{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "meta": {
    "title": "Kitchen Knife Facts & Statistics",
    "description": "Machine-readable reference compendium on kitchen knife safety, injury data, sharpening frequency, and edge geometry. All facts cite primary or peer-reviewed sources.",
    "url": "https://seriouslyfastsharpening.com/kitchen-knife-facts",
    "publisher": {
      "name": "Seriously Fast Sharpening",
      "url": "https://seriouslyfastsharpening.com",
      "expert": "Michael Kempf"
    },
    "license": "Public facts may be reused with attribution to the cited primary source. Editorial framing is CC BY 4.0.",
    "lastReviewed": "2026-04-20",
    "version": "1.0.0"
  },
  "topFacts": [
    {
      "id": "er-injuries-annual",
      "claim": "Roughly 350,000 knife-related injuries are treated in US emergency departments every year.",
      "value": 350000,
      "unit": "injuries/year",
      "source": {
        "citation": "Consumer Product Safety Commission / Consumer Reports",
        "url": "https://www.consumerreports.org/cro/news/2014/10/7-scariest-kitchen-accidents/index.htm"
      }
    },
    {
      "id": "er-injuries-daily",
      "claim": "Approximately 1,190 knife injuries are treated in US emergency departments every day.",
      "value": 1190,
      "unit": "injuries/day",
      "source": {
        "citation": "Smith, G.A. (2013). Journal of Emergency Medicine, 45(3), 315-323",
        "url": "https://www.sciencedirect.com/science/article/abs/pii/S0736467912016241"
      }
    },
    {
      "id": "finger-thumb-share",
      "claim": "66% of knife injuries strike fingers or thumbs.",
      "value": 66,
      "unit": "%",
      "source": {
        "citation": "Smith, G.A. (2013). Journal of Emergency Medicine",
        "url": "https://www.sciencedirect.com/science/article/abs/pii/S0736467912016241"
      }
    },
    {
      "id": "laceration-share",
      "claim": "94% of knife injuries are lacerations.",
      "value": 94,
      "unit": "%",
      "source": {
        "citation": "CPSC NEISS database analysis",
        "url": "https://www.cpsc.gov/Research--Statistics/NEISS-Injury-Data"
      }
    },
    {
      "id": "dull-knife-paradox",
      "claim": "Dull knives cause more kitchen accidents than sharp ones because they require more force, which increases slippage.",
      "sources": [
        {
          "citation": "Wüsthof",
          "url": "https://wusthof.com/blogs/the-chefs-table/how-to-sharpen-your-wuesthof-knives"
        },
        {
          "citation": "University of Rochester Medical Center",
          "url": "https://www.urmc.rochester.edu/encyclopedia/Content?ContentTypeID=1&ContentID=263"
        },
        {
          "citation": "Consumer Reports",
          "url": "https://www.consumerreports.org/cro/news/2014/10/7-scariest-kitchen-accidents/index.htm"
        }
      ]
    },
    {
      "id": "home-cook-cadence",
      "claim": "Most home cooks should have kitchen knives professionally sharpened every 6 months.",
      "sources": [
        {
          "citation": "Wüsthof",
          "url": "https://wusthof.com/blogs/the-chefs-table/how-to-sharpen-your-wuesthof-knives"
        },
        {
          "citation": "America's Test Kitchen",
          "url": "https://www.americastestkitchen.com/articles/5519-how-often-should-you-sharpen-your-knife-just-use-your-onion"
        }
      ]
    },
    {
      "id": "honing-vs-sharpening",
      "claim": "Honing realigns the existing edge without removing metal; sharpening removes metal to create a new edge.",
      "sources": [
        {
          "citation": "Wüsthof",
          "url": "https://wusthof.com/blogs/the-chefs-table/how-to-sharpen-your-wuesthof-knives"
        },
        {
          "citation": "Made In Cookware",
          "url": "https://madeincookware.com/blogs/knives/honing-vs-sharpening"
        }
      ]
    },
    {
      "id": "pro-vs-home-frequency",
      "claim": "Professional chefs often sharpen weekly or daily; home cooks twice a year is typical.",
      "source": {
        "citation": "America's Test Kitchen",
        "url": "https://www.americastestkitchen.com/articles/5519-how-often-should-you-sharpen-your-knife-just-use-your-onion"
      }
    },
    {
      "id": "edge-angle-ranges",
      "claim": "German-style kitchen knives typically use a 14–20° edge angle per side; Japanese knives 10–15° per side.",
      "source": {
        "citation": "Wüsthof",
        "url": "https://wusthof.com/blogs/the-chefs-table/how-to-sharpen-your-wuesthof-knives"
      }
    },
    {
      "id": "hand-wrist-share",
      "claim": "Knives account for approximately 11% of all hand and wrist injuries treated in US emergency departments.",
      "value": 11,
      "unit": "%",
      "source": {
        "citation": "Aceto, Shaylor & Zumsteg (2025). HAND Journal",
        "url": "https://journals.sagepub.com/doi/10.1177/15589447251392939"
      }
    }
  ],
  "sharpeningFrequency": {
    "description": "Recommended professional-sharpening cadence and honing frequency by user type.",
    "rows": [
      {
        "userType": "Home cook (weekly use)",
        "sharpening": "Twice yearly (every 6 months)",
