Magnetic flux density is measured in tesla in SI and gauss in the older CGS system, where 1 T = 10,000 G. A weber per square metre is identical to a tesla. Earth's magnetic field is only about 25 to 65 microtesla (0.25 to 0.65 G), a fridge magnet is around 5 mT, a strong neodymium magnet surface can reach 1 T, and hospital MRI scanners typically run at 1.5 or 3 T. Magnet suppliers often quote gauss while physics texts use tesla, so this converter helps compare them directly.
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