Time Converter Online Free
Convert between nanoseconds, microseconds, milliseconds, seconds, minutes, hours, days, weeks, months, and years instantly. No signup, runs entirely in your browser.
All Time Conversions
| Unit | Value |
|---|---|
| Nanosecond (ns) | — |
| Microsecond (μs) | — |
| Millisecond (ms) | — |
| Second (s) | — |
| Minute (min) | — |
| Hour (hr) | — |
| Day (d) | — |
| Week (wk) | — |
| Month (avg) (mo) | — |
| Year (yr) | — |
How to Convert Time
- 1Select the source unit from the From dropdown — e.g. hours.
- 2Enter your value. The target unit result updates instantly. Use the swap button (↔) to reverse direction.
- 3The all conversions table shows the value in every supported unit simultaneously.
Time Units from Nanoseconds to Years
Time measurement spans many orders of magnitude. Computing uses nanoseconds (CPU cycles, memory latency) and milliseconds (network latency, animation frames). Human activities use seconds, minutes, and hours. Calendar calculations use days, weeks, months, and years. The converter handles all these with a single input. Note that months and years use standard averages (30.4375 days/month, 365.25 days/year) to account for calendar irregularities.
Time Unit Conversion Reference
| Unit | In Seconds | Example |
|---|---|---|
| 1 Nanosecond | 0.000000001 s | CPU clock cycle ~0.33 ns |
| 1 Millisecond | 0.001 s | Human blink ~150 ms |
| 1 Second | 1 s | — |
| 1 Minute | 60 s | 60 × 1 s |
| 1 Hour | 3,600 s | 60 min × 60 s |
| 1 Day | 86,400 s | 24 hr × 3,600 s |
| 1 Week | 604,800 s | 7 × 86,400 s |
| 1 Month (avg) | 2,629,800 s | 365.25 ÷ 12 × 86,400 s |
| 1 Year (Julian) | 31,557,600 s | 365.25 × 86,400 s |
Quick Time Conversion Tips
Hours to Minutes
Multiply by 60. So 2.5 hours = 150 minutes. Reverse: divide minutes by 60 to get hours. 90 minutes = 1.5 hours = 1 hour 30 minutes.
Days to Hours
Multiply by 24. 7 days = 168 hours. A common year = 8,760 hours. A leap year = 8,784 hours. Useful for SLA and uptime calculations.
Milliseconds in Computing
Network latency under 20 ms is excellent for gaming. API response times under 200 ms feel instant to users. A 60 fps display refreshes every ~16.7 ms.
Months and Years
Not all months are equal (28–31 days). For exact date arithmetic use a calendar tool. For approximate calculations, 1 month ≈ 4.35 weeks or 30.44 days.
Frequently Asked Questions
How many seconds are in an hour?
One hour = 60 minutes × 60 seconds = 3,600 seconds. One day = 24 hours = 86,400 seconds. One week = 604,800 seconds.
How many days are in a month?
The converter uses an average month of 30.4375 days (365.25 days ÷ 12), which accounts for leap years. In the Gregorian calendar, months range from 28 to 31 days, so this is an average for calculation purposes.
How many seconds are in a year?
The converter uses a Julian year of 365.25 days = 31,557,600 seconds. This accounts for leap years. The exact length varies: a common year = 31,536,000 s, a leap year = 31,622,400 s.
What is a millisecond?
One millisecond (ms) = 0.001 seconds = 1/1000 of a second. Milliseconds are used in networking (ping/latency), audio production, and sports timing. Human reaction time is typically 150–300 ms.
What is a nanosecond?
One nanosecond (ns) = 0.000000001 seconds (10⁻⁹ s). CPU clock speeds are measured in nanoseconds — a 3 GHz processor completes a clock cycle every ~0.33 ns. Light travels about 30 cm in one nanosecond.
Does the converter work offline?
Yes. All conversion factors are built into the page. After it loads, you can use the converter without an internet connection.