Welcome to NMCalc!

Free calculators and learning tools for nuclear professionals. Our 23 tools cover Nuclear Medicine, Radiation Safety, Radiopharmacy, and Research workflows — making complex calculations simple and accessible.

New Free game Phone & desktop

Atomic Odyssey — learn radiation physics by playing

Steer a radioactive particle through a field of atoms that pull on it and drain its energy, just like real matter. See how decay type, energy and atomic number decide how far radiation travels — using real radionuclides from Am-241 to Tc-99m.

  • α Alpha
  • β⁻ Beta-minus
  • β⁺ Positron
  • γ Gamma
▶ Play Atomic Odyssey All NMCalc Games →

Quiz to revive your particle, badges to collect, sign-in optional.

Testing & Development
MPI Reporting AssistantTesting

Score myocardial perfusion SPECT on the 17-segment model and generate a structured report with summed scores, defect descriptions and gated SPECT values.

Smartphone Radiation DetectorBeta
  • Camera-based ionizing radiation detector

Turn your mobile device into a portable survey meter using camera-based particle detection.

Physics & Dosimetry
Decay Calculations4 tools
Exposure & Shielding5 tools
Radiopharmacy Tools5 tools
Clinical Tools
Endocrine System2 tools
Genitourinary System1 tool
Cardiovascular System1 tool
GastroIntestinal SystemComing soon

Tools in development…

QC & Other Tools
QC of NM Instruments2 tools
General Utilities2 tools
🌍 Global Visitor Map
Live
Loading map…
—Active Users (Last 30 Days)
—Countries

    Empowering Nuclear Professionals Worldwide · NMCalc Games · NMCalc © 2026