Enter a value and pick its unit (tesla, millitesla, microtesla, gauss, milligauss, kilogauss), and the tool converts it to every other magnetic-field unit live.
1 tesla (T) = 10,000 gauss (G).
Earth's field is about 0.25–0.65 gauss, roughly 25–65 microtesla.
A common MRI scanner is 1.5 T or 3 T, i.e. 15,000–30,000 gauss.