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table of contents
Calculator Tab is a
free online
scientific
calculator which
works like your
regular calculator.
One feature that
sets it appart from
other calculators is
that it's memory
bank can store an
unlimited amount of
numbers and
descriptions of
these numbers for an
indefinite length of
time. The stored
numbers can be
sorted by date, by
the number of uses
or by name. Your
saved numbers and
their respective
descriptions are
saved directly on
your computer, never
entering the sphere
of the internet, so
that they are as
secure as your
workstation.
This calculator
follows the standard
order of operations.
It can handle values
from 4.9e-324 to
1.7e+308. To perform
a calculation, press
the calculator
buttons with the
mouse as you would
write the symbols of
the calculation. For
example to calculate
2 + 5 * 8 press the
buttons
     .
To see the result
(which in this case
will be 42) and to
terminate the
calculation press
the
 button.
The exception to
this approach is
when using
mathematical
functions which only
take one value: in
these functions, the
value always comes
before the function.
For more details see
the section "Functions
with one (x) value"
below. To be able to
use your keyboard
instead of the
mouse, you must
first click anywhere
on the calculator
with the mouse.
Calculator Tab will
not allow you to
make ambiguous
enteries and will
tell you, what is
not allowed if you
try to make such an
entry. If you, for
example, try to
enter
 the
entry of
will
generate an error
telling you, that
you first need to
enter a number
before continuing
with the
calculation. The
entry of
will
be ignored and you
can continue with
your calculation as
though you had not
entered it. This way
you can always be
sure about what
exactly the
calculator is doing.
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-
unlimited
long-term memory
storage
-
pop-up version
(for working
with other
documents)
-
saving of
settings between
sessions
-
highlighting of
the last valid
function
-
possibility of
switching
between comma
and point as
decimal
separators
-
ambiguous input
filter
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Using the memory
function
There are two
possibilities to
store a value in the
memory bank:
1.
Using the
 button
you can quickly
store the displayed
value in the memory
bank. You don't need
to enter a
description.
2.
Using the
 you
can store the
displayed value in
the memory bank and
add your own
description, which
can be up to 64
characters long.
To
open the memory bank
press this button:
The memory bank will
open and you will
see your saved
values. You can only
see three values at
a time. If you have
more then tree
values saved, you
can use the scroll
bar to the right of
the saved values to
scroll through the
memory bank. To
insert a saved value
into the calculator,
click on the value
or the grey field
surrounding it. To
erase a value click
on the
 button
beside the
corresponding value.
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There are 2
possibilities to
enter a negative
number:
1.
Press the
 button
before pressing the
number button. For
example to calculate
2 + (-5) press the
buttons
.
2.
Or press the
 button
after the number
button. For the same
calculation as above
press the buttons
.
Making a bracket
negative can
only be accomplished
using the first
method, because the
button
can only change the
sign of the last
entered value. If
you try to change
the sign of a
bracket using the
button,
you will get an
error message.
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Functions which
include only the
letter "x" are used
in the following
fashion:
[value X] [Function],
meaning that the
value is always
entered before the
function. For
example to enter
sin(30) press the
buttons
   .
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Functions which
include the letters
"x" and "y" are used
in the following
fashion:
[value X] [Function]
[value Y].
For example to enter
53
(5 cubed) press the
buttons
 .
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Using the percentage
buttons
 and
 ,
you can calculate
either the
percentage of a
certain number, or
what percentage of a
certain number
another number
constitutes. The
labels of the
percentage buttons
are meant as
mnemonics. To
calculate 5% of 50
(which is 2.5) enter
.
Here the mnemonic is
clear: 5% (of) 50 is
reflected in the
label "x % y".
If
on the other hand
you want to know how
many percent of 50
the value of 5
constitues, use the
button
.
Here the mnemonic
is: (How many) %
(of) 50 (is) 5,
which is reflected
in the label "% y
x". Keep in mind
though, that the
value of "x" comes
before the value of
"y" as explained
above in the section
"Functions
with two (x and y)
values".
