Time Unit Converter
Convert any time unit instantly hours to minutes, seconds to hours, milliseconds to seconds, days to weeks, months to days, and years to hours. Covers everything from nanoseconds for developers to years for project planners. Type once, copy any output in one click.
27
Units Supported
ns → yr
Full Range
Instant
All Outputs
Free
No Signup
Every Time Unit, Anchored to Seconds
All supported units with exact conversion factors to and from seconds the universal time base
| Unit | Abbr. | To Seconds | From Seconds | Typical Use |
|---|---|---|---|---|
| Nanosecond | ns | ÷ 1,000,000,000 | × 10⁹ | CPU clock cycles, signal timing |
| Microsecond | μs | ÷ 1,000,000 | × 10⁶ | Database queries, GPS signals |
| Millisecond | ms | ÷ 1,000 | × 1,000 | Network latency, animation frames |
| Second | s | × 1 | × 1 | Events, timestamps, physics |
| Minute | min | × 60 | ÷ 60 | Meetings, cooking, travel |
| Hour | hr | × 3,600 | ÷ 3,600 | Work shifts, flight times |
| Day | d | × 86,400 | ÷ 86,400 | Deadlines, delivery windows |
| Week | wk | × 604,800 | ÷ 604,800 | Sprint cycles, billing periods |
| Month | mo | × ~2,629,800 | ÷ ~2,629,800 | Contracts, subscriptions |
| Year | yr | × 31,557,600 | ÷ 31,557,600 | Age, project timelines |
1 Year, 1 Week, 1 Day, 1 Hour Fully Broken Down
How many seconds in a year? How many milliseconds in a day? All the answers in one place
Why 86,400 seconds in a day? 24 hours × 60 minutes × 60 seconds = 86,400 s. This number is deeply embedded in computing Unix timestamps count seconds since 1 Jan 1970, and a day boundary is always a multiple of 86,400. One millisecond deviation in a server clock accumulates to ~86 seconds of drift per year.
Exact Formulas for Every Common Conversion
All multipliers and divisors use these to calculate manually or verify the tool's output
| Convert | Formula | Example |
|---|---|---|
| hr → min | hr × 60 | 2.5 hr = 150 min |
| min → s | min × 60 | 90 min = 5,400 s |
| hr → s | hr × 3,600 | 1 hr = 3,600 s |
| d → hr | d × 24 | 3 d = 72 hr |
| wk → d | wk × 7 | 2 wk = 14 d |
| wk → hr | wk × 168 | 1 wk = 168 hr |
| mo → d | mo × 30.4375 | 6 mo ≈ 182.6 d |
| yr → d | yr × 365.25 | 1 yr = 365.25 d |
| yr → hr | yr × 8,766 | 1 yr = 8,766 hr |
| s → ms | s × 1,000 | 5 s = 5,000 ms |
| ms → μs | ms × 1,000 | 10 ms = 10,000 μs |
| min → hr | min ÷ 60 | 45 min = 0.75 hr |
hh:mm:ss to Seconds, Decimal Hours & More
Convert clock-format time strings to usable numbers essential for developers, analysts, and payroll
| hh:mm:ss | Meaning | Total Seconds | Decimal Hours |
|---|---|---|---|
1:30:00 | 1 hour 30 minutes | 5,400 s | 1.5 hr |
0:45:00 | 45 minutes exactly | 2,700 s | 0.75 hr |
2:15:30 | 2 hr 15 min 30 sec | 8,130 s | 2.258 hr |
0:01:30 | 1 minute 30 seconds | 90 s | 0.025 hr |
10:00:00 | 10 hours exactly | 36,000 s | 10 hr |
23:59:59 | Almost 1 full day | 86,399 s | 23.999 hr |
Formula: hh:mm:ss → total seconds = (hh × 3,600) + (mm × 60) + ss. To get decimal hours: total seconds ÷ 3,600. Decimal hours are used in most payroll and billing systems. Enter total seconds into the converter to get all other units simultaneously.
Time Conversion Across Every Field
From nanosecond-level debugging to year-scale project planning the unit changes, the tool stays the same
Software & DevOps
Developers work in milliseconds (ms) for latency, microseconds (μs) for DB queries, and nanoseconds (ns) for CPU profiling but SLAs, sprint lengths, and deploy windows are in hours, days, and weeks. Converting across these ranges is a daily task.
Payroll & Work Logs
Payroll systems record time in decimal hours (e.g., 7.5 hr) but employees log in hours and minutes (7 hr 30 min). Converting minutes to decimal hours and back is required for accurate billing, timesheets, and project tracking.
