CPI Inflation Calculator

io.github.theluckystrikePublished by GitHub account theluckystrikev1.0.0Updated Nov 3, 2026

Inflation calculator with official BLS CPI 1913 to the latest month, raise vs inflation, SS COLA.

The publisher's own server: Calculator Tools MCP

VerifiedStreamable HTTPWeb executable

Server details

Identifier: io.github.theluckystrike/cpi-inflation-calculator-mcp
Transport: Streamable HTTP
Runtime: Web executable
Trust: Verified
Published: Nov 3, 2026

Security note

MCP servers receive tool arguments from a conversation and may perform external actions. Review what a server can do before you enable it, and give it only the access it needs.

The registry verified the GitHub account theluckystrike for this listing. That does not show the account is the product's maker.

SourceWeft's checks cover whether the listing is complete and the endpoint answered; they do not review the server's code or what its tools do.

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Overview

CPI Inflation Calculator's hosted MCP server (cpi-inflation-calculator-mcp.lipmichal.workers.dev); no sign-in required; Streamable HTTP; 5 tools.

No AI overview yet: these facts come from the registry entry and the server itself.

Endpoint: cpi-inflation-calculator-mcp.lipmichal.workers.dev
Last checked: Nov 3, 2026

Installation

In SourceWeft

Open CPI Inflation Calculator in the dashboard and add it to a workspace.
Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/io.github.theluckystrike%2Fcpi-inflation-calculator-mcp/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "cpi-inflation-calculator": {
      "type": "http",
      "url": "https://cpi-inflation-calculator-mcp.lipmichal.workers.dev/mcp"
    }
  }
}

README

cpi-inflation-calculator-mcp

An MCP server that gives an AI assistant the official U.S. Consumer Price Index from the Bureau of Labor Statistics, from 1913 to the latest published month, so it can adjust any dollar amount for inflation, report the current inflation rate, check whether a raise kept pace, and compute the Social Security COLA. It checks the BLS API live for months newer than its training data.

Hosted endpoint, no sign-in and no token:

Tools

Tool	What it does
`calculate_inflation`	Adjusts an amount between any two months (`YYYY-MM`) or years (`YYYY`, annual average) from 1913 to the latest month. CPI-U by default, or CPI-W or core CPI. Returns the adjusted amount, cumulative and average annual inflation, and the index values used.
`get_latest_cpi`	The latest CPI month from BLS with the 12-month change for CPI-U, core CPI and CPI-W, the 1-month change and the year-to-date change.
`get_inflation_rate`	Annual-average and December-to-December inflation for any year since 1914, plus the latest 12-month rate for the current year.
`compare_raise_to_inflation`	Nominal raise, inflation, real raise, the pay needed to keep pace and the gain or shortfall.
`calculate_social_security_cola`	The COLA from Q3 CPI-W with the statutory formula, with the index values behind it.

Every result has structured JSON, a plain-English summary, data_status (live or bundled, latest month), as_of, source (the BLS series) and more (a pay raise calculator on statewage.com).

What it knows that your model does not

CPI index values through September 2026 (CPI-U 336.940), with a live check for anything newer.
Inflation was 3.7% over the 12 months to September 2026 (CPI-U, not seasonally adjusted). Core CPI was 2.6%.
BLS published no October 2025 CPI. Data were not collected during the 2025 lapse in appropriations. The tools say so instead of inventing a value, and still use the official 2025 annual average (321.943, 2.6% inflation).
The 2027 Social Security COLA is 3.6%. The tool reproduces it from Q3 2026 CPI-W (average 328.746 against 317.265), and also reproduces 2023 to 2026.

Install

Claude.ai custom connector or ChatGPT developer mode

Add a custom connector and paste the URL. No token is needed.

Claude Code

claude mcp add --transport http cpi-inflation https://cpi-inflation-calculator-mcp.lipmichal.workers.dev/mcp

claude mcp add --transport http cpi-inflation https://cpi-inflation-calculator-mcp.lipmichal.workers.dev/mcp

Or run it locally:

Claude Desktop

Add this to claude_desktop_config.json:

json

{  "mcpServers": {    "cpi-inflation": {      "command": "npx",      "args": ["-y", "github:theluckystrike/cpi-inflation-calculator-mcp"]    }  }}

{  "mcpServers": {    "cpi-inflation": {      "command": "npx",      "args": ["-y", "github:theluckystrike/cpi-inflation-calculator-mcp"]    }  }}

Cursor

Add this to ~/.cursor/mcp.json:

json

{  "mcpServers": {    "cpi-inflation": {      "url": "https://cpi-inflation-calculator-mcp.lipmichal.workers.dev/mcp"    }  }}

