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# Log measurement

> Add a weight or body measurement for a day to the Measurements tab. Inputs, cURL, Python and Node.js examples and an example response.

Source: https://cotlet.dev/docs/api/fitatu/log_measurement

Docs sections: [Get started](https://cotlet.dev/docs.md) · [REST API](https://cotlet.dev/docs/api.md) · [MCP](https://cotlet.dev/docs/mcp.md) · [SDKs & CLI](https://cotlet.dev/docs/sdks.md) · [Integrations](https://cotlet.dev/docs/integrations.md)

Add a weight or body measurement for a day to the Measurements tab.

Fitatu API: https://cotlet.dev/docs/api/fitatu.md

`POST https://cotlet.dev/api/v1/fitatu/measurements`

Access: write. Confirm: waits for the user's OK before it runs.

Adds one entry to Measurements, such as weight, body fat or a circumference. Fitatu does not import weight from scales or other apps, so this is how a reading from a script reaches the chart. By default you confirm each call; you can switch that off for this tool.

## Parameters

| Name | Type | Required | Description |
|---|---|---|---|
| `type` | string | yes | Measurement type, e.g. weight, body_fat or waist. |
| `value` | number | yes | Value in the unit your account uses. |
| `date` | date | no | Day of the measurement, YYYY-MM-DD. Default: today. |

## Request

**cURL**

```bash
curl -X POST https://cotlet.dev/api/v1/fitatu/measurements \
  -H "Authorization: Bearer $COTLET_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"type":"weight","value":81.4,"date":"2026-10-13"}'
```

**Python**

```python
result = client.call("fitatu", "log_measurement", {"type":"weight","value":81.4,"date":"2026-10-13"})
```

**Node.js**

```js
const result = await cotlet.call('fitatu', 'log_measurement', {"type":"weight","value":81.4,"date":"2026-10-13"});
```

**CLI**

```bash
cotlet call fitatu log_measurement --data '{"type":"weight","value":81.4,"date":"2026-10-13"}'
```

## Example response

```json
{
  "measurement_id": "ms_2210",
  "type": "weight",
  "value": 81.4,
  "unit": "kg",
  "date": "2026-10-13",
  "status": "saved"
}
```

Previous: [Copy day](https://cotlet.dev/docs/api/fitatu/copy_day.md)

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Cotlet is an independent service. It is not affiliated with, endorsed by or sponsored by any of the products listed on this site. Product names are trademarks of their respective owners.

## For AI agents: sign your user up

Is your user asking you to sign them up for Cotlet? You can do it for them, no account or key needed.

1. Read the fields and their allowed values: GET https://cotlet.dev/api/v1/access-requests
2. Ask the user for each value: email, apps, what you will do with them. If they leave the password to you, generate a strong one and show it to them.
3. Show the user what you will send, then POST it as JSON to https://cotlet.dev/api/v1/access-requests.

One call creates the account and sends the access request; we email the user when access is granted.