Time Converter: Convert Any Duration Across 10 Units Instantly
Time unit conversion shows up everywhere: a developer needs to know how many milliseconds are in 90 seconds, a project manager wants to express a 10,000-hour estimate in years, a scientist needs nanoseconds converted to microseconds. Our Time Converter handles all of these with a clean instant-result interface covering 10 time units from nanoseconds to years.
Beyond a simple two-unit converter, this tool shows all 10 conversions simultaneously in a clickable grid — tap any unit card to instantly switch the target. The smart number formatter keeps results readable at every scale: large numbers get locale commas, tiny decimals get significant figures, and extreme values switch to scientific notation automatically.
All conversions run entirely in your browser. No server round-trips, no delays, no data collection.
Every unit is internally expressed in seconds. Converting from any unit to any other unit is a single multiplication: convert to seconds first, then divide by the target unit's seconds-per-unit ratio.
Conversion Reference: All Units in Seconds
Every time unit is defined as an exact number of seconds, enabling precise single-step conversions:
- 1 nanosecond = 0.000000001 s (10⁻⁹)
- 1 microsecond = 0.000001 s (10⁻⁶)
- 1 millisecond = 0.001 s
- 1 second = 1 s (base unit)
- 1 minute = 60 s
- 1 hour = 3,600 s
- 1 day = 86,400 s
- 1 week = 604,800 s
- 1 month = 2,629,746 s (avg: 365.2425 ÷ 12 × 86400)
- 1 year = 31,556,952 s (avg: 365.2425 × 86400)
Common Use Cases by Field
Software development: Convert API timeout values (ms to seconds), cache TTLs (seconds to hours), token expiry (seconds to days). Benchmark CPU operations measured in nanoseconds.
Project management: Convert sprint hours to work days, express project timelines in weeks or months, calculate resource hours from day counts.
Science & engineering: Particle physics uses nanoseconds and microseconds for event timing. Astronomy uses years and centuries. Signal processing uses milliseconds and microseconds for sampling intervals.
Daily life: Convert recipe times (minutes to hours), sleep durations (hours to minutes), event countdowns (days to hours).
Practical Examples
Converting 90 Minutes to Hours
A common conversion for work scheduling and billing — converting meeting blocks from minutes to hours.
- 1.Input: 90 minutes
- 2.Formula: 90 × (60 s ÷ 3600 s) = 90 ÷ 60 = 1.5
- 3.Result: 1.5 hours
- 4.All units: 5,400 s · 90 min · 1.5 h · 0.0625 days · 0.00893 weeks
Converting 1 Year to All Units
Expressing one average calendar year (365.2425 days) across all supported time units.
- 1.Input: 1 year
- 2.Seconds: 31,556,952 s
- 3.Minutes: 525,949.2 min
- 4.Hours: 8,765.82 h
- 5.Days: 365.2425 d
- 6.Weeks: 52.18 wk · Months: 12 mo
Frequently Asked Questions
What time units does this converter support?
10 units: nanoseconds (ns), microseconds (µs), milliseconds (ms), seconds (s), minutes (min), hours (h), days (d), weeks (wk), months (mo), and years (yr).
How accurate is the month and year conversion?
Months use the average Gregorian calendar length of 30.4369 days (2,629,746 seconds), and years use 365.2425 days (31,556,952 seconds). This matches the average calendar year accounting for leap years. For precise date-based calculations, use the Days Between Dates tool instead.
Can I see all unit conversions at once?
Yes. The 'All Time Units' grid below the main result shows your input converted to every supported unit simultaneously. Click any unit card to instantly set it as the 'To' target.
How do I swap the From and To units?
Click the swap button (the double arrow icon between the dropdowns) or the Swap button in the action row. This also plugs the result value into the input field so you can reverse the conversion precisely.
How does the tool handle very large or very small numbers?
The smart formatter automatically switches between fixed-point notation, locale-formatted numbers with commas, and scientific notation (e.g. 3.1557e+13) depending on the magnitude of the result to keep it readable.
Can I copy all conversions at once?
Yes. Click 'Copy All' in the All Time Units panel to copy every conversion result as a newline-separated list to your clipboard.
How many nanoseconds are in a second?
1 second = 1,000,000,000 nanoseconds (1 billion nanoseconds). Nanoseconds are commonly used in CPU clock timing, network latency benchmarks, and high-frequency trading systems.
Does this tool work offline?
Yes. All conversions are calculated locally in your browser using pure JavaScript. No internet connection is needed after the page loads.