Orders of Magnitude (magnetic Field) | Orders Magnitude (magnetic Field)

This page lists examples of magnetic induction B in teslas and gauss produced by various sources. They are grouped by orders of magnitude, and each section covers three orders of magnitude, or a factor of one thousand.

Note:

Traditionally, magnetizing field H, is measured in amperes per meter. Magnetic induction B (also known as magnetic flux density) has SI units teslas or . When we are using these units in vacuum, one tesla is equal to 104 gauss.
Magnetic field drops off as the cube of the distance from the source (for a dipole). These examples attempt to make the measuring point clear, usually the surface of the item mentioned.

**List of orders of magnitude for magnetic fields**
Factor (tesla)	SI prefix	Value	Value (Gauss)	Item
10−18	attotesla	5 aT	50 fG	SQUID magnetometers on Gravity Probe B gyroscopes measure fields at this level over several days of averaged measurements
10−15	femtotesla	2 fT	20 pG	SQUID magnetometers on Gravity Probe B gyros measure fields at this level in about one second
10−12	picotesla	0.1 - 1.0 pT	1 - 10 nG	human brain magnetic field
10−11		1.0×10−11 T	100 nG	In September 2006, NASA found "potholes" in the magnetic field in the heliosheath around our solar system that are 10 picoteslas as reported by Voyager 1
10−9	nanotesla	0.1 nT to 10 nT	1 - 100 µG	magnetic field strength in the heliosphere
10−6	microtesla	24 µT	240 mG	strength of magnetic tape near tape head
10−5		31 µT	310 mG	strength of Earth's magnetic field at 0° latitude (on the equator)
10−5		58 µT (5.8×10−5 T)	580 mG	strength of Earth's magnetic field at 50° latitude
10−3	millitesla	0.5 mT	5 G	the suggested exposure limit for cardiac pacemakers by American Conference of Governmental Industrial Hygienists (ACGIH)
10−3	millitesla	5 mT	50 G	the strength of a typical refrigerator magnet
10−1		0.15 T	1.5 kG	the magnetic field strength of a sunspot
100	tesla	1 T to 2.4 T	10 - 24 kG	coil gap of a typical loudspeaker magnet.
		1 — 2 T		inside the core of a modern 60 Hz power transformer
		1.25 T	12.5 kG	strength of a modern neodymium-iron-boron (Nd₂Fe₁₄B) rare earth magnet. A coin-sized neodymium magnet can lift more than 9 kg, pinch skin and erase credit cards.
		1.5 T to 3 T	15 - 30 kG	strength of medical magnetic resonance imaging systems in practice, experimentally up to 8 T
		9.4 T	94 kG	Modern high resolution research magnetic resonance imaging system
101		11.7 T	117 kG	field strength of a 500 MHz NMR spectrometer
		16 T	160 kG	strength used to levitate a frog
		23.5 T	235 kG	field strength of a 1 GHz NMR spectrometer
		36.2 T	362 kG	strongest continuous magnetic field produced by non-superconductive resistive magnet.
		45 T	450 kG	strongest continuous magnetic field yet produced in a laboratory (Florida State University's National High Magnetic Field Laboratory in Tallahassee, USA).
102		100.75 T	1 MG	strongest (pulsed) magnetic field yet obtained non-destructively in a laboratory (National High Magnetic Field Laboratory, Los Alamos National Laboratory, USA)
102		730 T	7.3 MG	strongest pulsed magnetic field yet obtained in a laboratory, destroying the used equipment, but not the laboratory itself (Institute for Solid State Physics, Tokyo)
103	kilotesla	2.8 kT	28 MG	strongest (pulsed) magnetic field ever obtained (with explosives) in a laboratory (VNIIEF in Sarov, Russia, 1998)
106	megatesla	1 to 100 MT (106 T to 108 T)	10 - 1000 GG (0.01 - 1 TG)	strength of a neutron star
109	gigatesla	0.1 to 100 GT (108 to 1011 T)	1 - 1000 TG (0.001 - 1 PG)	strength of a magnetar

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