Math Touch

Units

Equations

Astronomical Observations

Units included in the default unit database.

(SI prefixes are recognized automatically.)

Users can add new units and modify definitions.

Dimensionless

• ()
• pi (π)
• Euler’s-constant (ℇ)
• radian (rad) radians
• steradian (sr) steradians
• percent (%)

Length (L)

• meter (m) meters
• centimeter (cm) centimeters
• inch (in) inches
• foot (ft) feet
• yard (yd) yards
• mile (mile) miles
• nautical-mile (nmi) nautical-miles
• astronomical-unit (AU) astronomical-units
• ångström (Å) ångströms
• kilometer (km) kilometers

Time (T)

• second (s) seconds
• minute (min) minutes
• hour (hr) hours
• day (dy) days
• year (yr) years

Mass (M)

• kilogram (kg) kilograms
• gram (g) grams
• slug (slug) slugs
• electon’s-mass (m-e)
• proton’s-mass (m-p)
• neutron’s-mass (m-n)
• pound-mass (lbm) pounds-mass
• atomic-mass-unit (u) atomic-mass-units
• dalton (Da) daltons

Charge (C)

• coulomb (C) coulombs
• electron’s-charge (ce)
• proton’s-charge (proton’s-charge)

Angle (An)

• radian (rad) radians
• steradian (sr) steradians
• degree (°) degrees
• arcminute (‘)
• arcsecond (“)

Temperature (Tp)

• kelvin (K) kelvins
• rankine (°R)
• celcius (°C)
• fahrenheit (°F)

Amount-of-Substance (AoS)

• mole (mol) moles

Currency ($)

• dollar ($) dollars

Luminous-Intensity (LI)

• candela (cd) candelas

Memory (Mem)

• bit (b) bits
• byte (B) bytes
• kibibyte (KiB) kibibytes
• mebibyte (MiB) mebibytes
• gibibyte (GiB) gibibytes
• tebibyte (TiB) tebibytes
• pebibyte (PiB) pebibytes
• exbibyte (EiB) exbibytes
• zebibyte (ZiB) zebibytes
• yobibyte (YiB) yobibytes

Optical-power

(1 / L)


• diopter (diopter) diopters

Speed (S)

(L / T)


• mile-per-hour (mph) miles-per-hour
• knot (knot) knots
• speed-of-light (c)

Acceleration (Ac)

(L / T²)


• Earth-surface-gravity (g’s) g’s
• galileo (Gal) galileos

Jerk

(L / T³)


Angular-Velocity

(An / T)


Angular-Acceleration

(An / T²)


Area

(L²)


• acre (acre) acres
• barn (barn) barns
• darcy

Volume (V)

(L³)


• liter (L) liters
• teaspoon (tsp) teaspoons
• tablespoon (tbsp) tablespoon
• fluid-ounce (fl-oz) fluid-ounces
• shot (shot) shots
• cup (cup) cups
• pint (pint) pints
• quart (quart) quarts
• gallon (gal) gallons
• gallon (gal) gallons
• peck (peck) pecks
• bushel (bushel) bushels
• cubic-centimeter (cc) cubic-centimeters

Second-Moment-of-Area

(L⁴)


Density

(M / L³)


Frequency

(1 / T)


• hertz (Hz) hertz

Bandwidth

(Mem / T)


Momentum

(L M / T)


Moment-of-Inertia

(L² M)


Force (F)

(L M / T²)


• newton (N) newtons
• pound (lb) pounds
• dyne (dyn) dynes
• ounce (oz) ounces

Energy

(L² M / T²)


• joule (J) joule
• electron-volt (eV) electron-volts
• calorie (cal) calories
• erg (erg) ergs

Power

(L² M / T³)


• watt (W) watts
• horsepower (hp) horsepower

Angular-Momentum

(L² M / T)


• Planck-constant (ℎ)
• reduced-Planck-constant (ℏ)

Pressure

(M / L T²)


