Units
Math Notepad supports units. Units can be used in basic arithmetic
operations like add and subtract, and units can be converted from
one to another.
All available units are listed in the table below.
| Base |
Unit |
| Length |
meter (m), inch (in), foot (ft), yard (yd), mile (mi), link (li), rod (rd), chain (ch), angstrom, mil |
| Surface |
m2, sqin, sqft, sqyd, sqmi, sqrd, sqch, sqmil |
| Volume |
m3, litre (l, L, lt, liter), cc, cuin, cuft, cuyd, teaspoon, tablespoon |
| Liquid volume |
minim (min), fluiddram (fldr), fluidounce (floz), gill (gi), cup (cp), pint (pt), quart (qt), gallon (gal), beerbarrel (bbl), oilbarrel (obl), hogshead, drop (gtt) |
| Angles |
rad, deg, grad, cycle |
| Time |
second (s), seconds, minute (minutes), hour (h, hours), day (days) |
| Mass |
gram(g), tonne, ton, grain (gr), dram(dr), ounce (oz), poundmass (lbm, lb, lbs), hundredweight (cwt), stick, stone |
| Electric current |
ampere (A) |
| Temperature |
kelvin (K), celsius (degC), fahrenheit (degF), rankine (degR) |
| Amount of substance |
mole (mol) |
| Luminous intensity |
candela (cd) |
| Force |
newton (N), dyne (dyn), poundforce (lbf) |
| Energy |
joule (J), erg, Wh, BTU, electronvolt (eV) |
| Power |
watt (W), hp |
| Pressure |
Pa, psi, atm |
| Electricity and magnetism |
ampere (A), coulomb (C), watt (W), volt (V), ohm, farad (F), weber (Wb), tesla (T), henry (H), siemens (S), electronvolt (eV) |
| Binary |
bit (b), byte (B) |
Note that all relevant units can also be written in plural form, for example 5 meters instead of 5 meter or 10 seconds instead of 10 second.
Surface and volume units can alternatively be expressed in terms of length units raised to a power, for example 100 in^2 instead of 100 sqin.
Prefixes
The following decimal prefixes are available.
| Name |
Abbreviation |
Value |
| deca |
da |
1e1 |
| hecto |
h |
1e2 |
| kilo |
k |
1e3 |
| mega |
M |
1e6 |
| giga |
G |
1e9 |
| tera |
T |
1e12 |
| peta |
P |
1e15 |
| exa |
E |
1e18 |
| zetta |
Z |
1e21 |
| yotta |
Y |
1e24 |
| Name |
Abbreviation |
Value |
| deci |
d |
1e-1 |
| centi |
c |
1e-2 |
| milli |
m |
1e-3 |
| micro |
u |
1e-6 |
| nano |
n |
1e-9 |
| pico |
p |
1e-12 |
| femto |
f |
1e-15 |
| atto |
a |
1e-18 |
| zepto |
z |
1e-21 |
| yocto |
y |
1e-24 |
The following binary prefixes are available.
They can be used with units bit (b) and byte (B).
| Name |
Abbreviation |
Value |
| kibi |
Ki |
1024 |
| mebi |
Mi |
1024^2 |
| gibi |
Gi |
1024^3 |
| tebi |
Ti |
1024^4 |
| pebi |
Pi |
1024^5 |
| exi |
Ei |
1024^6 |
| zebi |
Zi |
1024^7 |
| yobi |
Yi |
1024^8 |
| Name |
Abbreviation |
Value |
| kilo |
k |
1e3 |
| mega |
M |
1e6 |
| giga |
G |
1e9 |
| tera |
T |
1e12 |
| peta |
P |
1e15 |
| exa |
E |
1e18 |
| zetta |
Z |
1e21 |
| yotta |
Y |
1e24 |
Physical Constants
Math Notepad includes the following physical constants. See Wikipedia for more information.
