---
name: context-window-calculator
description: "Context Window Calculator (Context Window Calculator) via devops.majbase.com's free public API, no key required. Keywords: calculate context window size, how many tokens fit in context."
---

# Context Window Calculator

Context Window Calculator. Calls devops.majbase.com's free public API — no API key or authentication required.

## Endpoint

```
POST https://devops.majbase.com/context-window-calculator/api
```

## Request / Response

```
API: POST /context-window-calculator/api
  tokens=<int>         (required)
  model=<model id>     (required, see GET /context-window-calculator/ for valid ids)
Returns {"model", "context_window", "token_count", "fits", "remaining_tokens", "percent_used"},
or {"error": "..."}.
```

## Example

```bash
curl -sS -X POST https://devops.majbase.com/context-window-calculator/api -H "Content-Type: application/json" -d '{"tokens":120000,"model":"gpt-4o"}'
```

## Notes

- No API key or authentication required.
- Full interactive tool: https://devops.majbase.com/context-window-calculator/