{  "mcpServers": {    "cpi-inflation": {      "url": "https://cpi-inflation-calculator-mcp.lipmichal.workers.dev/mcp"    }  }}

VS Code

Add this to .vscode/mcp.json:

json

{  "servers": {    "cpi-inflation": {      "type": "http",      "url": "https://cpi-inflation-calculator-mcp.lipmichal.workers.dev/mcp"    }  }}

{  "servers": {    "cpi-inflation": {      "type": "http",      "url": "https://cpi-inflation-calculator-mcp.lipmichal.workers.dev/mcp"    }  }}

Node 20 or newer is needed for the local npx version. Optional: set BLS_API_KEY to a free BLS registration key for a higher live-data quota.

Example prompts

"What is $1,000 from 2000 worth today?"
"What is the current inflation rate, and what was core inflation?"
"What was inflation in 2025? Was any month missing?"
"My salary went from $60,000 in January 2025 to $63,000 now. Did I beat inflation?"
"How is the 2027 Social Security COLA calculated?"
"Convert $50 in 1970 to 2026 dollars using CPI-W."

Data sources

U.S. Bureau of Labor Statistics CPI series CUUR0000SA0, CWUR0000SA0 and CUUR0000SA0L1E, fetched from the BLS Public Data API on 2026-11-03, plus a live check on each call. The COLA rule is 42 U.S.C. 415(i). See DATA_SOURCES.md.

Limitations

General information, not financial advice.
U.S. city average, not seasonally adjusted. No regional or item-level indexes (food, rent, gas).
The keyless BLS API caps daily requests per IP address. When the cap is hit, the hosted server answers from bundled data through September 2026 and says so in data_status.
Periods with no annual average yet (the current year) use the latest month of that year, with a note.

Check a raise after taxes with the pay raise calculator and the Social Security tax calculator on statewage.com.

Part of the Zovo MCP collection: https://mcp.zovo.one

Development

src/core.ts holds the CPI math and has no I/O. src/data.ts is the bundled BLS data. src/live.ts checks the BLS API for newer months. src/stdio.ts is the local entry and src/worker.ts is the Cloudflare Worker entry. Both use the same tool registry in src/tools.ts.

License

MIT

More data servers from the same author

Each one is free, needs no API key and has a hosted URL you can paste into Claude or ChatGPT.

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The paid back-office collection (invoices, VAT, PDFs, spreadsheets) is at https://mcp.zovo.one

Source: README.md at commit 005d1e7

Tools

calculate_inflation

Inflation calculator (CPI, 1913 to latest month)

Adjusts a dollar amount for inflation between any two periods from 1913 to the latest month the U.S. Bureau of Labor Statistics has published, using the official CPI-U (or CPI-W or core CPI). Checks the BLS Public Data API live for months newer than its bundled data (bundled through September 2026, fetched 2026-11-03), so it knows CPI figures newer than a model's training data. Handles the October 2025 gap: BLS published no October 2025 CPI because of the 2025 lapse in appropriations. Returns the adjusted amount, cumulative and average annual inflation, and the exact index values used.

Parameterstofromrequiredamountrequiredseries

get_latest_cpi

Latest CPI release (live from BLS)

Returns the most recent CPI index values published by the Bureau of Labor Statistics, checked live against the BLS Public Data API: the latest month, the 12-month inflation rate for headline CPI-U, CPI-W and core CPI (less food and energy), the not seasonally adjusted 1-month change, and the year-to-date change. Use it to answer 'what is inflation right now'. If the live check fails it says so and falls back to bundled BLS data (through September 2026).

Takes no parameters.

get_inflation_rate

Annual inflation rate for a year

Returns the official U.S. inflation rate for a calendar year from BLS CPI data: annual-average change (BLS annual averages, including the 2025 average published despite the missing October 2025 index), December-to-December change, and for the current year the latest 12-month rate. Years 1914 to the present for CPI-U and CPI-W, 1958 onward for core CPI.

Parametersyearrequiredseries

compare_raise_to_inflation

Did a pay raise beat inflation?

Compares a pay change with CPI inflation over the same period using official BLS data through the latest published month (checked live). Returns the nominal raise, inflation, the real (inflation-adjusted) raise, the pay needed to keep pace, and the gain or shortfall. Works for salaries, hourly wages, rents or any recurring amount.

Parameterstofromrequiredseriesnew_payrequiredold_payrequired

Version history

v1.0.0LatestNov 3, 2026

Score

100% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.