Numarly

Time Converter (All-in-One)

Convert between seconds, minutes, hours, days, weeks, months and years instantly

Converted Values

Seconds (s): 3600.00

Minutes (min): 60.00

Hours (hr): 1.00

Days: 0.04

Weeks: 0.01

Months: 0.00

Years: 0.00

Formula

All conversions are calculated using seconds as the base unit.

Example: 1 hour = 3600 seconds

What is it?

This time converter converts between seconds, minutes, hours, days, weeks, months, and years simultaneously — useful for productivity tracking, project planning, and everyday calculations.

Formula

  • 1 hour = 60 minutes
  • 1 day = 24 hours
  • 1 week = 7 days
  • 1 year = 365 days

Formula Explanation

Seconds are the SI base unit for time, so every other unit converts through a fixed multiple of seconds. Months are the one irregular unit here (they range from 28 to 31 days), so this calculator uses an average month length derived from the 365.25-day year for consistent results.

Example Calculation

A project estimated at 3 weeks equals 3 × 7 = 21 days, or 21 × 24 = 504 hours.

How to Use

  1. Enter a time value.
  2. Select the unit.
  3. View the converted time across all supported units instantly.

Benefits

  • Converts across seven common time units in one step.
  • Avoids manual multiplication errors for larger conversions like years to hours.
  • Useful for project planning, scheduling, and everyday calculations.

Use Cases

  • Estimating project timelines across different time units.
  • Converting durations for scientific or statistical calculations.
  • Everyday planning, like converting weeks of vacation into days.

What Your Result Means

Each figure represents the exact same duration, just expressed on a different scale — useful whenever you need to compare or communicate a time span in a more convenient unit.

Tips

  • Use the average month conversion as an estimate, not an exact calendar month.
  • For precise calendar-based durations (e.g. "3 calendar months from today"), use a date calculator instead.
  • Remember a year has 8,760 hours (365 × 24) for quick estimation.

Common Mistakes

  • Treating the average month conversion as exact for a specific calendar month.
  • Forgetting leap years when doing precise year-based calculations by hand.
  • Confusing weeks and business days when planning project timelines.

FAQs

How do I convert hours to minutes?

Multiply the number of hours by 60 to get the equivalent in minutes.

How many seconds are in a day?

1 day equals 86,400 seconds (24 hours × 60 minutes × 60 seconds).

Why does the month conversion use an average value?

Months vary in length (28-31 days), so this calculator uses an average month length (based on the 365.25-day year) for consistent conversions.

How many hours are in a year?

A standard 365-day year has 8,760 hours; a leap year (366 days) has 8,784 hours.

Is this useful for calculating someone's exact age?

It gives a good approximation, but for precise age calculations involving leap years and calendar months, a dedicated date/age calculator is more accurate.

Why is a "year" here 365 days and not 365.25?

The whole-year conversions use 365 days for simplicity, while the month conversion factors in the 365.25-day average to account for leap years across a 4-year cycle.

Month and year conversions use average values; calendar-specific calculations may vary slightly.

Last updated: July 25, 2026