# NMR Calculator

> Calculates NMR spectroscopy parameters for nuclei, signals, RF pulses, and solutions. (iPhone/iPad app by Jae-Seung Lee.)

- Source: https://appshunter.io/ios/app/nmr-calculator/id1146296877 (this page in markdown: same URL + `.md`)
- Developer: [Jae-Seung Lee](https://appshunter.io/developer/1146296876)
- Category: Education, Reference
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 10.0 · 22 MB
- Languages: English
- Released: 2016-09-10
- Data updated: 2026-06-24
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/nmr-calculator/id1146296877/reviews.md

## What is NMR Calculator?

The app evaluates the values of some basic parameters used in nuclear magnetic resonance (NMR) spectroscopy.

Nucleus
- Select an isotope with non-zero nuclear spin to find out its nuclear spin, gyromagnetic ratio, and natural abundance.
- For a chosen isotope, its Larmor frequency at a specified external magnetic field together with the Larmor frequencies of the proton and free electron will be shown.
- One can change any of the Larmor frequency, external magnetic field, and proton’s Larmor frequency to find out the other two.
- The information on the chosen isotope can be searched in Safari by pressing the "Search Web" button.

Signal
- One of the number of data points, duration, and dwell time for signal acquisition is calculated when two of them are given.
- One of the number of data points, spectral width, and frequency resolution for a NMR spectrum is calculated when two of them are given.
- One of the items can be deactivated by tabbing the corresponding label. While deactivated, the value will not be changed, and the calculation will be performed accordingly.

RF Pulse
- One of the pulse duration, flip angle, and RF amplitude of a RF pulse is calculated when two of them are given.
- The difference between the power levels of two RF pulses is presented in dB.
- One of the repetition time, relaxation time, and Ernst angle is calculated when the other two are given.
- One of the items, except "RF power relative to 1st (dB)", can be deactivated by tabbing the corresponding label. While deactivated, the value will not be changed, and the calculation will be performed accordingly.

Solution
- The concentration of a sample solution is calculated when the molecular weight and the masses of the solute and solvent water are given.
- The amount of the solute is calculated when the concentration is given.
- The name of chemical can be entered.

Info
- The data source for NMR-enabled isotopes and formulas used in the app are presented.

## Key features

- Isotope parameter calculation
- Larmor frequency computation
- Signal acquisition calculation
- RF pulse parameter determination
- Solution concentration calculation
- Web search integration


## Frequently asked questions about NMR Calculator

### What can NMR Calculator calculate for isotopes?

NMR Calculator can determine the nuclear spin, gyromagnetic ratio, and natural abundance for selected isotopes. It also calculates the Larmor frequency for a chosen isotope at a specified external magnetic field.

### How does NMR Calculator help with signal acquisition?

For signal acquisition, NMR Calculator can compute the number of data points, duration, or dwell time when two of these are provided. It also assists in calculating spectral width and frequency resolution for NMR spectra.

### What RF pulse parameters can NMR Calculator handle?

NMR Calculator can calculate pulse duration, flip angle, or RF amplitude when two of these are known. It also determines the difference in power levels between two RF pulses in dB and calculates repetition time, relaxation time, or the Ernst angle.

### Can NMR Calculator determine solution concentrations?

Yes, NMR Calculator can calculate the concentration of a sample solution when the molecular weight and masses of the solute and solvent water are provided. It can also calculate the amount of solute when the concentration is given.

### What devices is NMR Calculator available on?

NMR Calculator is available on iPhone, iPad, iPod, and Mac devices. It is also supported on Apple Watch.

### When was NMR Calculator last updated?

The latest version of NMR Calculator, 1.3.2, was last updated on February 10, 2020.

### What is the age rating for NMR Calculator?

NMR Calculator has an age rating of 4+, making it suitable for a wide range of users.

### Where does NMR Calculator get its data from?

The data source for NMR-enabled isotopes and formulas used in NMR Calculator is presented within the app's 'Info' section.

## Version history (last 1 release)

### 1.3.2 — 2020-02-10

Added WatchOS extension.
- Search for an isotope with non-zero nuclear spin on your wrist!
- Select an isotope and find out its Larmor frequency for a given external magnetic field or proton Armor frequency by using the Digital Crown.

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All apps by Jae-Seung Lee: https://appshunter.io/developer/1146296876

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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 2026-06-24.*