AstroCalc

What it does

Ask an AI "what's my Moon sign?" and it will often guess. A kundli needs the exact positions of the planets at your birth, and a chatbot can't work those out in its head. Our connector lets it ask AstroCalc instead.

Technically it's a remote MCP server (Model Context Protocol, the open standard assistants use to call outside tools). In practice: you ask in English, Hindi or Hinglish, the assistant calls AstroCalc, and you get

• your birth chart in plain words (kundli): your core nature, the life phase you're in right now and when it changes, your standout strengths, and which life areas look strong;
• how well two people match for marriage (kundli milan): the score out of 36 and what each part means, cancellations applied, and a Manglik check for both;
• timing and perspective: what a life phase (dasha) means, how rare a yoga really is, and answers from our Learn chapters.

Same engine as the website: Swiss Ephemeris, sidereal zodiac, Lahiri ayanamsa. Every answer ends with a short caveat and a link to the full free report on astrocalc.in (charts, Hindi version, PDF). The connector only reads and calculates; it can't change anything.

Free, and what sign-in adds

Free, no account

• Kundli summary: Lagna, Moon sign, nakshatra
• Kundli milan with the full guna breakdown
• The dasha you're in now
• Yoga rarity ("1 in N charts")
• Answers from 117 Learn chapters
• The full chart with degrees and divisional charts (vargas)
• The dasha timeline over any span of years
• Transits on any date

With a free sign-in

• Your saved family kundlis, by name ("Mummy", "my son")
• Matches between saved people
• Family members compared side by side
• Today's outlook for anyone saved

The first time you ask about your saved profiles, your assistant asks you to connect your AstroCalc account: sign in with Google, read-only, no credits used.

The six tools

You never call these by name. Talk about yourself, your family or someone you know, a change you're going through, career or marriage timing, or a match; the assistant picks the right tool.

Tool	What you get	Try asking
Your birth chart, in plain words free_kundli	Lagna, Moon and Sun sign, nakshatra and pada, current Mahadasha and Antardasha with dates, top yoga with "1 in N charts", strong areas and areas that need care.	"Make my kundli: 14 Aug 1994, 6:40 am, Indore." "Meri kundli banao, 14 August 1994, subah 6:40, Indore."
How well two people match for marriage kundli_milan	Guna score out of 36 and what it means, all eight kootas with points, which doshas are cancelled, Manglik status for both.	"Match Riya (3 Feb 1996, 10:15 pm, Jaipur) and Arjun (21 Nov 1993, 7:05 am, Pune)." "Riya aur Arjun ki kundli milao, kitne gun milte hain?"
What life phase you're in, and what changes next explain_dasha	With birth details: your current Mahadasha and Antardasha with dates and what they're about for you. With just a planet: what that period means and how long it lasts.	"Which mahadasha am I in? Born 2 May 1991, 11:20 am, Lucknow." "Rahu ki mahadasha ka matlab kya hota hai?"
How rare a special chart combination is yoga_rarity	How common a yoga really is, from 5,000 sample Indian birth charts, plus a one-line meaning.	"Is Gaja Kesari yoga rare?" "Budhaditya yog kitna rare hai?"
Plain-language guides learn_answer	Up to three AstroCalc Learn chapters that answer your question, with a short summary and links, in English or Hindi.	"Is 24 gunas enough for marriage?" "Nadi dosh kya hota hai aur kab cancel hota hai?"
Find a birth place search_place	Matching cities and towns with coordinates, Indian places first. The assistant uses it when a name could mean two places.	"I was born in Aurangabad, Bihar, not Maharashtra." "Mera janm Aurangabad (Bihar) mein hua tha."

Don't know your birth time? Say so. We use 12 noon: your Moon sign and nakshatra stay right, and the answer tells you the Lagna is approximate.

Claude, step by step

Works on claude.ai, the desktop app and the mobile apps, on every plan (the Free plan allows one custom connector).

1. Open Settings > Customize > Connectors, then under Yours click + Add > Add custom connector (or use the "Add to Claude" button above, which fills this in).
2. Name: AstroCalc. MCP server URL: https://astrocalc.in/mcp. Click Continue.
3. Authentication: choose Sign in when needed (free tools work without signing in; sign-in is only for your saved kundlis). OAuth client: keep Use Claude's published identity (CIMD). Click Add.
4. Tool permissions start at "Needs approval". All AstroCalc tools only read, so you can set them to Always allow. In a chat, check AstroCalc is switched on under + > Connectors, then ask away.

