Magnetic flux (Φ) is a measure of the total magnetic field passing through a given area. It is defined as the surface integral of the normal component of the magnetic field B over a surface: Φ = ∫∫ B · dA. The SI unit is the Weber (Wb), where 1 Wb = 1 T·m² = 1 V·s. In the CGS system, the unit is the Maxwell (Mx), where 1 Wb = 10⁸ Mx. Magnetic flux is measured using fluxmeters, search coils, or calculated from known magnetic field strength and area.
Magnetic Flux Converter
Convert between Weber, Maxwell, Tesla·m², Volt-second, and other magnetic flux units used in physics, electrical engineering, and electromagnetic research.
Conversion Formula
1 Weber = 100,000,000 Maxwell
Common Magnetic Flux Conversions
Quick reference from Weber| From (Weber) | To Unit | Result |
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What is Magnetic Flux?
Magnetic flux (Φ) is a fundamental concept in electromagnetism that measures the total magnetic field passing through a given surface area. It is defined as the surface integral of the normal component of the magnetic field B over a surface. The SI unit of magnetic flux is the Weber (Wb), named after German physicist Wilhelm Eduard Weber.
Mathematically, magnetic flux is expressed as: Φ = B × A × cos(θ), where B is the magnetic flux density (in Tesla), A is the area (in square meters), and θ is the angle between the magnetic field and the surface normal. When the field is perpendicular to the surface (θ = 0°), the flux is maximized: Φ = B × A.
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SI Unit: Weber (Wb) 1 Wb = 1 T·m² = 1 V·s = 10⁸ Maxwell
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CGS Unit: Maxwell (Mx) 1 Mx = 10⁻⁸ Wb, named after James Clerk Maxwell
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Derived Unit: Tesla·m² Equivalent to Weber, commonly used in physics
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Electrical Unit: Volt-second (V·s) From Faraday's law: 1 Wb = 1 V·s
How to Use This Converter
Our magnetic flux converter is designed for physicists, electrical engineers, and researchers who need precise unit conversions for electromagnetic calculations.
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Select Source Unit Choose the unit you want to convert from (Weber, Maxwell, Tesla·m², etc.)
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Select Target Unit Choose the unit you want to convert to from the second dropdown
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Enter Value Type the magnetic flux value — results appear instantly as you type
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View Formula The exact conversion formula is displayed below for verification
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Swap Units Click the swap button to instantly reverse the conversion direction
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Reference Table Use the common conversions table for quick reference values
Applications of Magnetic Flux
Magnetic flux is fundamental to modern technology and scientific research. Understanding and measuring magnetic flux is essential in these fields:
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Electric Generators & Motors Converting mechanical energy to electrical energy through changing magnetic flux
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Transformers Transferring electrical energy between circuits via magnetic flux linkage
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Inductors & Coils Storing energy in magnetic fields, used in filters and power supplies
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MRI Machines Medical imaging using strong magnetic fields and flux measurements
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Particle Accelerators Guiding charged particles using precisely controlled magnetic flux
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Magnetic Storage Hard drives and magnetic tape storing data via magnetic flux patterns
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Hall Effect Sensors Measuring magnetic flux for position, speed, and current sensing
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Wireless Charging Transferring power via electromagnetic induction and magnetic flux
Frequently Asked Questions
The SI unit of magnetic flux is the Weber (Wb), named after German physicist Wilhelm Eduard Weber (1804–1891). One Weber equals:
- 1 Tesla × 1 square meter (1 Wb = 1 T·m²)
- 1 Volt-second (1 Wb = 1 V·s)
- 100,000,000 Maxwell (1 Wb = 10⁸ Mx)
- 10 lines of magnetic flux
To convert Weber to Maxwell, multiply the Weber value by 100,000,000 (10⁸):
- 1 Weber = 100,000,000 Maxwell
- 0.5 Weber = 50,000,000 Maxwell
- 0.001 Weber = 100,000 Maxwell
These are related but distinct concepts:
- Magnetic Flux (Φ): Total magnetic field through an area, measured in Webers (Wb). It represents the "amount" of magnetic field.
- Magnetic Flux Density (B): Magnetic field per unit area, measured in Tesla (T). It represents how concentrated the field is.
