Every site gives a different P/E ratio, so I open-sourced the math

Name: Every site gives a different P/E ratio, so I open-sourced the math
Availability: InStock
Author: JerBouma

by JerBouma·Jun 26, 2026·1 point·0 comments

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AI Analysis

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Every formula visible in source when Yahoo Finance and Morningstar hide their calculations.

Strengths

•Transparent formulas eliminate black-box calculation discrepancies across providers
•Documents the exact P/E ratio problem with eight different values for same company
•MCP server integration enables AI agent access to financial data

Weaknesses

•Python-only limits adoption compared to web-based financial terminals
•Still requires users to understand which metric variant suits their analysis

Post Description

Microsoft's P/E on May 6, 2023: Stockopedia says 28.93, Morningstar 32.05, Macrotrends 32.66, Yahoo Finance 33.80, Companies Market Cap 34.4. Same company, same date, eight different numbers. The usual causes: trailing-twelve-month vs fiscal-year-end earnings, diluted vs basic shares, different treatment of extraordinary items. Most providers don't document which they use. In the meantime, I report it at 32.07 (diluted), 31.96 (non-diluted), 30.07 (TTM diluted) and 29.93 (TTM non-diluted).

That is why I built the Finance Toolkit: an open-source (MIT) Python library where every one of 200+ metrics has its formula in the source. Entirely free to use and includes a MCP server as well.

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