the unit of magnetic field is tesla (si unit ) and gauss (cgs ) unit.
1 tesla = 10,000 gauss .
1 tesla= 1N/mA
Answer
It depends on what you mean by 'magnetic field'. If you mean 'magnetic flux', then the SI unit is the weber(pronounced 'vay-ber'). If you mean 'magnetic flux density', then the SI unit is the tesla. If you mean 'magnetic field strength', then the SI unit is the ampere per metre.