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• 1 km=0.62 mile 1 mile=1.61 km
• 1 m=1.09 yards 1 yard=0.914 m
• 1 m=3.28 feet 1 foot=0.305 m
• 1 m=39.37 inches
• 1 cm=0.394 inch 1 inch=2.54 1 foot=30.5 cm
• 1 mm=0.039 inch

Area:

• 1hectare(ha)=10000m2
• 1 ha=2.47 acres 1 acre=0.0405 ha
• 1 m2=1.196 square yards(SY) 1 SY=0.8361 m2
• 1 m2=10.764 square feet (SF) 1 SF=0.0929 m2
• 1 cm2=0.155 square inch (SI) 1 SI=6.4516 cm2

Mass:

• 1 metric ton (t)= 1000 kilograms (kg)
• 1 metric ton (t)= 1.103 tons 1 ton=0.907 t
• 1 kg=1000 grams (g)
• 1 kg=2.205 pounds 1 pound=0.4536 kg
• 1 g =1000 milligrams (mg)
• 1 g =0.0353 ounce 1 ounce=28.35 g
• 1 g =15.432 grains
• 1 mg=approx. 0.015 grain
• 1 cubic meter (m3)=1000000 cubic cm (cm3)
• 1 m3=1.308 cubic yards 1 cubic yard=0.7646 m3
• 1 m3=35.315 cubic feet 1 cubic foot=0.0283 m3
• 1 cubic centimeter (cm3)=0.000001 m3
• 1 cm3=0.061 cubic inch 1 cubic inch=16.387 cm3
• 1 kiloliter (kl or kL)=1000 liter
• 1 kL=264.17 gallons
• 1 liter (L)=1000 milliliters (mL)
• 1 L=0.264 gallons 1 gallon=3.785 L
• 1 L=1.057 quarts 1 quart=0.946 L
• 1 mL=0.034 fluid ounce 1 fluid ounce=229.57 mL
• 1 mL=approx. 1/4 teaspoon 1 teaspoon=approx. 4 mL
• 1 quart=946 mL
• 1 pint=473 mL
• 1 second (s)=1/60 minute
• 1 millisecond (ms)=0.001 second
• F(Fahrenheit) = 9/5 C(Celsius) + 32
• C = 5/9 (F-32)

*note:
the absolute 0 is at -273 Celsius, which is the same as 0 Kelvin. Kelvin and Celsius have the same size degrees.