Accordingly, in
order to calculate
how many percent of
50 the value of 5
constitutes (which
is 10%), enter
.
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To
select your options
for various
settings, press the
 button.
To turn to the next
page of options
press the
 button.
To save your
settings press the
 button.
To cancel any
changes you have
made press the
button.
Decimal-separator
You can select,
whether a point or a
comma should be used
as a decimal
separator.
Order of saved
values
You can select, how
your saved values
should be ordered:
by date (most recent
first); by most used
(values used more
frequently appear
first); or by
alphabet (values
with descriptions
first in the
alphabet will appear
first).
Descriptions on
roll-over
You can select,
whether a short
description of the
fuctionality should
appear, when you
hover over a button.
As you get more
familiar with the
calculator, you
might not need this
feature.
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Keyboard
shortcuts
Once you have
clicked inside the
calculator, you can
use your number
buttons and fuction
buttons like on any
other calculator.
Additionally, you
then have the
following shortcuts
at your disposal:
|
Key |
Function |
|
[enter] |
is equal to
-or-
enter/return |
|
= |
is equal to |
|
[insert] |
save a value
without
custom
description |
|
i |
save a value
with custom
description |
|
m |
open/close
memory bank |
|
o |
options |
|
a |
open/close
left side
functions |
|
s |
open/close
bottom side
functions |
|
[backspace] |
backspace
button |
|
[delete] |
reset button |
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The "plus" button is
used for adding two
values or for
specifying a
positive exponent in
scientific notation
(note: since the
default exponent is
positive, it does
not need to be
explicitly
specified).
The "minus" button
is used for
subtracting one
value from an other,
for entering a
negative value or
for specifying a
negative exponent in
scientific notation.
For information
about entering a
negative value see
the above section "Negative
numbers".
RESTRICTIONS: None.
Addition on
Wikipedia
Negative numbers on
Wikipedia
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  Multiplication
/ division
The "multiplication"
button is used for
multiplying two
values.
RESTRICTIONS: None.
Multiplication on
Wikipedia
The "division"
button is used for
dividing one value
(dividend) by
another (divisor).
RESTRICTIONS: The
divisor must not
equal zero. A zero
in the divisor will
generate an error
and terminate the
calculation.
Division on
Wikipedia
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The "square root"
button is used for
calculating the
square root of a
value. The square
root of a value is
the number, which
multiplied by
itself, gives the
original value.
RESTRICTIONS: The
value must be
greater than or
equal to zero. A
value smaller than
zero will generate
an error and
terminate the
calculation.
Square root on
Wikipedia
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 Root
(general)
The "root" button is
used for calculating
the root of a value.
Although it is
theoretically
possible to
calculate the root
of a negative value
if the root is an
odd number, this
calculator only
calculates the roots
of values which are
greater than or
equal to zero.
RESTRICTIONS: The
value who's root you
want to calculate
must be greater than
or equal to zero,
except where the
root is a number
between -1 and 1
inclusive, which
corresponds to
raising the vaule to
the reciprocal of
the root. Otherwise
a value smaller than
zero will generate
an error and
terminate the
calculation.
Root on Wikipedia
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The "square" button
is used for
calculating the
square of a value.
The square of a
value is the result
of multiplying a
value by itself.
RESTRICTIONS: None.
Square on Wikipedia
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The "exponent"
button is used for
raising a value
(base) to the power
of another value
(exponent).
RESTRICTIONS: Since
raising a negative
base to a power
between -1 and 1
exclusive
corresponds to the
root reciprocal of
the exponent, and
trying to calculate
a root of a negative
number generates an
error, this
configuration will
generate an error
and terminate your
calculation.
Exponent on
Wikipedia
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The "logarithm"
button is used for
calculating the
logarithm to base 10
of a value. To
calculate the
logarithm of a value
to a base other than
10 divide the
logarithm of the
value by the
logarithm of the
desired base.
