Magnetomotive Force Converter

Magnetomotive force (F, or MMF) is what drives magnetic flux around a magnetic circuit, as a voltage drives current around an electric one. For a coil, it is the current times the number of turns: F = N * I. Its SI unit is the ampere-turn (AT), often written as just amperes. The CGS unit is the gilbert (Gi).

A coil of 200 turns carrying 1.5 A has an MMF of 200 * 1.5 = 300 AT.

How to convert magnetomotive force

Type a value into any field, and every other unit is calculated at once. One gilbert is 10 / (4 * π), about 0.796 AT. For example, 300 AT:

1. In gilberts: multiply by 1.25664.

   300 * 1.25664 = 377 Gi

2. In kiloampere-turns: divide by 1,000.

   300 / 1,000 = 0.3 kAT

The MMF divided by the length of the magnetic path gives the field strength in A/m, converted in the Magnetic Field Strength Converter.

Common conversions

Magnetomotive force units

• Ampere-turn (AT): Ampere-turn is the base unit of magnetomotive force, equal to one ampere of current flowing through a single turn in a coil.
  Conversion Factor: 1 AT = 1 AT

• Kiloampere-turn (kAT): Kiloampere-turn is a larger unit of magnetomotive force, representing one thousand amperes of current flowing through a single turn in a coil.
  Conversion Factor: 1 kAT = 1,000 AT

• Milliampere-turn (mAT): Milliampere-turn is a smaller unit of magnetomotive force, where one milliampere of current flows through a single turn in a coil.
  Conversion Factor: 1 mAT = 0.001 AT

• Abampere-turn (abAT): Abampere-turn is a unit of magnetomotive force in the CGS (centimeter-gram-second) system. It represents the magnetomotive force produced by one abampere of current flowing through a single turn in a coil.
  Conversion Factor: 1 abAT = 10 AT

• Gilbert (Gi): Gilbert is an older unit of magnetomotive force in the CGS system.
  Conversion Factor: 1 Gi ≈ 0.7957747 AT