(Oliver Smoot, by the way, built a whole career on measurement. He spent two years as president of the International Organization for Standardization (ISO), was executive VP of the Information Technology Industry Council, a trade association that, among other things, promotes standardized measurements within the computer industry. He was also Chairman of the Board of the American National Standards Institute, which creates, promotes and enforces the consistency of measurement standards. He did not win a Nobel Prize; that was his cousin, George Smoot, an astrophysicist/cosmologist at Lawrence Berkely National Laboratory and UCal Berkeley who won for research on cosmic radiation that is a residue of the Big Bang. Here is George talking about the design of the universe at the 2008 TED conference; he didn't measure it in smoots.)
ConvertUnits.com also does odder measures, including this page that converts an ell (a medieval version of the Old Testament-era cubit) to zeptometer (one 1,000,000,000,000,000,000,000 th of a meter (1 * 10 -21), though the odds that you'll need it are slim unless you're building an Ark with very, very, very tight manufacturing tolerances.