RESTRICTIONS: The
value must be
greater than zero. A
value less than or
equal to zero will
generate an error
and terminate your
calculation.
Logarithm on
Wikipedia
Change of base on
Wikipedia
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The "natural
logarithm" button is
used for calculating
the logarithm to
base e of a value.
To calculate the
logarithm of a value
to a base other than
e divide the natural
logarithm of the
value by the natural
logarithm of the
desired base.
RESTRICTIONS: The
value must be
greater than zero. A
value less than or
equal to zero will
generate an error
and terminate your
calculation.
Natural logarithm on
Wikipedia
Change of base on
Wikipedia
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The "e" button is
used for entering
(an approximation
of) the constant e
into the calculator.
e to the power of a
value is the inverse
of the natural
logarithm of the
same value.
RESTRICTIONS: None.
e on Wikipedia
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The "reciprocal"
button is used for
calculating the
reciprocal of a
value. The
reciprocal of a
value is 1 divided
by the value.
RESTRICTIONS: The
value must not equal
zero. A value of
zero will generate
an error and
terminate the
calculation.
Reciprocal on
Wikipedia
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The "sine" button is
used for calculating
the sine of a value.
For now, degrees are
the only unit this
function supports.
It returns a number
between -1 and 1
inclusive.
The "cosine" button
is used for
calculating the
cosine of a value.
For now, degrees are
the only unit this
function supports.
It returns a number
between -1 and 1
inclusive.
To convert
degrees(deg) to
radians(rad) and
back, the following
formulas can be
used:
rad = deg * Pi / 180
deg = rad / Pi * 180
RESTRICTIONS: None.
Trigonometric
function on
Wikipedia
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  Arcine
/ arccosine
The "arcsine" button
is used for
calculating the
arcsine of a value.
Arcsine is the
inverse function of
sine. For now,
degrees are the only
unit this function
supports. It returns
a number between -90
and 90 inclusive.
RESTRICTIONS: The
value must be a
number between -1
and 1 inclusive.
The "arccosine"
button is used for
calculating the
arccosine of a
value. Arccosine is
the inverse function
of cosine. For now,
degrees are the only
unit this function
supports. It returns
a number between -90
and 90 inclusive.
To convert
degrees(deg) to
radians(rad) and
back, the following
formulas can be
used:
rad = deg * Pi / 180
deg = rad / Pi * 180
RESTRICTIONS: The
value must be a
number between -1
and 1 inclusive.
Inverse
trigonometric
function on
Wikipedia
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  Tangent
/ arctangent
The "tangent" button
is used for
calculating the
tangent of a value.
For now, degrees are
the only unit this
function supports.
RESTRICTIONS: None.
Trigonometric
function on
Wikipedia
The "arctangent"
button is used for
calculating the
arctangent of a
value. Arctangent is
the inverse function
of tangent. For now,
degrees are the only
unit this function
supports. It returns
a number between -90
and 90 inclusive.
To convert
degrees(deg) to
radians(rad) and
back, the following
formulas can be
used:
rad = deg * Pi / 180
deg = rad / Pi * 180
RESTRICTIONS: None.
Inverse
trigonometric
function on
Wikipedia
table of contents
The "Pi" button is
used for entering
(an approximation
of) the constant Pi
into the calculator.
Pi is for example
useful in
trigonometric
functions and for
calculating the
circumference, area
and volume of
circular geometrical
objects.
RESTRICTIONS: None.
Pi on Wikipedia
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 Modulo
The "modulo" button
is used for
calculating modulo
of two values.
Modulo is the
remainder of one
value (dividend)
divided by another
(divisor). The way
it is implemented in
this calculator, the
result has always
the same sign as the
dividend.
RESTRICTIONS: The
divisor must not
equal zero. A zero
in the divisor will
generate an error
and terminate the
calculation.
