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Convert between Tesla, Gauss, ampere per meter (A/m), and Oersted instantly. Enter a value and see all conversions in real-time.
1 T = 10,000 G
1 G = 0.0001 T
1 T = 795,774.7 A/m
1 A/m = 0.000001257 T
1 T = 10,000 / 0.7958 Oe ≈ 12,566 Oe
1 Oe ≈ 0.0000796 T
In air/vacuum: 1 G ≈ 0.7958 Oe
1 Oe ≈ 1.2566 G
Magnetic field strength (also called magnetic flux density) measures the intensity of a magnetic field at a specific point in space. The Tesla (T) is the SI unit, representing a very strong field - Earth's magnetic field is only about 0.00005 T (50 microtesla). Magnetic fields are created by moving electric charges, permanent magnets, and changing electric fields. Understanding magnetic field strength is crucial for designing electric motors, generators, transformers, magnetic resonance imaging (MRI) machines, particle accelerators, and countless other electromagnetic devices. Different units evolved from different measurement systems and applications, with Tesla and A/m being SI units, while Gauss and Oersted come from the older CGS system.
Converting between magnetic field units requires understanding both the measurement system differences (SI vs CGS) and the physical quantities being measured. Tesla and Gauss measure magnetic flux density (B-field), while A/m and Oersted measure magnetic field intensity (H-field), though in vacuum they're proportionally related.
Example: Convert 500 Gauss to Tesla
500 G × 0.0001 = 0.05 T (or 50 mT)
Medical MRI systems operate at precise magnetic field strengths measured in Tesla (typically 1.5 T or 3 T). Engineers must convert between units when calibrating equipment and ensuring patient safety.
Motor engineers specify air gap flux density in Gauss or Tesla to optimize torque production, efficiency, and thermal performance across various motor types and applications.
Manufacturers measure residual magnetic flux density (remanence) in Gauss or Tesla, and coercivity in Oersted or A/m to specify magnet performance for industrial applications.
EMC engineers measure stray magnetic fields in Gauss or microtesla to ensure electronic devices meet regulatory emission standards and won't interfere with nearby equipment.
Researchers use Tesla for high-field experiments in superconductivity, particle physics, and materials science, while geophysicists often use nanotesla for measuring Earth's subtle magnetic variations.
B-field (magnetic flux density, measured in Tesla or Gauss) is the total magnetic field including material effects. H-field (magnetic field intensity, measured in A/m or Oersted) represents the external magnetic field. In vacuum, B = µ₀H where µ₀ is the permeability of free space.
While Tesla is the SI standard, many industries (especially in the US) continue using CGS units like Gauss because they provide convenient numerical values for common applications. A typical permanent magnet is 1000-13000 Gauss rather than 0.1-1.3 Tesla.
Earth's surface magnetic field is approximately 50 microtesla (0.00005 T), 0.5 Gauss, or 40 A/m. It varies by location, being stronger near the magnetic poles and weaker near the equator.
Static magnetic fields below 2 Tesla are generally considered safe for the general public, though people with pacemakers or metal implants should avoid strong fields. MRI machines safely use 1.5-3 T fields, with research systems reaching 7 T or higher under controlled conditions.
Yes! Gaussmeters and teslameters measure the same quantity (magnetic flux density). Simply convert the reading: divide Gauss by 10,000 to get Tesla, or multiply Tesla by 10,000 to get Gauss.
Use Tesla for scientific work, medical applications, and international standards. Use Gauss for permanent magnets, small motors, and US-based manufacturing. Use A/m when calculating magnetic circuits and material properties. Your measurement equipment will typically indicate its preferred unit.