Magnetic Unit Converter: Gauss to Tesla and More
Convert gauss to tesla, oersted to A/m, MGOe to kJ/m³, maxwell to weber, pounds-force to newtons, °F to °C and inches to millimeters.
Magnetic unit converter
Magnetic unit conversions at a glance
- 1 T = 10,000 Gtesla to gauss
- 1 G = 0.0001 T= 0.1 mT = 100 µT
- 1 mT = 10 Gmillitesla to gauss
- 1 kG = 0.1 T= 100 mT
- 1 Oe ≈ 79.58 A/mexactly 1,000 ÷ 4π
- 1 kOe ≈ 79.58 kA/mcoercivity (HcB, HcJ)
- 1 MGOe ≈ 7.958 kJ/m³energy product (BH)max
- 1 Wb = 108 Mx= 100,000,000 maxwells
- 1 lbf ≈ 4.448 N= 0.4536 kgf
- 1 kgf = 9.80665 Nexact; ≈ 2.205 lbf
- °C = (°F − 32) × 5/9176 °F = 80 °C
- 1 in = 25.4 mmexact
Gauss to tesla conversion
Gauss (G) and tesla (T) both measure magnetic flux density, B. The tesla is the SI unit; the gauss is the older CGS unit that most magnet datasheets and gaussmeters still use. 1 T = 10,000 G, so divide gauss by 10,000 to get tesla and multiply tesla by 10,000 to get gauss. 1 millitesla (mT) = 10 G, and 1 kilogauss (kG) = 0.1 T.
| Gauss (G) | Kilogauss (kG) | Tesla (T) | Millitesla (mT) |
|---|---|---|---|
| 1 | 0.001 | 0.0001 | 0.1 |
| 10 | 0.01 | 0.001 | 1 |
| 50 | 0.05 | 0.005 | 5 |
| 100 | 0.1 | 0.01 | 10 |
| 500 | 0.5 | 0.05 | 50 |
| 1,000 | 1 | 0.1 | 100 |
| 2,000 | 2 | 0.2 | 200 |
| 3,000 | 3 | 0.3 | 300 |
| 4,000 | 4 | 0.4 | 400 |
| 5,000 | 5 | 0.5 | 500 |
| 10,000 | 10 | 1 | 1,000 |
| 12,000 | 12 | 1.2 | 1,200 |
| 14,000 | 14 | 1.4 | 1,400 |
| 15,000 | 15 | 1.5 | 1,500 |
| 20,000 | 20 | 2 | 2,000 |
| Tesla (T) | Millitesla (mT) | Gauss (G) | Kilogauss (kG) |
|---|---|---|---|
| 0.001 | 1 | 10 | 0.01 |
| 0.01 | 10 | 100 | 0.1 |
| 0.05 | 50 | 500 | 0.5 |
| 0.1 | 100 | 1,000 | 1 |
| 0.2 | 200 | 2,000 | 2 |
| 0.3 | 300 | 3,000 | 3 |
| 0.4 | 400 | 4,000 | 4 |
| 0.5 | 500 | 5,000 | 5 |
| 1 | 1,000 | 10,000 | 10 |
| 1.2 | 1,200 | 12,000 | 12 |
| 1.4 | 1,400 | 14,000 | 14 |
| 1.5 | 1,500 | 15,000 | 15 |
| 2 | 2,000 | 20,000 | 20 |
| 3 | 3,000 | 30,000 | 30 |
Weak fields, such as Earth's field or readings from an EMF meter, are usually given in microtesla or milligauss. 1 µT = 10 mG.
| Microtesla (µT) | Milligauss (mG) | Gauss (G) |
|---|---|---|
| 0.1 | 1 | 0.001 |
| 0.2 | 2 | 0.002 |
| 0.5 | 5 | 0.005 |
| 1 | 10 | 0.01 |
| 2 | 20 | 0.02 |
| 5 | 50 | 0.05 |
| 10 | 100 | 0.1 |
| 25 | 250 | 0.25 |
| 50 | 500 | 0.5 |
| 65 | 650 | 0.65 |
| 100 | 1,000 | 1 |
How strong is a gauss or a tesla?
| Field source | Gauss | Tesla |
|---|---|---|
| Earth's magnetic field at the surface | 0.25–0.65 G | 25–65 µT |
| Refrigerator magnet | 10–100 G | 1–10 mT |
| Surface field of Apex neodymium magnets (product pages) | about 500–8,500 G | 0.05–0.85 T |
| Br of N52 neodymium material | 14,200–14,700 G | 1.42–1.47 T |
| Clinical MRI scanner | 15,000–30,000 G | 1.5–3 T |
Surface gauss depends on a magnet's size and shape and is always well below the material's Br. To measure a field yourself, see our pole finders and gauss meters.
