Time Unit Converter
Convert between units of time — seconds, minutes, hours, days, weeks and years.
Time across its units
Converting a span of time between units — how many seconds in a day, how many hours in a week, how many days in a stretch of years — comes up more than you would think, in planning, in code, in curiosity. This converts between the units of time, handling the awkward factors so you do not have to remember how many seconds are in an hour.
Enter a duration and see it in other units.
Where time stops being tidy
Small time units are clean — sixty seconds to a minute, sixty minutes to an hour — but the larger you go, the messier it gets. Months vary in length, years are not a whole number of days, and leap years exist to patch the gap, so any conversion involving months or years is an approximation unless you pin it to specific dates. For durations in seconds, minutes, hours, days and weeks the maths is exact; for months and years, treat the result as a close estimate, which is fine for most everyday purposes.
Questions & answers
How many seconds are in a day?
86,400 — the converter handles these awkward factors so you do not have to work them out.
Why are month and year conversions approximate?
Because months vary in length and a year is not a whole number of days, so anything involving them is an estimate unless tied to specific dates.
Is anything uploaded?
No. The conversion happens in your browser.