# JEOL MS Calculator — Isotopes and Compositions

> Mass spectrometry calculator for isotopes, compositions, and m/z values. (iPhone/iPad app by JEOL USA Inc.)

- Source: https://appshunter.io/ios/app/jeol-ms-calculator/id1474273743 (this page in markdown: same URL + `.md`)
- Developer: [JEOL USA Inc](https://appshunter.io/developer/1459184461)
- Category: Education, Reference
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 12.2 · 6 MB
- Released: 2020-03-24
- Data updated: 2026-07-01
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/jeol-ms-calculator/id1474273743/reviews.md

## What is JEOL MS Calculator?

Use the JEOL mass spectrometry calculator to calculate stable isotope distributions for a given elemental composition, calculate the possible elemental compositions for an accurate mass.  You can also calculate m/z values for multiple charge ions from a molecular weight or molecular weight from two successive charge states. Please see the support page for instructions.

## Key features

- Calculate stable isotope distributions
- Calculate elemental compositions
- Calculate m/z values for ions
- Calculate molecular weight from charge states
- Support page for instructions


## Frequently asked questions about JEOL MS Calculator

### What is JEOL MS Calculator used for?

JEOL MS Calculator is used to calculate stable isotope distributions for elemental compositions, determine possible elemental compositions from accurate mass, and calculate m/z values for ions or molecular weights from charge states.

### Is JEOL MS Calculator free to use?

Yes, JEOL MS Calculator is available for free on the App Store. It does not have any associated costs for download or use.

### What devices does JEOL MS Calculator support?

JEOL MS Calculator is compatible with iPhone, iPad, and iPod touch devices, running on iOS.

### How often is JEOL MS Calculator updated?

The latest version of JEOL MS Calculator is 1.14, which was last updated on May 24, 2022. Updates typically occur to improve functionality or compatibility.

### What is the age rating for JEOL MS Calculator?

JEOL MS Calculator has an age rating of 4+, making it suitable for a wide range of users, including younger students.

### Where can I find instructions for JEOL MS Calculator?

Instructions and guidance for using JEOL MS Calculator can be found on its dedicated support page, accessible through the app.

### Does JEOL MS Calculator offer certifications?

JEOL MS Calculator is a tool for calculations and data analysis in mass spectrometry; it does not offer certifications upon completion of any tasks.

### What is the user sentiment for JEOL MS Calculator based on ratings?

JEOL MS Calculator has a perfect rating of 5.0 stars from one review, indicating a highly positive user experience from that individual.

## Version history (last 3 releases)

### 1.14 — 2022-05-24

Displayed in Light Mode regardless of system display setting. This circumvents a problem where the instrument selector and NMR frequency selector are not displayed correctly in Dark Mode.

### 1.12 — 2022-05-17

Recompiled with latest XCODE.  Minor change to help file.

### 1.1 — 2020-03-24

No release notes.

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## More apps by JEOL USA Inc

- [JEOL USA Periodic Table](https://appshunter.io/ios/app/jeol-usa-periodic-table/id1459184462)

All apps by JEOL USA Inc: https://appshunter.io/developer/1459184461

## Related topics

[isotopes](https://appshunter.io/ios/topics/isotopes)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-01.*