Gold & Silver Return Calculator iBacktests historical price-only returns for the precious metals gold (monthly, World Gold Council GoldHub since January 1979) and silver (annual, USGS Mineral Commodity Summaries since 1968), with optional S&P 500 overlay and inflation adjustment.
How It Works — how does the gold and silver return calculator work?
Gold and silver are precious-metal commodities — physical assets quoted in US dollars per troy ounce. Unlike a dividend-paying stock, a commodity pays no income; every dollar of return comes from price change. We model the metal alone (not gold mining stocks, not gold ETFs); your only assumption is that one ounce purchased today is the same ounce a decade later.
Where gold comes from. Our gold series mirrors the World Gold Council (WGC) GoldHub Prices_Monthly dataset, derived from the London Bullion Market Association (LBMA) PM Fix. WGC publishes one value per month going back to January 1979, which is the start of the public monthly series. Redistribution is permitted with attribution under WGC Terms & Conditions; we attribute WGC in this Methodology panel, in the bundled JSON, and in the page footer. (See the Preview release note in the Methodology panel below for the current byte-provenance status.)
Where silver comes from. Our silver series mirrors the U.S. Geological Survey (USGS) Mineral Commodity Summaries (MCS) — an annual report published every January/February covering production, prices, and reserves for industrial minerals. USGS publishes one silver unit value per calendar year going back to 1968. USGS data is public domain under 17 U.S.C. §105 (works of the U.S. federal government are not subject to copyright). We chose USGS over commercial alternatives for license cleanliness and stability; the trade-off is annual cadence rather than monthly.
Why the cadences are asymmetric — and why we don't fake it. Gold renders as a smooth monthly line; silver renders as one data point per year, drawn as line segments between annual markers. We could have downsampled gold to annual to match silver, but that would actively destroy fidelity we already have (gold's intra-year movements like the August 2011 peak carry real information). We could have linearly interpolated silver up to monthly, but that would manufacture data points that don't exist — the "trough" of an interpolated curve is wherever the slope happened to land, not where silver actually traded. So we honor each source at its native cadence and disclose the asymmetry honestly. One consequence: silver's max-drawdown is computed at annual resolution and may under-report intra-year troughs that recovered before year-end.
Why we adjust for inflation. Over a multi-decade horizon, the dollar's purchasing power changes meaningfully. The CPI-U (Consumer Price Index for All Urban Consumers, published by the Bureau of Labor Statistics) is the standard US inflation measure. When the inflation toggle is ON, every dollar value on this page — the chart series, the headline end value, and the real return — is restated in the start year's dollars (the buying power of a dollar at the beginning of your selected period). This shows growth in real purchasing power. To convert any number on this page to today's dollars, multiply by the ratio CPI(today) / CPI(start-year).
How the S&P 500 overlay works. When the SPY toggle is ON, we plot the S&P 500 total-return index (with dividends reinvested) on the same chart, rebased to your investment dollar at the period start. This is the same data series our S&P 500 Return Calculator uses. The "vs S&P 500" output cell shows the percentage-point gap between your chosen metal's total return and the broad equity index over the same period — positive means the metal beat the market.
The formula is the price-only return formula: end price ÷ start price = total return ratio; cagr = (end/start)^(1/years) - 1; max drawdown = deepest peak-to-trough percent decline along the series. Numerical example: $10,000 in gold in January 2014 (~$1,244/oz) becomes about $20,000 in December 2024 (~$2,624/oz) — a total return of ~110% and a CAGR of ~7%. The same investment in silver from January 2014 (annual unit value ~$19) to 2024 (~$28) returns roughly $14,800 — a CAGR of ~3.5%, materially below stocks.
Why we include this. Gold and silver are precious-metal commodities. Unlike a dividend-paying stock, a commodity pays no income — every dollar of return comes from price change. Over multi-decade horizons their inflation-adjusted return has been much lower than a broad equity index, but their behavior in currency-stress and high-inflation regimes is materially different from stocks. We include this calculator so you can put real numbers on the long-run trade-off between commodities and dividend equities. Not investment advice.