Oersted to A/m (field strength and coercivity)
Oersted (Oe) and ampere per meter (A/m) measure magnetic field strength, H. Magnet datasheets use them for coercivity: HcB (normal coercivity) and HcJ (intrinsic coercivity), usually in kOe or kA/m. 1 Oe = 1,000 ÷ 4π A/m ≈ 79.577 A/m, so 1 kOe ≈ 79.58 kA/m.
| Oersted (Oe) | Kilooersted (kOe) | A/m | kA/m |
|---|---|---|---|
| 1 | 0.001 | 79.58 | 0.07958 |
| 10 | 0.01 | 795.8 | 0.7958 |
| 100 | 0.1 | 7,958 | 7.958 |
| 500 | 0.5 | 39,789 | 39.79 |
| 1,000 | 1 | 79,577 | 79.58 |
| 2,000 | 2 | 159,155 | 159.2 |
| 3,000 | 3 | 238,732 | 238.7 |
| 5,000 | 5 | 397,887 | 397.9 |
| 8,000 | 8 | 636,620 | 636.6 |
| 10,000 | 10 | 795,775 | 795.8 |
| 12,000 | 12 | 954,930 | 954.9 |
| 14,000 | 14 | 1,114,085 | 1,114 |
| 15,000 | 15 | 1,193,662 | 1,194 |
| 17,000 | 17 | 1,352,817 | 1,353 |
| 20,000 | 20 | 1,591,549 | 1,592 |
| 25,000 | 25 | 1,989,437 | 1,989 |
| 30,000 | 30 | 2,387,324 | 2,387 |
In air, a field strength of 1 Oe produces a flux density of 1 G, which is why gauss and oersted are sometimes used interchangeably. Inside a magnet or in steel they are different quantities.
Neodymium grades N35 to N55 in SI and CGS units
Remanence (Br), intrinsic coercivity (HcJ) and maximum energy product ((BH)max) for standard sintered neodymium grades, in both unit systems.
| Grade | Br (kG) | Br (T) | HcJ min (kOe) | HcJ min (kA/m) | (BH)max (MGOe) | (BH)max (kJ/m³) |
|---|---|---|---|---|---|---|
| N35 | 11.7–12.2 | 1.17–1.22 | ≥ 12 | ≥ 955 | 33–36 | 263–286 |
| N38 | 12.2–12.6 | 1.22–1.26 | ≥ 12 | ≥ 955 | 36–39 | 286–310 |
| N40 | 12.5–12.9 | 1.25–1.29 | ≥ 12 | ≥ 955 | 38–41 | 302–326 |
| N42 | 12.8–13.2 | 1.28–1.32 | ≥ 12 | ≥ 955 | 40–43 | 318–342 |
| N45 | 13.2–13.7 | 1.32–1.37 | ≥ 12 | ≥ 955 | 43–46 | 342–366 |
| N48 | 13.7–14.2 | 1.37–1.42 | ≥ 12 | ≥ 955 | 46–49 | 366–390 |
| N50 | 13.9–14.4 | 1.39–1.44 | ≥ 12 | ≥ 955 | 47–51 | 374–406 |
| N52 | 14.2–14.7 | 1.42–1.47 | ≥ 11 | ≥ 875 | 49–53 | 390–422 |
| N55 | 14.6–15.2 | 1.46–1.52 | ≥ 11 | ≥ 875 | 52–56 | 414–446 |
CGS values match our N-grade comparison. SI values here are exact conversions of the CGS figures, rounded, so a supplier datasheet may show an SI value 1 higher or lower. HcJ values are minimums.
