# Resonant Frequency Calculator API

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

Calculate LC/RLC resonant frequency, inductance, capacitance, impedance, Q factor, and bandwidth.

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

- Slug: `resonant-frequency-calculator`
- Category: `science`
- 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/resonant-frequency-calculator/

## Endpoint

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

## Request body

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `solve_for` | `str` | no | freq | inductance | capacitance Choices: freq, inductance, capacitance |
| `circuit_type` | `str` | no | series | parallel Choices: series, parallel |
| `inductance` | `float | None` | no |  |
| `capacitance` | `float | None` | no |  |
| `resistance` | `float | None` | no |  |
| `frequency` | `float | None` | no |  |
| `l_unit` | `str` | no | h | mh | uh | nh Choices: h, mh, uh, nh |
| `c_unit` | `str` | no | f | mf | uf | nf | pf Choices: f, mf, uf, nf, pf |
| `r_unit` | `str` | no | ohm | kohm | mohm Choices: ohm, kohm, mohm |
| `f_unit` | `str` | no | hz | khz | mhz | ghz Choices: hz, khz, mhz, ghz |

## Example request

```json
{
  "solve_for": "freq",
  "circuit_type": "series",
  "inductance": 100,
  "capacitance": 100,
  "l_unit": "uh",
  "c_unit": "pf",
  "r_unit": "ohm",
  "f_unit": "mhz"
}
```

## cURL

```bash
curl -X POST https://api.miniwebtool.com/v1/tools/resonant-frequency-calculator/run \
  -H 'Authorization: Bearer mwt_live_YOUR_KEY' \
  -H 'Content-Type: application/json' \
  -d '{"solve_for":"freq","circuit_type":"series","inductance":100,"capacitance":100,"l_unit":"uh","c_unit":"pf","r_unit":"ohm","f_unit":"mhz"}'
```

## Response envelope

```json
{
  "request_id": "01K...",
  "tool": "resonant-frequency-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 Resonant Frequency Calculator API do?

Calculate LC/RLC resonant frequency, inductance, capacitance, impedance, Q factor, and bandwidth. 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.