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Length

inch mm Inch × 25.4 = Millimeter
Millimeter × 0.04 = Inch
foot cm Feet × 30.48 = Centimeter  
Centimeter × 0.033 = Feet  
yard m Yard × 0.9 = Meter  
Meter × 1.1 = Yard  
mile km Mile × 1.60934 = Kilometer  
Kilometer × 0.62137 = Mile

Weight

lb. kg Pound × 0.4536 = Kilogram  
Kilogram × 2.2 = Pound  
oz. kg Ouns × 28.35 = Gram  
Gram × 0.03527 = Ouns

Temperature

°F ℃ °F (華氏) -32 × 5/9 = ℃ (摂氏)  
℃ (摂氏) 9/5 + 32 = °F (華氏)

Volume

gal. l Gallon × 3.8 = Liter  
Liter × 0.26 = Gallon  
oz. ml Ouns × 31.5 = Milliliter  
Milliliter × 0.034 = Ouns

Area

sq.ft. m2 sq.ft × 0.09 = m2  
m2 × 10.76 = sq.ft  
畳(江戸間)
Mats
sq.ft.
Mat × 16.7 = sq.ft  
sq.ft × 0.06 = Mat
Please, do not use the figures given here as sole source for any commercial (or legal) purpose involving cost, money, sales, purchase etc. Any consequences thereof are the sole responsibility of the person doing the calculation.