{
  "title": "Percentage difference calculator",
  "human_url": "https://happytails.ai/en/calculators/percentage-difference/",
  "agent_url": "https://happytails.ai/agents/en/calculators/percentage-difference/",
  "language": "en",
  "markdown_url": "https://happytails.ai/en/calculators/percentage-difference.md",
  "content": "Percentage difference calculator\nCompare two values without picking a starting point.\nHow can we improve this tool?\nReport a problem or share an idea.\nPlease leave out private information. Your message and the tool name go to our team via PostHog.\nHow to use Percentage difference calculator\nEnter the values you want to calculate and choose the relevant units or settings.\nThe result updates as you type. Adjust the available settings if needed.\nReview the result, then use Copy result or a download link when available.\nUseful next steps\nPercentage change\nPercentage\nDiscount\nHow to use it\nEnter two nonnegative values. The percentage difference is their absolute difference divided by their average, multiplied by 100.\nA worked example\nFor 100 and 120, the difference is 20 and the average is 110. The percentage difference is 18.1818%. Swapping the two values gives the same answer.\nWhat to know\nPercentage difference treats both values equally. Percentage change uses an original value as its denominator. Use the separate Percentage change tool for growth or decline over time. Two zero values return 0%.",
  "content_format": "text/plain",
  "visibility": "public",
  "links": [
    {
      "name": "Percentage change",
      "url": "https://happytails.ai/en/calculators/percentage-change/"
    },
    {
      "name": "Percentage",
      "url": "https://happytails.ai/en/calculators/percentage/"
    },
    {
      "name": "Discount",
      "url": "https://happytails.ai/en/calculators/discount/"
    }
  ],
  "tool": {
    "id": "percentage-difference",
    "category": "calculators",
    "built": true,
    "requirements": "Percentage difference treats both values equally. Percentage change uses an original value as its denominator. Use the separate Percentage change tool for growth or decline over time. Two zero values return 0%.",
    "implementation": {
      "fields": [
        {
          "key": "a",
          "label": "First value",
          "value": 100,
          "type": "number",
          "min": 0,
          "max": 1e+100,
          "step": "any"
        },
        {
          "key": "b",
          "label": "Second value",
          "value": 120,
          "type": "number",
          "min": 0,
          "max": 1e+100,
          "step": "any"
        }
      ],
      "input": false,
      "live": true,
      "presentation": "metrics",
      "note": "For two nonnegative values: absolute difference divided by their average, times 100. This is symmetric; use Percentage change when one value is the original. Two zeros give 0%.",
      "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.",
        "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"
    }
  },
  "markdown": "# Percentage difference calculator\n\n- Human page: https://happytails.ai/en/calculators/percentage-difference/\n- Markdown: https://happytails.ai/en/calculators/percentage-difference.md\n- Structured JSON: https://happytails.ai/agents/en/calculators/percentage-difference/index.json\n- Visibility: public\n\n## Tool capabilities\n\n| Property | Value |\n| --- | --- |\n| Tool ID | `percentage-difference` |\n| Category | calculators |\n| Implementation | Registered implementation. Registration alone is not a production-quality guarantee. |\n| Browser execution | Automatic updates after valid input or file selection. |\n| Browser processing | Browser; see tool notes for network behavior. |\n| HTTP API | Not callable through HTTP. |\n| Browser-agent interface | run_current_tool |\n\n### Implementation notes\n\nFor two nonnegative values: absolute difference divided by their average, times 100. This is symmetric; use Percentage change when one value is the original. Two zeros give 0%.\n\n### Inputs and settings\n\nNo free-text input is required. Use the file inputs and/or settings below.\n\n| Setting | Meaning | Control type | Default | Constraints |\n| --- | --- | --- | --- | --- |\n| `a` | First value | number | 100 | min=0 max=1e+100 step=any |\n| `b` | Second value | number | 120 | min=0 max=1e+100 step=any |\n\n### Browser-agent workflow\n\n1. Open the human page in a browser that supports WebMCP.