# Grade calculator

- Human page: https://happytails.ai/en/education-tools/grade-calculator/
- Markdown: https://happytails.ai/en/education-tools/grade-calculator.md
- Structured JSON: https://happytails.ai/agents/en/education-tools/grade-calculator/index.json
- Visibility: public

## Tool capabilities

| Property | Value |
| --- | --- |
| Tool ID | `grade-calculator` |
| Category | education-tools |
| Implementation | Registered implementation. Registration alone is not a production-quality guarantee. |
| Browser execution | Automatic updates after valid input or file selection. |
| Browser processing | Browser; see tool notes for network behavior. |
| HTTP API | /api/v1/tools/grade-calculator/run |
| Browser-agent interface | run_current_tool |

### Implementation notes

One score,weight pair per line. For GPA use numeric grade points and course credits.

### Inputs and settings

Text input: Scores and weights.

Example or placeholder shown in the interface (not a validated fixture):

```text
80,1
90,1
```

Add one score,weight pair per line. Use the same score scale throughout. Results update as you type. Up to 1,000,000 characters.

No additional settings are declared for this tool.

### HTTP contract

API 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.

```http
POST https://happytails.ai/api/v1/tools/grade-calculator/run
Content-Type: application/json
```

[Detailed operation reference](https://happytails.ai/en/api/tools/grade-calculator.md) · [Shared API guide](https://happytails.ai/en/api.md)

#### Limits

| Limit | Value |
| --- | --- |
| request_bytes | 8388608 |
| input_characters | 1000000 |
| files_bytes | 5242880 |
| max_files | 0 |
| timeout_seconds | 12 |

#### Complete input schema

```json
{
  "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": {}
    }
  }
}
```

#### Complete output schema

```json
{
  "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"
              }
            }
          }
        }
      }
    }
  }
}
```

#### Error and retry handling

Failures 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.

### Browser-agent workflow

1. Open the human page in a browser that supports WebMCP.
2. Discover the interface exposed by that page; use its actual schema.
3. Select files on the page first when the tool requires files.
4. Call `run_current_tool` with valid input and settings.
5. Inspect the returned result or error and the displayed output. Retrieve files from the displayed download links.

Calls do not automatically copy or download results. Browser permissions still apply. Interface availability alone is not proof of successful execution.

### Planning specification

Weighted and point-based grades; editable thresholds and no implied universal grading system.

This describes intended requirements. Use the implementation notes, interface schema and observed output to determine current support.

### Complete machine-readable capability record

```json
{
  "id": "grade-calculator",
  "category": "education-tools",
  "built": true,
  "requirements": "Weighted and point-based grades; editable thresholds and no implied universal grading system.",
  "implementation": {
    "fields": [],
    "note": "One score,weight pair per line. For GPA use numeric grade points and course credits.",
    "experience": {
      "automatic": true,
      "single": false,
      "label": "Scores and weights",
      "placeholder": "80,1\n90,1",
      "help": "Add one score,weight pair per line. Use the same score scale throughout. Results update as you type. Up to 1,000,000 characters.",
      "action": null
    },
    "mode": "automatic",
    "interactive": false
  },
  "execution": "POST /api/v1/tools/grade-calculator/run",
  "api": {
    "id": "grade-calculator",
    "name": "Grade calculator",
    "category": "education-tools",
    "description": "Calculate a weighted average from scores and their weights.",
    "notes": "One score,weight pair per line. For GPA use numeric grade points and course credits.",
    "human_path": "/en/education-tools/grade-calculator/",
    "method": "POST",
    "endpoint": "/api/v1/tools/grade-calculator/run",
    "schema_url": "/api/v1/tools/grade-calculator",
    "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": {}
        }
      }
    },
    "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"
  }
}
```

## Page guide

Calculate a weighted average from scores and their weights.

## How to use Grade calculator

1. Enter your text in the input field.
2. The result updates as you type. Adjust the available settings if needed.
3. Review the result, then use Copy result or a download link when available.

## What to expect

Calculate a weighted average from scores and their weights. Enter one score,weight pair per line. Weights can be percentages or relative values, provided they use a consistent scale. At least one weight must be positive.

## Useful next steps

- [Gpa calculator](https://happytails.ai/en/education-tools/gpa-calculator/): Calculate a weighted GPA from grade points and course credits. ([Markdown](https://happytails.ai/en/education-tools/gpa-calculator.md))

- [Final grade](https://happytails.ai/en/education-tools/final-grade/): Find the final-exam score needed to reach a target course grade. ([Markdown](https://happytails.ai/en/education-tools/final-grade.md))