happytails.ai

Quilt fabric calculator

Open Quilt fabric calculator on Happytails.ai. This view has the same page content and links, with explicit tool capabilities. Read the processing notes before using a tool.

Tool capabilities

{
  "id": "quilt-fabric-calculator",
  "category": "calculators",
  "built": true,
  "requirements": "1–30 rectangular patch types and at most 10,000 total patches, all from one fabric. Up to 1,000 blocks. Non-rectangular patches, borders, backing, binding, print matching and shrinkage are not included.",
  "implementation": {
    "fields": [
      {
        "key": "patches",
        "label": "Rectangular patches: finished width, height, count per block",
        "value": "4, 4, 4\n2, 4, 2",
        "type": "textarea",
        "help": "One type per line, for example 4, 4, 4. All types use one fabric. Up to 30 types and 10,000 total pieces."
      },
      {
        "key": "blocks",
        "label": "Repeated blocks",
        "value": 12,
        "type": "number",
        "min": 1,
        "max": 1000,
        "step": 1
      },
      {
        "key": "seam",
        "label": "Seam allowance on each patch edge",
        "value": 0.25,
        "type": "number",
        "min": 0,
        "max": 1000000000,
        "step": "any"
      },
      {
        "key": "fabricWidth",
        "label": "Usable fabric width after selvedges",
        "value": 42,
        "type": "number",
        "min": 0,
        "max": 1000000000,
        "step": "any"
      },
      {
        "key": "squaring",
        "label": "Extra total fabric length for squaring",
        "value": 2,
        "type": "number",
        "min": 0,
        "max": 1000000000,
        "step": "any"
      },
      {
        "key": "unit",
        "label": "Patch and fabric dimension unit",
        "value": "in",
        "type": "select",
        "values": [
          "mm",
          "cm",
          "m",
          "in",
          "ft",
          "yd"
        ]
      },
      {
        "key": "rotation",
        "label": "Cut orientation",
        "value": "Allow rotation",
        "type": "select",
        "values": [
          "Allow rotation",
          "Keep entered direction"
        ]
      },
      {
        "key": "purchaseIncrement",
        "label": "Fabric purchase increment",
        "value": 0.125,
        "type": "number",
        "min": 0,
        "max": 1000000000,
        "step": "any"
      },
      {
        "key": "purchaseUnit",
        "label": "Purchase unit",
        "value": "yd",
        "type": "select",
        "values": [
          "yd",
          "m"
        ]
      }
    ],
    "input": false,
    "live": true,
    "background": true,
    "presentation": "metrics",
    "note": "Generate a strip-cutting plan with finished-to-cut seam allowances and whole rows of patches. Each patch type uses dedicated strips; this is not an optimal nesting claim. Changing units keeps the entered numbers. Calculations run on your device.",
    "experience": {
      "automatic": true,
      "single": false,
      "inputMaxLength": 1000000,
      "inputMode": "text",
      "label": "Your text",
      "placeholder": "Type or paste your input…",
      "help": "Change the input or settings to update your result. Results update as you type. Up to 1,000,000 characters.",
      "helpParts": [
        "Change the input or settings to update your result.",
        "Results update as you type.",
        "Up to 1,000,000 characters."
      ],
      "action": null
    },
    "mode": "automatic",
    "interactive": false
  },
  "execution": "Browser interface",
  "api": null,
  "browser_agent": {
    "supported": true,
    "name": "run_current_tool",
    "discovery": "WebMCP on the human page in a supporting browser",
    "verification": "See audit/API-AUDIT.md; availability is not verification"
  }
}

Page guide

Turn rectangular patch dimensions and repeated blocks into a strip-cutting plan, including seams and whole rows of patches.

How to use Quilt fabric calculator
  1. Enter your measurements, rates or supplied recipe.
  2. Review the quantities, rounding and plan details.
  3. Download the result and verify it against your actual materials or a sample.

Useful next steps

Quilt backing calculatorQuilt binding calculator

List finished patches for one block

Enter one finished width, height and quantity line per rectangular patch type. Add the block count and a seam allowance. The allowance is added to all four edges, making a 4-inch finished square a 4.5-inch cut square with quarter-inch seams.

Follow the dedicated strip plan

Each patch type receives dedicated width-of-fabric strips. When rotation is allowed, the calculator compares both orientations for that type and chooses the shorter fabric length. The exported plan shows each strip start, height, patch width and how many pieces to cut. It does not claim globally optimal nesting.

Save the plan

Download the result as CSV, plus a text or JSON report with formulas, values and assumptions. Everything is calculated on your device. Changing units keeps the entered numbers, so check the selected units before using the plan.