How many seconds are in a week?

There are exactly 604,800 seconds in a standard 7-day week.

How do you convert minutes to hours?

Divide the total number of minutes by 60 to get the duration in decimal hours.

Time Unit Converter - Free & Accurate Online Calculator

Time Unit Converter (calendar-accurate months & years)

Value

Unit

Reference start date (used for months & years)

Note: months & years are calendar-accurate relative to the reference start date. If converting months/years you must set a reference date.

Precision Temporal Scaling: Universal Time Unit Converter

Primary Goal	Input Metrics	Output Results	Why Use This?
Chronological Standardization	Any Time Value (ms to yrs)	10+ Synchronized Time Units	Eliminates manual division errors and accounts for leap-year averages in long-term planning.

Understanding Time Unit Hierarchies

Time measurement is a unique mathematical system because it is not purely decimal. While most scientific units use Base-10, time utilizes a mix of Sexagesimal (Base-60 for minutes/seconds), Duodecimal (Base-12 for hours/months), and Astronomical cycles (365.25 days for years).

Understanding these entity relationships is vital for synchronized scheduling, scientific data logging, and historical analysis. Accuracy at the millisecond level can be the difference between a successful software deployment and a system-wide race condition.

Who is this for?

Project Managers: For converting “man-hours” into weeks and months for resource allocation.
Software Developers: For translating human-readable time into milliseconds or seconds for Unix timestamps and API timeouts.
Students & Researchers: For performing dimensional analysis in physics or chemistry problems.
Logistics Planners: For calculating transit times across multi-modal transport durations.

The Logic Vault

The conversion between time units requires a chain of multiplication or division based on specific temporal constants.

$$T_{target} = T_{source} \times \left( \prod_{i=1}^{n} k_i \right)$$

Variable Breakdown

Name	Symbol	Unit	Description
Time Source	$T_{source}$	Variable	The initial value you are converting from.
Time Target	$T_{target}$	Variable	The resulting value in the desired unit.
Sexagesimal Constant	$k_{60}$	$60$	Ratio for seconds-to-minutes and minutes-to-hours.
Sidereal Constant	$k_{year}$	$365.25$	The average number of days in a Julian year, accounting for leap years.
Weekly Constant	$k_{week}$	$7$	The fixed number of days per week.

Step-by-Step Interactive Example

Let’s calculate exactly how many seconds are in 1.5 weeks.

Convert Weeks to Days:$$1.5 \times 7 = \mathbf{10.5 \text{ days}}$$
Convert Days to Hours:$$10.5 times 24 = mathbf{252 text{ hours}}$$
Convert Hours to Minutes:$$252 times 60 = mathbf{15,120 text{ minutes}}$$
Convert Minutes to Seconds:$$15,120 times 60 = mathbf{907,200 text{ seconds}}$$

Information Gain: The “Leap Year Drift” in Long-Term Calculations

Most basic converters use 365 days as the constant for a year. However, for high-precision planning or astronomical data, this leads to significant error.

Expert Edge: A true calendar year (Julian average) is 365.25 days.

Standard Error: 100 “standard” years = 36,500 days.
Precision Value: 100 “Julian” years = 36,525 days.

If you are calculating time-sensitive interest rates, space-time coordinates, or multi-decade project durations, failing to use the $365.25$ constant will result in a 25-day error per century. Our tool uses the Julian average to ensure long-term mathematical integrity.

Strategic Insight by Shahzad Raja

“In 14 years of Tech Architecture, I’ve seen ‘Time’ become the most frequent cause of database corruption. When converting time units for software, always convert to the smallest required unit first (usually milliseconds) before performing further arithmetic. This avoids ‘Floating Point’ rounding errors that occur when you work with fractions of hours or days. In 2026, Google values precision over simplicity—always show your constants.”

Frequently Asked Questions

How many seconds are in a day?

One standard day contains exactly 86,400 seconds ($24 \times 60 \times 60$).

How do I calculate 1 million seconds in days?

Divide 1,000,000 by 86,400.

$$1,000,000 \div 86,400 \approx \mathbf{11.57 \text{ days}}$$

Is a month a standard unit for conversion?

Technically, no. Months vary from 28 to 31 days. For conversion tools, a “Standard Month” is typically calculated as $1/12$ of a Julian year, or approximately 30.4375 days.

Related Tools

Unix Timestamp Converter: For translating raw seconds into human-readable calendar dates.
Day Counter: To find the exact duration between two specific calendar dates.
Decimal to Time Calculator: Convert values like 8.5 hours into 8 hours and 30 minutes.