Try this:

=timevalue("0:"&right(a1,5))

Format as mm:ss

Regards,
Fred.

"Sholto" wrote in message
...
I have time stored as text in the format 'mm:ss (e.g. '25:15)
Note
the leading apostrophe.
Every Excel function & format I try assumes the minutes are hours and the
seconds minutes. I can manually edit cell to 0:mm:ss to get the
functionality
I need but have 2000 rows to edit...

Any ideas would be much appreciated.