\n2. Discover the interface exposed by that page; use its actual schema.\n3. Select files on the page first when the tool requires files.\n4. Call `run_current_tool` with valid input and settings.\n5. Inspect the returned result or error and the displayed output. Retrieve files from the displayed download links.\n\nCalls do not automatically copy or download results. Browser permissions still apply. Interface availability alone is not proof of successful execution.\n\n### Planning specification\n\nPercentage difference treats both values equally. Percentage change uses an original value as its denominator. Use the separate Percentage change tool for growth or decline over time. Two zero values return 0%.\n\nThis describes intended requirements. Use the implementation notes, interface schema and observed output to determine current support.\n\n### Complete machine-readable capability record\n\n```json\n{\n  \"id\": \"percentage-difference\",\n  \"category\": \"calculators\",\n  \"built\": true,\n  \"requirements\": \"Percentage difference treats both values equally. Percentage change uses an original value as its denominator. Use the separate Percentage change tool for growth or decline over time. Two zero values return 0%.\",\n  \"implementation\": {\n    \"fields\": [\n      {\n        \"key\": \"a\",\n        \"label\": \"First value\",\n        \"value\": 100,\n        \"type\": \"number\",\n        \"min\": 0,\n        \"max\": 1e+100,\n        \"step\": \"any\"\n      },\n      {\n        \"key\": \"b\",\n        \"label\": \"Second value\",\n        \"value\": 120,\n        \"type\": \"number\",\n        \"min\": 0,\n        \"max\": 1e+100,\n        \"step\": \"any\"\n      }\n    ],\n    \"input\": false,\n    \"live\": true,\n    \"presentation\": \"metrics\",\n    \"note\": \"For two nonnegative values: absolute difference divided by their average, times 100. This is symmetric; use Percentage change when one value is the original. Two zeros give 0%.\",\n    \"experience\": {\n      \"automatic\": true,\n      \"single\": false,\n      \"inputMaxLength\": 1000000,\n      \"inputMode\": \"text\",\n      \"label\": \"Your text\",\n      \"placeholder\": \"Type or paste your input…\",\n      \"help\": \"Change the input or settings to update your result. Results update as you type. Up to 1,000,000 characters.\",\n      \"action\": null\n    },\n    \"mode\": \"automatic\",\n    \"interactive\": false\n  },\n  \"execution\": \"Browser interface\",\n  \"api\": null,\n  \"browser_agent\": {\n    \"supported\": true,\n    \"name\": \"run_current_tool\",\n    \"discovery\": \"WebMCP on the human page in a supporting browser\",\n    \"verification\": \"See audit/API-AUDIT.md; availability is not verification\"\n  }\n}\n```\n\n## Page guide\n\nCompare two values without picking a starting point.\n\nHow can we improve this tool?\n\nReport a problem or share an idea.\n\nPlease leave out private information. Your message and the tool name go to our team via PostHog.\n\n### How to use Percentage difference calculator\n\n1. Enter the values you want to calculate and choose the relevant units or settings.\n2. The result updates as you type. Adjust the available settings if needed.\n3. Review the result, then use Copy result or a download link when available.\n\n## Useful next steps\n\n- [Percentage change](https://happytails.ai/en/calculators/percentage-change/) ([Markdown](https://happytails.ai/en/calculators/percentage-change.md))\n\n- [Percentage](https://happytails.ai/en/calculators/percentage/) ([Markdown](https://happytails.ai/en/calculators/percentage.md))\n\n- [Discount](https://happytails.ai/en/calculators/discount/) ([Markdown](https://happytails.ai/en/calculators/discount.md))\n\n## How to use it\n\nEnter two nonnegative values. The percentage difference is their absolute difference divided by their average, multiplied by 100.\n\n### A worked example\n\nFor 100 and 120, the difference is 20 and the average is 110. The percentage difference is 18.1818%. Swapping the two values gives the same answer.\n\n### What to know\n\nPercentage difference treats both values equally. Percentage change uses an original value as its denominator. Use the separate Percentage change tool for growth or decline over time. Two zero values return 0%.\n"
}