conv_unit {measurements}

Convert Units of Measurement

Description

Converts common units of measurement for a variety of dimensions. See conv_unit_options for all options.

Usage

conv_unit(x, from, to)

Arguments

x

a numeric vector giving the measurement value in its original units.

from

the unit in which the measurement was made.

to

the unit to which the measurement is to be converted.

Details

Acceleration

mm_per_sec2, cm_per_sec2, m_per_sec2, km_per_sec2, grav, inch_per_sec2, ft_per_sec2, mi_per_sec2, kph_per_sec, mph_per_sec

Angle

degree, radian, grad, arcmin, arcsec, turn

Area

nm2, um2, mm2, cm2, m2, hectare, km2, inch2, ft2, yd2, acre, mi2, naut_mi2

Coordinate

dec_deg, deg_dec_min, deg_min_sec (see note)

Count

fmol, pmol, nmol, umol, mmol, mol

Duration

nsec, usec, msec, sec, min, hr, day, wk, mon, yr, dec, cen, mil, Ma

Energy

J, kJ, erg, cal, Cal, Wsec, kWh, MWh, BTU

File size

byte, KB, MB, GB, TB, PB, bit, Kbit, Mbit, Gbit, Tbit, Pbit

Flow

ml_per_sec, ml_per_min, ml_per_hr, l_per_sec, l_per_min, l_per_hr, m3_per_sec, m3_per_min, m3_per_hr, gal_per_sec, gal_per_min, gal_per_hr, ft3_per_sec, ft3_per_min, ft3_per_hr, Sv

Length

angstrom, nm, um, mm, cm, dm, m, km, inch, ft, yd, fathom, mi, naut_mi, au, light_yr, parsec, point

Mass

Da, fg, pg, ng, ug, mg, g, kg, Mg, Gg, Tg, Pg, carat, metric_ton, oz, lbs, short_ton, long_ton, stone

Power

uW, mW, W, kW, MW, GW, erg_per_sec, cal_per_sec, cal_per_hr, Cal_per_sec, Cal_per_hr, BTU_per_sec, BTU_per_hr, hp

Pressure

uatm, atm, Pa, hPa, kPa, torr, mmHg, inHg, cmH2O, inH2O, mbar, bar, dbar, psi

Speed

mm_per_sec, cm_per_sec, m_per_sec, km_per_sec, inch_per_sec, ft_per_sec, kph, mph, km_per_day, mi_per_day, knot, mach, light

Temperature

C, F, K, R

Torque

N-m, ft-lbs, inch-lbs

Volume

ul, ml, dl, l, cm3, dm3, m3, km3, us_tsp, us_tbsp, us_oz, us_cup, us_pint, us_quart, us_gal, inch3, ft3, mi3, imp_tsp, imp_tbsp, imp_oz, imp_cup, imp_pint, imp_quart, imp_gal

The conversion values have been defined based primarily from international weight and measurement authorities (e.g. General Conference on Weights and Measures, International Committee for Weights and Measures, etc.). While much effort was made to make conversions as accurate as possible, you should check the accuracy of conversions to ensure that conversions are precise enough for your applications.

Note

Duration

Years are defined as 365.25 days and months are defined as 1/12 a year.

Coordinate

Values must be entered as a string with one space between subunits (e.g. 70° 33’ 11” = "70 33 11").

Energy

cal is a thermochemical calorie (4.184 J) and Cal is 1000 cal (kcal or 4184 J).

Flow

All gallon-based units are US gallons.

Mass

All non-metric units are based on the avoirdupois system.

Power

hp is mechanical horsepower, or 745.69 W.

Pressure

cmH2O is defined at 4 °C.

Pressure

inH2O is defined at 60 °F.

Speed

mach is calculated at sea level at 15 °C.

Author(s)

Matthew A. Birk, [e-mail]

See Also

conv_unit_options, conv_dim

Examples

conv_unit(2.54, "cm", "inch") # Result = 1 inch

conv_unit(seq(1, 10), "kg", "short_ton") # A vector of measurement values can be converted

# Convert 1, 10, and 100 meters to all other length units
sapply(conv_unit_options$length, function(x) conv_unit(c(1, 10, 100), "m", x))

conv_unit("33 1 1", "deg_min_sec", "dec_deg")

conv_unit(c("101 44.32","3 19.453"), "deg_dec_min", "deg_min_sec")