Last updated October 6, 2026 · Report an error
Magnetic flux density (also called magnetic field strength) is measured in Tesla in the SI system, but Gauss remains common in older references, permanent magnet specifications, and some scientific fields. This calculator converts between Tesla, Gauss, and their common sub-units.
The two systems differ by a factor of 10,000 — 1 Tesla equals 10,000 Gauss — which makes mental conversion error-prone when specs are mixed across sources.
How it works
Enter a value, choose the unit you're converting from and to, and the calculator applies the standard conversion factor between Tesla, Gauss, millitesla, and microtesla.
- Enter value.
- Enter from.
- Enter to.
- Click Calculate to see your results.
Examples
A permanent magnet spec sheet
A magnet rated at 5,000 Gauss converts to 0.5 Tesla, a scale more commonly used in SI-based engineering specifications.
Earth's magnetic field
Earth's magnetic field, roughly 0.5 Gauss, converts to about 50 microtesla — useful when comparing to sensor datasheets specified in tesla-based units.
Who should use it
- Converting a permanent magnet's Gauss rating to Tesla for engineering specs.
- Comparing magnetic field sensor readings across datasheets using different unit systems.
Industry applications
- Electrical and magnetic engineering
- Physics and geophysics research
Advantages
- Covers both SI (Tesla) and CGS (Gauss) systems plus common sub-units.
- Shows the exact conversion factor used, not just the final answer.
- No account, subscription or watermark.
Limitations
- Purely a unit conversion — does not calculate magnetic field strength from current or distance.
Common mistakes to avoid
- Confusing Tesla and Gauss directly without applying the 10,000x conversion factor.
- Mixing millitesla and microtesla, which differ by a factor of 1,000.
Best practices
- Double-check which unit a datasheet or spec actually uses before comparing values.
- Use microtesla or millitesla for small field measurements like Earth's magnetic field, since Tesla itself is a very large unit for everyday fields.
Tips
- Remember the simple 10,000x factor between Tesla and Gauss for quick mental estimates.
- Use the sub-unit (milli/micro) that keeps your numbers in a reasonable range rather than very large or very small values.