up walls, no downloads.
• Tested maths. The conversion, rounding, timesheet and PTO logic is plain code covered by automated tests, including awkward cases such as minutes of 60 or more, overnight shifts and values that sit exactly halfway between two rounding steps.
• Explained. Each tool shows the formula and a worked example so you can check the answer by hand.

How rounding works here

When a time sits exactly halfway between two rounding steps, it rounds up. For example 8:07:30 becomes 8:15 under quarter-hour rounding. The quarter hour rounding chart shows every minute and the minutes to decimal chart lists the conversions.

Limits

These tools are not payroll software and do not give legal or financial advice. They do not apply overtime rules, tax, or employer-specific policies such as accrual caps. Always check results against your employer's official records before relying on them for pay, billing or compliance.

Find a mistake?

If a result looks wrong, the quickest way to help is to note the input, the rounding mode you chose and what you expected. Corrections are welcome.