Project & Academic Planning
Project managers estimate effort in weeks and months, schedule tasks in hours and days, and track progress in days elapsed. Students convert study time to minutes, semesters to weeks, and deadlines to hours remaining.
Sports, Fitness & Media
Athletes track performance in minutes and seconds (mm:ss), media durations are in hours and minutes, and training plans span weeks to months. Converting race times, video lengths, and training blocks across units is routine.
Time Conversion Questions Answered
Covering seconds, minutes, hours, days, weeks, months, years, ms, μs, ns with exact formulas and examples
Core Time Conversions
Enter your hour (hr) value, select hr as the source unit the minute (min) result appears instantly. Formula: hr × 60 = min. Example: 2.5 hr = 150 minutes. One hour = 60 minutes = 3,600 seconds (s) exactly. Copy the result with one click no typing needed.
1 minute (min) = 60 seconds (s) exactly. 1 hour (hr) = 3,600 seconds (60 min × 60 s). Common references: 90 seconds = 1.5 min; 5 minutes = 300 s; 30 minutes = 1,800 s; 1 hour 30 minutes = 5,400 s. In milliseconds: 1 minute = 60,000 ms; 1 hour = 3,600,000 ms.
Minutes to seconds: min × 60 = s. Example: 45 min = 2,700 s. Seconds to minutes: s ÷ 60 = min. Example: 90 s = 1.5 min. Decimal minutes work too: 1.75 min = 105 s. This conversion is common in sports timing (race splits), cooking timers, and workout intervals.
Days to hours: d × 24 = hr. Example: 3 days = 72 hours. Hours to days: hr ÷ 24 = d. Example: 36 hr = 1.5 days. In minutes: 1 day = 1,440 min. In seconds: 1 day = 86,400 s. The 86,400-second day is a fixed value used in Unix timestamps, SLA calculations, and astronomy.
UntangleTools Time Converter supports: nanosecond (ns), microsecond (μs), millisecond (ms), second (s), minute (min), hour (hr), day (d), week (wk), month (mo), year (yr). Enter any value, select the source unit, and all outputs appear simultaneously. One-click copy per result. Free, no login, mobile-friendly at untangletools.com/unit/category/time.
Three steps: (1) Type or paste a time value integers and decimals both work (e.g., 1.5 hr, 90 min, 7200 s). (2) Select the source unit from the dropdown: ns, μs, ms, s, min, hr, d, wk, mo, or yr. (3) All other units update instantly. Tap the Copy button on any row to copy that value directly to your clipboard.
Multiply hours by 60: hr × 60 = min. Examples: 1 hr = 60 min; 2.5 hr = 150 min; 0.5 hr = 30 min. In reverse: min ÷ 60 = hr. The factor of 60 comes from the Babylonian sexagesimal (base-60) numeral system, which is why we have 60 seconds in a minute and 60 minutes in an hour a system over 3,000 years old.
To get minutes past midnight from a 24-hr time: hours × 60 + minutes = total minutes. Example: 14:30 = (14 × 60) + 30 = 870 minutes past midnight. For 12-hr: convert PM hours by adding 12 first (2:30 PM = 14:30 → 870 min). Back to time: 870 ÷ 60 = 14 hr remainder 30 min = 14:30. Useful in scheduling algorithms, shift-gap calculations, and database time storage.
hh:mm:ss to total seconds: (hh × 3,600) + (mm × 60) + ss. Example: 1:15:30 = 3,600 + 900 + 30 = 4,530 s. Total seconds back to hh:mm:ss: hours = ⌊s/3600⌋, minutes = ⌊(s mod 3600)/60⌋, seconds = s mod 60. mm:ss to seconds: (mm × 60) + ss. Example: 4:33 = 273 s. This pattern is essential for video timestamps, sports timing, and log parsing.
More Converters on UntangleTools
All free, instant, no signup the complete unit conversion toolkit
Length Converter
mm, cm, m, km, inches, feet, yards, miles.
Try tool →Mass Converter
kg to lb, g to oz, mg, stone, tonne.
Try tool →Speed Converter
km/h, mph, m/s, knots travel and physics.
Try tool →Data Storage Converter
GB to MB, TB to GB, bits to bytes.
Try tool →Temperature Converter
Celsius, Fahrenheit, Kelvin.
Try tool →Volume Converter
ml, L, m³, gallons, cups, fl oz.
Try tool →
