Magnetism Converter

Why magnetic units must be separated by quantity family

Magnetism references often place A/m, Oe, Wb, Mx, T, G, gamma, A-turn, and gilbert close together. The symbols are easy to confuse because the underlying quantities appear in the same magnetic-circuit problems, but a direct unit conversion should not cross from one physical quantity into another.

The calculator therefore starts with a quantity-family choice. It can convert magnetic field strength H within A/m and oersted notation, magnetic flux within weber and maxwell notation, magnetic flux density B within tesla and gauss notation, and magnetomotive force within ampere-turn and gilbert notation. It does not infer area, path length, permeability, reluctance, time variation, or coil turns unless those belong to the same unit family.

Magnetic field strength conversions: A/m, kA/m, and oersted

Magnetic field strength H describes the magnetizing force per magnetic path length. Modern SI work reports it in ampere per metre, often scaled to kiloampere per metre for larger values. Older CGS-oriented references still use oersted.

Use the field-strength panel for A/m, kA/m, and Oe. Do not use it to turn field strength into flux density unless the material permeability and physical assumptions are known separately.

Magnetic flux conversions: weber, maxwell, volt-second, and line

Magnetic flux describes the total magnetic field passing through a chosen surface. The SI unit is the weber, while older references may use maxwell, line, kiloline, megaline, or gauss square centimetre. Electrical contexts may also write the same SI quantity as volt-second, and field-times-area notes may write it as tesla square metre.

Use the magnetic flux panel for Wb, kWb, mWb, uWb, nWb, V*s, T*m^2, Mx, G*cm^2, line, kiloline, megaline, and magnetic flux quantum. Signed flux values are preserved because the sign usually reflects the chosen surface normal or winding convention.

Magnetic flux density conversions: tesla, gauss, Wb/m^2, and gamma

Magnetic flux density B describes magnetic flux per unit area. It is commonly reported in tesla, millitesla, microtesla, or nanotesla in SI work. Older or domain-specific references may use gauss, milligauss, gamma, or Wb/m^2.

Use the flux-density panel for tesla to gauss, gauss to tesla, microtesla to gauss, gamma to nanotesla, and Wb/m^2 comparisons. If the problem asks for total flux, area is still required.

Magnetomotive force conversions: ampere-turn and gilbert

Magnetomotive force is the driving quantity in a magnetic circuit. Practical engineering notes often write it as ampere-turn because current and turns appear together in coil work, while coherent SI describes the quantity in amperes. Legacy CGS references may use gilbert.

Use the MMF panel for ampere-turn, kiloampere-turn, and gilbert. The converter stops at the unit translation; it does not calculate field strength, flux density, or total flux from geometry, path length, reluctance, or material behaviour.

Worked examples across the consolidated converter

For field strength, 1 Oe converts to about 79.5775 A/m. That answer stays in the H family; it is not a tesla or gauss result unless a separate permeability model supports the next step.

For magnetic flux, 3 mWb is 0.003 Wb, 0.003 V*s, and 300,000 Mx. A signed value such as -800 Mx becomes -0.000008 Wb, preserving the orientation convention from the source problem.

For flux density, 1 T is 10,000 G, and 50 uT is 0.5 G. For magnetomotive force, 100 Gi is about 79.5775 A-turn, which is the notation many coil and core notes expect before moving into magnetic-circuit equations.

Practical scale checks for magnetic unit conversions

Competitor magnetic field converters often help users by showing familiar scale examples such as Earth's field, permanent magnets, and MRI scanners. This page keeps that idea but ties every scale check back to the correct quantity family so a magnetic field converter does not quietly mix tesla, gauss, oersted, weber, and gilbert.

Earth-field and smartphone magnetometer readings usually belong in the flux-density panel, where microtesla, nanotesla, gauss, milligauss, and gamma can be compared directly. A common sanity range is about 25-65 uT, or 0.25-0.65 G, depending on location and component direction.

Legacy oersted values belong in the field-strength panel unless the source explicitly states a free-space relationship or a material permeability model. Coil and core notes that report gilbert or ampere-turn belong in the magnetomotive-force panel, where a signed value can preserve the chosen current or winding convention but still cannot determine flux without reluctance, path length, and material context.

When a magnetism unit conversion is not enough

A unit conversion translates notation. It does not decide magnetic material response, field uniformity, coil design, air-gap behaviour, sensor calibration, magnetic shielding, or electromagnetic induction. Those tasks need the relevant geometry, material data, measurement setup, and governing equations.

Use this magnetism converter as a clean reference step when reading mixed SI and CGS material. If the next step asks for H from B, B from flux, flux from a coil, or voltage from changing flux, move into the specific physics or engineering calculation instead of forcing that result out of a unit table.