# Bend Allowance Calculator API

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

Calculate sheet-metal bend allowance, setback, deduction and flat-pattern length.

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

- Slug: `bend-allowance-calculator`
- Category: `miscellaneous`
- 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

## Endpoint

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

## Request body

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `thickness` | `float` | no | sheet thickness; use one consistent length unit |
| `inside_radius` | `float` | no | inside bend radius |
| `angle_degrees` | `float` | no | included bend angle in degrees |
| `k_factor` | `float` | no | neutral-axis K-factor |
| `flange_a` | `float` | no | first flange length |
| `flange_b` | `float` | no | second flange length |
| `dimension_mode` | `str` | no | outside | tangent Choices: outside, tangent |

## Example request

```json
{
  "thickness": 2,
  "inside_radius": 2,
  "angle_degrees": 90,
  "k_factor": 0.44,
  "flange_a": 50,
  "flange_b": 50,
  "dimension_mode": "outside"
}
```

## cURL

```bash
curl -X POST https://api.miniwebtool.com/v1/tools/bend-allowance-calculator/run \
  -H 'Authorization: Bearer mwt_live_YOUR_KEY' \
  -H 'Content-Type: application/json' \
  -d '{"thickness":2,"inside_radius":2,"angle_degrees":90,"k_factor":0.44,"flange_a":50,"flange_b":50,"dimension_mode":"outside"}'
```

## Response envelope

```json
{
  "request_id": "01K...",
  "tool": "bend-allowance-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 Bend Allowance Calculator API do?

Calculate sheet-metal bend allowance, setback, deduction and flat-pattern length. 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.