Time Unit Converter
The Time Unit Converter lets you instantly convert any time value between seconds, minutes, hours, days, weeks, months (defined as 30 days), and years (defined as 365 days). Simply enter a number, choose the source unit and the target unit, and the result appears immediately — no button to press.
Time conversions are essential in programming, project planning, scientific research, and everyday life. Whether you need to know how many seconds are in a week or how many years correspond to a million minutes, this tool handles the math precisely and transparently.
How it works
All conversions go through a common base (seconds). Each unit has a fixed factor: 1 minute = 60 s, 1 hour = 3 600 s, 1 day = 86 400 s, 1 week = 604 800 s, 1 month = 2 592 000 s (30 d), 1 year = 31 536 000 s (365 d). Result = input × (seconds_per_from_unit / seconds_per_to_unit).
Use cases
- Converting API rate-limit intervals from seconds to hours
- Calculating project durations in days or weeks from total hours worked
- Determining how many seconds remain until a deadline given in days
- Converting scientific experiment durations between different time scales
- Estimating age in days, weeks, or months from years
Frequently asked questions
How many seconds are in a day, a week, and a year?
A day has 86,400 seconds (24 × 60 × 60), a week has 604,800 seconds, and a 365-day year has 31,536,000 seconds. These fixed factors are exactly what the converter uses internally, so you can verify any result by hand.
How does a time unit converter work?
Every conversion goes through a common base unit: seconds. The tool multiplies your input by the number of seconds in the source unit, then divides by the number of seconds in the target unit. For example, 3 hours to minutes is 3 × 3,600 ÷ 60 = 180 minutes.
Why does the converter use 30 days for a month and 365 days for a year?
Calendar months vary between 28 and 31 days and leap years have 366 days, so a fixed convention is needed for consistent unit conversion. This tool defines 1 month = 30 days and 1 year = 365 days, which is the standard approach for duration math. For calendar-exact results between two specific dates, use a date calculator instead.
How do I convert hours to days manually?
Divide the number of hours by 24, since a day has 24 hours. For example, 36 hours ÷ 24 = 1.5 days. To go the other way, multiply days by 24 to get hours.
Can I convert very large values, like a million minutes to years?
Yes. A million minutes equals 60,000,000 seconds, and dividing by 31,536,000 seconds per year gives roughly 1.9 years. The converter handles any magnitude instantly because it only applies fixed multiplication and division factors.