# Terminal Velocity Calculator API

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

Terminal velocity from mass, drag coefficient, area, and fluid density, with object presets and approach-time milestones.

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

- Slug: `terminal-velocity-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/terminal-velocity-calculator/

## Endpoint

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

## Request body

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `falling_object` | `str` | no | custom | skydiver_belly | hailstone | tennis_ball | basketball | ping_pong_ball | bowling_ball Choices: custom, skydiver_belly, hailstone, tennis_ball, basketball, ping_pong_ball, bowling_ball |
| `mass` | `float | None` | no | Mass in kg (falling_object=custom) |
| `drag_coefficient` | `float | None` | no | Drag coefficient Cd (falling_object=custom) |
| `area` | `float | None` | no | Cross-sectional area in m^2 (falling_object=custom) |
| `medium` | `str` | no | air_sea_level | air_3000m | water | custom Choices: air_sea_level, air_3000m, water, custom |
| `fluid_density` | `float | None` | no | Fluid density in kg/m^3 (medium=custom) |

## Example request

```json
{
  "falling_object": "skydiver_belly",
  "medium": "air_sea_level"
}
```

## cURL

```bash
curl -X POST https://api.miniwebtool.com/v1/tools/terminal-velocity-calculator/run \
  -H 'Authorization: Bearer mwt_live_YOUR_KEY' \
  -H 'Content-Type: application/json' \
  -d '{"falling_object":"skydiver_belly","medium":"air_sea_level"}'
```

## Response envelope

```json
{
  "request_id": "01K...",
  "tool": "terminal-velocity-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 Terminal Velocity Calculator API do?

Terminal velocity from mass, drag coefficient, area, and fluid density, with object presets and approach-time milestones. 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.