{
  "title": "Break even",
  "human_url": "https://happytails.ai/en/calculators/break-even/",
  "agent_url": "https://happytails.ai/agents/en/calculators/break-even/",
  "language": "en",
  "markdown_url": "https://happytails.ai/en/calculators/break-even.md",
  "content": "Break even\nFind how many units cover your fixed and variable costs.\nHow to use Break even\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.\nWhat to expect\nFind how many units cover your fixed and variable costs. The result rounds up fixed costs ÷ (price per unit − variable cost per unit). Selling price must exceed variable cost.\nUseful next steps\nMargin\nCalculate profit and profit margin from cost and selling price.\nMarkup\nCalculate profit and markup from cost and selling price.\nPercentage change\nCalculate the percentage increase or decrease between two values.",
  "content_format": "text/plain",
  "visibility": "public",
  "links": [
    {
      "name": "Margin Calculate profit and profit margin from cost and selling price.",
      "url": "https://happytails.ai/en/calculators/margin/"
    },
    {
      "name": "Markup Calculate profit and markup from cost and selling price.",
      "url": "https://happytails.ai/en/calculators/markup/"
    },
    {
      "name": "Percentage change Calculate the percentage increase or decrease between two values.",
      "url": "https://happytails.ai/en/calculators/percentage-change/"
    }
  ],
  "tool": {
    "id": "break-even",
    "category": "calculators",
    "built": true,
    "requirements": "Fixed cost, variable cost and unit price; show infeasible/nonpositive contribution cases.",
    "implementation": {
      "fields": [
        {
          "key": "fixed",
          "label": "Fixed costs",
          "value": 1000,
          "type": "number"
        },
        {
          "key": "price",
          "label": "Price per unit",
          "value": 25,
          "type": "number"
        },
        {
          "key": "cost",
          "label": "Variable cost per unit",
          "value": 10,
          "type": "number"
        }
      ],
      "input": false,
      "note": "",
      "live": true,
      "presentation": "metrics",
      "experience": {
        "automatic": true,
        "single": false,
        "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": "POST /api/v1/tools/break-even/run",
    "api": {
      "id": "break-even",
      "name": "Break even",
      "category": "calculators",
      "description": "Find how many units cover your fixed and variable costs.",
      "notes": "",
      "human_path": "/en/calculators/break-even/",
      "method": "POST",
      "endpoint": "/api/v1/tools/break-even/run",
      "schema_url": "/api/v1/tools/break-even",
      "input_schema": {
        "type": "object",
        "additionalProperties": false,
        "properties": {
          "input": {
            "type": "string",
            "maxLength": 1000000,
            "default": "",
            "description": "Plain text input. File tools use files instead unless otherwise documented."
          },
          "options": {
            "type": "object",
            "additionalProperties": false,
            "properties": {
              "fixed": {
                "type": "number",
                "description": "Fixed costs",
                "default": 1000.0
              },
              "price": {
                "type": "number",
                "description": "Price per unit",
                "default": 25.0
              },
              "cost": {
                "type": "number",
                "description": "Variable cost per unit",
                "default": 10.0
              }
            }
          }
        }
      },
      "output_schema": {
        "type": "object",
        "required": [
          "tool",
          "result"
        ],
        "properties": {
          "tool": {
            "type": "string"
          },
          "result": {
            "type": "object",
            "required": [
              "text",
              "files"
            ],
            "properties": {
              "text": {
                "type": [
                  "string",
                  "null"
                ]
              },
              "data": {
                "description": "Parsed JSON when the textual result is JSON."
