Unit Conversion and Metrix Prefixes — ConvUnit • DescTools

Converts a numerical vector from one measurement system to another. Metric prefixes (as unit prefixes that precede a basic unit of measure to indicate a multiple or fraction of the unit) are respected.

CmToPts(x)
PtsToCm(x)

ConvUnit(x, from, to)

data(d.units)
data(d.prefix)

Arguments

x: the numeric to be converted.
from: a character defining the original unit.
to: a character defining the target unit.

Details

The two functions CmToPts() and PtsToCm() convert centimeters to points and vice versa. 1 cm corresponds to 28.35 points.

The units as defined by the International System of Units (SI) (m, g, s, A, K, mol, cd, Hz, rad, sr, N, Pa, J, W, C, V, F, Ohm, S, Wb, T, H, lm, lx, Bq, Gy, Sv, kat, l) can be used to convert between different prefixes. The following non SI-units can be chosen for conversion between different systems. NA will be returned if a conversion can't be found.
The function is using the conversion factors stored in the dataset d.units.

		Weight and mass
		Gram
g	metric	Pound mass (avoirdupois)
lb	Ounce mass (avoirdupois)	oz
Metric ton	ton (or tn)
Distance		Meter
m	metric	Statute mile
mi	Nautical mile	nmi
Inch	in	Foot
ft	Yard	yd
Angstrom	AA	(accepted) metric
Astronomical unit	au

Time		Year
a	Day	d
Hour	h	Minute
min	Second	s
	Pressure
Pascal	Pa	Atmosphere
atm	mm of Mercury	mmHg
bar	bar	Pound-force per quare inch
psi
	Energy
Joule	J	metric
IT calorie	cal	(accepted) metric
Electron volt	eV (or ev)

Power		Horsepower (mechanical)
hp	Horsepower (metric)	HP
Watt	W (or w)	metric

Temperature		Degree Celsius
C	Degree Fahrenheit	F
Kelvin	K	metric
	Liquid measure
Fluid ounce	fl oz	Gallon
gal	Liter	l (or lt)

Additional details can be found in the d.units data.frame.

Author

Andri Signorell <andri@signorell.net>

Examples

ConvUnit(c(1.2, 5.4, 6.7), "in", "m")
#> [1] 0.03048 0.13716 0.17018

# from kilometers to pico meters
ConvUnit(1, from="km", to="pm")
#> [1] 1e+15

# from miles to kilometers
ConvUnit(1, from="mi", to="km")
#> [1] 1.609344
# nautical miles
ConvUnit(1, from="nmi", to="km")
#> [1] 1.852
# from kilo Kelvin to Fahrenheit
ConvUnit(10, from="kK", to="F")
#> [1] 18523.67
# from metric to more quirky units
ConvUnit(c(10, 1), from="hl", to="gal")
#> [1] 264.17205  26.41721
ConvUnit(500, from="ml", to="fl oz")
#> [1] 16.90674

# conversion between non-SI units
ConvUnit(1000, "yd", "mi")
#> [1] 0.5679333
# ... must be the same as
ConvUnit(ConvUnit(1000, "yd", "m"), "m", "mi")
#> [1] 0.5679333