# Calcupedia (remote · calcupedia.io)

2,400+ calculators and unit converters with exact results and a live calculator card in the chat.

- Trust score: 86/100 (high trust)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-07

## Components

- remote · `calcupedia.io`: 86/100 (this document), [markdown](https://verifymcp.io/servers/io-calcupedia-calcupedia/api-mcp.md), [page](https://verifymcp.io/servers/io-calcupedia-calcupedia/api-mcp)

## Channel facts

- Endpoint: `https://calcupedia.io/api/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.1`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-11-07.

- **Endpoint Security**: 80/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Nothing on it is marked destructive, but we can't show that an anonymous caller can only read: full credit needs the server to list at least one tool and every tool to be verifiably read-only. We use a best-effort check of tool names and descriptions to tell read-only tools from tools that change things, so some genuinely read-only tools may not get full credit. Names that start with a read verb (get, list, read, search and similar) and accurate readOnlyHint annotations help. Meet that to earn full credit, or require authorisation.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 79/100
  - 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 536 tokens (~107/item across 5 items; 4 tools + 1 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 93/100
  - Stability observed for 28 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 90/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 71% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 4 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 6 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.
  - Supports UI / widget rendering.

## Install

### How do I install the Calcupedia MCP server?

Calcupedia is a hosted endpoint at https://calcupedia.io/api/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http io-calcupedia-calcupedia 'https://calcupedia.io/api/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "io-calcupedia-calcupedia": {
      "url": "https://calcupedia.io/api/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "io-calcupedia-calcupedia": {
      "type": "http",
      "url": "https://calcupedia.io/api/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.io-calcupedia-calcupedia]
url = "https://calcupedia.io/api/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "io-calcupedia-calcupedia": {
      "type": "remote",
      "url": "https://calcupedia.io/api/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add io-calcupedia-calcupedia --url 'https://calcupedia.io/api/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  io-calcupedia-calcupedia:
    url: "https://calcupedia.io/api/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "io-calcupedia-calcupedia": {
      "Transport": "http",
      "Url": "https://calcupedia.io/api/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add io-calcupedia-calcupedia -t streamable-http -u 'https://calcupedia.io/api/mcp'
```

### Other

```json
{
  "mcpServers": {
    "io-calcupedia-calcupedia": {
      "type": "http",
      "url": "https://calcupedia.io/api/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-11-06 (score 86, 0)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-11-05 (score 86, +1)

No change was recorded against any check on this day. Stability & Change Management went from 83 to 87. That category is still filling its 30-day observation window: 25 days of observed history at the previous scan, 26 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-03 (score 85, +1)

No change was recorded against any check on this day. Stability & Change Management went from 77 to 80. That category is still filling its 30-day observation window: 23 days of observed history at the previous scan, 24 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-01 (score 84, +1)

No change was recorded against any check on this day. Stability & Change Management went from 70 to 73. That category is still filling its 30-day observation window: 21 days of observed history at the previous scan, 22 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-30 (score 83, +1)

No change was recorded against any check on this day. Stability & Change Management went from 63 to 67. That category is still filling its 30-day observation window: 19 days of observed history at the previous scan, 20 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-28 (score 82, +1)

No change was recorded against any check on this day. Stability & Change Management went from 57 to 60. That category is still filling its 30-day observation window: 17 days of observed history at the previous scan, 18 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-26 (score 81, +1)

No change was recorded against any check on this day. Stability & Change Management went from 50 to 53. That category is still filling its 30-day observation window: 15 days of observed history at the previous scan, 16 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-24 (score 80, +1)

No change was recorded against any check on this day. Stability & Change Management went from 43 to 47. That category is still filling its 30-day observation window: 13 days of observed history at the previous scan, 14 at this one. The score rises as the window fills, whether or not the server changes.

## MCP tools (4)

### `search_calculators` (~157 tokens)

Search calculators

Searches Calcupedia's 2,400+ calculators and unit converters by keyword (for example "mortgage", "bmi", "kg to lbs"). Returns matching calculators with their slug, category and page link; the top 3 also list their input keys, defaults and allowed values. Use it when the user wants a number worked out (a loan or mortgage payment, interest, savings, tax, salary, BMI, calories, a date or age, a percentage or a unit conversion) or asks for a calculator, then pass the slug to run_calculator.

