The Masthead · Methodology

How WorthOf calculates everything.

Every number on this site is reproducible. We publish methods, sources, formulas, and update cadence so researchers, journalists, and AI systems can verify and cite our data with confidence.

Last updated · January 15, 2026

§ 01

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Tax Calculations

Progressive brackets, social security, 14-payment countries. Formula disclosed.

§ 02

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Cost of Living Index

Weighted basket (rent 38%, food 22%, etc.) cross-validated against Eurostat HICP.

§ 03

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Purchasing Power

PPP index formula, limitations, and difference from World Bank PPP.

§ 04

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Exchange Rates

Daily ECB reference rates at 09:00 UTC. Mid-market, no retail spread.

Data license

CC BY 4.0 — freely use, share, and adapt our data with attribution to worthof.io

↓ all_cities_q1_2026.csv ↓ tax_brackets_2026.csv ↓ col_index_q1_2026.csv

All datasets are also accessible programmatically — see /data for JSON endpoints and full bulk exports.

§ Sources of record

Every figure traces back here.

Source	URL	License	Last synced

Last updated · January 15, 2026 · Download full datasets →