Magnetic flux density is measured in several different units depending on the field and era — tesla in modern SI physics and MRI medicine, gauss in older CGS literature and many datasheets. This converter translates between them instantly so you don't have to remember the conversion factors.
How the Magnetic Field Converter works
All five units this converter supports — tesla (T), millitesla (mT), microtesla (µT), gauss (G), and milligauss (mG) — are fixed multiples of the tesla, the SI base unit of magnetic flux density. The converter multiplies your input by the source unit's factor and divides by the target unit's factor, routing every conversion through tesla. The core relationship to remember is 1 T = 10,000 G, since gauss is the CGS unit and tesla is 10,000 times larger.
Inputs and what they mean
Enter any numeric value, positive or negative, and pick the unit it's currently expressed in (From) plus the unit you want (To). The result updates live as you type. The Reference tab lists all five units against 1 tesla at once, and the Common Fields tab shows how real-world magnets and devices compare — from Earth's field (~50 µT) to a clinical MRI scanner (1.5–3 T).
Limits and edge cases
This calculator converts magnetic flux density (B-field) only — it does not convert the related but distinct magnetic field intensity (H-field, measured in amperes per meter or oersteds), which requires knowing the medium's permeability. It also performs a pure unit conversion, not a physical field calculation (such as the field from a current-carrying wire or magnet) — for that, see a magnetic force or electric field calculator.