Universal constants
| Name |
Symbol |
Value |
Unit |
| speedOfLight |
c |
299792458 |
m · s-1 |
| gravitationConstant |
G |
6.6738480e-11 |
m3 · kg-1 · s-2 |
| planckConstant |
h |
6.626069311e-34 |
J · s |
| reducedPlanckConstant |
h |
1.05457172647e-34 |
J · s |
Electromagnetic
| Name |
Symbol |
Value |
Unit |
| magneticConstant |
μ0 |
1.2566370614e-6 |
N · A-2 |
| electricConstant |
ε0 |
8.854187817e-12 |
F · m-1 |
| vacuumImpedance |
Z0 |
376.730313461 |
Ω |
| coulomb |
κ |
8.9875517873681764e9 |
N · m2 · C-2 |
| elementaryCharge |
e |
1.60217656535e-19 |
C |
| bohrMagneton |
μB |
9.2740096820e-24 |
J · T-1 |
| conductanceQuantum |
G0 |
7.748091734625e-5 |
S |
| inverseConductanceQuantum |
G0-1 |
12906.403721742 |
Ω |
| magneticFluxQuantum |
f0 |
2.06783375846e-15 |
Wb |
| nuclearMagneton |
μN |
5.0507835311e-27 |
J · T-1 |
| klitzing |
RK |
25812.807443484 |
Ω |
Atomic and nuclear constants
| Name |
Symbol |
Value |
Unit |
| bohrRadius |
a0 |
5.291772109217e-11 |
m |
| classicalElectronRadius |
re |
2.817940326727e-15 |
m |
| electronMass |
me |
9.1093829140e-31 |
kg |
| fermiCoupling |
GF |
1.1663645e-5 |
GeV-2 |
| fineStructure |
α |
7.297352569824e-3 |
- |
| hartreeEnergy |
Eh |
4.3597443419e-18 |
J |
| protonMass |
mp |
1.67262177774e-27 |
kg |
| deuteronMass |
md |
3.3435830926e-27 |
kg |
| neutronMass |
mn |
1.6749271613e-27 |
kg |
| quantumOfCirculation |
h / (2me) |
3.636947552024e-4 |
m2 · s-1 |
| rydberg |
R∞ |
10973731.56853955 |
m-1 |
| thomsonCrossSection |
|
6.65245873413e-29 |
m2 |
| weakMixingAngle |
|
0.222321 |
- |
| efimovFactor |
|
22.7 |
- |
Physico-chemical constants
| Name |
Symbol |
Value |
Unit |
| atomicMass |
mu |
1.66053892173e-27 |
kg |
| avogadro |
NA |
6.0221412927e23 |
mol-1 |
| boltzmann |
k |
1.380648813e-23 |
J · K-1 |
| faraday |
F |
96485.336521 |
C · mol-1 |
| firstRadiation |
c1 |
3.7417715317e-16 |
W · m2 |
| loschmidt |
n0 |
2.686780524e25 |
m-3 |
| gasConstant |
R |
8.314462175 |
J · K-1 · mol-1 |
| molarPlanckConstant |
NA · h |
3.990312717628e-10 |
J · s · mol-1 |
| molarVolume |
Vm |
2.241396820e-10 |
m3 · mol-1 |
| sackurTetrode |
|
-1.164870823 |
- |
| secondRadiation |
c2 |
1.438777013e-2 |
m · K |
| stefanBoltzmann |
σ |
5.67037321e-8 |
W · m-2 · K-4 |
| wienDisplacement |
b |
2.897772126e-3 |
m · K |
Note that the values of loschmidt and molarValue are at T = 273.15 K and p = 101.325 kPa.
The value of sackurTetrode is at T = 1 K and p = 101.325 kPa.
Adopted values
| Name |
Symbol |
Value |
Unit |
| molarMass |
Mu |
1e-3 |
kg · mol-1 |
| molarMassC12 |
M(12C) |
1.2e-2 |
kg · mol-1 |
| gravity |
gn |
9.80665 |
m · s-2 |
| atm |
atm |
101325 |
Pa |
Natural units
| Name |
Symbol |
Value |
Unit |
| planckLength |
lP |
1.61619997e-35 |
m |
| planckMass |
mP |
2.1765113e-8 |
kg |
| planckTime |
tP |
5.3910632e-44 |
s |
| planckCharge |
qP |
1.87554595641e-18 |
C |
| planckTemperature |
TP |
1.41683385e+32 |
K |
