Useful unit and date calculations, with clear rules and readable results.
Find a toolChoose a tool, review its example, and open it directly.
Convert common units for length, area, mass, volume, and temperature.
Enter a value, choose both units, and read the result with its formula.
Open tool：Unit Converter1 m = 100 cm
One metre equals 100 centimetres.
Count days between Gregorian dates or add and subtract whole days from a date.
See the date difference alongside the count that includes both endpoints.
Open tool：Date Difference and Day Calculator2026-06-01 to 2026-06-10
9 days apart; 10 days including both dates.
Sorted by actual publication date.
This homepage is a directory. Calculations run in the browser on each tool page; the hosting service still processes the connection information needed to serve a page.
Calculations run in the browser on each tool page. This homepage does not collect your inputs; the website hosting service still processes technical information needed for connections.
No. Open a tool to enter your values and read the calculation rules on its page.