Magnetomotive Force Converter
ScienceConvert magnetomotive force between ampere-turns, kiloampere-turns, and gilberts instantly — used for electromagnet and transformer design.
From
To
All conversionsfor 1 Gilbert (Gb)
| Kiloampere-Turns (kAt) | 0.0007957747 |
| Ampere-Turns (At) | 0.7957747 |
| Gilbert (Gb) | 1 |
What is a Magnetomotive Force?
The Magnetomotive Force Converter converts magnetomotive force between ampere-turns, kiloampere-turns (SI), and gilberts (the legacy CGS unit). Magnetomotive force measures the magnetic driving force that produces flux in a magnetic circuit — the magnetic analogue of voltage in an electrical circuit, and a key quantity in electromagnet, transformer, and motor field winding design.
Enter a value in any supported unit and the converter calculates the equivalent instantly. For the related field-strength quantity, see the Magnetic Field Strength Converter.
How to use this Magnetomotive Force calculator
- Choose your starting unit from the source dropdown — for example, "Gilbert (Gb)".
- Enter the numeric value you want to convert in the input field.
- Choose your target unit from the destination dropdown — for example, "Ampere-Turns (At)".
- Read the converted result, which updates instantly as you type or change units.
- Use the swap (⇅) button if you need to reverse the conversion direction.
- Use the copy button to grab the result for an electromagnet or transformer design calculation.
Formula & Methodology
The converter's base unit is ampere-turns (At). Every supported unit has a fixed multiplier: - 1 kiloampere-turn (kAt) = 1,000 At - 1 gilbert (Gb) ≈ 0.7957747 At Any conversion follows: Result = Input × (toBase of source unit ÷ toBase of target unit) Worked example — converting 100 ampere-turns to gilberts: Result = 100 × (1 ÷ 0.7957747) = 125.66 gilberts This is the equivalent value you'd see in a CGS-based physics or older engineering reference.
Frequently Asked Questions
Magnetomotive force (MMF) measures the magnetic driving force that produces magnetic flux in a magnetic circuit, expressed in ampere-turns — it's the magnetic analogue of electromotive force (voltage) in an electrical circuit, calculated as current multiplied by the number of coil turns producing the field.
Divide the ampere-turn value by 0.7957747, since one gilbert equals approximately 0.7957747 ampere-turns. Enter your value with 'Ampere-Turns (At)' as the source and 'Gilbert (Gb)' as the target to apply this automatically.
Magnetomotive force depends on both the current flowing through a coil and how many times that coil is wound around the magnetic core — a coil with more turns produces more magnetic driving force for the same current, so the unit reflects both factors multiplied together.
The gilbert is the CGS unit of magnetomotive force, predating the more commonly used SI ampere-turn — it persists in some older scientific literature and specialised magnetics references, particularly those with historical ties to the CGS unit system.
Magnetic field strength (in ampere-turns per metre) equals magnetomotive force divided by the length of the magnetic path — MMF is the total driving force, while field strength is that force distributed along the specific path length. See the [Magnetic Field Strength Converter](/magnetic-field-strength-converter/) for that related quantity.
Transformer and electromagnet designers calculate required magnetomotive force to achieve a target magnetic flux through the core, then work backward to determine the necessary combination of coil turns and current to produce that MMF.
This varies enormously by application — a small relay electromagnet might need only a few ampere-turns, while an industrial lifting electromagnet could require thousands of ampere-turns, so context determines what's typical for a specific design.
Magnetic circuits follow a formula analogous to Ohm's law, where magnetomotive force plays the role of voltage, magnetic flux plays the role of current, and reluctance (the magnetic circuit's resistance to flux) plays the role of electrical resistance.
The sign of magnetomotive force depends on the current direction and coil winding direction relative to a defined reference — in multi-coil magnetic circuits, MMF contributions can effectively add or oppose each other depending on these directional conventions.
Electromagnet and solenoid design, transformer and inductor core design, and motor design (calculating field winding requirements) all routinely work with magnetomotive force calculations, occasionally needing conversion between the SI ampere-turn and legacy CGS gilbert units.
Also known as