molbiotools

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Molbiotools is a collection of free online apps:

DNA Sequence Tools
Text and Data Tools
Calculators

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Chemical Calculator

Enter molar mass: g/mol

(equivalent to molecular weight - M. W. or formula weight - F. W.)

In the following boxes, always fill all but one field and click 'Calculate'. Don't use commas to separate thousands.

Clear
Calculate

Molarity, mass and volume

Concentration (molarity):

Mass:

Volume:

Clear
Calculate

Percentage and molarity

Percent concentration (percentage): %

Molar concentration (molarity):

Clear
Calculate

Dilution of a stock solution

Stock solution concentration:

Final volume:

Final concentration:

Volume of stock solution:

Clear
Calculate

Dilution to a desired concentration

Initial concentration:

Initial volume:

Final concentration:

Volume of solvent to add:

Clear
Calculate

Absorbance of a solution

Absorbance:

Optical path: cm

Molar extinction coefficient: lmol-1cm-1

Concentration:

Tool Description

You can use Chemical Calculator to:

  • Calculate the mass or volume required to prepare a chemical solution that contains a specified molar concentration of a substance. Conversely, you can calculate the molarity of a solution prepared by dissolving a certain amount of a substance in a specified volume of a solvent.
  • Convert percent concentration (w/v or v/v) into molar concentration and vice versa.
  • Calculate dilution of a stock solution to reach the required working concentration. The calculator can convert between mass concentration and molar concentration.
  • Calculate volume adjustment to reach a desired final concentration.
  • Calculate a substance solution concentration from its absorbance and vice versa.

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Molarity, mass and volume

Definitions and explanations

The app can use a3132132132112345565989879846 tabular dataset or individual data lists as the input. In the first case, click the "Tabular Input" heading and provide the data. In the latter case, the required number of empty list forms has to be prepared up front. This can be done by filling the number of lists to be prepared in the "Number of lists" field followed by clicking the "Set" button (all existing lists will be discarded). To add a list form to an existing set of forms, click the large plus button located just after the last list form.

To apply any changes made in the settings or in input data, click the "Compare" button.

Calculations

To apply any changes made in the settings or in input data, click the "Compare" button.

Close

Percentage and molarity

Definitions and explanations

The app expects an input in the form of simple item lists i.e. with one item per line. If the source data are to be loaded from files, the files should be plain text files (no formatting) containing one item per each line or comma-separated items.

Calculations

To apply any changes made in the settings or in input data, click the "Compare" button.

Close

Dilution of a stock solution to a working concentration

Definitions and explanations

The app can import a tabular dataset wherein the list items are organized column-wise and separated with delimiters in each row. The delimiter can be one of the characters tab, comma or semicolon and has to be properly chosen before reading the data into the app with the "Read Data" button. You can directly copy - paste data from Microsoft Excel or other spreadsheet programs. Choose tab as the delimiter in such cases. If the source data are to be loaded from a file, the file should be a plain text file containing delimiter-separated values. After clicking the "Read Data" button, the values should get properly distributed into individual input lists. If not, check the delimiter choice and appearance of the data. The problem may also be caused by a presence of additional text lines preceding the data. Such lines have to be removed manually.

Calculations

To apply any changes made in the settings or in input data, click the "Compare" button.

Close

Dilution to a desired concentration

Definitions and explanations

The app expects an input in the form of simple item lists i.e. with one item per line. If the source data are to be loaded from files, the files should be plain text files (no formatting) containing one item per each line or comma-separated items.

Calculations

To apply any changes made in the settings or in input data, click the "Compare" button.

Close

Absorbance of a solution

Definitions and explanations

The app can import a tabular dataset wherein the list items are organized column-wise and separated with delimiters in each row. The delimiter can be one of the characters tab, comma or semicolon and has to be properly chosen before reading the data into the app with the "Read Data" button. You can directly copy - paste data from Microsoft Excel or other spreadsheet programs. Choose tab as the delimiter in such cases. If the source data are to be loaded from a file, the file should be a plain text file containing delimiter-separated values. After clicking the "Read Data" button, the values should get properly distributed into individual input lists. If not, check the delimiter choice and appearance of the data. The problem may also be caused by a presence of additional text lines preceding the data. Such lines have to be removed manually.

Calculations

To apply any changes made in the settings or in input data, click the "Compare" button.

Close