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About
The app shows a list of isotopes with non-zero nuclear spin angular momentum. Select an isotope to view its NMR properties and calculate fundamental NMR parameters.
Information section
For a chosen isotope, this section displays the atomic symbol with mass number, nuclear spin angular momentum, gyromagnetic ratio, and natural abundance.
Calculator section
Update any one parameter in a subsection to recalculate the others.
- Larmor frequencies: External magnetic field and the corresponding Larmor frequencies for the chosen isotope, the proton, and the free electron.
- Time domain: Number of data points, acquisition duration, and dwell time.
- Frequency domain: Number of data points, spectral width, and frequency resolution.
- Pulse 1: Pulse duration, flip angle, and RF amplitude in Hz and μT.
- Pulse 2: Pulse duration, flip angle, RF amplitude in Hz, and RF power relative to Pulse 1.
- Ernst angle: Ernst angle and repetition time for a given T₁ relaxation time.
NMR Assistant
An on-device AI assistant scoped to NMR topics, available where Apple Intelligence is supported. Ask questions in plain language — the assistant answers using the same calculation engine that powers the calculator, so results are always physically consistent.
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What's New in NMR Calculator 2
2.0
June 24, 2026
Introducing NMR Assistant — ask questions about NMR parameters in plain language and get calculated answers instantly. - The assistant is powered by on-device AI (available where Apple Intelligence is supported) and uses the same calculation engine as the built-in calculator, so all numerical results are physically consistent. - You can ask things like "What is the Larmor frequency of ¹³C at 9.4 T?" or "What Ernst angle should I use with a T₁ of 2 seconds and a repetition time of 500 ms?" — and the assistant will compute the answer directly, not just describe how to do it. - The assistant is scoped strictly to NMR topics, so it stays focused and on point.
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