MGOe to kJ/m³ (energy product)
Maximum energy product, (BH)max, is the main measure of a magnet material's strength. It is given in megagauss-oersteds (MGOe) or kilojoules per cubic meter (kJ/m³). 1 MGOe = 100 ÷ 4π kJ/m³ ≈ 7.958 kJ/m³. The number in a neodymium grade name is its nominal (BH)max in MGOe: N52 is about 52 MGOe, or about 414 kJ/m³.
| (BH)max (MGOe) | (BH)max (kJ/m³) | Typical material |
|---|---|---|
| 1 | 7.958 | |
| 3.5 | 27.85 | Ceramic C-8 (minimum) |
| 4.32 | 34.38 | Ceramic C-11 (minimum) |
| 5.5 | 43.77 | AlNiCo 5 |
| 10 | 79.58 | |
| 20 | 159.2 | |
| 30 | 238.7 | SmCo 30 |
| 35 | 278.5 | N35 (nominal) |
| 38 | 302.4 | N38 (nominal) |
| 40 | 318.3 | N40 (nominal) |
| 42 | 334.2 | N42 (nominal) |
| 45 | 358.1 | N45 (nominal) |
| 48 | 382 | N48 (nominal) |
| 50 | 397.9 | N50 (nominal) |
| 52 | 413.8 | N52 (nominal) |
| 55 | 437.7 | N55 (nominal) |
Maxwell to weber (magnetic flux)
Magnetic flux (Φ) is flux density multiplied by area. Its SI unit is the weber (Wb), equal to 1 T·m². Its CGS unit is the maxwell (Mx), equal to 1 G·cm². 1 Wb = 108 Mx, so 1 Mx = 10−8 Wb = 0.01 µWb.
| Maxwell (Mx) | Microweber (µWb) | Weber (Wb) |
|---|---|---|
| 1 | 0.01 | 1 × 10−8 |
| 100 | 1 | 1 × 10−6 |
| 1,000 | 10 | 1 × 10−5 |
| 10,000 | 100 | 1 × 10−4 |
| 100,000 | 1,000 | 0.001 |
| 1,000,000 | 10,000 | 0.01 |
| 1 × 108 | 1,000,000 | 1 |
Flux (Wb, Mx) is not the same as flux density (T, G). Flux density is flux per unit area.
Pounds-force to newtons and kilograms-force
Apex product pages rate pull force in pounds (lbf). 1 lbf ≈ 4.448 N ≈ 0.4536 kgf, and 1 kgf = 9.80665 N exactly. The Magnet Pull Force Calculator shows results in lb, kgf and N.
| Pounds-force (lbf) | Newtons (N) | Kilograms-force (kgf) |
|---|---|---|
| 0.25 | 1.112 | 0.1134 |
| 0.5 | 2.224 | 0.2268 |
| 1 | 4.448 | 0.4536 |
| 2 | 8.896 | 0.9072 |
| 5 | 22.24 | 2.268 |
| 10 | 44.48 | 4.536 |
| 20 | 88.96 | 9.072 |
| 25 | 111.2 | 11.34 |
| 50 | 222.4 | 22.68 |
| 100 | 444.8 | 45.36 |
| 200 | 889.6 | 90.72 |
| 500 | 2,224 | 226.8 |
Fahrenheit to Celsius for magnet temperatures
Apex product pages list maximum operating temperature in °F; grade specifications use °C. °C = (°F − 32) × 5/9 and °F = °C × 9/5 + 32. For example, 176 °F = 80 °C, the limit for standard N grades.
| °C | °F | Reference point |
|---|---|---|
| −40 | −40 | |
| 0 | 32 | Water freezes |
| 20 | 68 | Room temperature |
| 80 | 176 | Standard N grades (N35–N55) max operating |
| 100 | 212 | M grades max operating; water boils |
| 120 | 248 | H grades max operating (N35H, N45H) |
| 150 | 302 | SH grades max operating |
| 200 | 392 | UH / EH grades max operating |
| 250 | 482 | Ceramic max operating (Apex rating) |
| 300 | 572 | SmCo30 max operating |
| 320 | 608 | N-grade neodymium Curie temperature |
| 350 | 662 | Upper SmCo max operating |
| 550 | 1,022 | Upper AlNiCo max operating |
Maximum operating temperatures are typical values for standard grades; the safe limit for a specific magnet also depends on its shape. See grade specifications for details.
