Time Converter
Convert between seconds, minutes, hours, days, weeks, months and years, with averaged units clearly marked so the numbers are never misleading.
Months average 30.4375 days and years 365.25 — use the Date Calculator for calendar-exact spans.
Category: Time
A month is averaged at 30.4375 days and a year at 365.25 days, so those rows are approximate. For calendar-accurate results use the date calculator.
Result
All units
| Unit | Symbol | Value | Copy |
|---|---|---|---|
| Metric | |||
| Millisecond | ms | 3,600,000 | |
| Second | s | 3,600 | |
| Other | |||
| Minute | min | 60 | |
| Hour | h | 1 | |
| Day | d | 0.0416667 | |
| Week | wk | 0.00595238 | |
| Month | ≈ mo | 0.00136893 | |
| Year | ≈ yr | 0.000114077 | |
| Decade | ≈ dec | 0.0000114077 | |
Units marked ≈ are approximations, not exact definitions.
Conversion factors for every unit
One of each unit expressed in the base unit of this category (Second).
| Unit | Symbol | In Second |
|---|---|---|
| Millisecond | ms | 0.001 |
| Second | s | 1 |
| Minute | min | 60 |
| Hour | h | 3,600 |
| Day | d | 86,400 |
| Week | wk | 604,800 |
| Month | mo | ≈ 2,629,800 |
| Year | yr | ≈ 31,557,600 |
| Decade | dec | ≈ 315,576,000 |
How to use
- The page opens on Time with hours → minutes; pick other units in From and To.
- Type the number in Value to convert seconds, minutes, hours, days and weeks at once.
- Use ⇄ Swap to reverse the pair, and Precision to fix the number of significant digits.
- Rows marked ≈, such as months and years, are averages rather than exact definitions.
- Copy the converted value or any row of the unit table, or use Share link to send it on.
FAQ
How many seconds are in a day?
86,400 seconds — 24 hours × 60 minutes × 60 seconds. Leap seconds can make a rare calendar day one second longer, but 86,400 is the value used everywhere in practice.
How long is a “month” here?
An average month of 30.4375 days (365.25 ÷ 12), because calendar months vary from 28 to 31 days. Rows based on averages are marked ≈. For exact calendar arithmetic use a date calculator.
Why is a year 365.25 days?
That is the Julian year, the averaging convention used for unit conversion: 365 days plus a quarter day for leap years. A specific calendar year is either 365 or 366 days.
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