This equation allows the User to enter an input quantity as a real number and the Units are  selected from a "units to convert" list.   The output units are also specified by selection of "resultant units".

This Equation allows converting units of Volume, specifically including:

acre-foot,barrels of oil,beer barrels,beer firkins,beer hogsheads,beer kilderkins,board foot,bushels,cc,ccf,ci,cords,cubic centimeter,cubic centimetre,cubic feet,cubic inch,cubic kilometer,cubic meter,cubic millimeter, cups,English tierces,fluid barrels,fluid drams,fluid ounce,fluid oz.,full kegs,gal.,gallons,gills,Gross Register Tonnes, half barrels,hogsheads,Imperial bushel,Imperial bushels,Imperial dessert spoons,Imperial fluid drams,Imperial fluid ounce,Imperial fluid ounces,Imperial gallons,Imperial gills,Imperial minims,Imperial pecks,Imperial pints,Imperial quarts,Imperial tablespoons,Imperial teaspoons,km3,liters,litres,m3, minims,mm3,pecks,pints,puncheons ,qt,quarter barrels,quarts,register tonne,shots,sixth barrels,tablespoons,tbsp,teaspoons,tierces,tsp,wine firkins,wine rundlets,milliliter,butt,buckets,Coombs,imperial dashes,cubic fathoms 

Notes

NIST publishes a Handbook that lists conversion factors for many Units.  This equation uses the Volume data found in Appendix: B.9 Factors for units listed by kind of quantity or field of science.

Units in this Conversion Equation:

• acre-foot (based on U.S. survey foot)
• barrel [for petroleum, 42 gallons (U.S.)]
• bushel (U.S.)
• cord
• cubic foot
• cubic inch
• cubic mile
• cubic yard
• cup
• fluid ounce (U.S.)
• gallon [Canadian and U.K. (Imperial)] 
• gallon (U.S.)
• gill [Canadian and U.K. (Imperial)] 
• gill (U.S.)
• liter 
• ounce [Canadian and U.K. fluid (Imperial)] 
• ounce (U.S. fluid)
• peck (U.S.)
• pint (U.S. dry)
• pint (U.S. liquid)
• quart (U.S. dry)
• quart (U.S. liquid)
• stere
• tablespoon
• teaspoon
• ton, register