Magnetic Field Converter

1. Enter the value you want to convert.
2. Choose the from unit.
3. Choose the to unit.
4. Read the result and the conversion rate.

Here is what each result means:

A magnetic field is the region around a magnet or current where magnetic forces act. Its strength, more precisely the magnetic flux density, is what these units measure. The SI unit is the tesla, a large unit: the Earth's field is only about 50 microtesla, while a strong medical scanner reaches a few tesla.

The other common unit is the gauss, from the older centimetre-gram-second system, and it is still widely used for everyday magnets. The key relationship is that one tesla equals exactly ten thousand gauss. So a fridge magnet of a few hundred gauss is only a few tens of millitesla, and the millitesla and microtesla prefixes cover the everyday and natural range that the whole tesla is too big for.

This converter bridges every unit through the tesla. It multiplies your value by the number of tesla in its unit, then divides by the number in the target unit. Because each unit has a fixed value, the conversions are exact and never change.

Note that this measures magnetic flux density, the field strength at a point, not total magnetic flux, which is measured in webers. It also differs from magnetic field strength in amperes per metre. This converter deals only with flux density units like tesla and gauss.

It converts through the tesla, the SI unit of magnetic flux density.

1. Your value is multiplied by its unit's value in tesla.
2. That gives the field in tesla, the common base.
3. Dividing by the target unit's value gives the result.

For related quantities, see the frequency converter and the power converter.

Convert 1 T to gauss.

Result: 1 tesla is 10,000 G, the defining relationship between the two units. So a 1.5 tesla scanner is 15,000 gauss, and a 200 gauss fridge magnet is 20 millitesla.

Every unit has a fixed value in tesla.

The gauss at one ten-thousandth of a tesla is the bridge between the two systems. A gauss is ten microtesla, and a kilogauss is one tenth of a tesla, so the prefixes let you keep numbers in a comfortable range whichever family you use.

Magnetic fields span an enormous range, from the brain to a scanner.

Comparing sources this way shows why several units survive. The Earth's field sits near half a gauss, everyday magnets are in the hundreds of gauss, and scanners run to tesla, so gauss suits the small and tesla the large.

The Two Units

The ratio between the from-unit and to-unit sets the result; each has a fixed value in tesla.

The Tesla-gauss Link

One tesla is exactly ten thousand gauss, the anchor for the whole conversion.

The Size of the Unit

A large unit like the tesla gives small numbers, while a small one like the milligauss gives large ones.

Physics and Engineering

Convert a field between tesla and gauss for a calculation or a datasheet.

Medical Imaging

Express a scanner strength in tesla and in gauss for context.

Magnet Specs

Compare a magnet quoted in gauss with a value in millitesla.

1. Slipping the Tesla-gauss Factor

One tesla is 10,000 gauss. Missing this four-zero factor is the most common error.

2. Confusing Flux Density with Flux

Tesla and gauss measure flux density at a point. Total flux is measured in webers.

3. Mixing Gauss and Milligauss

A gauss is a thousand milligauss. Environmental fields are often quoted in milligauss.

4. Wrong Direction

Check which unit is the from and which is the to; swapping them inverts the result.

5. Confusing Flux Density with Field Strength

Tesla measures flux density; the field strength H is a different quantity in amperes per metre.

Conversions use fixed factors relative to the tesla.

Exactly 10,000 gauss. So to convert tesla to gauss, multiply by 10,000, and to convert gauss to tesla, divide by 10,000.

About 50 microtesla, or roughly half a gauss, though it varies with location from about 25 to 65 microtesla.

Both measure magnetic flux density. The tesla is the SI unit; the gauss is the older unit, and one tesla equals 10,000 gauss.

Commonly 1.5 or 3 tesla, which is 15,000 or 30,000 gauss. Research scanners can be higher, and the field is far stronger than any household magnet.

Flux density, the field strength at a point. Total magnetic flux through an area is measured in webers, a different unit.

A typical fridge magnet is a few hundred gauss, which is a few tens of millitesla, or tens of thousands of microtesla close to its surface.

A kilogauss is a thousand gauss, or one tenth of a tesla. It is used for moderately strong magnets and lab equipment.

Not exactly. Flux density B is in tesla; the magnetic field strength H is in amperes per metre. They are related through the material.

No. The calculation runs in your browser and nothing you enter is stored or sent anywhere, unless you choose Save, which keeps the result only on this device.

• Tesla (unit) (Wikipedia).
• Gauss (unit) (Wikipedia).
• Magnetic flux density (Wikipedia).