RFrftools.io
Convert

Magnetic Flux Density Converter

Convert magnetic flux density between Tesla, milliTesla, microTesla, Gauss, and nanoTesla for sensor and motor applications.

Loading calculator...

Formula

1 T = 10⁴ G = 10³ mT = 10⁶ μT

How It Works

Magnetic flux density (B-field) is measured in Tesla (T), the SI unit. One Tesla equals 10,000 Gauss (the CGS unit). In practice: Earth's field is about 50 μT, Hall-effect sensors operate in the mT range, permanent magnets produce 0.1–1 T, and MRI scanners use 1.5–7 T. The nanotesla (nT) is used in geomagnetic and magnetometer measurements.

Worked Example

A neodymium magnet surface field of 0.5 T: 0.5 T = 500 mT = 500,000 μT = 5,000 Gauss = 500,000,000 nT. Earth's magnetic field of 50 μT: 50 μT = 0.05 mT = 0.00005 T = 0.5 Gauss = 50,000 nT.

Practical Tips

  • ✓Most Hall-effect sensors (AH49, A1302, etc.) have a linear range of ±0.1 T (±1000 Gauss) and sensitivity of ~1–5 mV/Gauss.
  • ✓For motor position sensing, the magnet field at the sensor face should be 30–100 mT for reliable operation — too weak causes noise, too strong causes saturation.
  • ✓Magnetometers in smartphones and compasses sense Earth's ~50 μT field. Keep them away from motors, speakers, and power cables that generate fields in the mT range.

Common Mistakes

  • ✗Confusing Tesla (flux density, T) with Weber (total flux, Wb) — they are different quantities; 1 T = 1 Wb/m².
  • ✗Gauss and Tesla are related by 1 T = 10,000 G; forgetting this factor leads to 10,000× errors when switching between CGS and SI units.
  • ✗Hall-effect sensor datasheets may specify sensitivity in mV/Gauss or mV/mT; always check the unit before calculating output voltage.

Frequently Asked Questions

B is the flux density in Tesla and includes the effect of the material. H is the driving field in A/m. They are related by B = μ₀μᵣH where μ₀ = 4π × 10⁻⁷ H/m and μᵣ is the relative permeability.
Gauss remains common in permanent magnet and motor industry datasheets because many legacy tools and references use CGS units. 1 T = 10,000 G — easy to remember when switching.
Most consumer electronics are sensitive to fields above ~1–10 mT (10–100 Gauss). Hard drives and magnetic-stripe cards can be affected above a few mT. Erase fields are typically 50–100 mT.
Earth's field is ~50 μT. A small DC motor can generate 1–100 mT at its surface. This is why motor proximity can disturb compasses and magnetometer-based heading systems.

Related Calculators

Sensor

Hall Effect Sensor

Calculate Hall voltage, Hall coefficient, and sensitivity for Hall effect sensors. Useful for magnetic field measurement, current sensing, and position detection.

Convert

Inductance Converter

Convert inductance between henries, millihenries, microhenries, nanohenries, and picohenries.

Convert

Current Converter

Convert electric current between amperes, milliamperes, microamperes, nanoamperes, and picoamperes.

Convert

Frequency ↔ Wavelength

Convert frequency to wavelength in any medium. Calculates full, half, and quarter wavelengths for antenna design, transmission line, and RF system planning.

Convert

dBm ↔ Watts

Convert RF power between dBm, Watts, milliwatts, dBW, dBμV, and RMS volts into 50Ω. Essential for link budgets, amplifier analysis, and RF system design.

Convert

Temperature Converter

Convert temperature between Celsius, Fahrenheit, Kelvin, Rankine, and Réaumur scales. Useful for thermal analysis, datasheet comparison, and engineering calculations.