Skip to main content
Unit Converter
electricity Group•4 Units• Free Online Precision Tool

Magnetic Field Strength Converter

Convert magnetic field intensity and magnetic flux density across Tesla (T), Gauss (G), Oersted (Oe), and Ampere per meter (A/m) with real-time bidirectional calculations.

Explore Magnetic Field Strength Guide & Formulas↓View Magnetic Field Strength Converter Chart→
Formula

Simultaneous Category Equivalents

Click any unit card to set it as the active primary input

Zero-latency client-side engine
Copied to clipboard

Popular Magnetic Field Strength Conversion Shortcuts

Instant pair conversions with verified scientific and mathematical formulas

Quick Pairs
Tesla to Gauss→
1 Tesla = 10,000 Gauss
Gauss to Tesla→
10,000 Gauss = 1 Tesla
Tesla to A/m→
1 Tesla ≈ 795,775 A/m (vacuum)
A/m to Tesla→
1,000 A/m ≈ 0.001257 Tesla
Gauss to Oersted→
1 Gauss = 1 Oersted (in vacuum)
Oersted to Gauss→
1 Oersted = 1 Gauss (in vacuum)
Tesla to Oersted→
1 Tesla = 10,000 Oersted
Gauss to A/m→
1 Gauss ≈ 79.5775 A/m

Magnetic Field Strength Reference Equivalents (1 Tesla)

Standard ratios measured against the base Tesla (T)

Reference Table
Unit NameSymbolEquivalent in 1 TQuick Pair Page
TeslaT1 T = 1 TBase Unit
GaussG1 T = 10,000 GT to G →
Ampere per meterA/m1 T = 795,774.715459 A/mT to A/m →
OerstedOe1 T = 10,000 OeT to Oe →

Magnetic Flux Density & Field Strength Reference Chart

Lookup table of magnetic fields in nature and technology, from human brain biomagnetism to astrophysical magnetars

Lookup Matrix
Magnetic Source / EnvironmentTesla (T) (SI)Gauss (G) (CGS)Ampere/meter (A/m)Oersted (Oe)
Human Brain Magnetoencephalography (MEG)10⁻¹³ T0.000000001 G0.00000008 A/m0.000000001 Oe
Interstellar Galactic Magnetic Field10⁻¹⁰ T0.000001 G0.00008 A/m0.000001 Oe
Earth's Geomagnetic Surface Field (Equator)0.000031 T0.31 G24.7 A/m0.31 Oe
Earth's Geomagnetic Surface Field (Poles)0.000060 T0.60 G47.7 A/m0.60 Oe
Standard Refrigerator Decorative Magnet0.0050 T50.0 G3,979 A/m50.0 Oe
Solar Sunspot Magnetic Field Core0.30 T3,000.0 G238,732 A/m3,000.0 Oe
Strong Neodymium (NdFeB N52) Rare Earth Magnet1.45 T14,500.0 G1,153,873 A/m14,500.0 Oe
Clinical Medical MRI Scanner (Hospital Standard)1.50 T15,000.0 G1,193,662 A/m15,000.0 Oe
High-Field Research MRI Scanner (Ultra-High Resolution)7.00 T70,000.0 G5,570,423 A/m70,000.0 Oe
CERN Large Hadron Collider (LHC) Dipoles8.30 T83,000.0 G6,604,929 A/m83,000.0 Oe
Strongest Sustained Lab Field (Florida MagLab)45.0 T450,000.0 G35,809,862 A/m450,000.0 Oe
Surface of a Cosmic Magnetar (Neutron Star)10¹¹ T10¹⁵ G7.95 × 10¹⁶ A/m10¹⁵ Oe
Electromagnetism & Quantum Physics

Magnetic Field: Flux Density, Permeability & Lorentz Force Equations

Authoritative guide to magnetic flux density (B), magnetizing intensity (H), Maxwell's equations, and SI unit conversions across MRI and industrial electromagnetics.

