A SCIENTIFIC CALCULATOR

WITH 25 PHYSICAL CONSTANTS

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In addition to all common algebra and trigonometry functions, this tool has 25 physical and chemical constants. It can also perform a molecular weight calculation which may be particularly useful for chemists.

The display shows both entry and calculated result at same time. Note that execution of some of the functions requires a scripted window. If you see a warning bar in your browser, click to Allow scripted window in order to perform this function.

PHYSICAL CONSTANTS

Absolute zero
-273.15 °C

Acceleration of free fall, standard
9.80665 m/s²

Atomic mass unit
1.6605402×10^-27 kg

Avogadro constant
6.0221367×10²³ 1/mol

Base of natural logarithms
2.718281828

Boltzmann constant
1.380658×10^-23 J/K

Classical electron radius
2.81794092×10^-15 m

Electron mass
9.1093897×10^-31 kg

Electron-proton mass ratio
5.44617013×10^-4

Electronvolt
1.6021892×10^-19 J

Elementary charge
1.60217733×10^-19 C

Faraday constant
96485.309 C/mol

First radiation constant
3.7417749×10^-16 W m²

Molar gas constant
8.314510 J/mol K

Molar volume
(Ideal gas, T = 273.15 K, p = 101.325 kPa)
0.02241410 m³/mol

Newtonian constant of gravitation
6.67259×10^-11 N m²/kg²

Permeability of vacuum
12.566370614×10^-7 N/A²

Permittivity of vacuum
8.854187817×10^-12 F/m

PI
3.1415926535897932

Planck constants
6.6260755×10^-34 J s

Second radiation constant
0.01438769 m K

Solar constant
1366 W/m²

Speed of light in vacuum
299792458 m/s

Speed of sound in air at STP
340 m/s

Standard pressure
101325 Pa

Calculator is courtesy of Eni Generalic (www.periodni.com)

You can specify how to round the result (i.e what number of decimal places to display) by using Mode>Decimals menu.
The numbers can be both positive and negative. To enter negative numbers simply put the minus sign (-) before the number.
You can enter expressions containing parentheses. In this case, operations in parentheses performed first.
Besides math, this gadget lets you find atomic weight of the chemical formulas. You just need to properly capitalize the element symbols in the chemical formula. For a hydration reaction enter a plus sign (for example, CH2+H2O).
This online scientific calculator stores a list with a history of recent entries and results in the form of equations, which can be copied and pasted into your document.