• pascal (Pa) pascals
• Earth-surface-pressure (atm) atmospheres
• bar (bar) bars
• pound-per-square-inch (psi) pounds-per-square-inch
• torr (Torr) torr
• millimeters-of-mercury (mmHg) millimeters-of-mercury

Dynamic-Viscosity

(M / L T)


• poise (P) poises

Kinematic-Viscosity

(L² / T)


Heat-Capacity

(L² M / T² Tp)


• Boltzmann’s-constant (kb)

Specific-Heat-Capacity

(L² / T² Tp)


Electric-Current

(C / T)


• ampere (A) amperes

Electric-Current-Density

(C / L³ T)


Electric-Charge-Line-Density

(C / L)


Electric-Charge-Surface-Density

(C / L²)


Electric-Charge-Density

(C / L³)


Electric-Field

(L M / C T²)


Electric-Potential

(L² M / C T²)


• volt (V) volts

Electric-Resistance

(L² M / C² T)


• ohm (Ω) ohms

Electric-Resistivity

(L³ M / C² T)


Electric-Conductance

(C² T / L² M)


• siemens (S) siemens
• mho (℧) mhos

Electric-Conductivity

(C² T / L³ M)


Electric-Capacitance

(C² T² / L² M)


• farad (F) farads

Electric-Permittivity

(C² T² / L³ M)


• vacuum-permittivity (ε₀)

Magnetic-Flux

(L² M / C T)


• weber (Wb) webers
• maxwell (Mx) maxwells

Magnetic-Flux-Density

(M / C T)


• tesla (T) teslas
• gauss (Gs) gauss
• oersted (Oe) oersteds

Magnetic-Inductance

(L² M / C²)


• henry (H) henrys

Luminance

(LI / L²)


Inverse-AoS

(1 / AoS)


• Avogadro’s-number (NA)

Gravitational-constant

(L³ / M T²)


• Newton’s-G (G)

Magnetic-permeability

(L M / C²)


• vacuum-permeability (µ₀)

Thermodynamic-conversion

(L² M / AoS T² Tp)


• gas-constant (R)

Stefan-scaling

(M / T³ Tp⁴)


• Stefan-Boltzmann-constant (σ)

Molar-mass

(M / AoS)


Force-potential

(L² / T²)


Spring-constants

(M / T²)


Gravitational-parameter

(L³ / T²)


Thermal-Conductivity

(L M / T³ Tp)

Properties

Orbital semimajor-axis, Orbital period, Orbital inclination, Orbital eccentricity, Equitorial radius, Polar radius, Mean Radius, Mass, Average Density, Gravitational parameter, Surface gravitational acceleration, surface atmospheric, density, albedo, orbital solar power flux, sidereal rotation period, sidereal rotation rate, axis-orbit inclination, escape velocity

Not all properties available for all bodies. Users can add new observations to bodies.

Bodies:

Sun

Mercury, Venus, Earth, Mars, Jupiter, Saturn, Neptune, Uranus

Eris, Ceres, Pluto

Moon, Deimos, Phobos, Io, Europa, Ganymede, Callisto, Amalthea, Himalia, Elara, Pasiphae, Sinope, Lysithea, Carme, Ananke, Leda, Thebe, Adrastea, Metis, Mimas, Enceladus, Tethys, Dione, Rhea, Titan, Hyperion, Iapetus, Phoebe, Janus, Epimetheus, Helene, Telesto, Calypso, Atlas, Prometheus, Pandora, Pan, Ymir, Paaliaq, Tarvos, Ijiraq, Kiviuq, Albiorix, Erriapo, Siarnaq, Ariel, Umbriel, Titania, Oberon, Miranda, Cordelia, Ophelia, Bianca, Cressida, Desdemona, Juliet, Portia, Rosalind, Belinda, Puck, Caliban, Sycorax, Prospero, Setebos, Stephano, Trinculo, Ferdinand, Francisco, Margaret, Triton, Nereid, Naiad, Thalassa, Despina, Galatea, Larissa, Proteus, Halimede, Psamathe, Sao, Laomedeia, Neso, Charon, Nix, Hydra