About the product
A focused tool for changing duration formats
Time in Decimal helps people move between hours-and-minutes notation and decimal hours without an account, upload, or hidden workplace rule.
What it is for
The site supports single values, pasted lists, local TSV and CSV output, a 0–60 minute chart, and spreadsheet formulas. It treats every value as a non-negative duration. An hour field can exceed 24 because a duration is not a time of day.
Calculation method
Time inputs first become an integer number of seconds. Decimal display is then derived from that exact integer fraction and rounded half up only at the selected display precision.
Decimal-hour inputs are parsed as a scaled integer rather than a binary floating-point number. After multiplication by 3,600, any fractional second is rounded half up to the nearest second. This keeps values such as 1.001 from acquiring an accidental floating-point error before the final result is chosen.
Deliberate limits
The tool does not calculate pay, tax, overtime, breaks, PTO, invoices, clock-in and clock-out intervals, or employee records. It does not decide which time is payable, billable, regular, overtime, or legally compliant. Those decisions depend on separate agreements, systems, and applicable rules.
Supported values are non-negative and no larger than 999,999 hours. Strict validation rejects malformed values instead of silently normalizing them; for example, 2:75 is an error rather than an automatic 3:15.