              },
              "name": {
                "type": "string"
              },
              "mime": {
                "type": "string"
              },
              "files": {
                "type": "array",
                "items": {
                  "type": "object",
                  "required": [
                    "name",
                    "mime",
                    "bytes",
                    "base64"
                  ],
                  "properties": {
                    "name": {
                      "type": "string"
                    },
                    "mime": {
                      "type": "string"
                    },
                    "bytes": {
                      "type": "integer"
                    },
                    "base64": {
                      "type": "string",
                      "contentEncoding": "base64"
                    }
                  }
                }
              }
            }
          }
        }
      },
      "processing": "Server; same transformation code as browser tools",
      "limits": {
        "request_bytes": 8388608,
        "input_characters": 1000000,
        "files_bytes": 5242880,
        "max_files": 0,
        "timeout_seconds": 12
      }
    },
    "agent_processing": "Server; same transformation code as browser tools",
    "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": "# Break even\n\n- Human page: https://happytails.ai/en/calculators/break-even/\n- Markdown: https://happytails.ai/en/calculators/break-even.md\n- Structured JSON: https://happytails.ai/agents/en/calculators/break-even/index.json\n- Visibility: public\n\n## Tool capabilities\n\n| Property | Value |\n| --- | --- |\n| Tool ID | `break-even` |\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 | /api/v1/tools/break-even/run |\n| Browser-agent interface | run_current_tool |\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| `fixed` | Fixed costs | number | 1000 |  |\n| `price` | Price per unit | number | 25 |  |\n| `cost` | Variable cost per unit | number | 10 |  |\n\n### HTTP contract\n\nAPI calls process supplied data on the server. The website origin is `https://happytails.ai`. Server API hosting is not connected on the public website yet. Use your local server origin to test these requests.\n\n```http\nPOST https://happytails.ai/api/v1/tools/break-even/run\nContent-Type: application/json\n```\n\n[Detailed operation reference](https://happytails.ai/en/api/tools/break-even.md) · [Shared API guide](https://happytails.ai/en/api.md)\n\n#### Limits\n\n| Limit | Value |\n| --- | --- |\n| request_bytes | 8388608 |\n| input_characters | 1000000 |\n| files_bytes | 5242880 |\n| max_files | 0 |\n| timeout_seconds | 12 |\n\n#### Complete input schema\n\n```json\n{\n  \"type\": \"object\",\n  \"additionalProperties\": false,\n  \"properties\": {\n    \"input\": {\n      \"type\": \"string\",\n      \"maxLength\": 1000000,\n      \"default\": \"\",\n      \"description\": \"Plain text input. File tools use files instead unless otherwise documented.\"\n    },\n    \"options\": {\n      \"type\": \"object\",\n      \"additionalProperties\": false,\n      \"properties\": {\n        \"fixed\": {\n          \"type\": \"number\",\n          \"description\": \"Fixed costs\",\n          \"default\": 1000.0\n        },\n        \"price\": {\n          \"type\": \"number\",\n          \"description\": \"Price per unit\",\n          \"default\": 25.0\n        },\n        \"cost\": {\n          \"type\": \"number\",\n          \"description\": \"Variable cost per unit\",\n          \"default\": 10.0\n        }\n      }\n    }\n  }\n}\n```\n\n#### Complete output schema\n\n```json\n{\n  \"type\": \"object\",\n  \"required\": [\n    \"tool\",\n    \"result\"\n  ],\n  \"properties\": {\n    \"tool\": {\n      \"type\": \"string\"\n    },\n    \"result\": {\n      \"type\": \"object\",\n      \"required\": [\n        \"text\",\n        \"files\"\n      ],\n      \"properties\": {\n        \"text\": {\n          \"type\": [\n            \"string\",\n            \"null\"\n          ]\n        },\n        \"data\": {\n          \"description\": \"Parsed JSON when the textual result is JSON.\"\n        },\n        \"name\": {\n          \"type\": \"string\"\n        },\n        \"mime\": {\n          \"type\": \"string\"\n        },\n        \"files\": {\n          \"type\": \"array\",\n          \"items\": {\n            \"type\": \"object\",\n            \"required\": [\n              \"name\",\n              \"mime\",\n              \"bytes\",\n              \"base64\"\n            ],\n            \"properties\": {\n              \"name\": {\n                \"type\": \"string\"\n              },\n              \"mime\": {\n                \"type\": \"string\"\n              },\n              \"bytes\": {\n                \"type\": \"integer\"\n              },\n              \"base64\": {\n                \"type\": \"string\",\n                \"contentEncoding\": \"base64\"\n              }\n            }\n          }\n        }\n      }\n    }\n  }\n}\n```\n\n#### Error and retry handling\n\nFailures return a non-200 status and `error.code` plus `error.message`. Correct invalid input before retrying; retry server-busy responses with bounded backoff. Returned files contain Base64 data, not persistent download URLs. Decode and inspect the output before treating conversion as successful. See the shared API guide for the complete status and timeout rules.