{
  "url": "https://openlegislation.uk/weights-regulations-1986/schedule-4",
  "json_url": "https://openlegislation.uk/weights-regulations-1986/schedule-4.json",
  "legislation": "uksi/1986/1683",
  "legislation_title": "The Weights Regulations 1986",
  "legislation_url": "https://openlegislation.uk/weights-regulations-1986",
  "path": "schedule/4",
  "kind": "schedule",
  "number": "4",
  "heading": "PRESCRIBED LIMITS OF ERROR",
  "text": "TABLE 1\nMetric except carat (metric) weights of not less than 50 mg\n1.\n2.\n3.\nPurported mass of the weight\nPrescribed limits of error on passing as fit for use for trade (+ only)\nPrescribed limits of error in relation to the obliteration of the stamp (±)\n25 kg\n4000 mg\n4000 mg\n20 kg\n3200 mg\n3200 mg\n10 kg\n1600 mg\n1600 mg\n5 kg\n800 mg\n800 mg\n2 kg\n400 mg\n400 mg\n1 kg\n200 mg\n200 mg\n500 g\n100 mg\n100 mg\n200 g\n50 mg\n50 mg\n100 g\n30 mg\n30 mg\n50 g\n30 mg\n30 mg\n20 g\n20 mg\n20 mg\n15 g\n20 mg\n20 mg\n10 g\n20 mg\n20 mg\n5 g\n10 mg\n10 mg\n4 g\n10 mg\n10 mg\n3 g\n5 mg\n5 mg\n2 g\n5 mg\n5 mg\n1 g\n5 mg\n5 mg\n500 mg\n2.5 mg\n2.5 mg\n400 mg\n2.5 mg\n2.5 mg\n300 mg\n2 mg\n2 mg\n200 mg\n2 mg\n2 mg\n150 mg\n2 mg\n2 mg\n100 mg\n1.5 mg\n1.5 mg\n50 mg\n1.2 mg\n1.2 mg\nTABLE 2\nMetric except carat (metric) weights of not more than 20 mg\n1.\n2.\n3.\nPurported mass of the weight\nPrescribed limits of error on passing as fit for use for trade (±)\nPrescribed limits of error in relation to the obliteration of the stamp (±)\n20 mg\n0.3 mg\n0.6 mg\n10 mg\n0.25 mg\n0.5 mg\n5 mg\n0.2 mg\n0.4 mg\n2 mg\n0.2 mg\n0.4 mg\n1 mg\n0.2 mg\n0.4 mg\nTABLE 3\nCarat (metric) weights\n1.\n2.\n3.\nPurported mass of the weight\nPrescribed limits of error on passing as fit for use for trade (±)\nPrescribed limits of error in relation to the obliteration of the stamp (±)\n500 C.M.\n5.0 mg\n10.0 mg\n200 C.M.\n3.0 mg\n6.0 mg\n100 C.M.\n2.5 mg\n5.0 mg\n50 C.M.\n2.0 mg\n4.0 mg\n20 C.M.\n1.5 mg\n3.0 mg\n10 C.M.\n1.2 mg\n2.4 mg\n5 C.M.\n1.0 mg\n2.0 mg\n2 C.M.\n0.7 mg\n1.4 mg\n1 C.M.\n0.6 mg\n1.2 mg\n0.5 C.M.\n0.5 mg\n1.0 mg\n0.25 C.M.\n0.4 mg\n0.8 mg\n0.2 C.M.\n0.4 mg\n0.8 mg\n0.1 C.M.\n0.3 mg\n0.6 mg\n0.05 C.M.\n0.2 mg\n0.4 mg\n0.02 C.M.\n0.2 mg\n0.4 mg\n0.01 C.M.\n0.2 mg\n0.4 mg\nTABLE 4\nAvoirdupois weights\n1.\n2.\n3.