# Ratio Calculator API

> For the complete documentation index, see [llms.txt](/llms.txt).

Solve a:b = c:d proportions, simplify or scale ratios, and generate equivalent ratio tables.

Use this endpoint to add the tool to your app, site, workflow, or agent without rebuilding formulas, validation, examples, and docs.

- Slug: `ratio-calculator`
- Category: `math`
- Version: `2026-04-22`
- Credits per successful call: 1
- Starts on: free
- Max payload: 65536 bytes
- Privacy mode: `hash_only`
- Available on: free, starter, pro, business, scale
- Browser tool: https://miniwebtool.com/ratio-calculator/

## Endpoint

`POST https://api.miniwebtool.com/v1/tools/ratio-calculator/run`

## Request body

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `mode` | `str` | no | solve | simplify | scale | equivalent Choices: solve, simplify, scale, equivalent |
| `a` | `str | None` | no | Proportion a:b = c:d — leave one of a, b, c, d empty to solve for it |
| `b` | `str | None` | no |  |
| `c` | `str | None` | no |  |
| `d` | `str | None` | no |  |
| `ratio` | `str | None` | no | Ratio like 12:8 or 15:25:35 (modes simplify, scale, equivalent) |
| `scale_factor` | `float | None` | no |  |
| `count` | `int` | no |  |

## Example request

```json
{
  "mode": "simplify",
  "ratio": "12:8"
}
```

## cURL

```bash
curl -X POST https://api.miniwebtool.com/v1/tools/ratio-calculator/run \
  -H 'Authorization: Bearer mwt_live_YOUR_KEY' \
  -H 'Content-Type: application/json' \
  -d '{"mode":"simplify","ratio":"12:8"}'
```

## Response envelope

```json
{
  "request_id": "01K...",
  "tool": "ratio-calculator",
  "tool_version": "2026-04-22",
  "credits_used": 1,
  "result": {}
}
```

## Errors

Errors are RFC 7807 `application/problem+json`. Branch on `code`, not `title`.

## MCP

Agents can discover and call this tool through `https://api.miniwebtool.com/mcp` or `https://api.miniwebtool.com/v1/mcp` using MCP `tools/list` and `tools/call`.

## Frequently asked

### What does the Ratio Calculator API do?

Solve a:b = c:d proportions, simplify or scale ratios, and generate equivalent ratio tables. Use it to add this utility without rebuilding formulas, validation, examples, and documentation.

### How much does one call cost?

1 credit per successful call. Failed calls do not bill.

### What parameters are required?

Required fields: (none). Full schema at `https://api.miniwebtool.com/v1/openapi.json`.

### Is this deterministic?

Yes. Same input, same output. Tool version: 2026-04-22.