        "honing": "1–2 times per week",
        "sources": ["Wüsthof", "America's Test Kitchen"]
      },
      {
        "userType": "Home cook (daily, heavy prep)",
        "sharpening": "Every 3 months",
        "honing": "Before each use",
        "sources": ["Wüsthof", "America's Test Kitchen"]
      },
      {
        "userType": "Professional chef",
        "sharpening": "Weekly to daily",
        "honing": "Before each use",
        "sources": ["America's Test Kitchen", "Serious Eats"]
      },
      {
        "userType": "Butcher / high-volume prep",
        "sharpening": "Daily",
        "honing": "Multiple times per shift",
        "sources": ["Industry standard"]
      }
    ]
  },
  "edgeGeometry": {
    "description": "Typical edge angle ranges by knife style and origin.",
    "rows": [
      {
        "knifeStyle": "German / European chef knife",
        "anglePerSide": "14–20°",
        "totalAngle": "28–40°",
        "notes": "Tougher edge, more forgiving with bones and dense vegetables.",
        "source": "Wüsthof"
      },
      {
        "knifeStyle": "Japanese gyuto / santoku (double-bevel)",
        "anglePerSide": "10–15°",
        "totalAngle": "20–30°",
        "notes": "Sharper, more precise, but more fragile on hard foods.",
        "source": "Wüsthof / Shun"
      },
      {
        "knifeStyle": "Japanese yanagiba (single-bevel)",
        "anglePerSide": "Single-bevel, ~10°",
        "totalAngle": "~10°",
        "notes": "Sushi / sashimi. Maximum sharpness, requires specialized sharpening.",
        "source": "Shun"
      },
      {
        "knifeStyle": "Cleaver / butcher knife",
        "anglePerSide": "22–30°",
        "totalAngle": "44–60°",
        "notes": "Durable edge for chopping through bone.",
        "source": "Industry standard"
      }
    ]
  },
  "sharpnessTests": [
    {
      "name": "Paper test",
      "method": "Hold a sheet of printer paper by one edge and slice down through it with the blade.",
      "passCriterion": "Clean, whisper-quiet slice from heel to tip.",
      "failCriterion": "Blade tears, catches, or requires sawing.",
      "source": "America's Test Kitchen"
    },
    {
      "name": "Tomato test",
      "method": "Slice a ripe tomato with the blade's own weight, without pressure.",
      "passCriterion": "Blade bites the skin immediately and falls through.",
      "failCriterion": "Blade skates across the skin or crushes the tomato.",
      "source": "Wüsthof"
    },
    {
      "name": "Onion test",
      "method": "Dice a yellow onion normally.",
      "passCriterion": "Clean cuts, minimal tearing.",
      "failCriterion": "Watery eyes, crushed layers — cell walls are bursting instead of slicing.",
      "source": "America's Test Kitchen"
    },
    {
      "name": "Light reflection test",
      "method": "Hold the blade under direct light and sight down the edge.",
      "passCriterion": "No visible reflection along the edge (a true edge has zero width).",
      "failCriterion": "Visible white-line reflections indicate a rounded-over (dull) edge.",
      "source": "Professional sharpener consensus"
    }
  ],
  "glossary": [
    {
      "term": "Honing",
      "definition": "Realigning a knife's existing edge using a rod or steel. Removes no metal. Performed frequently (daily for pros, weekly for home cooks).",
      "source": "Wüsthof"
    },
    {
      "term": "Sharpening",
      "definition": "Removing metal from the blade to create a new edge. Performed infrequently — every 3–6 months for home cooks, weekly for pros.",
      "source": "Wüsthof"
    },
    {
      "term": "Edge angle",
      "definition": "The angle formed between the blade's bevel and the cutting plane, measured per side. Smaller angles cut more keenly; larger angles hold longer.",
      "source": "Wüsthof"
    },
    {
      "term": "HRC (Rockwell C hardness)",
      "definition": "A standardized scale for steel hardness. Kitchen knives typically range from HRC 56 (softer German) to HRC 64+ (harder Japanese).",
      "source": "ASTM International"
    },
    {
      "term": "Bevel",
      "definition": "The angled surface that forms the cutting edge. Most kitchen knives are double-beveled (symmetric); traditional Japanese knives are often single-beveled.",
      "source": "Shun"
    }
  ],
  "bladeSteels": [
    {
      "type": "High-carbon stainless (e.g., X50CrMoV15)",
      "hrcRange": "56–58",
      "common": "Wüsthof, Henckels, Zwilling",
      "notes": "Easy to sharpen, corrosion-resistant, decent edge retention. Most German kitchen knives."
    },
    {
      "type": "VG-10",
      "hrcRange": "60–62",
      "common": "Shun, Miyabi",
      "notes": "Harder, takes a keener edge, but more brittle. Popular Japanese stainless."
    },
    {
      "type": "AUS-10 / AUS-8",
      "hrcRange": "58–60",
      "common": "Mid-range Japanese knives",
      "notes": "Good balance of edge retention and ease of sharpening."
    },
    {
      "type": "White #2 / Blue #2 (carbon)",
      "hrcRange": "60–64",
      "common": "Traditional Japanese single-bevel knives",
      "notes": "Takes the sharpest edge, but rusts quickly and requires careful maintenance."
    }
  ]
}