Or with the Analysis Toolpak installed and your data in A1:-
=CONVERT(A1, "mi", "km")
Other conversions (Straight out of Function Help):-
CONVERT(number,from_unit,to_unit)
Number is the value in from_units to convert.
From_unit is the units for number.
To_unit is the units for the result. CONVERT accepts the following text
values (in quotation marks) for from_unit and to_unit.
Weight and mass From_unit or to_unit
Gram "g"
Slug "sg"
Pound mass (avoirdupois) "lbm"
U (atomic mass unit) "u"
Ounce mass (avoirdupois) "ozm"
Distance From_unit or to_unit
Meter "m"
Statute mile "mi"
Nautical mile "Nmi"
Inch "in"
Foot "ft"
Yard "yd"
Angstrom "ang"
Pica (1/72 in.) "Pica"
Time From_unit or to_unit
Year "yr"
Day "day"
Hour "hr"
Minute "mn"
Second "sec"
Pressure From_unit or to_unit
Pascal "Pa"
Atmosphere "atm"
mm of Mercury "mmHg"
Force From_unit or to_unit
Newton "N"
Dyne "dyn"
Pound force "lbf"
Energy From_unit or to_unit
Joule "J"
Erg "e"
Thermodynamic calorie "c"
IT calorie "cal"
Electron volt "eV"
Horsepower-hour "HPh"
Watt-hour "Wh"
Foot-pound "flb"
BTU "BTU"
Power From_unit or to_unit
Horsepower "HP"
Watt "W"
Magnetism From_unit or to_unit
Tesla "T"
Gauss "ga"
Temperature From_unit or to_unit
Degree Celsius "C"
Degree Fahrenheit "F"
Degree Kelvin "K"
Liquid measure From_unit or to_unit
Teaspoon "tsp"
Tablespoon "tbs"
Fluid ounce "oz"
Cup "cup"
U.S. pint "pt"
U.K. pint "uk_pt"
Quart "qt"
Gallon "gal"
Liter "l"
The following abbreviated unit prefixes can be prepended to any metric from_unit
or to_unit.
Prefix Multiplier Abbreviation
exa 1E+18 "E"
peta 1E+15 "P"
tera 1E+12 "T"
giga 1E+09 "G"
mega 1E+06 "M"
kilo 1E+03 "k"
hecto 1E+02 "h"
dekao 1E+01 "e"
deci 1E-01 "d"
centi 1E-02 "c"
milli 1E-03 "m"
micro 1E-06 "u"
nano 1E-09 "n"
pico 1E-12 "p"
femto 1E-15 "f"
atto 1E-18 "a"