We do not hide the method

The live figure is an estimate, not a measurement

A number ticking upward on screen creates the illusion that a meter somewhere is measuring that instant in real time. It is not. National debt, GDP, household credit, and population are not published every second. National debt tends to arrive once a year, GDP and household credit each quarter, and the population projection annually. The time between releases is empty, and that gap is what we fill.

WorldRealDebt takes the most recent official snapshot as a base value and stretches the published annual growth rate along the time axis to bridge the interval. The formula is a simple compound interpolation: value(t) = base × (1 + g)^t, where t is the elapsed time in years since the base date, and both base and g are taken directly from the official sources this site has chosen. Both values refresh at the next release.

So the figure shows you where things stand, but it cannot claim to equal a confirmed print for any single instant. The point of a debt clock is not to replace official statistics. It is to give a sense of time to numbers that would otherwise sit frozen between releases.

Source policy — primary releases first, institutions for context

Every indicator uses each country’s official fiscal and statistical release as its primary source. Korea draws on the Ministry of Economy and Finance Open Fiscal Data (national debt), the Bank of Korea ECOS (household credit, GDP, balance of payments), Statistics Korea KOSIS (population, prices), and the Korea International Trade Association K-stat (exports and imports). Japan relies on the Ministry of Finance and the Cabinet Office; the United States on the Treasury, the Bureau of Economic Analysis, and the Congressional Budget Office; China on the Ministry of Finance and the National Bureau of Statistics; Spain on the Banco de España, the INE, and Eurostat.

The IMF Global Debt Database, the World Bank, and the BIS are supporting sources only. They are attached to add cross-country context, never to replace a headline number. Each card names the institution and series a value comes from, and primary and supporting sources are kept visually distinct.

Vintage policy — every value is stamped with a date

Statistics have a release date. Even the same “2023 national debt” differs between a provisional and a final print, and a later vintage can revise an earlier one after the fact. That is why every indicator on this site carries an asOf field: a marker that pins which reference month’s official release the value came from.

We also make the differing cadences visible. Debt updates annually or quarterly, GDP quarterly, and population annually. Cards and source tables follow a labelling convention — “Base: <source> <reference month> + live interpolation” — so a reader can judge for themselves how much interpolation has been laid on top of which snapshot.

Confidence tiers — official, estimate, proxy

Not every indicator carries the same weight. Some values are confirmed prints from an agency; some are interpolated by us between releases; and some, lacking a direct statistic, stand in with the nearest available proxy. To avoid hiding those differences, this site tags each item with a confidence tier.

Official means a figure formally released by an official body. Estimate means a value interpolated from an official snapshot by applying a growth rate. Proxy means an approximation made with the conceptually closest stand-in where no exact primary statistic exists. A lower tier signals wider variation across institutions and dates, so for anything that matters, follow the source under each card and read the primary data yourself.

Relation to international standards — the trap of simple ratios

The single phrase “national debt” nests a different perimeter in each country. Korea’s national debt alone has three layers. D1 is the direct debt of central and local government, the narrowest measure; D2 adds non-profit public institutions to reach general government debt; D3 folds in non-financial public corporations for the broadest reading. Which layer you pick moves the ratio to GDP visibly.

Cross borders and the definitions diverge further. Japan’s headline is Ministry of Finance central government (CG) debt, which is not the same concept as the general government (GG) debt that fills IMF tables. China runs only the official balance in its Ministry of Finance accounts as the headline and does not fold in LGFVs or hidden debt, where estimates vary widely by institution. Placing two countries’ debt-to-GDP ratios side by side for a simple comparison is therefore risky. Rather than inflate the headline, we surface first what a number includes and what it leaves out.

Limitations and disclaimer — cite a pinned snapshot

An interpolated estimate is not a confirmed print. The on-screen value refreshes every instant and can be revised retroactively once the next final figure lands. So when you quote a number in an article or paper, it is safer to record a pinned snapshot and its source than to screenshot a moving figure.

A public API exists for exactly this. Each country’s /api/<country>/snapshot.json returns a response fixed to a single instant, carrying baseAsOf (the reference date), meta (per-series source and confidence), and citeAs (a recommended citation string). Copy those fields and your reference becomes reproducible. Treat this site as a companion that adds a sense of time to otherwise frozen official statistics — never a replacement for them.

Corrections policy — errors are logged, not hidden

Publishing the method means publishing the mistakes too. When we find a problem that affects a value — a misattributed source, a wrong reference date, an error in applying a growth rate — we do not quietly overwrite it. We record what changed and how on the corrections page (/corrections).

Readers who spot an error can report it through the same channel. Honest source disclosure and a correction history are exactly what separate us from competing products, and the foundation of trust that can withstand being cited by the press.