Hacé Cuentas — Free Calculators

Free calculators as MCP tools: finance, taxes, health, units, dates.

CommunityDegradedNo sign-inGlobalFreeRead-only

What it can do

    What data it sees

    Do you need an account

    No: the server works without sign-in

    Free calculators as MCP tools: finance, taxes, health, units, dates. Search, fetch & compute.

    How to connect

    How to connect Hacé Cuentas — Free Calculators to Claude

    The server address to paste into Claude settings:

    https://hacecuentas.com/mcp

    1. Open Claude (claude.ai or the desktop app).
    2. Go to Settings → Connectors.
    3. Click Add custom connector.
    4. Paste the server address copied below into Remote MCP server URL and click Add.
    5. In a chat, click + → Connectors and switch the new connector on.

    Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

    Authorization

    After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

    How to connect Hacé Cuentas — Free Calculators to ChatGPT

    The server address to paste into ChatGPT settings:

    https://hacecuentas.com/mcp

    1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
    2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
    3. Open Settings → Connectors and click Create.
    4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
    5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
    6. In a new chat open + → Apps/Connectors and enable the connector.

    OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

    Authorization

    On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

    How to connect Hacé Cuentas — Free Calculators to Cursor

    The server address to paste into Cursor settings:

    https://hacecuentas.com/mcp

    Fastest: click Open in Cursor below and confirm the prompt.

    Manually:

    1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
    2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
    3. Save the file. The server appears in the MCP list; authorize it there if asked.

    Authorization

    If the service needs sign-in, an authorize button appears next to the server in the MCP list.

    Server tool list (3)

    Raw names from tools/list. Only developers need these.

    search_calculatorsBusca calculadoras de Hacé Cuentas por palabra clave (ej. "imc", "préstamo", "aguinaldo"). Devolvé el slug para usar luego con get_calculator o compute. Opcional: filtrar por category y limitar resultados.
    get_calculatorDevuelve la ficha de una calculadora por slug: qué inputs toma (id, tipo, requerido, valores válidos) y una URL de ejemplo. Usalo antes de compute para saber qué parámetros pasar.
    computeCalcula el resultado de una calculadora en vivo. Pasá el slug y un objeto inputs con los campos (ver get_calculator). Opcional lang (es|en|pt). Devuelve el resultado calculado en JSON.