About the Magnetic Flux Density Converter
The Magnetic Flux Density Converter translates readings between tesla, millitesla, and gauss, the three units most commonly seen on magnet spec sheets, MRI documentation, and physics coursework. Anyone comparing a permanent magnet's rated field strength, checking a gaussmeter reading against a datasheet, or converting Earth's ambient field into lab-instrument units needs a fast way to move between the SI unit (tesla) and the older CGS unit (gauss) that still shows up on US-market magnet listings.
How It Works
Enter a value along with its starting unit and the unit you want it displayed in; the calculator converts through a shared tesla-based scale, where 1 tesla equals 1,000 millitesla and 10,000 gauss. The result appears immediately in decimal form, and a reference table below it repeats the same conversion for a fixed set of input values (1, 5, 10, 25, 50, 100) so the ratio is visible at several magnitudes at once.
Examples
Converting a magnet's gauss rating to tesla
The default 5,000 gauss input converts to 0.5 tesla (5000 x 0.0001 = 0.5), useful for comparing a neodymium magnet's US-market rating against the SI figure used in engineering specs.
Millitesla to gauss for a lab probe reading
A 3 mT reading from a handheld gaussmeter converts to 30 gauss (3 x 0.001 / 0.0001 = 30), matching the 10-gauss-per-millitesla relationship between the two units.
Advantages
- Removes manual multiplication or division by 10,000 when switching between tesla and gauss.
- Includes millitesla as a middle unit for moderate field strengths like small motors or sensors.
- Shows a multi-row comparison table so the ratio can be checked across several magnitudes in one view.
Common Mistakes
- Assuming 1 tesla equals 1,000 gauss instead of the correct 10,000.
- Reading a gauss value off an older datasheet and entering it without switching the "From" unit away from tesla.
- Treating a millitesla reading and a milligauss reading as interchangeable, when they differ by another factor of 1,000.
Edge Cases to Watch For
- Because gauss is 10,000 times smaller than tesla, converting a large gauss reading into tesla produces a small decimal, and rounding to 6 decimal places can hide precision loss on very small source values.
- The tool performs a straight linear unit conversion; it does not distinguish whether the reading is a peak, RMS, or average field measurement, which matters when comparing AC electromagnet specs.
- No direction or vector component is captured, only the scalar magnitude of the flux density value entered.
Common Use Cases
- Physics and engineering students checking textbook problems that mix SI and CGS magnetic units.
- Hobbyists and makers comparing magnet strength ratings across US and international product listings.
- Technicians cross-referencing gaussmeter field readings against equipment rated in tesla or millitesla.