Magnetic Field Converter

Our Magnetic Field Converter is a comprehensive tool that helps you convert between different units of magnetic field strength: tesla (T), gauss (G), and oersted (Oe). Whether you’re working on physics research, electromagnetic applications, or magnetic materials studies, this calculator makes magnetic field conversion simple and accurate.

Understanding Magnetic Field Units

SI Unit

Tesla (T)

The tesla is the SI unit of magnetic flux density (B). One tesla is defined as the magnetic flux density that produces a force of one newton on a one-coulomb charge moving perpendicular to the field with a velocity of one meter per second.

CGS Units

Gauss (G)

The gauss is the CGS unit of magnetic flux density. One gauss equals 10⁻⁴ tesla. It was the standard unit before the adoption of the SI system and is still commonly used in some fields.

Oersted (Oe)

The oersted is the CGS unit of magnetic field strength (H). In vacuum, one oersted produces a magnetic induction of one gauss. However, in materials, the relationship depends on magnetic permeability.

Conversion Formulas

Here are the key conversion formulas between different magnetic field units:

Tesla to Other Units

• 1 tesla = 10,000 gauss
• 1 tesla = 10,000 oersted (in vacuum)

Gauss to Other Units

• 1 gauss = 0.0001 tesla
• 1 gauss = 1 oersted (in vacuum)

Oersted to Other Units

• 1 oersted = 0.0001 tesla (in vacuum)
• 1 oersted = 1 gauss (in vacuum)

Common Magnetic Field References

Here are some common magnetic field strength measurements:

• Earth’s magnetic field: ~25-65 µT (0.25-0.65 G)
• Refrigerator magnet: ~5 mT (50 G)
• MRI scanner: 1.5-3 T (15,000-30,000 G)
• Strongest continuous magnetic field: 45 T (450,000 G)
• Neutron star surface: ~10⁸-10¹¹ T
• Small bar magnet: ~0.01 T (100 G)

How to Use the Calculator

1. Enter a value in any of the input fields
2. The calculator will automatically convert and display the equivalent values in other units
3. Use the Reset button to clear all fields and start a new conversion
4. Hover over the input fields for helpful tooltips

Applications

Magnetic field conversion is essential in many fields:

• Physics Research: Studying magnetic phenomena
• Medical Imaging: MRI machine specifications
• Materials Science: Analyzing magnetic materials
• Electronics: Designing electromagnetic devices
• Geophysics: Measuring Earth’s magnetic field
• Space Science: Studying stellar magnetism

Tips for Accurate Conversion

1. Always double-check critical measurements
2. Use decimal points for precise measurements
3. Consider rounding to appropriate precision for your application
4. Be aware of significant figures in your measurements

Technical Notes

This calculator provides conversions accurate to six decimal places, which is sufficient for most practical purposes. For extremely precise measurements or scientific applications, please use specialized measuring equipment and conversion tools.

Important considerations for magnetic field measurements:

• Distinction between B-field (flux density) and H-field (field strength)
• Material permeability effects
• Field direction and uniformity
• Measurement conditions
• Temperature effects

Note that these conversions assume:

1. Measurements in vacuum or air (µr ≈ 1)
2. Uniform field conditions
3. Standard temperature and pressure
4. Linear magnetic response
5. Absence of significant electromagnetic interference