A Volt-second (V·s) is an alternative unit for magnetic flux that is exactly equal to one Weber: 1 V·s = 1 Wb. This equivalence comes from Faraday's Law of Electromagnetic Induction, which states that the induced electromotive force (EMF) equals the negative rate of change of magnetic flux: EMF = -dΦ/dt. Therefore, 1 Wb of flux changing in 1 second induces 1 Volt of EMF. This unit is commonly used in electrical engineering and circuit analysis.
Tesla square meter (T·m²) is the derived SI unit for magnetic flux, exactly equal to one Weber. It represents the magnetic flux through a one-square-meter surface when the magnetic flux density is one Tesla perpendicular to the surface. This unit is commonly used in physics and electrical engineering calculations because it directly shows the relationship between flux density (Tesla) and area (m²). For example, a 2 T magnetic field through a 0.5 m² area produces 1 T·m² = 1 Wb of flux.
The Maxwell (Mx) is the CGS (centimeter-gram-second) unit of magnetic flux, named after Scottish physicist James Clerk Maxwell (1831–1879). One Maxwell equals 10⁻⁸ Weber (100 million Maxwell = 1 Weber). The Maxwell is defined as the flux through a 1 cm² area in a 1 Gauss magnetic field. While the Weber is the modern SI unit, the Maxwell is still used in:
- Older scientific literature
- Astrophysics and plasma physics
- Certain engineering applications in the US
- Historical physics textbooks
Faraday's Law of Electromagnetic Induction is one of the most important laws in physics, stating that the induced electromotive force (EMF) in a closed circuit equals the negative rate of change of magnetic flux through the circuit: EMF = -dΦ/dt. This means:
- A changing magnetic flux induces a voltage
- The faster the flux changes, the higher the induced voltage
- The negative sign (Lenz's Law) indicates the induced current opposes the change
Magnetic flux is fundamental to modern technology:
- Electric generators: Convert mechanical energy to electrical via changing flux
- Electric motors: Use magnetic flux to produce rotational motion
- Transformers: Transfer energy between circuits via magnetic flux linkage
- Inductors: Store energy in magnetic fields
- MRI machines: Use strong magnetic fields for medical imaging
- Particle accelerators: Guide charged particles using controlled flux
- Hard drives: Store data via magnetic flux patterns
- Hall effect sensors: Measure magnetic flux for sensing applications
- Wireless charging: Transfer power via electromagnetic induction
- Electromagnetic brakes: Use flux for braking in trains and vehicles
Yes, our converter uses scientifically-verified conversion factors from NIST (National Institute of Standards and Technology) and the International System of Units (SI). Results are accurate to 10 significant digits, suitable for:
- Academic research and physics calculations
- Electrical engineering design
- Laboratory measurements
- Professional applications
Yes. Once the page loads, all calculations happen locally in your browser. There is no server-side processing, no API calls, and no internet dependency for conversions. This makes the tool perfect for:
- Laboratory work without internet
- Field research in remote locations
- Classroom use in schools with limited connectivity
- Industrial environments with restricted network access
Yes, the ASLI FORM Magnetic Flux Converter is 100% free forever. There are no registration requirements, no usage limits, no subscription fees, and no hidden charges. We do not display advertisements and we do not collect any personal data. Our mission is to provide premium scientific tools that are accessible to students, researchers, engineers, and professionals worldwide.
Absolutely. Our converter is designed with a mobile-first responsive approach and works perfectly on every device — from basic keypad phones to 4K desktop displays. The interface adapts intelligently: desktops get a sidebar, tablets get a collapsible sidebar, and mobile devices get optimized dropdowns. Touch interactions, scroll snapping, and momentum scrolling are all optimized for mobile use.
Lenz's Law states that the direction of an induced current is such that it opposes the change in magnetic flux that produced it. This is represented by the negative sign in Faraday's Law: EMF = -dΦ/dt. In practical terms:
- If magnetic flux through a loop increases, the induced current creates a magnetic field that opposes the increase
- If magnetic flux decreases, the induced current creates a field that tries to maintain the flux
- This is a consequence of the conservation of energy
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