Inches to millimeters, including fractions
Apex sells both inch and metric sizes. 1 in = 25.4 mm exactly. The converter above accepts fractions such as 3/16 or 1-1/2, and shows the nearest 1/64 in when converting from mm.
| Fraction (in) | Decimal (in) | Millimeters (mm) |
|---|---|---|
| 1/64 in | 0.015625 | 0.397 |
| 1/32 in | 0.03125 | 0.794 |
| 3/64 in | 0.046875 | 1.191 |
| 1/16 in | 0.0625 | 1.588 |
| 3/32 in | 0.09375 | 2.381 |
| 1/8 in | 0.125 | 3.175 |
| 5/32 in | 0.15625 | 3.969 |
| 3/16 in | 0.1875 | 4.763 |
| 7/32 in | 0.21875 | 5.556 |
| 1/4 in | 0.25 | 6.35 |
| 5/16 in | 0.3125 | 7.938 |
| 3/8 in | 0.375 | 9.525 |
| 7/16 in | 0.4375 | 11.113 |
| 1/2 in | 0.5 | 12.7 |
| 9/16 in | 0.5625 | 14.288 |
| 5/8 in | 0.625 | 15.875 |
| 11/16 in | 0.6875 | 17.463 |
| 3/4 in | 0.75 | 19.05 |
| 13/16 in | 0.8125 | 20.638 |
| 7/8 in | 0.875 | 22.225 |
| 15/16 in | 0.9375 | 23.813 |
| 1 in | 1 | 25.4 |
| 1-1/8 in | 1.125 | 28.575 |
| 1-1/4 in | 1.25 | 31.75 |
| 1-1/2 in | 1.5 | 38.1 |
| 1-3/4 in | 1.75 | 44.45 |
| 2 in | 2 | 50.8 |
| 3 in | 3 | 76.2 |
| 4 in | 4 | 101.6 |
| Millimeters (mm) | Inches (decimal) | Nearest 1/64 in |
|---|---|---|
| 1 | 0.039 | ≈ 3/64 in |
| 1.5 | 0.059 | ≈ 1/16 in |
| 2 | 0.079 | ≈ 5/64 in |
| 3 | 0.118 | ≈ 1/8 in |
| 4 | 0.157 | ≈ 5/32 in |
| 5 | 0.197 | ≈ 13/64 in |
| 6 | 0.236 | ≈ 15/64 in |
| 8 | 0.315 | ≈ 5/16 in |
| 10 | 0.394 | ≈ 25/64 in |
| 12 | 0.472 | ≈ 15/32 in |
| 15 | 0.591 | ≈ 19/32 in |
| 20 | 0.787 | ≈ 25/32 in |
| 25 | 0.984 | ≈ 63/64 in |
| 30 | 1.181 | ≈ 1-3/16 in |
| 40 | 1.575 | ≈ 1-37/64 in |
| 50 | 1.969 | ≈ 1-31/32 in |
Browse every stocked size in the size grid.
Magnetic units explained: SI vs. CGS
Magnet specifications use two unit systems. SI units (tesla, A/m, kJ/m³, weber) are the international standard. CGS units (gauss, oersted, MGOe, maxwell) are older but still common on magnet datasheets, gaussmeters and product listings, including ours.
| Quantity | Symbol | SI unit | CGS unit | Conversion |
|---|---|---|---|---|
| Magnetic flux density | B, Br | tesla (T) | gauss (G) | 1 T = 10,000 G |
| Magnetic field strength | H, HcB, HcJ | ampere per meter (A/m) | oersted (Oe) | 1 Oe ≈ 79.577 A/m |
| Maximum energy product | (BH)max | kilojoule per cubic meter (kJ/m³) | megagauss-oersted (MGOe) | 1 MGOe ≈ 7.958 kJ/m³ |
| Magnetic flux | Φ | weber (Wb) | maxwell (Mx) | 1 Wb = 108 Mx |
- Br (remanence)
- The flux density a magnet material keeps after it is magnetized, measured in a closed magnetic circuit. Given in kG or T.
