{
  "slug": "drip-edge-calculator",
  "title": "Drip Edge Calculator",
  "heading": "Drip Edge Calculator",
  "category": "other",
  "url": "https://www.revenuelab.fyi/toolbox/drip-edge-calculator",
  "summary": "Calculate linear feet and pieces of drip edge needed around your roof's eaves and rakes.",
  "description": "Drip edge is a metal flashing installed along a roof's eaves and rakes (the horizontal and sloped edges) to direct water away from the fascia and into the gutter rather than letting it wick back under the shingles and rot the roof deck, and it's sold in standard 10-foot lengths. This calculator takes the total linear footage of your roof's perimeter — eaves plus rakes, which you can get by adding up each edge's length — and divides by 10 feet per piece, rounding up since drip edge pieces overlap slightly at joints (usually 1-2 inches) rather than butting perfectly end to end. It also applies a small waste factor for that overlap and for any cuts needed at corners, valleys, or irregular roof shapes. Drip edge is inexpensive relative to the rest of a roofing job but is a code requirement in most jurisdictions and one of the most common items missed or under-ordered by first-time DIY roofers who focus heavily on shingle and underlayment counts while treating the perimeter flashing as an afterthought.",
  "formula": "Pieces = ceil((Perimeter ÷ (10 − Overlap ft)) ).",
  "dateModified": "2026-09-06",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=drip-edge-calculator",
  "inputs": [
    {
      "id": "perimeter",
      "label": "Total eave + rake length",
      "kind": "number",
      "hint": null,
      "default": 180,
      "unit": "ft",
      "min": 10,
      "max": null
    },
    {
      "id": "overlapIn",
      "label": "Overlap per joint",
      "kind": "number",
      "hint": null,
      "default": 2,
      "unit": "in",
      "min": 0,
      "max": 6
    }
  ],
  "outputs": [
    {
      "id": "pieces",
      "label": "10ft drip edge pieces needed",
      "format": "number",
      "hint": null,
      "primary": true
    },
    {
      "id": "totalLinearFeet",
      "label": "Total linear feet purchased",
      "format": "number",
      "hint": "ft",
      "primary": false
    },
    {
      "id": "rawPieces",
      "label": "Exact pieces before rounding",
      "format": "decimal",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Total eave + rake length: 180 ft",
      "Overlap per joint: 2 in"
    ],
    "outputs": [
      "10ft drip edge pieces needed: 19",
      "Total linear feet purchased: 190",
      "Exact pieces before rounding: 18.31"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter total eave + rake length (ft).",
      "Enter overlap per joint (in).",
      "Read your 10ft drip edge pieces needed on the right — it updates as you type.",
      "Hit Share to keep the scenario or send it to someone."
    ]
  },
  "scenarios": [
    {
      "name": "Conservative",
      "description": "Lower-end numbers — what if things land soft?",
      "values": {
        "perimeter": 110,
        "overlapIn": 1.2
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "perimeter": 180,
        "overlapIn": 2
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "perimeter": 290,
        "overlapIn": 3.2
      }
    }
  ],
  "limitations": [
    "Estimates assume standard, average conditions — local rules, pricing, and materials vary.",
    "Results are rounded for readability; add a buffer before ordering, booking, or committing.",
    "Double-check anything with a real cost attached against a local quote."
  ],
  "faq": [
    {
      "q": "Do I need drip edge on both eaves and rakes?",
      "a": "Yes, most codes require drip edge along both the horizontal eaves and the sloped rake edges of a roof, installed under the underlayment at eaves and over the underlayment at rakes, per most manufacturer and code specifications."
    },
    {
      "q": "What length does drip edge come in?",
      "a": "Standard drip edge is sold in 10-foot lengths, though some suppliers carry 8-foot or custom-bent lengths for larger commercial jobs; residential DIY projects almost always use the 10-foot standard."
    },
    {
      "q": "How much overlap does drip edge need at joints?",
      "a": "Most installations use a 1-2 inch overlap at each joint to ensure continuous water shedding without gaps, which slightly reduces the effective coverage per piece versus the full 10 feet."
    },
    {
      "q": "Is drip edge required by code?",
      "a": "In most U.S. jurisdictions under the IRC, yes — drip edge is a code requirement at eaves and rakes on new roofing installations, so it shouldn't be skipped even on a budget reroof."
    }
  ],
  "related": [
    "https://www.revenuelab.fyi/toolbox/roofing-squares-calculator",
    "https://www.revenuelab.fyi/toolbox/shingle-bundles-calculator",
    "https://www.revenuelab.fyi/toolbox/underlayment-rolls-calculator"
  ],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — Drip Edge Calculator (https://www.revenuelab.fyi/toolbox/drip-edge-calculator)"
}