MCPCalc — MCP Server

300+ calculators for AI agents via the Model Context Protocol.

MCPCalc is a hosted MCP server that gives AI agents (Claude, ChatGPT, and others) access to a comprehensive library of calculators spanning finance, math, health, construction, engineering, food, automotive, and more — including a full Computer Algebra System (CAS) and a grid-based Spreadsheet calculator.

🌐 Website: mcpcalc.com 📡 MCP Endpoint: https://mcpcalc.com/api/v1/mcp

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What is this?

MCPCalc is a remote MCP server. There is nothing to install — AI agents connect directly to the hosted endpoint. This repository contains the registry metadata and documentation for the server.

Connecting

Claude.ai

MCPCalc is available as a connector in Claude.ai. Search for "MCPCalc" in the MCP integrations menu.

Claude Desktop / Cursor / Other MCP Clients

Add the following to your MCP client configuration:

{
  "mcpServers": {
    "mcpcalc": {
      "url": "https://mcpcalc.com/api/v1/mcp"
    }
  }
}

No API key or authentication is required.

Agent usage guide: mcpcalc.com/api/v1/mcp/guide — includes examples and strict mode guidance.

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Available Tools

MCPCalc exposes the following tools to connected AI agents:

list_calculators

List all available calculators, optionally filtered by category.

Parameters:

• category (optional) — Filter by category: finance, math, health, construction, engineering, food, automotive, home, business, education, environment, pets, games, travel, date

get_calculator_schema

Get the input schema for a specific calculator.

Parameters:

• calculator (required) — Calculator slug (e.g., mortgage_payment, bmi, cas)

calculate

Run a calculation and get results.

Parameters:

• calculator (required) — Calculator slug
• inputs (required) — Calculator input values as key-value pairs
• strict (optional) — If true, reject invalid or unknown input fields

generate_prefilled_url

Generate a prefilled URL for a calculator without running the calculation. Useful for sharing.

Parameters:

• calculator (required) — Calculator slug
• inputs (required) — Input values for URL prefill

create_session

Create a new interactive session for any calculator. Returns a shareable session URL.

Parameters:

• calculator (required) — Calculator slug
• metadata (optional) — Session metadata

get_session_state

Retrieve current field values, computation transcript, and pending messages for an active session.

Parameters:

• session_id (required) — Session UUID

push_session_action

Push actions into a session's message queue — set fields, submit computations, trigger plots, and more.

Parameters:

• session_id (required) — Session UUID
• actions (required) — Array of action objects. Action types include:
  • submit_expression — Evaluate a math expression (CAS)
  • set_fields — Set form calculator field values
  • plot — Plot a function
  • assign_variable — Set a variable
  • insert_markdown — Insert commentary
  • clear_transcript — Clear history
  • set_mode — Switch between symbolic and numeric modes
  • set_cells — Set cell values by A1 references (Spreadsheet)
  • get_cells — Read cell values from A1 ranges (Spreadsheet)
  • clear_cells — Clear cell values in A1 ranges (Spreadsheet)
  • load_csv — Load CSV/TSV data into the grid (Spreadsheet)
  • export_csv — Export a range as CSV (Spreadsheet)
  • set_column_format — Set display formats by column letter (Spreadsheet)

close_session

Close a session and optionally persist a snapshot of its final state.

Parameters:

• session_id (required) — Session UUID

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Calculator Categories

Category	Count	Examples
Finance	55+	Mortgage, compound interest, 401(k), tax estimators, NPV, IRR, FIRE
Math	60+	Fractions, statistics, geometry, physics, chemistry, CAS, Spreadsheet
Health	25+	BMI, BMR, TDEE, macros, pace calculator, heart rate zones
Construction	35+	Concrete, lumber, drywall, electrical, plumbing, HVAC
Home & Garden	20+	Lawn, mulch, paint, lighting, solar savings
Food & Drink	25+	Recipe scaler, sourdough, cocktail scaler, macro calculator
Engineering	12	Gear ratio, torque, Reynolds number, stress/strain
Automotive	13	Fuel economy, EV range, horsepower, lease vs buy
Business	12	Freelance rate, SaaS metrics, A/B test, ROAS
Education	9	GPA, grade needed, college cost
Environment	9	Carbon footprint, solar ROI, water footprint
Date & Time	12	Date difference, work days, Unix timestamp
Travel	11	Tip calculator, currency converter, travel budget
Pets	7	Dog/cat food, pet age, aquarium size
Games & Hobbies	11	D&D dice, card odds, photography exposure

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The CAS (Computer Algebra System)

The cas calculator is a general-purpose computational math environment supporting:

• Symbolic algebra — simplify, expand, factor expressions
• Calculus — derivatives, integrals, limits, series
• Equation solving — symbolic and numeric
• Interactive plotting — function graphs with configurable ranges
• LaTeX input — natural mathematical notation
• Variable assignment — build up computations step by step
• Symbolic and numeric modes — switch between exact and approximate results

CAS Example via MCP

1. create_session(calculator: "cas")
2. push_session_action(session_id: "...", actions: [
     { type: "submit_expression", expression: "diff(x^3 * sin(x), x)" },
     { type: "plot", expression: "x^3 * sin(x)", range: [-10, 10] }
   ])
3. get_session_state(session_id: "...") → view results

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The Spreadsheet Calculator

The spreadsheet calculator is a grid-based computational environment (A–Z columns, 100 rows) supporting:

• Cell formulas — standard spreadsheet expressions with cell references
• Range operations — read, write, and clear cells by A1 notation
• CSV import/export — load and export tabular data programmatically
• Column formatting — set display formats per column
• Session-based — full state accessible via get_session_state

Spreadsheet Example via MCP

1. create_session(calculator: "spreadsheet")
2. push_session_action(session_id: "...", actions: [
     { type: "set_cells", cells: { "A1": "Item", "B1": "Price", "A2": "Widget", "B2": 9.99, "A3": "Gadget", "B3": 24.50 } },
     { type: "set_cells", cells: { "A4": "Total", "B4": "=SUM(B2:B3)" } }
   ])
3. get_session_state(session_id: "...") → read computed values
4. push_session_action(session_id: "...", actions: [
     { type: "export_csv", range: "A1:B4" }
   ])

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Architecture

MCPCalc is a fully hosted service. AI agents connect via the Streamable HTTP transport at https://mcpcalc.com/api/v1/mcp. No local installation, API keys, or environment variables are required.

AI Agent (Claude, ChatGPT, Cursor, Ollama, LM Studio, etc.)
    │
    │  MCP over Streamable HTTP
    ▼
MCPCalc Server (https://mcpcalc.com/api/v1/mcp)
    │
    ├── 300+ Form Calculators
    ├── CAS Engine (symbolic + numeric)
    └── Spreadsheet Engine (formulas, CSV, ranges)

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Links

• Website: mcpcalc.com
• MCP Registry: registry.modelcontextprotocol.io

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License

This repository contains registry metadata and documentation only. The MCPCalc service is proprietary software. See mcpcalc.com for terms of use.