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Time

Time Unit Converter

Convert seconds, minutes, hours, days, weeks, months, and years using clearly stated assumptions.

ToolEnter your information below
Result24 hours
Formula
1 × 86,400 ÷ 3,600
From basis
Exact duration
To basis
Exact duration

Milliseconds through weeks are fixed durations. Months use 30.436875 days and years use 365.2425 days (the 400-year Gregorian mean); decades and centuries scale that mean. Use a date calculator for calendar-exact months or years.

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How this tool works

Milliseconds through weeks use fixed duration factors. Months, years, decades, and centuries use the 400-year Gregorian mean of 365.2425 days per year and are explicitly labeled as averages.

Limits to know

Milliseconds through weeks use fixed factors. Months, years, decades, and centuries use the stated Gregorian mean rather than calendar-exact intervals. Do not use average units for legal deadlines or date arithmetic.