\nPurported mass of the weight\nPrescribed limits of error on passing as fit for use for trade (+ only)\nPrescribed limits of error in relation to the obliteration of the stamp (±)\n56 lb\n4000 mg\n4000 mg\n50 lb\n3600 mg\n3600 mg\n28 lb\n2000 mg\n2000 mg\n20 lb\n1500 mg\n1500 mg\n14 lb\n1000 mg\n1000 mg\n10 lb\n750 mg\n750 mg\n7 lb\n560 mg\n560 mg\n5 lb\n450 mg\n450 mg\n4 lb\n360 mg\n360 mg\n2 lb\n180 mg\n180 mg\n1 lb\n100 mg\n100 mg\n8 oz\n60 mg\n60 mg\n4 oz\n35 mg\n35 mg\n2 oz\n30 mg\n30 mg\n1 oz\n25 mg\n25 mg\n1/2 oz\n20 mg\n20 mg\n1/4 oz\n15 mg\n15 mg\n1/8 oz\n10 mg\n10 mg\n1/16 oz\n5 mg\n5 mg\n1/32 oz\n5 mg\n5 mg\nTABLE 5\nWeights expressed as multiples or fractions of 1/7000 lb\n1.\n2.\n3.\nPurported mass of the weight\nPrescribed limits of error on passing as fit for use for trade (±)\nPrescribed limits of error in relation to the obliteration of the stamp (±)\n100\n1.65 mg\n3.30 mg\n50\n1.32 mg\n2.64 mg\n30\n1.20 mg\n2.40 mg\n20\n1.06 mg\n2.12 mg\n10\n0.86 mg\n1.72 mg\n5\n0.68 mg\n1.36 mg\n3\n0.60 mg\n1.20 mg\n2\n0.53 mg\n1.06 mg\n1\n0.43 mg\n0.86 mg\n0.5\n0.34 mg\n0.68 mg\n0.3\n0.30 mg\n0.60 mg\n0.2\n0.27 mg\n0.54 mg\n0.1\n0.21 mg\n0.42 mg\n0.05\n0.20 mg\n0.40 mg\n0.03\n0.20 mg\n0.40 mg\n0.02\n0.20 mg\n0.40 mg\n0.01\n0.20 mg\n0.40 mg\nTABLE 6\nOunce troy weights\n1.\n2.\n3.\nPurported mass of the weight\nPrescribed limits of error on passing as fit for use for trade (±)\nPrescribed limits of error in relation to the obliteration of the stamp (±)\n500 oz tr\n780 mg\n1560 mg\n400 oz tr\n620 mg\n1240 mg\n300 oz tr\n465 mg\n930 mg\n200 oz tr\n310 mg\n620 mg\n100 oz tr\n155 mg\n310 mg\n50 oz tr\n80 mg\n160 mg\n40 oz tr\n60 mg\n120 mg\n30 oz tr\n50 mg\n100 mg\n20 oz tr\n30 mg\n60 mg\n10 oz tr\n15 mg\n30 mg\n5 oz tr\n8 mg\n16 mg\n4 oz tr\n6 mg\n12 mg\n3 oz tr\n5 mg\n10 mg\n2 oz tr\n3.5 mg\n7 mg\n1 oz tr\n2.7 mg\n5.4 mg\n0.5 oz tr\n2.3 mg\n4.6 mg\n0.4 oz tr\n2.1 mg\n4.2 mg\n0.3 oz tr\n1.9 mg\n3.8 mg\n0.2 oz tr\n1.6 mg\n3.2 mg\n0.1 oz tr\n1.3 mg\n2.6 mg\n0.05 oz tr\n1.1 mg\n2.2 mg\n0.04 oz tr\n1.0 mg\n2.0 mg\n0.03 oz tr\n1.0 mg\n2.0 mg\n0.025 oz tr\n0.9 mg\n1.8 mg\n0.02 oz tr\n0.8 mg\n1.6 mg\n0.01 oz tr\n0.7 mg\n1.4 mg\n0.005 oz tr\n0.6 mg\n1.2 mg\n0.004 oz tr\n0.5 mg\n1.0 mg\n0.003 oz tr\n0.5 mg\n1.0 mg\n0.002 oz tr\n0.4 mg\n0.8 mg\n0.001 oz tr\n0.3 mg\n0.6 mg",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [
    {
      "type": "substituted",
      "affecting": "uksi/1994/1851",
      "affecting_title": "The Weights and Measures (Metrication Amendments) Regulations 1994"
    },
    {
      "type": "words substituted",
      "affecting": "uksi/1994/1851",
      "affecting_title": "The Weights and Measures (Metrication Amendments) Regulations 1994"
    }
  ],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/uksi/1986/1683/schedule/4",
    "retrieved_at": "2026-10-29T16:40:43.032146+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}