MCPcalc
About
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
Details
- Author
- robrighter
- Downloads
- 264
- Categories
- AI
Jump to
- 300+ form calculators across 15 categories (finance, math, health, construction, etc.)
- Full Computer Algebra System (CAS) for symbolic algebra, calculus, and equation solving
- Interactive spreadsheet engine with cell formulas, CSV import/export, and range operations
- Session-based computation with state persistence and prefilled URL generation
- Streamable HTTP transport — no local installation, API keys, or environment variables required
Setting up with Highlight
This MCP is not yet compatible with Highlight’s one-click setup. However, you can still use it with Highlight by following these steps:
- Download and install Highlight from highlightai.com/download
- Navigate to the plugins tab and select "Add Custom Plugin"
-
Configure the plugin with the settings below
Plugin Name
MCPcalcCommand (node, npx, python, etc.)Please refer to the README for specific instructions on how to obtain API keys or other required environment variables.
- Enable "Start Automatically" if you want the plugin to start when Highlight launches
From the repository
Connect any MCP client (Claude Desktop, Cursor, etc.) by adding the URL https://mcpcalc.com/api/v1/mcp to the client configuration. No API key or authentication is required. For Claude.ai, search for "MCPCalc" in the MCP integrations menu. The agent usage guide is available at mcpcalc.com/api/v1/mcp/guide.
list_calculators
List available calculators, optionally filtered by category
get_calculator_schema
Get the input schema for a specific calculator
calculate
Run a calculation and get results + prefilled URL
generate_prefilled_url
Generate a prefilled URL without running calculation
calculate_cas
Evaluate one or more headless CAS expressions server-side (MCP-only numeric mode). Unsupported expressions return a GUI handoff link.
calculate_cas_headless
Alias of calculate_cas. Headless MCP-only CAS evaluator; if unsupported features are requested, returns GUI handoff details.
create_session
Create a new interactive session for any calculator and return the session URL
get_session_state
Retrieve the current field values, computation transcript, and pending message queue for an active session
push_session_action
Push actions into a session's message queue (set fields, submit computation, trigger plot, etc.)
close_session
Close a session and optionally persist a snapshot of its final state
Claude Desktop / Cursor
Paste into your MCP client config file to install this server.
{
"mcpServers": {
"mcpcalc": {
"mcpcalc": {
"url": "https://mcpcalc.com/api/v1/mcp"
}
}
}
}McpServers
{
"mcpcalc": {
"url": "https://mcpcalc.com/api/v1/mcp"
}
}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: ``json
{
"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.
---
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
---
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 |
---
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
`
---
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" }
])
`
---
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)
``
---
Links
- Website: mcpcalc.comSign in to leave a review
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