!
The conversion is approximate.

Either the unit does not have an exact value,

or the exact value is unknown. ? Is it a number? Sorry, can't parse it. (?) Sorry, we don't know this substance. Please pick one from the list. *** You have not choosen the substance. Please choose one.

Without the substance conversion to some units cannot be calculated.**Hint:** Can't figure out where to look for your unit? Try searching for the unit name. The search box is in the top right corner of the page.**Hint:** You don't have to click "Convert Me" button every time. Hitting Enter or Tab key after typing in your value also triggers the calculations.**Found an error? Want to suggest more conversions?** Contact us on Facebook.**Did you know?**

In medieval and ancient times usage of Roman numerals was not consistent. For example, you could find both VIII and IIX to designate eight even in the same document.
?
Not a valid Roman numeral
?
Not a valid undecimal number. Please only use digits 0 to 9 and letter A
?
Not a valid octal number. Please only use digits from 0 to 7
?
Not a correct number.
?
Not a valid duodecimal number. Please only use digits 0 to 9 and letters A and B
?
Not a valid binary number. Please only use digits 0 and 1
?
Not a valid quinary number. Please only use digits 0 to 4
?
Not a valid ternary number. Please only use digits 0 to 2
?
Not a valid quaternary number. Please only use digits 0 to 3
?
Not a decimal integer.
?
Not a valid Greek numeral
?
Not a valid hexadecimal number. Please only use digits 0 to 9 and letters from A to F

Either the unit does not have an exact value,

or the exact value is unknown. ? Is it a number? Sorry, can't parse it. (?) Sorry, we don't know this substance. Please pick one from the list. *** You have not choosen the substance. Please choose one.

Without the substance conversion to some units cannot be calculated.

i

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Does convert-me.com really exist since 1996? In fact it's even older. We launched the first version of our online units converter in 1995. There was no JavaScript there and all conversions had to be done on server. The service was slow. A year later the technology allowed us to create an instant units conversion service that became the prototype of what you see now.

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In medieval and ancient times usage of Roman numerals was not consistent. For example, you could find both VIII and IIX to designate eight even in the same document.