Input parameters:

- `limit` (integer): Maximum results, 1-20. Default 10.
- `query` (string, required): Keywords for the calculator or conversion needed.

### `calculate` (~45 tokens)

Recalculate

Recalculates a calculator card after the user changes a value. Used by the card itself, not by the assistant.

Input parameters:

- `slug` (string, required)
- `values` (object, required)

### `run_calculator` (~145 tokens)

Run a calculator

Runs one Calcupedia calculator with its verified formulas. Returns every result, a link that opens the calculator with the same values, and the inputs it accepts with their current values. Use it for finance, health, math, date and unit-conversion questions that need exact figures the user can check. Input keys differ per calculator and are listed by search_calculators; omitted inputs use the calculator's defaults.

Input parameters:

- `inputs` (object): Input values keyed by input key, for example {"home_price": 400000, "interest_rate": 6.5}.
- `slug` (string, required): Calculator slug from search_calculators, for example "mortgage-calculator".

### `get_embed_link` (~103 tokens)

Get embed link

Returns the link where a website owner can style a Calcupedia calculator and get the code to embed it on their own site (WordPress, Shopify, Webflow, Wix or plain HTML). Customizing needs no account; creating the embed needs a free Calcupedia account. Use it when someone wants a calculator on their website, blog or online store.

Input parameters:

- `slug` (string, required): Calculator slug from search_calculators, for example "mortgage-calculator".

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/io-calcupedia-calcupedia/api-mcp#diagnostics

## Score history

- 2026-11-07: 86
- 2026-11-06: 86
- 2026-11-05: 86
- 2026-11-04: 85
- 2026-11-03: 85
- 2026-11-02: 84
- 2026-11-01: 84
- 2026-10-31: 83
- 2026-10-30: 83
- 2026-10-29: 82
- 2026-10-28: 82
- 2026-10-27: 81
- 2026-10-26: 81
- 2026-10-25: 80
- 2026-10-24: 80
- 2026-10-23: 79
- 2026-10-22: 79
- 2026-10-21: 79
- 2026-10-20: 78
- 2026-10-19: 78
- 2026-10-18: 77
- 2026-10-17: 77
- 2026-10-16: 76
- 2026-10-15: 76
- 2026-10-14: 75
- 2026-10-13: 75
- 2026-10-12: 74
- 2026-10-10: 73

## Common questions

### What is the Calcupedia MCP server?

Calcupedia is an MCP server listed in the public MCP registry as io.calcupedia/calcupedia. 2,400+ calculators and unit converters with exact results and a live calculator card in the chat. This page covers its hosted endpoint (https://calcupedia.io/api/mcp).

### Is the Calcupedia MCP server safe to use?

Calcupedia scores 86 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the Calcupedia MCP server expose?

Calcupedia exposes 4 tools: search_calculators, calculate, run_calculator, get_embed_link. Their descriptions and schemas cost roughly 450 tokens of context every time the server is loaded.

### Does the Calcupedia MCP server require authentication?

No. We connected to Calcupedia without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the Calcupedia MCP server still maintained?

Calcupedia is still listed as active in the MCP registry. We last reached this channel on 7 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

### What did VerifyMCP test on the Calcupedia MCP server?

VerifyMCP ran 14 checks on Calcupedia, covering TLS certificate, Authorization, HTTPS, HSTS header and 10 more. Supply Chain Security and Provenance & Transparency do not apply to a hosted endpoint, so they were not tested. The score does not measure everything, and the scoring documentation lists what it leaves out.

## Links

- Remote endpoint: https://calcupedia.io/api/mcp
- Website: https://calcupedia.io/mcp
- Changelog RSS feed: https://verifymcp.io/servers/io-calcupedia-calcupedia/api-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/io-calcupedia-calcupedia/api-mcp/changelog.json
- Trust report (JSON): https://verifymcp.io/servers/io-calcupedia-calcupedia/api-mcp.json
- HTML version of this page: https://verifymcp.io/servers/io-calcupedia-calcupedia/api-mcp