Click the following link to access the calculator, or highlight and paste in your Internet browser. The instructions follow.

http://www.ktf-split.hr/periodni/en/calc4chem.html

Scientific calculator for chemists with notebook

Scientific calculator for chemists with notebook is a fully functioning JavaScript calculator. This calculator can be used as common scientific calculator (sin, cos, log, power, root, memory), but it also includes a molecular weight calculator and the tables with various physical and chemical constants. The calculator contains a list with task history, storing all the recent inputs and results. Scientific calculator displays the numbers rounded to a user-specified number of decimal places.

Entering expression

Type your expression directly onto the input line or copy and paste an expression from another programs. When you finish entering your expression, press ENTER or click [=] button.

Rules for typing expression

Angle measure

In trigonometric calculations, angles are interpreted as radians (default) or degrees, depending on mode setting (Deg or Rad mode).

Number formats

Results can be rounded to a user-specified number of decimal places (max 15-digit). This calculator can round mantissa under scientific notation, also. For example, numbers rounded to a 4 digit like this: decimal number 3.5269, integer number 35269.0000 and scientific number 3.5269 e-31.

Arithmetic operators

To perform basic mathematical operations use the following arithmetic operators: addition (+), subtraction / minus sign (-), multiplication (*) and division (/)

Positive numbers

Enter a positive number by pressing the appropriate digit keys (or buttons) and, if necessary, the decimal point key [.]. Period and comas are equivalents as decimal separator in numbers (3,2 + 4.3 = 7.5).

Negative numbers

Negative numbers are obtained by simple putting the minus sign (-) before the number.

Scientific notation

Use standard calculator notation for scientific notation, for example 1e-5 is 0.00001; 1e+3 or 1e3 is 1000. Enter the mantissa as the positive or negative number, and then click [E] button or just type lower e and type exponent as the positive or negative number.

Parentheses

Operations with the same precedence are performed from left to right, with operations enclosed in parentheses performed first. If parentheses are nested, the operations enclosed in the innermost set of parentheses are performed first. All types of parentheses are correct, for example 25.3/(K3[Fe(CN)6]).

Chemical formulae

Physical constants

Clicking the Constants button expand of Scientific calculator for chemists you get access physical constants table. Click the button near constant that you want to insert into expression.

Examples:

2+5-3.25 = 3.75
+5 = 8.75
8+7+(42-16)*3 = 93
8+7+[(42-16)-7]*3 = 72
5*-7 = -35
7e-6/3e-9 = 2333.3333333333
H2SO4 = H*2+S+O*4 = 1.00794*2+32.066+15.9994*4 = 98.079