Cleave BooksConversion Calculator for Units ofFEET & INCHES Show values to . . . 3 4 5 6 7 8 9 significant figures.
 feet & inches
 feet inches metres centimetres millimetres
Restrictions
On the (first) Feet & Inches line, the number of feet must be
a whole number greater than, or equal to, 1
and the inches must be less than 12.
(Feet with decimals can be entered on the 2nd line.)
Unvalued zeros on all numbers have been suppressed.
 CautionNO guarantee as to the accuracy of these values is given.And they should be checked against some other source.
 Additional InformationOnly in the imperial system of measures are mixed units "allowed".That is, measurements like19 feet 4 inches17 miles 13 yards 2 feet5 pounds 7 ounces3 tons 5 hundredweights 2 stonesetcIn the SI or metric system mixed measures are "not allowed", and they are certainly not necessary. Something like15 metres 78 centimetres 3 millimetresis expressed as15.783 metresand it is so easy with a system which is based on powers of 10. Just a matter of adjusting the decimal point. It can be done on sight, no arithmetic is necessary. Contrast that with trying to do a similar thing in the imperial system.But do we need to be able to change mixed units into a single unit? Most definitely! Costing depends upon it. So does finding areas and volumes. Using formulas and changing into other systems also require it. So, science, engineering and commerce have to deal with it regularly. It is no wonder that science "went metric" over a 100 year ago.Perhaps it should be added that, although reference has been made here to the awkward nature of the imperial system, the measuring systems of nearly all other cultures and times have the same underlying fault in their mixed systems We should be clear where the "fault" lies. It is not in the fact that the imperial system uses measures called feet and inches etc., but in the relationships between those measures.12 inches = 1 foot3 feet = 1 yard22 yards = 1 chainetc.Now consider the measurement of5 yards 2 feet 7 inchesTo change that into a single measure (for whatever purpose) some arithmetic is needed to get any one of these5.8611111 yardsOR17.583333 feetOR211 inchesIF instead we had10 inches = 1 foot10 feet = 1 yardthen the above mixed measurement could easily be read off as any of5.27 yards52.7 feet527 inchesNo contest!

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