Lorentz Force & Magnetic Flux Density (B)

Magnetic flux density B is defined through the magnetic component of the Lorentz Force Law acting on a moving charged particle:

F = q · (E + v × B) ⟹ |F_B| = q · v · B · sin(θ)

Lorentz Force Equation (F = Force in Newtons, q = Charge, v = Velocity, B = Magnetic Flux Density in Tesla)

One Tesla represents the magnetic flux density that exerts a force of 1 Newton on a charge of 1 Coulomb moving perpendicular to the magnetic field at a velocity of 1 meter per second.

SI Tesla vs. CGS Gauss & Oersted Standards

Magnetics engineering historically developed under the Gaussian CGS system:

SI Standard: Tesla (T) & A/m

1 Tesla equals 1 Weber / m² = 1 N / (A·m). Magnetic field strength H is expressed in Amperes per meter (A/m), directly reflecting the electric current driving an electromagnetic coil.

CGS Standard: Gauss (G) & Oersted (Oe)

1 Tesla = 10,000 Gauss. In free space (vacuum), where relative permeability is unity, an applied field of 1 Oersted produces exactly 1 Gauss of flux density.

Superconducting Solenoids & MRI Safety

Clinical magnetic resonance imaging (MRI) instruments utilize niobium-titanium (NbTi) superconducting coils cooled to 4 Kelvin by liquid helium to generate continuous fields of 1.5T to 3.0T without resistive electrical dissipation. Strict safety perimeters (the 5-Gauss line) prevent ferromagnetic projectile accidents.

About Magnetic Field Strength Units & Formulas

1 Tesla = 10,000 Gauss | 1 A/m = 4π × 10⁻⁷ T (in vacuum).

TeslaT

SI unit of magnetic flux density

GaussG

CGS unit (1 G = 10⁻⁴ T)

Ampere per meterA/m

SI unit of magnetic field strength H

OerstedOe

CGS unit of magnetic field strength

FREQUENTLY ASKED QUESTIONS

Magnetic Field Strength Converter FAQs

Frequently asked questions regarding magnetic field strength conversion metrics, formulas, and real-world calculation standards

How do you convert Tesla to Gauss?

To convert Tesla (T) to Gauss (G), multiply by 10,000: Gauss = Tesla × 10,000.

Examples:

  • A standard 1.5 Tesla hospital MRI scanner has a magnetic field strength of: 1.5 × 10,000 = 15,000 Gauss.
  • A neodymium magnet rated at 0.5 T: 0.5 × 10,000 = 5,000 Gauss.
  • Reverse Conversion: Divide Gauss by 10,000 to get Tesla (e.g., Earth's field of 0.5 Gauss ÷ 10,000 = 0.00005 Tesla = 50 μT).

What is magnetic flux density (B) vs magnetic field strength (H)?

In physics, two vector quantities describe magnetic fields:

  • Magnetic Flux Density (B): The total magnetic field in a medium, including the contribution of induced magnetic dipoles in matter. Measured in Tesla (T) or Gauss (G). 1 T = 1 Wb/m² = 1 N/(A·m).
  • Magnetic Field Strength (H): The external magnetizing field produced strictly by macroscopic electrical currents, independent of the material's response. Measured in Ampere per meter (A/m) or Oersted (Oe).
  • Constitutive Equation: B = μ · H = μ_r · μ_0 · H, where μ_0 is vacuum permeability (4π × 10⁻⁷ T·m/A) and μ_r is the relative magnetic permeability.

What is Earth's magnetic field strength?

Earth's geomagnetic field at the surface ranges from approximately 25 to 65 microteslas (μT), which equals 0.25 to 0.65 Gauss.

It is weakest near the magnetic equator (~30 μT or 0.3 Gauss) and strongest near the magnetic poles (~60 μT or 0.6 Gauss). While weak compared to a refrigerator magnet (50 Gauss), it extends thousands of kilometers into space to form the magnetosphere, deflecting ionizing solar wind particles.

Why are rare-earth Neodymium magnets so strong?

Neodymium-Iron-Boron magnets (Nd₂Fe₁₄B) possess an exceptionally high saturation magnetization and enormous uniaxial magnetocrystalline anisotropy. The tetragonal crystal structure locks magnetic electron spin dipoles firmly along a single crystal axis, preventing demagnetization and producing surface flux densities of 1.2 to 1.48 Tesla (12,000 to 14,800 Gauss).