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Accurately convert between years, weeks, days, hours, minutes, seconds, milliseconds, microseconds, and nanoseconds with custom decimal precision.
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
This converter takes one numeric duration and one source unit, then lists its equivalent in the other supported units: seconds, milliseconds, minutes, hours, days, weeks, months, and years. Seconds are the common base: convert the input to seconds, then divide by the target unit’s seconds factor. In symbols, target value = input value × input seconds per unit ÷ target seconds per unit.
The second is the SI base unit for time. The BIPM lists the familiar fixed relationships: a minute is 60 seconds, an hour is 3,600 seconds, and a day is 86,400 seconds. This tool also defines a week as seven days. These fixed-duration relationships make conversions such as 90 minutes to 1.5 hours straightforward.
A calendar month can have different lengths, so the converter assigns it a fixed value of 2,628,000 seconds (30.4167 days). A year is fixed at 31,536,000 seconds (365 days). Those are configured conversion factors, not calendar arithmetic. For instance, converting one month to days returns about 30.4167 days; it does not ask which month or start date you mean. A leap year, month-end rule, or time zone does not change the calculation.
For applications where a calendar date matters—such as “one month after January 31” or the number of local hours between two appointments—use date and time arithmetic with the relevant start date and time zone. A duration converter answers a different question: how many fixed units represent the same quantity of elapsed time?
Guide
Follow the workflow and verify inputs and outputs with practical examples.
Enter a number in the value field. Decimals are accepted; the field is parsed as a numeric value.
Select the unit that describes the value you entered, such as hours or milliseconds.
Choose the displayed decimal precision. Available choices are 0, 1, 2, 3, 4, 5, 6, 8, or 10 places.
Read the list of equivalent units. Each result is rounded for display, with trailing zeros removed. Select a result row to make that unit the new input unit, or use its copy control to copy the shown number.
For 2.5 hours, the fixed factors give 2.5 × 3,600 = 9,000 seconds. That is 540,000 milliseconds, 150 minutes, about 0.1042 days, and about 0.0149 weeks. At four decimal places, the year result is 0.0003 because the converter uses 365 days per year. The displayed values may be rounded; the selected precision controls presentation, not a change to the underlying unit definitions.
For 500 milliseconds, divide by 1,000 to get 0.5 seconds. For 1 year under this converter’s convention, multiply 31,536,000 seconds per year by the input value. Each result can be checked by converting back to the original unit, allowing for the displayed rounding.
Use cases
See how the tool fits into real work and everyday tasks.
A developer has a timeout expressed in milliseconds and needs seconds for a note or configuration review. Enter the duration and copy the seconds result, while keeping the consuming system’s required precision in mind.
An editor or technician needs to compare a short interval in seconds, milliseconds, or microseconds. Convert the same duration into each unit and retain enough displayed places for the task.
A team wants to express 120 hours as days or weeks of elapsed duration. Convert it as a fixed time quantity; do not treat the result as business days or staffed workdays unless you separately account for the work schedule.
Q&A
Find concise answers to common questions and confusing cases.
Yes, for this converter’s fixed factor. It uses 2,628,000 seconds per month, which is about 30.4167 days. A named calendar month may be 28 to 31 days, so this is not a date-addition result.
The configured factor is 31,536,000 seconds, or 365 fixed days. It is a tool convention for unit conversion, not an average calendar year or a Julian year.
No. Enter one numeric value with one selected unit. Convert 1 hour 30 minutes to 1.5 hours or 90 minutes before entering it.
It shows more decimal places, but does not make the fixed month or year factors calendar-aware. Results are rounded for display and use ordinary numeric arithmetic.
Notes
Review scope, result limitations, and important precautions before use.
Use the displayed precision appropriate to your task, and keep the converter’s fixed 365-day year and 2,628,000-second month in view whenever those units appear. The outputs are duration equivalents; they do not account for daylight-saving changes, time zones, holidays, work schedules, contract-specific day-count rules, or a particular calendar date. For scientific measurement, finance, or legal deadlines, use the definitions and precision required by the governing method or agreement.
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