{
  "id": "questions:how-do-i-convert-mg-to-microtesla",
  "collection": "questions",
  "slug": "how-do-i-convert-mg-to-microtesla",
  "name": "How do you convert mG to µT and µW/m² to V/m?",
  "summary": "1 µT = 10 mG exactly; S = E²/377 in the far field, so 6 V/m ≈ 95,500 µW/m². Neither applies in the near field.",
  "status": "verified",
  "lastVerified": "2026-08-12",
  "data": {
    "question": "How do I convert between EMF units?",
    "answer": "For magnetic fields the conversion is exact: 1 µT = 10 mG, so 0.4 µT = 4 mG. For radiofrequency in the far field, power density and electric field strength are linked by the impedance of free space: S (W/m²) = E² / 377, and E (V/m) = √(S × 377) — so 6 V/m is about 95,500 µW/m², and 1 V/m is about 2,653 µW/m². Note that this RF relationship holds only in the far field, roughly beyond one wavelength from the source, and never for near-field exposure such as a phone against the head, which is assessed as SAR instead.",
    "cluster": "measurement",
    "aliases": [
      "mG to µT",
      "V/m to µW/m²",
      "EMF unit conversion"
    ],
    "related": [
      "quantities:power-density",
      "quantities:magnetic-flux-density",
      "glossary:far-field"
    ]
  },
  "sources": [
    {
      "id": "nist-si",
      "title": "The International System of Units (SI), NIST Special Publication 330",
      "publisher": "National Institute of Standards and Technology",
      "url": "https://www.nist.gov/pml/special-publication-330",
      "kind": "government",
      "retrieved": "2026-08-12"
    },
    {
      "id": "itu-fs-relations",
      "title": "Free-space path loss and power density relations (ITU-R P.525)",
      "publisher": "International Telecommunication Union",
      "url": "https://www.itu.int/rec/R-REC-P.525/en",
      "kind": "standard",
      "retrieved": "2026-08-12"
    }
  ],
  "links": {
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