\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\nFixed cost, variable cost and unit price; show infeasible/nonpositive contribution cases.\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\": \"break-even\",\n  \"category\": \"calculators\",\n  \"built\": true,\n  \"requirements\": \"Fixed cost, variable cost and unit price; show infeasible/nonpositive contribution cases.\",\n  \"implementation\": {\n    \"fields\": [\n      {\n        \"key\": \"fixed\",\n        \"label\": \"Fixed costs\",\n        \"value\": 1000,\n        \"type\": \"number\"\n      },\n      {\n        \"key\": \"price\",\n        \"label\": \"Price per unit\",\n        \"value\": 25,\n        \"type\": \"number\"\n      },\n      {\n        \"key\": \"cost\",\n        \"label\": \"Variable cost per unit\",\n        \"value\": 10,\n        \"type\": \"number\"\n      }\n    ],\n    \"input\": false,\n    \"note\": \"\",\n    \"live\": true,\n    \"presentation\": \"metrics\",\n    \"experience\": {\n      \"automatic\": true,\n      \"single\": false,\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\": \"POST /api/v1/tools/break-even/run\",\n  \"api\": {\n    \"id\": \"break-even\",\n    \"name\": \"Break even\",\n    \"category\": \"calculators\",\n    \"description\": \"Find how many units cover your fixed and variable costs.\",\n    \"notes\": \"\",\n    \"human_path\": \"/en/calculators/break-even/\",\n    \"method\": \"POST\",\n    \"endpoint\": \"/api/v1/tools/break-even/run\",\n    \"schema_url\": \"/api/v1/tools/break-even\",\n    \"input_schema\": {\n      \"type\": \"object\",\n      \"additionalProperties\": false,\n      \"properties\": {\n        \"input\": {\n          \"type\": \"string\",\n          \"maxLength\": 1000000,\n          \"default\": \"\",\n          \"description\": \"Plain text input. File tools use files instead unless otherwise documented.\"\n        },\n        \"options\": {\n          \"type\": \"object\",\n          \"additionalProperties\": false,\n          \"properties\": {\n            \"fixed\": {\n              \"type\": \"number\",\n              \"description\": \"Fixed costs\",\n              \"default\": 1000.0\n            },\n            \"price\": {\n              \"type\": \"number\",\n              \"description\": \"Price per unit\",\n              \"default\": 25.0\n            },\n            \"cost\": {\n              \"type\": \"number\",\n              \"description\": \"Variable cost per unit\",\n              \"default\": 10.0\n            }\n          }\n        }\n      }\n    },\n    \"output_schema\": {\n      \"type\": \"object\",\n      \"required\": [\n        \"tool\",\n        \"result\"\n      ],\n      \"properties\": {\n        \"tool\": {\n          \"type\": \"string\"\n        },\n        \"result\": {\n          \"type\": \"object\",\n          \"required\": [\n            \"text\",\n            \"files\"\n          ],\n          \"properties\": {\n            \"text\": {\n              \"type\": [\n                \"string\",\n                \"null\"\n              ]\n            },\n            \"data\": {\n              \"description\": \"Parsed JSON when the textual result is JSON.\"\n            },\n            \"name\": {\n              \"type\": \"string\"\n            },\n            \"mime\": {\n              \"type\": \"string\"\n            },\n            \"files\": {\n              \"type\": \"array\",\n              \"items\": {\n                \"type\": \"object\",\n                \"required\": [\n                  \"name\",\n                  \"mime\",\n                  \"bytes\",\n                  \"base64\"\n                ],\n                \"properties\": {\n                  \"name\": {\n                    \"type\": \"string\"\n                  },\n                  \"mime\": {\n                    \"type\": \"string\"\n                  },\n                  \"bytes\": {\n                    \"type\": \"integer\"\n                  },\n                  \"base64\": {\n                    \"type\": \"string\",\n                    \"contentEncoding\": \"base64\"\n                  }\n                }\n              }\n            }\n          }\n        }\n      }\n    },\n    \"processing\": \"Server; same transformation code as browser tools\",\n    \"limits\": {\n      \"request_bytes\": 8388608,\n      \"input_characters\": 1000000,\n      \"files_bytes\": 5242880,\n      \"max_files\": 0,\n      \"timeout_seconds\": 12\n    }\n  },\n  \"agent_processing\": \"Server; same transformation code as browser tools\",\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\nFind how many units cover your fixed and variable costs.\n\n## How to use Break even\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## What to expect\n\nFind how many units cover your fixed and variable costs. The result rounds up fixed costs ÷ (price per unit − variable cost per unit). Selling price must exceed variable cost.\n\n## Useful next steps\n\n- [Margin](https://happytails.ai/en/calculators/margin/): Calculate profit and profit margin from cost and selling price. ([Markdown](https://happytails.ai/en/calculators/margin.md))\n\n- [Markup](https://happytails.ai/en/calculators/markup/): Calculate profit and markup from cost and selling price. ([Markdown](https://happytails.ai/en/calculators/markup.md))\n\n- [Percentage change](https://happytails.ai/en/calculators/percentage-change/): Calculate the percentage increase or decrease between two values. ([Markdown](https://happytails.ai/en/calculators/percentage-change.md))\n"
}