☢️ Convert Radiation Units Instantly
Convert between Absorbed Dose (Gy, rad), Exposure (C/kg, Roentgen), and Activity (Bq, Ci) with precision. Ideal for students, health physicists, and engineers.
Radiation Converter Inputs
Your Conversion Results
Physics Insight
Enter a value and click Convert to see the result and learn about the physics.
Conversion Visual
Relative Magnitude
What-If Simulator
Adjust the input value to see how the conversion changes.
How This Tool Works
Choose a category — Select Absorbed Dose, Exposure, or Activity.
Enter a value and units — Input the number and select the 'from' and 'to' units.
Click Convert — The tool instantly calculates and displays the result.
Explore further — Use the slider to test different values or copy/share your result.
Converted = Input × (Factor_from / Factor_to) 💡 Each unit has a conversion factor to the SI base unit. 📊 The tool uses precise factors from NIST.
The Physics Behind the Tool
1 Gy = 1 J/kg
1 rad = 0.01 Gy = 0.01 J/kg
1 C/kg = 3876 R (approx.)
1 R = 2.58 × 10⁻⁴ C/kg
1 Bq = 1 s⁻¹
1 Ci = 3.7 × 10¹⁰ Bq
Radiation units are critical in health physics, nuclear medicine, and environmental monitoring. Accurate conversion ensures proper dosimetry and safety assessments.
Real-World Examples
Medical X-ray
Typical dose: 0.1 mGy = 10 mrad
Conversion: 0.1 mGy = 10 mrad
Background Radiation
Typical exposure: 0.1 µC/kg = 0.387 R
Conversion: 0.1 µC/kg ≈ 0.387 R
Medical Isotope
Activity: 100 mCi = 3.7 GBq
Conversion: 100 mCi = 3.7 GBq
Conversion Factor Comparison
Key conversion factors used in the tool.
| Category | From Unit | To Unit | Factor |
|---|---|---|---|
| Dose | 1 Gy | rad | 100 |
| Dose | 1 rad | Gy | 0.01 |
| Exposure | 1 R | C/kg | 2.58×10⁻⁴ |
| Exposure | 1 C/kg | R | 3876 |
| Activity | 1 Ci | Bq | 3.7×10¹⁰ |
| Activity | 1 Bq | Ci | 2.7027×10⁻¹¹ |
What Makes This Tool Different
Three-in-one — Combines Dose, Exposure, and Activity converters in one tool.
Wide unit support — Covers SI and traditional units including rad, rem, roentgen, curie, and more.
Educational insights — Each conversion includes physics context and real-world relevance.
Interactive slider — Dynamically test different values to see how the conversion changes.
No tracking, no sign-up — All calculations run locally in your browser.
Common Mistakes to Avoid
Limitations
Trust & Privacy
All calculations are performed locally in your browser. No personal information is stored or shared.
Browser Compatibility
References & Standards
Editorial Process
The CalculatorKits editorial team reviews this tool periodically to ensure formula accuracy, clear definitions, helpful explanations, and current information. Last reviewed: July 2026.
Frequently Asked Questions
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Who Uses This Tool?
Students
Learning about radiation units and practicing conversions for physics and health physics classes.
Health Physicists
Quickly converting dose, exposure, and activity units for safety assessments and reports.
Researchers
Converting radiation measurements across different unit systems in experimental data.
Engineers
Working with radiation sources in industrial and medical applications.