Time Unit Converter

What is a Time Unit Converter?

Time is one of the most fundamental measurements in daily life, science, business, and technology. Whether you're scheduling work, calculating age, converting milliseconds in programming, or estimating centuries for historical timelines, you often need to switch between different time units quickly and accurately.

The Time Unit Converter is designed to make that process effortless. Just enter a value in any time unit, and it will automatically convert it into all other supported units — from nanoseconds to millennia.

Supported Time Units

The Time Unit Converter supports a wide range of time units, covering everything from the tiniest measurable intervals to vast spans of time:

• Seconds (s)
• Minutes (min)
• Hours (h)
• Days (d)
• Weeks (w)
• Months (mo)
• Years (y)
• Decades
• Centuries
• Millennia
• Milliseconds (ms)
• Microseconds (μs)
• Nanoseconds (ns)

No matter what unit you start with, the converter instantly gives you accurate equivalents across all these categories.

For example, if you input 1 second, the results will display:

• 1 second = 1000 milliseconds
• 1 second = 1000000 microseconds
• 1 second = 1000000000 nanoseconds

Each result includes a copy button, allowing you to quickly use the converted values.

Why Use a Time Unit Converter?

Time conversions can be surprisingly tricky, especially when you move across very large or very small scales. Manually calculating these often involves multiplication and division by factors of 60, 24, 7, 30, 365, or more — and it's easy to make mistakes.

A Time Unit Converter helps you:

• Save time — get instant results without formulas.
• Avoid errors — let the calculator handle precise conversions.
• Work across contexts — useful for scientists, students, developers, writers, historians, and anyone working with data that spans multiple time units.
• Understand scale — quickly see how a value in one unit compares to another (e.g., how many milliseconds in a century!).

Frequently Asked Questions

How many seconds are in a day?

There are 86,400 seconds in one day (24 hours × 60 minutes × 60 seconds).

How many days are in a month?

For conversion, the average month length is 30.44 days, which accounts for all 12 months in a typical year.

How many weeks are in a year?

A standard year has 52 weeks and 1 day, while a leap year has 52 weeks and 2 days.

How many milliseconds are in a second?

There are 1,000 milliseconds in one second.

What is smaller than a microsecond?

A nanosecond is smaller. One microsecond equals 1,000 nanoseconds.

How many years are in a century?

A century is exactly 100 years.

How many years are in a millennium?

A millennium equals 1,000 years.

How many hours are in a year?

A non-leap year has 8,760 hours (365 × 24), and a leap year has 8,784 hours (366 × 24).

How many minutes are in a day?

There are 1,440 minutes in a day (24 × 60).

How many days are in a year?

A regular year has 365 days, and a leap year has 366 days.

How many seconds are in a year?

A regular year has 31,536,000 seconds (365 × 24 × 60 × 60). A leap year has 31,622,400 seconds.

How do you convert seconds to hours?

To convert seconds to hours, divide the number of seconds by 3,600 (since 1 hour = 3,600 seconds).

How do you convert hours to days?

Divide the number of hours by 24 to find the equivalent in days.

How many nanoseconds are in a second?

There are 1,000,000,000 nanoseconds (1 billion) in a single second.

How many microseconds are in a second?

There are 1,000,000 microseconds in one second.

How many days are in a decade?

A decade has approximately 3,652 days, or 3,653 days if it includes two leap years.

How many days are in a century?

A century has about 36,524 days, accounting for 24 leap years in the 100-year period (though exact numbers can vary due to century leap year rules).

How do you convert months to weeks?

Multiply the number of months by 4.345, which is the average number of weeks in a month.

How do you convert weeks to months?

Divide the number of weeks by 4.345 to estimate months.

How many months are in a decade?

There are 120 months in a decade (10 × 12).