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This page lists examples of magnetic induction B in teslas and gauss produced by various sources, grouped by orders of magnitude.

The magnetic flux density does not measure how strong a magnetic field is, but only how strong the magnetic flux is in a given point or at a given distance (usually right above the magnet's surface). For the intrinsic order of magnitude of magnetic fields, see: Orders of magnitude (magnetic moment).

Note:

Traditionally, the magnetizing field, H, is measured in amperes per meter.
Magnetic induction B (also known as magnetic flux density) has the SI unit tesla [T or Wb/m²].^[1]
One tesla is equal to 10⁴ gauss.
Magnetic field drops off as the inverse cube of the distance $(.mw-parser-output .sfrac{white-space:nowrap}.mw-parser-output .sfrac.tion,.mw-parser-output .sfrac .tion{display:inline-block;vertical-align:-0.5em;font-size:85%;text-align:center}.mw-parser-output .sfrac .num{display:block;line-height:1em;margin:0.0em 0.1em;border-bottom:1px solid}.mw-parser-output .sfrac .den{display:block;line-height:1em;margin:0.1em 0.1em}.mw-parser-output .sr-only{border:0;clip:rect(0,0,0,0);clip-path:polygon(0px 0px,0px 0px,0px 0px);height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute;width:1px}⁠1/distance3⁠)$ from a dipole source.
Energy required to produce laboratory magnetic fields increases with the square of magnetic field.^[2]

Examples

These examples attempt to make the measuring point clear, usually the surface of the item mentioned.

