# In Gold

> A deterministic sound-money calculator at https://www.ingold.au. Enter a dollar amount and a year and see what that money was actually worth — the gold it bought then, and the same amount rebased today by CPI, by money supply, and by gold. The thesis: the price of gold didn't get more expensive; the value of the dollar fell.

## Coverage

- US dollars: 1913–present (gold pegs $20.67/oz 1913–33 and $35/oz 1934–71, then market prices)
- Australian dollars: 1971–present (AUD gold derived from USD gold ÷ AUD/USD; the AUD floated December 1983)
- Live gold, silver, and platinum spot in USD and AUD, refreshed every five minutes

## Method

Gold weight = amount ÷ the gold price of that year. The three "today" figures rebase the same amount by CPI, money supply (M2 for USD, M3 for AUD), and gold spot. The engine is a deterministic lookup plus arithmetic — no estimates, no models, no AI in the number path. Annual averages. Not financial advice.

Key fact the calculator demonstrates: measured in gold, the US dollar has lost roughly 99% of its value since 1971 — it takes about one hundred times more dollars to buy the same ounce.

## Data sources

- US CPI: FRED CPIAUCNS (1913–present)
- US money supply: FRED M2SL (1959–present; gated off before 1959 — no fabricated data)
- Australian CPI: FRED AUSCPIALLQINMEI; Australian M3: FRED MABMM301AUM189S
- AUD/USD exchange rate: FRED DEXUSAL
- Historical gold: official US pegs + MeasuringWorth annual series
- Live spot (gold, silver, platinum): GoldAPI.io

## Per-year pages

Every year has its own page showing what $100 from that year is worth today across all three rulers, with historical context:

- `https://www.ingold.au/usd/{year}` — US dollars, 1913 onwards (e.g. /usd/1971)
- `https://www.ingold.au/aud/{year}` — Australian dollars, 1971 onwards (e.g. /aud/1983)
- Indexes: https://www.ingold.au/usd/ and https://www.ingold.au/aud/

## Reference pages

- https://www.ingold.au/1971 — pillar article: the closing of the gold window, with computed before/after figures
- https://www.ingold.au/aud-debasement — the Australian dollar measured in gold, 1971 to today (decade table)
- https://www.ingold.au/methodology — every formula and data series, peg history, determinism guarantees
- https://www.ingold.au/faq — fiat-vs-gold questions answered with exact figures
- https://www.ingold.au/glossary — definitions: debasement, fiat, gold window, Bretton Woods, M2/M3, spot, AUD float

## Free public API

- `GET https://www.ingold.au/api/calculate?amount=100&year=1971&currency=usd` — full calculation: gold weight then, today's CPI/M2/gold valuations, percent of dollar value lost measured in gold, and the year-by-year divergence series. `currency` is `usd` (year ≥ 1913) or `aud` (year ≥ 1971).
- `GET https://www.ingold.au/api/spot?currency=usd` — live gold, silver, and platinum spot with an `asOf` timestamp. `currency` is `usd` or `aud`.

Attribution appreciated: cite "In Gold (ingold.au)".