Conversion Factors

DataGraph has over 100 defined constants that can be used to convert axis values from one unit of measure to another, without you having to enter any conversion factors. They include length, area, volume, time, and more.  

These constants are used in the unit conversion in the Extra Axis command. Add an Extra Axis command to your graph and change the Units to ‘Convert’ to use this functionality. Then you will have two new entry boxes named Data and Display.

One use case for this functionality is to provide two units of measure for a set of data. For example, below we are graphing data in feet square, but we also want to show meters square on the right.

To create this graph, the Extra Axis options are Units = ‘Convert’ and Position =  ‘Right’.  The defined constants are entered such that Data is set to ‘sqft’ and Display is set to ‘sqm’.

Some of the constants have more than one symbol defined. For example, a gallon can be understood as ‘gal’, ‘gallon’, or ‘gallons’. If you enter a symbol that is not defined a warning will be displayed that lists all of the symbolic constants that have been defined.

You can think of each of these constants as built-in variables that represent a conversion factor based on SI units. For example, the value for meters ‘m’ is one since meters are the SI unit for length. The value for ‘cm’ is 0.01 since cm is one-one hundredth of the meter. The data conversion is done by multiplying by the ratio of Data/Display to show the requested units.

Note: DataGraph will not warn you if you pick a combination of units that don’t make physical sense (i.e., converting from volume to mass), so always double-check! A list of all the defined constants is provided below.

key	value	Description
A	1	Current
acre, acres	4046.8564224	Area
atm	101325	Pressure (standard atmosphere)
Å,å	1E-10	Length
at	98066.5	Pressure (technical atmosphere)
bar, bars	1E+05	Pressure
barye	0.1	Pressure 1 barye = 0.1 Pa  = 1 g·cm−1s−2
biot,biots	3.33564E-10	Electromagnetic (cgs units)
BTU	1054.615	Work, British thermal unit
C, coulomb, coulombs	1	SI unit of electric charge, A*sec
centimeter, centimeters, centimetre	0.01	Length
cfs	0.028316846592	cubic feet per second
cm	0.01	centimeter
cuft	0.028316846592	cubic feet
cuin	1.6387064E-05	cubic inches
cukm	1E+09	cubic kilometers
cum	1	cubic meters
cumiles	4168181825.44058	Volume, cubic miles
cuyd	0.764554857984	volume, cubic yards
cwt	45.359237	hundredweight
day, days	86400	in seconds
deg, degree, degrees	0.0174532925199433	Angle in radians
dyn,dyne	1E-05	cgs unit of force1 dyne = 1 g·cm/s2
erg	1E-07	cgs unit of work1 erg = 1 dynecm = 1 g·cm2/s2
feet, ft, foot	0.3048	Length
floz	2.957353E-05	Volume
fm	1E-15	femtometer
furlong	201.168	Length
g, gr, gram, grams	0.001	Mass
gal, gallon, gallons	0.003785411784	Volume
G, gauss	0.0001	Gauss, strength of magnetic field
grain, grains	6.479891E-05	Mass
h, hr, hour, hours	3600	in seconds
H	1	henry, SI unit of electrical inductance
hectare, hectares	10000	area
hp	745.6998715822702	Horsepower
imperialgallon, imperialgallons	0.00454609	Volume
in,inch,inches	0.0254	Length
J	1	Joule
kayser, kaysers	100	wavenumber, formerly called the kayser
kg, kilo, kilos, kilogram, kilograms	1	Mass
mph	0.2777777…	Length/Time
kip,kips	4448.2216	Imperial unit of force
km	1000	Length, kilometers
kN	1000	kiloNewtons
knot,knots	0.514434666…	Length/Time
kPa	1000	kiloPascals
kW	1000	kiloWatt
L, l, liter, liters, litre	0.001	Volume
lb,lbs	0.45359237	Weight
league, leagues	4828.032	Length
mach,Mach	340.4014189333333	Length/Time
mA, ms, mV, mW, mΩ	0.001	1/thousand of an SI unit
maxwell	1E-07	derived CGS unit of magnetic flux
m, meters, meter, metre	1	Length, meter
mg	1E-06	milligram
mi,mile,miles	1609.344	Length
min, minute, minutes	60	Time
ml	1E-06	Volume
mm	0.001	Length, millimeter
MMBtu, mmBTU	1054615000	One million British Thermal Units (BTU)
mmHg	133.322	Pressure
N_A	6.02214085774E+23	Avogadro’s Number
MPa	10^6	Pressure
mph	0.44704	speed
nA,nm,ns,nV,nΩ	1E-09	1/billionth of SI unit
N	1	Newtons
Oe, oersted	79.577	Auxiliary magnetic field Hin the CGSunits
oz	0.0283493	Weight
Pa	1	Pressure, SI unit, Pascal
pdl	0.138255	Force, English units, poundal
pt, pint, pints	0.0004731	Volume
pm, pV, pΩ	1E-12	pico conversion
poise	0.1	dynamic viscosity cgs units
pound,pounds	0.4535888	Weight
psi	6894.76	Pressure
quart	0.000946352946	Volume
s, sec, second, seconds	1	Time
sqft	0.09290304	Area, square feet
sqkm	10^6	Area, square kilometers
sqm	1	Area, square meters
sqmile, sqmiles	2589988.110336	Area, square miles
sqyd	0.836127	Area, square yards
statC, statcoulomb, esu, Fr	3.33564E-10	cgs, electrostatic unit of charge
statH	898800000000	unit of inductance in cgs
statV, statvolt,, statvolts	299.792458	Unit of electromotive force (EMF) or potential difference in cgs
stone,stones	6.3502432	Weight, English units
T	1	Tesla, strength of magnetic field
torr	133.322	pressure
ukfloz	2.8413E-05	UK Fluid Ounces
ukgal, ukgals, ukgallon	0.00454608	UK Gallon
ukpint, ukpints, ukpt	0.00056826	UK Pint
ukquart	0.001136	UK quart
V	1	Volt, derived SI unit for electric potential
W	1	Watt
Wb,weber	1	SI unit of magnetic flux
week, weeks	604800	time
yard,yards,yd	0.9144	Length
º	0.0174532925199433	1 degree in radians
µA,µg,µm,µs,µV,µW,µΩ	1E-06	micro conversion
Ω	1	Electrical resistance, Ohm