# kVA Calculator API

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

Solve kVA, kW, kVAR, volts or amps for DC, single-phase and three-phase systems.

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

- Slug: `kva-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
- Browser tool: https://miniwebtool.com/kva-calculator/

## Endpoint

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

## Request body

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `solve_for` | `str` | no | amps | power | volts Choices: amps, power, volts |
| `phase` | `str` | no | dc | single | three Choices: dc, single, three |
| `power_value` | `float` | no | input kVA or kW when solving amps or volts |
| `power_unit` | `str` | no | kva | kw Choices: kva, kw |
| `voltage` | `float` | no | voltage when used |
| `current` | `float` | no | current in amps when used |
| `power_factor` | `float` | no | AC power factor; ignored for DC |

## Example request

```json
{
  "solve_for": "amps",
  "phase": "single",
  "power_value": 10,
  "power_unit": "kva",
  "voltage": 240,
  "current": 20,
  "power_factor": 0.8
}
```

## cURL

```bash
curl -X POST https://api.miniwebtool.com/v1/tools/kva-calculator/run \
  -H 'Authorization: Bearer mwt_live_YOUR_KEY' \
  -H 'Content-Type: application/json' \
  -d '{"solve_for":"amps","phase":"single","power_value":10,"power_unit":"kva","voltage":240,"current":20,"power_factor":0.8}'
```

## Response envelope

```json
{
  "request_id": "01K...",
  "tool": "kva-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 kVA Calculator API do?

Solve kVA, kW, kVAR, volts or amps for DC, single-phase and three-phase systems. 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.