---
id: cpi
version: "2.0.10"
license: MIT
license_treatment: permissive
maintenance: active
---

# cpi — Quickly adjust U.S. dollars for inflation using the Consumer Price Index (CPI)

License: permissive · Maintenance: active · Downloads: 139.2K/mo

## What it is and what it does

CPI is a Python library for converting U.S. dollar amounts between different years using the Consumer Price Index, accounting for inflation. It lets you answer questions about what a dollar amount from one year is worth in another year by applying official CPI data to your calculations.

The package wraps CPI data into a simple API backed by requests, click, python-dateutil, and pandas. It's designed for quick, straightforward inflation adjustments in data analysis, financial reporting, or historical comparisons without needing to manually source or parse CPI tables yourself.

Use it for:

- Normalize historical salary or wage data to a common year for fair comparison across time periods
- Convert historical prices or costs to present-day equivalents for financial analysis or reporting
- Adjust historical budget figures or grant amounts to account for inflation when planning projects
- Build data pipelines that automatically inflation-adjust time-series economic data for analysis

## Worth the install?

AI-flagged interpretation of the facts above — verify before relying.

Adjusts U.S. dollar amounts for inflation using the Consumer Price Index, converting values to a target year's equivalent purchasing power.

Yes. The package is actively maintained, has no known vulnerabilities, uses permissive MIT licensing, and installs with low friction. It solves a common data-wrangling task (inflation adjustment) with a clean API. Install it if you regularly work with historical U.S. financial data or need to normalize dollar amounts across years.

## Install

pip install cpi
uv add cpi
poetry add cpi

## Installing cpi

Before you install: Low install friction with a pure-Python wheel and four common dependencies. Active maintenance with a recent commit on 2026-05-19 and stable production status.

License in practice: MIT license is permissive, allowing free use, modification, and distribution with minimal restrictions—suitable for both open-source and commercial projects.

Quickstart:

pip install cpi

import cpi

# Adjust dollars from one year to another
adjusted = cpi.inflate(amount, start_year, end_year)
print(adjusted)

Verify before relying:

- Whether the package fetches live CPI data or relies on bundled historical tables, and update frequency
- CLI interface capabilities and command syntax beyond the Python API
- Specific example values and year ranges supported by the inflate function

## Package facts

- License: MIT (permissive)
- Python support: unspecified
- Install friction: low
- Maintenance: active
- Downloads: 139.2K/month (top 15,000 on PyPI)
- Known vulnerabilities: none known

## Tags

inflation adjustment CPI, convert dollars for inflation, consumer price index calculator, historical dollar value, adjust currency inflation US, CPI inflation calculator, purchasing power adjustment, inflation, economics, data-wrangling

[View on SkillFed](https://skillfed.io/packages/cpi) · [View on PyPI](https://pypi.org/project/cpi/)