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Isotope Pattern Calculator v4.0

----- For naturally occurring isotopes version -----

Developed by Junhua Yan 2001.9

Please type molecular formula (case sensitive):

[See help in detail] [If this software not work, please visit or]
Some sample of syntax for molecular formula:
1. CuSO4.5H2O; CH3(CH2)9COOH; PhOH; AcOEt ( The elements supported#; The Symbols of Groups supported#. Add your Groups! )
2. Gly-Ile-Ala-Thr-Asp; GlyIleAlaThrAsp----   (The symbols of Amino Acid supported)
3. [13C]6H5OH; C6H5[13C]6H4[19F]    ( [13C] presents 13C(isotope); [19F] presents 19F(isotope); It just supports naturally occurring isotopes. If you want to calculate all possible isotopes(for the riched isotopes), please click here.)
Low Resolution                  High Resolution
Show peaks from mass value to . (Optional)
Some mass peaks which relative abundances are
Set decimal places for the exact  mass in the data table = *
Set tags for all  peaks  = *
Set offset of the up-down position of  tags  = 

* (Increase this value, the tags will move down; Decrease this value,  the tags will move up.)  

Set offset of the left-right position of  tags  = 

* (Increase this value, the tags will move right; Decrease this value,  the tags will move left.)  

*: The items are just for high resolution.
1. if you want to calculate molecular weight online, please click here.
2. Molecular weight Calculator for Windows 9X, Windows Me, Windows NT, Windows 2000 and Windows XP, click here to download it.
3. You have print problem?  Please click here for help.
4. Have the problem of sorting Chemical Inventory with FileMaker or FileMaker Pro? Please click here.
#:  Oscar van Vlijmen from Netherlands gave me much help for correcting atom mass data and provided lots of groups. I greatly appreciate what he did for this software.

If you have any questions or suggestions, please contact me. My email address is
This software is not free software, don't copy it to anyone else without my permission

If this software not work, please visit or

2001.8 - 2001.9 All rights reserved