- HcB (normal coercivity)
- The reverse field strength that brings the material's flux density to zero. Given in kOe or kA/m.
- HcJ (intrinsic coercivity)
- The reverse field strength that removes the material's magnetization. A higher HcJ means better resistance to demagnetization and heat. Given in kOe or kA/m.
- (BH)max (maximum energy product)
- The highest product of B and H on the material's demagnetization curve. Given in MGOe or kJ/m³.
- Surface gauss
- The field measured at a finished magnet's face with a gaussmeter. It depends on size and shape and is always lower than Br.
Frequently asked questions
What is the unit of magnetic field?
The SI unit of magnetic flux density (B), the quantity usually called the magnetic field and the one a gaussmeter reads, is the tesla (T). Its CGS unit is the gauss (G), and 1 T = 10,000 G. Magnetic field strength (H) is measured in amperes per meter (A/m) in SI units or oersteds (Oe) in CGS units, where 1 Oe ≈ 79.58 A/m.
What does a tesla measure?
The tesla (T) is the SI unit of magnetic flux density, B, which describes how strong a magnetic field is at a given point. 1 T equals 1 weber per square meter (Wb/m²) and 10,000 gauss. Weaker fields are usually given in millitesla (mT) or microtesla (µT).
How many gauss are in a tesla?
1 tesla (T) = 10,000 gauss (G). Going the other way, 1 gauss = 0.0001 T, or 0.1 millitesla (mT).
How do you convert gauss to tesla?
Divide gauss by 10,000. For example, 5,000 G ÷ 10,000 = 0.5 T. To convert tesla to gauss, multiply by 10,000: 1.2 T × 10,000 = 12,000 G.
How many gauss is 1 millitesla?
1 millitesla (mT) = 10 gauss. 1 microtesla (µT) = 0.01 gauss, or 10 milligauss (mG).
How do you convert oersted to A/m?
Multiply oersteds by 1,000 ÷ 4π, about 79.577. So 1 Oe ≈ 79.58 A/m and 1 kOe ≈ 79.58 kA/m. A coercivity of 12 kOe is about 955 kA/m.
How do you convert MGOe to kJ/m³?
Multiply MGOe by 100 ÷ 4π, about 7.958. An N52 magnet's nominal 52 MGOe is about 414 kJ/m³, and N35's 35 MGOe is about 279 kJ/m³.
Is gauss the same as oersted?
No. Gauss measures magnetic flux density (B) and oersted measures magnetic field strength (H). In air, a field strength of 1 Oe gives a flux density of 1 G, so the numbers match there. Inside a magnet or in steel they differ, which is why datasheets give Br in gauss and coercivity in oersteds.
What unit is magnetic flux measured in?
Magnetic flux (Φ) is measured in webers (Wb) in SI units and maxwells (Mx) in CGS units, where 1 Wb = 100,000,000 Mx. Gauss and tesla are not flux units: they measure flux density, which is flux per unit area.
How many maxwells are in a weber?
1 weber (Wb) = 100,000,000 maxwells (Mx). 1 Wb equals 1 T·m² and 1 Mx equals 1 G·cm², because magnetic flux is flux density multiplied by area.
Is Br the same as a magnet's surface gauss?
No. Br (remanence) is a property of the magnet material, measured in a closed magnetic circuit. Surface gauss is the field measured at a finished magnet's face in open air, so it depends on size and shape and is always much lower. An Apex 1/2 × 1/8 in N48 disc has a Br of 13,700–14,200 G but a surface field of 3,402 G.
How strong is 1 tesla?
1 tesla is 10,000 gauss: about 20,000 times Earth's magnetic field at the surface (roughly 0.5 G) and 100 to 1,000 times a refrigerator magnet (10–100 G). Clinical MRI scanners commonly run at 1.5 T or 3 T.
Which units do Apex product pages use?
Apex product pages list pull force in pounds, surface field in gauss, Br in kG and T, and maximum operating temperature in °F, with sizes in inches or millimeters. Use this converter for newtons, kilograms-force, millitesla, °C or mm, and the N-grade comparison for HcJ and (BH)max in both unit systems.