Modulo operation on
Wikipedia
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The "scientific
notation" button is
used for entering
values in scientific
notation. A value
written in
scientific notation
has the form: a x 10b.
It is especially
useful for entering
very large or very
small values. For
example instead of
entering 123000 you
can enter 1.23e+5.
And instead of
entering 0.000123
you can enter
1.23e-4.
To enter a negative
exponent press the
minus (-) button
after pressing the
"scientific
notation" button.
When entering a
positive exponent,
you do not need to
enter the plus (+)
sign, because the
exponent is positive
by default.
RESTRICTIONS: Trying
to place scientific
notation in a point
of an expression,
where it cannot be
placed, will
generate an error
message.
Scientific notation
on Wikipedia
table of contents
The "toggle positive
/ negative" button
is used for
switching the sign
of the last entered
number. The sign of
a bracket cannot be
switched. To make a
bracket negative use
the "minus" button
before opening a
bracket. For more
information about
negative vaules see
the above section "Negative
numbers".
RESTRICTIONS: None.
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The "bracket"
buttons are used for
opening and closing
brackets. Brackets
are useful when the
order of calculation
should diverge from
the standard order
of operations. If
for example in the
expression 5 + 3 / 2
the term 5 + 3
should be evaluated
first and then be
divided by 2, then
you it must be
entered as (5 + 3) /
2.
Once a bracket has
been opened, numbers
will apear beside
the bracket symbols
on the bracket
buttons, which
indicate how many
brackets have been
opened or closed.
The number beside
the "close bracket"
will be red as long
as not all opened
brackets have been
closed. Opened
brackets will be
closed automatically
upon evaluating the
expression using the
"is equal to"
button. Once a
bracket has been
closed the output
will be updated to
reflect the value of
the closed bracket.
The sign of a
bracket cannot be
switched. To make a
bracket negative use
the "minus" button
before opening a
bracket. For more
information about
negative vaules see
the above section "Negative
numbers".
RESTRICTIONS: Trying
to open or close a
bracket at a point
of an expression,
where a bracket
cannot be placed,
will generate an
error message.
Brackets on
Wikipedia
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The "x percent of y"
button is used for
calculating a
percentage of a
value. For example
to calculate 5% of
50 (which is 2.5),
enter
.
The "how many
percent of y is x?"
button is used for
calculating how many
percent one value of
another value
constitutes. For
example to find out
how many percent of
50 the value 5
constitutes (which
is 10%), enter
.
For more information
about percentages
see the above
section "Percentages".
RESTRICTIONS: None.
Percentage on
Wikipedia
table of contents
The "ceiling" button
is used for
obtaining the
ceiling of a value.
The ceiling of a
value is the
smallest integer
(whole number or
negative) not less
than the value. For
example the ceiling
of 4.2 is 5 and the
ceiling of -4.2 is
-4.
RESTRICTIONS: None.
Ceiling on Wikipedia
table of contents
The "floor" button
is used for
obtaining the floor
of a value. The
floor of a value is
the highest integer
(whole number or
negative) less than
or equal to the
value. For example
the floor of 4.2 is
4 and the floor of
-4.2 is -5.
RESTRICTIONS: None.
Floor on Wikipedia
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 Decimal
The "decimal" button
is used for
obtaining the
decimal part of a
value. For example
the decimal of 3.141
is 0.141.
RESTRICTIONS: None.
Decimal on Wikipedia
table of contents
The "factorial"
button is used for
calculating the
factorial of a value
(for integer values)
or for calculating
(an aproximation of)
the gamma function
for the value + 1
for values greater
than or equal to
zero and non-integer
values smaller than
zero. The algorithm
used for this
operation is based
on the "StieltjesLnFactorial"
algorithm by Peter
Luschny.
RESTRICTIONS: The
value must be
greater than or
equal to zero, or
non-integer smaller
than zero. Integer
values smaller than
zero will generate
an error and
terminate the
calculation.
Factorial on
Wikipedia
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