Electric Fields
Electric fields are usually measured in volts per metre (V/m)
- Multiple is used for large fields: 1 kilovolt per metre (kV/m) = 1000 volts per metre
Magnetic Fields
Magnetic fields are usually measured in microteslas (µT)
- Multiple used for large fields: 1 millitesla = 1000 microteslas
- or small fields: 1 nanotesla = 0.001 microteslas
Other units are sometimes used:
- 1 milligauss = 0.1 microteslas (milligauss is common in the USA)
- 1 ampere per metre = 1.25 microteslas
- (this conversion for amperes per metre is only true for air and other non-magnetic materials. It changes in the pressure of magnetic materials such as iron.)
Converting between magnetic field units
Use either this calculator or the diagram below to convert from one magnetic field unit to the others (enter your value and select the units in the white cells):
Note: this tool is hosted on the Cloud. If you do not see the calculator, but get a message “proxy server is refusing connections”, this probably means that Cloud services are barred by your internet service. Contact us if you would particularly like to see this tool. The full functionality is supported only for desktops and laptops – mobile devices may not allow all the interactivity.