**Magnetic field strength (from lower to higher orders of magnitude)**
Factor (tesla)	SI name	SI Value	CGS Value	Example of magnetic field strength
10⁻¹⁸ T	attotesla	1 aT	10 fG
10⁻¹⁸ T		5 aT	50 fG	Sensitivity of Gravity Probe B gyroscope's "SQUID" magnetometer (most sensitive when averaged over days)^[3]
10⁻¹⁷ T		10 aT	100 fG
10⁻¹⁶ T		100 aT	1 pG
10⁻¹⁵ T	femtotesla	1 fT	10 pG
10⁻¹⁵ T		2 fT	20 pG
10⁻¹⁴ T		10 fT	100 pG
10⁻¹³ T		100 fT	1 nG	Human brain
10⁻¹² T	picotesla	1 pT	10 nG	Human brain
10⁻¹¹ T		10 pT	100 nG	"Potholes" in the magnetic field found in the heliosheath around the Solar System reported by Voyager 1 (NASA, 2006)^[4]
10⁻¹⁰ T		100 pT	1 μG	Heliosphere
10⁻⁹ T	nanotesla	1 nT	10 μG
10⁻⁸ T		10 nT	100 μG
10⁻⁷ T		100 nT	1 mG	Coffeemaker (30 cm or 1 ft away)^[5]
10⁻⁷ T		100 nT to 500 nT	1 mG to 5 mG	Residential electric distribution lines (34.5 kV) (15 m or 49 ft away)^[5]^[6]
10⁻⁶ T	microtesla	1 μT	10 mG	Blender (30 cm or 1 ft away)^[5]
		1.3 μT to 2.7 μT	13 mG to 27 mG	High power (500 kV) transmission lines (30 m or 100 ft away)^[6]
		6 μT	60 mG	Microwave oven (30 cm or 1 ft away)^[5]
10⁻⁵ T		10 μT	100 mG
		24 μT	240 mG	Magnetic tape near tape head
		31 μT	310 mG	Earth's magnetic field at 0° latitude (on the equator)
		58 μT	580 mG	Earth's magnetic field at 50° latitude
10⁻⁴ T		100 μT	1 G	Magnetic flux density that will induce an electromotive force of 10^-8 volts in each centimeter of a wire moving perpendicularly at 1 ⁠centimeter/second⁠ by definition (1 gauss = 1 ⁠maxwell/centimeter²⁠)^[7]
10⁻⁴ T		500 μT	5 G	Suggested exposure limit for cardiac pacemakers by American Conference of Governmental Industrial Hygienists (ACGIH)
10⁻³ T	millitesla	1 mT	10 G	Refrigerator magnets (10 G^[8] to 100 G^[9])
10⁻² T	centitesla	10 mT	100 G	Refrigerator magnets (10 G^[8] to 100 G^[9])
10⁻² T	centitesla	30 mT	300 G	Penny-sized ferrite magnet
10⁻¹ T	decitesla	100 mT	1 kG	Penny-sized neodymium magnet
10⁻¹ T	decitesla	150 mT	1.5 kG	Sunspot
10⁰ T	tesla	1 T	10 kG	Inside the core of a 60 Hz power transformer (1 T to 2 T as of 2001^[update])^[10]^[11] or voice coil gap of a loudspeaker magnet (1 T to 2.4 T as of 2006^[update])^[12]
		1.5 T to 7 T	15 kG to 70 kG	Medical magnetic resonance imaging systems (in practice)^[13]^[14]^[15]
		9.4 T	94 kG	Experimental magnetic resonance imaging systems: NMR spectrometer at 400 MHz (9.4 T) to 500 MHz (11.7 T)
10¹ T	decatesla	10 T	100 kG
		11.7 T	117 kG
		16 T	160 kG	Levitate a frog by distorting its atomic orbitals^[16]
		23.5 T	235 kG	1 GHz NMR spectrometer^[17]
		32 T	235 kG	Strongest continuous magnet field produced by all-superconducting magnet^[18]^[19]
		38 T	380 kG	Strongest continuous magnetic field produced by non-superconductive resistive magnet^[20]
		45.22 T	452.2 kG	Strongest non-tiny continuous magnetic field produced in a laboratory (Steady High Magnetic Field Facility (SHMFF) in Hefei, China, 2022),^[21] beating previous 45 T record (National High Magnetic Field Laboratory's FSU, USA, 1999)^[22] (both are hybrid magnets, combining a superconducting magnet with a resistive magnet)
		45.5 T	455 kG	Strongest continuous magnetic field produced in a laboratory (National High Magnetic Field Laboratory's FSU, USA, 2019), though the magnet is tiny (only 390 grams)^[23]
10² T	hectotesla	100 T	1 MG	Strongest pulsed non-destructive ("multi-shot") magnetic field produced in a laboratory (Pulsed Field Facility at National High Magnetic Field Laboratory's Los Alamos National Laboratory, Los Alamos, NM, USA)^[24]
10³ T	kilotesla	1 kT	10 MG
		1.2 kT	12 MG	Record for indoor pulsed magnetic field, (University of Tokyo, 2018)^[25]
		2.8 kT	28 MG	Record for human produced, pulsed magnetic field, (VNIIEF, 2001)^[26]
10⁴ T		10 kT	100 MG
10⁴ T		35 kT	350 MG	Felt by valence electrons in a xenon atom due to the spin–orbit effect^[27]
10⁵ T		100 kT	1 GG	Non-magnetar neutron stars^[28]
10⁶ T	megatesla	1 MT	10 GG
10⁷ T		10 MT	100 GG
10⁸ T		100 MT	1 TG
10⁹ T	gigatesla	1 GT	10 TG	Schwinger limit (~4.41 GT) above which the electromagnetic field becomes nonlinear
10¹⁰ T		10 GT	100 TG	Magnetar neutron stars^[29]
10¹¹ T		100 GT	1 PG	Magnetar neutron stars^[29]
10¹² T	teratesla	1 TT	10 PG
10¹³ T		10 TT	100 PG
10¹³ T		16 TT	160 PG	Swift J0243.6+6124 most magnetic pulsar^[30]^[31]
10¹⁴ T		100 TT	1 EG	Magnetic fields inside heavy ion collisions at RHIC^[32]^[33]

