Calculator
What the Magnetic Field Converter does
Magnetic Field Converter: 1 T = 10000 G, so multiply a tesla value by 10000 to get gauss, or divide to go back. Example: 1 T = 10000 G.
Supply Value, From and To and you get Result, How it was calculated and Reverse conversion back. Edit a field and the answer updates in place.
Typical users are anyone working across two measurement systems. Having the exact factor matters more than a rough mental estimate.
There is no back end here. The calculation runs where you are sitting, not on a server somewhere.
The rest of this page documents each field, the method, and a worked example built from the values the magnetic field converter loads by default.
What do the Magnetic Field Converter fields mean?
The Magnetic Field Converter uses 3 inputs. You can work from the defaults, or clear them and start fresh, both work.
| Field | What to enter | Default |
|---|---|---|
| Value | required | 1 |
| From | choose from Nanotesla (nT), Microtesla (µT), Millitesla (mT), Tesla (T), Gauss (G) or Milligauss (mG) | Tesla (T) |
| To | choose from Nanotesla (nT), Microtesla (µT), Millitesla (mT), Tesla (T), Gauss (G) or Milligauss (mG) | Gauss (G) |
How does the Magnetic Field Converter work?
Both units are converted through magnetic flux density's base unit (T), so any of the 6 units in the dropdowns can be paired in either direction without loss of accuracy.
The constants come from the SI brochure and the 1959 international yard-and-pound agreement. For quantities defined empirically rather than by treaty, the current CODATA or IAU value is used instead.
Worked example
These are the values the Magnetic Field Converter loads by default, and the result it produces from them. Here is the calculation as it stands the moment the page loads.
| Value | 1 |
|---|---|
| From | Tesla (T) |
| To | Gauss (G) |
| Result | 10000 G |
|---|---|
| How it was calculated | 1 T = 10000 G, so 1 × 10000 = 10000 G |
| Reverse conversion | 0.0001 T (if you meant 1 G) |
Magnetic field strength
The tesla (T) is the SI unit of magnetic flux density, while the gauss (G) is the older CGS unit still common in some fields. 1 tesla equals exactly 10,000 gauss, a large factor that reflects just how much stronger engineered magnetic fields can be than natural ones.
Worth knowing
- Earth’s own magnetic field at the surface is remarkably weak by engineering standards, typically only about 25 to 65 microtesla (0.25 to 0.65 gauss) depending on location, yet it’s strong enough to reliably orient a compass needle.
- Medical MRI scanners typically operate at 1.5 to 3 tesla, tens of thousands of times stronger than Earth’s field, and specialised research magnets can reach even higher, which is exactly why MRI facilities enforce strict rules about metal objects near the scanner.
- The gauss remains common in some legacy scientific instruments, older textbooks, and certain industries (recording-media and some geophysics applications), even though tesla is the current SI-preferred unit.
Definitions: BIPM SI Brochure · NIST reference on units
How to use it
- Put Value.
- Pick a value for From: the options are Nanotesla (nT), Microtesla (µT), Millitesla (mT), Tesla (T), Gauss (G) or Milligauss (mG).
- Pick a value for To: the options are Nanotesla (nT), Microtesla (µT), Millitesla (mT), Tesla (T), Gauss (G) or Milligauss (mG).
- You will see the result move while you are still editing: that is expected.
- The results panel then shows Result, How it was calculated and Reverse conversion.
- Copy Link is the quickest way to send the exact scenario to someone else.
What this tool does not do
- Repeated conversions compound rounding, so convert once from the original value where possible.
- Factors use the internationally agreed definitions; some industries round them differently.
- The output is a number, not a judgement. Deciding what it means is still your job.
- Read the field labels once before trusting the answer; they specify the expected unit.
Frequently asked questions
You need Value, From and To. Nothing starts empty, meaning you can explore the calculation before committing to real figures.
With the values loaded when the page opens, result comes out as 10000 G. Any edit re-runs the calculation, so there is no stale number on screen.
Nothing leaves your machine. The only network traffic is loading the page itself.
Nothing at all. There is no registration, no paywall and no per-use quota.
The conversion is exact for the method described above. Where a value is rounded for display, the underlying figure keeps full precision.