New — Free & Open Source

CalcHub MCP — Indian Finance
for Any AI Agent

Quick Answer

Install the CalcHub MCP server and your AI (Claude Desktop, Cursor, Windsurf, ChatGPT Desktop) gets native access to 10+ Indian finance calculators — EMI, SIP, tax, FD, PPF, HRA, capital gains, GST. Free and open source.

Install in 30 seconds

Add this to your Claude Desktop config (~/Library/Application Support/Claude/claude_desktop_config.json) and restart the app:

{
  "mcpServers": {
    "calchub": {
      "command": "npx",
      "args": ["-y", "@calchub/mcp-server"]
    }
  }
}

Tip: click anywhere inside the code block to select it, then copy.

Claude Desktop

~/Library/Application Support/Claude/claude_desktop_config.json

Cursor

~/.cursor/mcp.json

Windsurf

~/.codeium/windsurf/mcp_config.json

Cline (VS Code)

Cline MCP settings UI

What You Can Ask

Calculate EMI for a ₹50 lakh home loan at 8.5% for 20 years.

→ calculate_emi

If I SIP ₹25,000/month at 12% for 15 years, what's the maturity?

→ calculate_sip

How much tax do I owe on ₹18L under the new regime for FY 2026-27?

→ calculate_income_tax_new_regime

I'm 32, want to retire at 55, current monthly expense ₹1L — what corpus and SIP do I need?

→ calculate_retirement_corpus

How much HRA can I claim if basic is ₹6L, HRA ₹3L, rent ₹2.4L in Mumbai?

→ calculate_hra_exemption

What is the current RBI repo rate and the top home loan rates?

→ get_current_rates

10 Tools Included

calculate_emi

Monthly EMI for any loan with full amortization math.

calculate_sip

SIP maturity value, total invested, wealth gained.

calculate_fd

Fixed Deposit maturity with configurable compounding.

calculate_income_tax_new_regime

New Regime FY 2026-27, rebate u/s 87A, ₹75k standard deduction.

calculate_ppf

PPF maturity at current 7.1% rate.

calculate_hra_exemption

Section 10(13A) exemption, metro/non-metro rules.

calculate_capital_gains_equity

STCG 15% / LTCG 12.5% above ₹1.25L on listed equity.

calculate_gst

GST exclusive and inclusive modes, all CBIC slabs.

get_current_rates

RBI repo, top home loan, FD, IT slabs, GST, PPF — live snapshot.

calculate_retirement_corpus

Inflation-adjusted corpus + monthly SIP required.

Why CalcHub MCP?

  • •Real Indian rules — New Regime FY 2026-27, ₹12L rebate u/s 87A, LTCG ₹1.25L exemption, PPF 7.1%.
  • •Every answer ships with the formula, the source, and a disclaimer — auditable.
  • •Zero telemetry, zero network calls at runtime — 100% local math over stdio.
  • •Free forever, MIT licensed, open source.
View on npm →View on GitHub →

Not financial advice. Rates snapshot: 2026-04-01 (FY 2026-27).