How to use this tool
Enter a duration and choose its source and destination units.
Mean months and Gregorian years use the stated fixed definitions. Use a date calculator for actual calendar boundaries.
Converted = input × source factor / target factor
Worked example
24 hour · converted value
Fixed example using the settings below. Monetary examples use USD; dates and times use their stated reference values. This example stays unchanged when you edit your calculation.
Example inputs
- Value: 1
- From: day
- To: hour
Method illustration: 1 day is 24 hours or 86,400 seconds.
Assumptions and limits
- Uses the fixed definitions shown in the unit names. No currency or physical-density conversion is involved.
- A mean Gregorian year is defined here as 365.2425 days; a mean month is one twelfth of that. Actual calendar months, years and local DST days vary.
Method reference: NIST SI conversion guide
Check or report a result
Check the units, selected calculation and assumptions first. Compare the fixed example above with your inputs to identify what changed.
Report a calculation issue with the page address, hypothetical inputs, result displayed and result expected. Do not include passwords, bank details or other private information.