References

^ "Bureau International des Poids et Mesures, The International System of Units (SI), 8th edition 2006" (PDF). bipm.org. 2012-10-01. Retrieved 2013-05-26.
^ Laboratory, National High Magnetic Field. "Tesla Definition - MagLab". nationalmaglab.org. Retrieved 2023-12-29.
^ Range, Shannon K'doah. Gravity Probe B: Examining Einstein's Spacetime with Gyroscopes. National Aeronautics and Space Administration. October 2004.
^ "Surprises from the Edge of the Solar System". NASA. 2006-09-21. Archived from the original on 2008-09-29. Retrieved 2017-07-12.
^ ^a ^b ^c ^d "Magnetic Field Levels Around Homes" (PDF). UC San Diego Dept. of Environment, Health & Safety (EH&S). p. 2. Archived from the original (PDF) on 2021-04-28. Retrieved 2017-03-07.
^ ^a ^b "EMF in Your Environment: Magnetic Field Measurements of Everyday Electrical Devices". United States Environmental Protection Agency. 1992. pp. 23–24. Retrieved 2017-03-07.
^ "Gauss | magnetic field, electromagnetism, mathematics | Britannica". www.britannica.com. Retrieved 2023-12-30.
^ adamsmagnetic (2021-01-04). "What Does Gauss Mean & What Does Gauss Measure?". Adams Magnetic Products, LLC. Retrieved 2023-12-29. [T]he pizza-shaped refrigerator magnet you got from your local pizzeria is 10 gauss
^ Laboratory, National High Magnetic Field. "Tesla Definition - MagLab". nationalmaglab.org. Retrieved 2023-12-29. A refrigerator magnet is 100 gauss, a strong refrigerator magnet.
^ Johnson, Gary L. (2001-10-29). "Inductors and transformers" (PDF). eece.ksu.edu. Archived from the original (PDF) on 2007-05-07. Retrieved 2013-05-26. A modern well-designed 60 Hz power transformer will probably have a magnetic flux density between 1 and 2 T inside the core.
^ "Trafo-Bestimmung 3von3". radiomuseum.org. 2009-07-11. Retrieved 2013-06-01.
^ Elliot, Rod (2006-12-16). "Power Handling Vs. Efficiency". Archived from the original on 2018-08-07. Retrieved 2008-02-17. Typical flux densities for (half decent) loudspeakers range from around 1 Tesla (10,000 Gauss) up to around 2.4T, and I would suggest that anything less than 1T is next to useless. Very few drivers use magnetic materials that will provide much more than 1.8T across the gap...
^ Savage, Niel (2013-10-23). "The World's Most Powerful MRI Takes Shape".
^ Smith, Hans-Jørgen. "Magnetic resonance imaging". Medcyclopaedia Textbook of Radiology. GE Healthcare. Archived from the original on 2012-02-07. Retrieved 2007-03-26.
^ Orenstein, Beth W. (2006-02-16). "Ultra High-Field MRI — The Pull of Big Magnets". Radiology Today. Vol. 7, no. 3. p. 10. Archived from the original on March 15, 2008. Retrieved 2008-07-10.
^ "Frog defies gravity". New Scientist. No. 2077. 12 April 1997.
^ "23.5 Tesla Standard-Bore, Persistent Superconducting Magnet". Archived from the original on 2013-06-28. Retrieved 2013-05-08.
^ "32 Tesla All-Superconducting Magnet". National High Magnetic Field Laboratory.
^ Liu, Jianhua; Wang, Qiuliang; Qin, Lang; Zhou, Benzhe; Wang, Kangshuai; Wang, Yaohui; Wang, Lei; Zhang, Zili; Dai, Yinming; Liu, Hui; Hu, Xinning; Wang, Hui; Cui, Chunyan; Wang, Dangui; Wang, Hao (2020-03-01). "World record 32.35 tesla direct-current magnetic field generated with an all-superconducting magnet". Superconductor Science and Technology. 33 (3): 03LT01. Bibcode:2020SuScT..33cLT01L. doi:10.1088/1361-6668/ab714e. ISSN 0953-2048. S2CID 213171620.
