How to Convert Time Units
Convert between different time units instantly. Our converter handles seconds, minutes, hours, days, weeks, months, and years-useful for project planning, scheduling, and time calculations.
Understanding Time Units
Time is measured in standardized units based on Earth's rotation (days) and orbit (years). Smaller units (seconds, minutes, hours) are divisions of a day, while larger units (weeks, months, years) group days together.
Time Unit Relationships
1 minute = 60 seconds, 1 hour = 60 minutes = 3,600 seconds, 1 day = 24 hours = 86,400 seconds, 1 week = 7 days, 1 year = 365.25 days (average).
Example:
2.5 hours = 2.5 × 60 = 150 minutes = 150 × 60 = 9,000 seconds. 90 days = 90 ÷ 7 = 12.86 weeks.
Common Use Cases
Real-world applications for this calculator
Project Management
Convert between hours, days, and weeks for scheduling and deadline calculations.
Billing & Time Tracking
Convert time worked between different units for invoicing or payroll.
Duration Calculations
Convert video lengths, travel times, or event durations between units.
Tips
- Quick conversions: multiply hours by 60 for minutes, minutes by 60 for seconds.
- For work hours: 40 hours/week × 52 weeks = 2,080 work hours per year.
- A million seconds is about 11.5 days; a billion seconds is about 31.7 years.
Frequently Asked Questions
How many seconds are in a day?
There are 86,400 seconds in a day. Calculate: 24 hours × 60 minutes × 60 seconds = 86,400 seconds.
How many hours are in a year?
There are 8,760 hours in a regular year (365 days × 24 hours) and 8,784 hours in a leap year (366 × 24).
How do I convert decimal hours to hours and minutes?
Multiply the decimal part by 60. For example, 2.75 hours: the .75 × 60 = 45 minutes, so 2.75 hours = 2 hours 45 minutes.
Why are there different month lengths?
Months evolved from lunar cycles (~29.5 days) but were adjusted to fit 12 months in a solar year (365.25 days). This resulted in months of 28-31 days.