Scientific calculator

How to use this scientific calculator

Typing your expression

You can either type in your expression using your computer keyboard, or using the on-screen buttons. The expression is always calculated as-you-type, and therefore there is no equal sign button.

Result field

The result is shown below your expression. It is displayed with 10 significant figures. If your expression can not be calculated you will see an error description instead of the answer.

Working with memory / history

When you press (or click on) Enter, the calculated expression will show up in the log to the right, and the input field will be cleared, ready for a new expression. You can use Ans to access the last answer, and prev to step back to previous operations. Alternatively, you can use the up/down arrow keys (like in a typical command line environment) on your keyboard to go back to previous operations (and Shift+up/down to go to old answers). In every log entry, there are two small on-screen buttons which allow you to go back to specific operations without stepping through the entire log: for returning to the operation, and for inserting the answer.

Expression syntax

The calculator is very robust when it comes expression syntax. You don't have to insert multiplication signs or zeroes that are obvious: for instance, .5(3+2)pi is the same as 0.5*(3+2)*pi. The operators symbols are:

Symbol	Operation
^	To the power of
/	Division
*	Multiplication
-	Subtraction
+	Addition

Their priority is in this specified order, with the top ones being processed before the bottom ones.
Note that both point (.) and comma (,) count as decimal symbols.

Fraction

With the Frac button, you can change the current answer to fraction format. The calculator then searches for a fraction that matches the decimal answer to 7 significant figures. The Frac button has effect only on non-integers ranging from 1E-9 to 1E10.

Functions

As expected of any scientific calculator, the CalcBuddy online calculator provides the most common functions. Below is a reference table for them:

Symbol	Function name
sqrt( )	square root
cbrt( )	cube root
abs( )	absolute value
log( )	logarithm with base 10
ln( )	logarithm with base e
log2( )	logarithm with base 2
sin( )	sine
cos( )	cosine
tan( )	tangent
sinh( )	hyperbolic sine
cosh( )	hyperbolic cosine
tanh( )	hyperbolic tangent
arcsin( )	inverse sine
arccos( )	inverse cosine
arctan( )	inverse tangent

Constants

CalcBuddy also provides 30 scientific constants to simplify calculations in for instance physics and chemistry. A reference table below:

Symbol	Constant name	Value	Unit
pi	pi	3.141592653589793	none
e	e, Euler's number	2.718281828459045	none
Re	Radius of Earth	6.37814E6	m
Rm	Radius of Moon	1.73814E6	m
Rs	Radius of Sun	6.955E8	m
Rem	Distance Earth - Moon	3.84403E8	m
AU	Astronomical Unit	1.495978707E11	m
ly	Lightyear	9.460528405E15	m
pc	Parsec	3.08568025E16	m
Me	Mass of Earth	5.974E24	kg
Mm	Mass of Moon	7.3477E22	kg
Ms	Mass of Sun	1.9891E30	kg
mu	Atomic mass unit	1.660539E-27	kg
mp	Proton rest mass	1.672622E-27	kg
mn	Neutron rest mass	1.674927E-27	kg
me	Electron rest mass	9.109382E-31	kg
G	Gravitational constant	6.67428E-11	Nkg2m-2
g	Standard acceleration of gravity	9.80665	ms-2
c	Speed of light	2.99792458E8	ms-1
h	Planck's constant	6.626069E-34	Js
qe	Elementary charge	1.6021765E-19	C
eV	Electron volt	1.6021765E-19	J
eo	Electric constant	8.854187817E-12	C2N-1m-2
uo	Magnetic constant	1.2566370614E-6	NA-2
F	Faraday's constant	96485.34	Cmol-1
Na	Avogadro's number	6.022142E23	mol-1
R	Ideal gas constant	8.31447	Jmol-1K-1
k	Boltzmann's constant	1.38065E-23	JK-1
Co	0°Celsius in Kelvin	273.15	K
atm	Atmosphere	101325	Pa

Settings

Below the calculator you can select angle unit, and whether or not the keyboard input should be enabled. For mobile device browsers, it's a good idea to not have keyboard enabled, since you will then get "sucked into" the input field. Insert at cursor makes your button click inputs appear at the current cursor position inside the expression. it also lets you select a span of text and insert function around that span. Inserting at cursor in disabled in Internet Explorer.