Team or Enterprise plan? An Owner adds it once under Organization settings > Connectors > Add > Custom; everyone else then connects from Settings > Customize > Connectors.

ChatGPT, step by step

ChatGPT calls outside connectors Plugins now. You add one on chatgpt.com in a computer browser; we checked these steps on the Go plan. Workspace admins can turn custom servers off.

1. On chatgpt.com, open Settings > Integrations > Plugins, click Browse directory, then Add (top right) > Add custom MCP server.
2. Name: AstroCalc. Server URL: https://astrocalc.in/mcp. Authentication: leave OAuth (free tools work without signing in). Icon and description are optional.
3. Tick I understand and want to continue and click Create. In a new chat, open + and switch on AstroCalc if it isn't on.

ChatGPT renames its menus now and then (Plugins were called Apps, and before that Connectors); if a step looks different, search settings for "Plugins" or "MCP".

Gemini, step by step

Gemini takes outside tools through MCP in two places. Google changes these screens often, so if a step looks different, search Gemini's settings for "Connected apps" or "MCP".

• Gemini app (gemini.google.com): in Settings > Connected apps, choose Add a custom app and paste https://astrocalc.in/mcp. Right now Google offers custom apps only to accounts with Gemini Spark access, and they work inside Spark tasks. If you don't see the option, your account doesn't have it yet.
• Developer Mode (for testing): open gemini.google.com/devmode, then use Connect to an MCP server and enter the same URL.
• Gemini CLI: run gemini mcp add --transport http astrocalc https://astrocalc.in/mcp, or add the server to ~/.gemini/settings.json as shown below. Then run /mcp auth astrocalc if it asks you to sign in (optional).

{
  "mcpServers": {
    "astrocalc": { "httpUrl": "https://astrocalc.in/mcp" }
  }
}

Not possible in your Gemini yet? Use "Any other AI" above or keep using Claude or ChatGPT; the answers come from the same engine.

Other assistants

Any assistant that accepts a remote MCP server (also called a custom connector or custom app) can use AstroCalc. If yours has no one-click button above, open its connector or MCP settings and add this server. You can paste the message below straight into the chat too, if your assistant can add connectors for you:

Connect the AstroCalc MCP server: https://astrocalc.in/mcp (remote MCP, streamable HTTP; sign-in optional). Then ask me for my kundli.

The details to enter: server URL https://astrocalc.in/mcp, transport Streamable HTTP, authentication OAuth or none (sign-in is optional and only needed for saved profiles).

• Claude Code: claude mcp add --transport http astrocalc https://astrocalc.in/mcp
• Cursor, VS Code and other MCP apps: add a remote (HTTP) server. The "Cursor and others" button above copies this:

{
  "mcpServers": {
    "astrocalc": { "url": "https://astrocalc.in/mcp" }
  }
}

For testing, the MCP Inspector (npx @modelcontextprotocol/inspector) works with transport "Streamable HTTP" and the same URL. In the MCP Registry we're in.astrocalc/astrocalc.

Privacy

• The birth details your assistant sends (date, time, place) are only used to do the calculation, in memory. We don't store them, and no account is created.
• We note which tool was used, the assistant's name (for example "claude-ai") and the time, and keep daily counts per tool and assistant. Never your birth details. Like every website, our server also keeps standard access logs.
• If the same chart is asked for again, the answer may come from a short-lived memory cache (up to 24 hours).
• Your chat itself stays with your assistant's provider (Anthropic, OpenAI and so on), under their privacy policy.

The full version: Privacy Policy, "AI assistants".

Limits

• Free and read-only. It calculates and explains. It can't save charts, change anything or charge you.
• Fair use. About 60 requests a minute and 20 chart calculations an hour per connection, plus a shared hourly limit for all assistants together. If you hit one, the answer says how long to wait and links to the same thing on astrocalc.in.
• Dates from 1 January 1900 to today. Places come from our city list (Indian cities first), or give latitude and longitude.
• Not a prediction. This is traditional Vedic astrology for reflection, not medical, legal or financial advice. A guna score is one input, not a verdict on a relationship.

Support

Not showing up, a result that looks off, or a question about your data? Write to us; we reply within 24 to 48 hours.

Email: support@astrocalc.in

More help: astrocalc.in/support

Quick checks: the URL is exactly https://astrocalc.in/mcp. If the AstroCalc sign-in window doesn't open, allow pop-ups for your assistant and try again. Opening that URL in a browser brings you back to this page; that's expected.