^ ingevoerd, Geen OWMS velden. "HFML sets world record with a new 38 tesla magnet". Radboud Universiteit.
^ "World's strongest steady magnetic field generated in China". New Atlas. 2022-08-16. Retrieved 2022-08-22.
^ "Mag Lab Press Release: World's Most Powerful Magnet Tested Ushers in New Era for Steady High Field Research (December 17, 1999)". legacywww.magnet.fsu.edu. Retrieved 2022-08-22.
^ Laboratory, National High Magnetic Field. "With mini magnet, National MagLab creates world-record magnetic field - MagLab". nationalmaglab.org. Archived from the original on 2023-06-10. Retrieved 2023-12-28.
^ Laboratory, Los Alamos National. "Physical Sciences | Organizations". Los Alamos National Laboratory. Retrieved 2023-12-29.
^ Nakamura, D.; Ikeda, A.; Sawabe, H.; Matsuda, Y. H.; Takeyama, S. (2018). "Record indoor magnetic field of 1200 T generated by electromagnetic flux-compression". Review of Scientific Instruments. 89 (9): 095106. Bibcode:2018RScI...89i5106N. doi:10.1063/1.5044557. PMID 30278742. S2CID 52908507.
^ Bykov, A.I.; Dolotenko, M.I.; Kolokolchikov, N.P.; Selemir, V.D.; Tatsenko, O.M. (2001). "VNIIEF achievements on ultra-high magnetic fields generation". Physica B: Condensed Matter. 294–295: 574–578. Bibcode:2001PhyB..294..574B. doi:10.1016/S0921-4526(00)00723-7.
^ Herman, Frank (15 December 1963). "Relativistic Corrections to the Band Structure of Tetrahedrally Bonded Semiconductors". Physical Review Letters. 11 (541): 541–545. Bibcode:1963PhRvL..11..541H. doi:10.1103/PhysRevLett.11.541.
^ Reisenegger, A. (2003). "Origin and Evolution of Neutron Star Magnetic Fields". arXiv:astro-ph/0307133.
^ Kaspi, Victoria M.; Beloborodov, Andrei M. (2017). "Magnetars". Annual Review of Astronomy and Astrophysics. 55 (1): 261–301. arXiv:1703.00068. Bibcode:2017ARA&A..55..261K. doi:10.1146/annurev-astro-081915-023329.
^ Kong, Ling-Da; Zhang, Shu; Zhang, Shuang-Nan; Ji, Long; Doroshenko, Victor; Santangelo, Andrea; Chen, Yu-Peng; Lu, Fang-Jun; Ge, Ming-Yu; Wang, Peng-Ju; Tao, Lian; Qu, Jin-Lu; Li, Ti-Pei; Liu, Cong-Zhan; Liao, Jin-Yuan (2022-07-01). "Insight-HXMT Discovery of the Highest-energy CRSF from the First Galactic Ultraluminous X-Ray Pulsar Swift J0243.6+6124". The Astrophysical Journal Letters. 933 (1): L3. arXiv:2206.04283. Bibcode:2022ApJ...933L...3K. doi:10.3847/2041-8213/ac7711. ISSN 2041-8205.
^ "Astronomers measure strongest magnetic field ever detected". New Atlas. 2022-07-15. Retrieved 2022-08-22.
^ Tuchin, Kirill (2013). "Particle production in strong electromagnetic fields in relativistic heavy-ion collisions". Adv. High Energy Phys. 2013: 490495. arXiv:1301.0099. doi:10.1155/2013/490495. S2CID 4877952.
^ Bzdak, Adam; Skokov, Vladimir (29 March 2012). "Event-by-event fluctuations of magnetic and electric fields in heavy ion collisions". Physics Letters B. 710 (1): 171–174. arXiv:1111.1949. Bibcode:2012PhLB..710..171B. doi:10.1016/j.physletb.2012.02.065. S2CID 118462584.