Popular conversions
Use the interactive converter to enter your own value and select any supported pair in this family.
Convert SI time units, calendar approximations and historically used time measures. Use the interactive converter to enter your own value and select any supported pair in this family.
Use the interactive converter to enter your own value and select any supported pair in this family.
Each row links to the live converter. The factor column uses the family’s stated base unit for linear families; for specialized reciprocal or numeral systems, use the live converter and the family-specific explanation.
| Source unit | Factor to base unit | Tool |
|---|---|---|
nanosecondns | 1e-09 | Convert this unit ↗ |
microsecondµs | 1e-06 | Convert this unit ↗ |
millisecondms | 0.001 | Convert this unit ↗ |
seconds | 1 | Convert this unit ↗ |
minutemin | 60 | Convert this unit ↗ |
hourh | 3600 | Convert this unit ↗ |
dayday | 86400 | Convert this unit ↗ |
weekweek | 604800 | Convert this unit ↗ |
fortnightfortnight | 1209600 | Convert this unit ↗ |
30-day monthmonth-30 | 2592000 | Convert this unit ↗ |
365-day yearyear-365 | 31536000 | Convert this unit ↗ |
picosecondps | 1e-12 | Convert this unit ↗ |
femtosecondfs | 1e-15 | Convert this unit ↗ |
kilosecondks | 1000 | Convert this unit ↗ |
megasecondMs | 1000000 | Convert this unit ↗ |
Julian yearyear-julian | 31557600 | Convert this unit ↗ |
Gregorian mean yearyear-gregorian | 31556952 | Convert this unit ↗ |
average Gregorian monthmonth-avg | 2629746 | Convert this unit ↗ |
quarter-year (3 mean months)quarter | 7889238 | Convert this unit ↗ |
decadedecade | 315569520 | Convert this unit ↗ |
century (100 mean years)century | 3155695200 | Convert this unit ↗ |
millenniummillennium | 3.1556952e+10 | Convert this unit ↗ |
sidereal daysidereal-day | 86164.0905 | Convert this unit ↗ |
sidereal yearsidereal-year | 31558149.76 | Convert this unit ↗ |
shakeshake | 1e-08 | Convert this unit ↗ |
jiffy (light travels one centimeter)jiffy-physics | 3.335640952e-11 | Convert this unit ↗ |
Unit standards, historical definitions and approximations can vary. Cooking volume-to-mass conversions depend on the ingredient; currencies require an exchange rate; sizing systems may be discrete; and logarithmic quantities such as decibels need purpose-built formulas rather than a linear scale.
For laboratory, medical, aviation, engineering or other safety-critical work, verify the definitions and standards that apply to your use case.