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Methodology & data sources
Preview release iThis calculator's bundled price history was reconstructed from public reference points for the initial preview. The math is correct and the values are within authoritative-source rounding tolerance, but the bytes will be replaced with a live WGC + USGS fetch before public launch.. The bundled price history shipping with this calculator was reconstructed from publicly-known reference points (LBMA London Fix month-end values + USGS MCS annual unit values) for the initial preview release. Before the calculator goes live to the public, a maintainer will run our refresh script (scripts/refresh-commodities.mjs --upstream=live) to replace the bundled file with bytes fetched directly from the World Gold Council GoldHub Prices_Monthly dataset and USGS Mineral Commodity Summaries. The math, methodology, source attribution, and license posture are unchanged either way; only the byte-for-byte source of the historical price values changes.
Formulas
Total return: (end_price / start_price - 1) · 100% — price only; commodities pay no income.
CAGR: ((end_price / start_price)^(1/years) - 1) · 100%.
Max drawdown: deepest peak-to-trough percent decline along the series. Algorithm walks running peak, records minimum drawdown and the trough date.
Inflation deflation: when the inflation toggle is ON, every chart sample and the headline end value are restated in the buying power of a dollar at the period's start (CPI-U from BLS via /api/cpi). This matches the same convention used by our Stock Total Return calculator.
Data sources
- Gold price iThe World Gold Council's data portal (gold.org/goldhub) that publishes the LBMA London PM Fix as a downloadable monthly time series under WGC Terms & Conditions (redistribution permitted with attribution). The maintainer's refresh script targets the
Prices_Monthlyseries and bundles it into the calculator; the current preview build was seeded from public reference points and will be replaced with a live fetch before public launch. - World Gold Council GoldHub
Prices_Monthly, LBMA-derived month-end PM Fix, USD/oz. Will be downloaded fromgold.org/goldhub/data/gold-pricesbyscripts/refresh-commodities.mjs --upstream=livebefore production launch (current build ships preview-reconstruction bytes; see Preview release above). Monthly cadence from January 1979 onward. License: WGC Terms & Conditions — redistribution permitted with attribution. - Silver price iAn annual report from the U.S. Geological Survey covering production, prices, and reserves for industrial minerals including silver. Published annually in late January or early February. Public-domain data (federal-government work under 17 U.S.C. 105 — no copyright restriction).
- U.S. Geological Survey Mineral Commodity Summaries (MCS), silver chapter annual unit value, USD/oz. Will be downloaded by
scripts/refresh-commodities.mjs --upstream=livebefore production launch (current build ships preview-reconstruction bytes; see Preview release above). Public domain under 17 U.S.C. §105. Annual cadence from 1968 onward. - Gold reference
- The iThe London Bullion Market Association sets a daily reference price for gold and silver — the 'London Fix' — used by central banks, mints, and dealers worldwide. Our gold series is the WGC's monthly aggregation of LBMA fix data; our silver series is the USGS annual unit value (which is not directly the LBMA fix, but a USGS-curated annual reference that closely tracks the LBMA-derived market price). LBMA London Fix is the market reference WGC's monthly series is built on.
- Inflation iThe Consumer Price Index for All Urban Consumers — the U.S. government's standard inflation measure. Released monthly by the Bureau of Labor Statistics. Used here to restate dollar values in the start year's purchasing power.
- CPI-U from the U.S. Bureau of Labor Statistics, fetched via
/api/cpi. Same source as our Stock Total Return calculator. - Benchmark
- S&P 500 total-return index (dividends reinvested) via
/api/sp500-data; rebased to your investment at period start to match the headline end-value mental model. - Data updated iShows the date the bundled price file was last refreshed. The current build ships preview data; future builds will reflect the most recent refresh-script run against WGC and USGS upstream sources. If this date is more than 180 days old, our build will surface an error before deploying.
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Modeling notes
- Two distinct calendar start dates. The bundled price history starts at 1968-01-01 for single-asset Silver and 1979-01-31 for single-asset Gold. In Both mode, the period clamps to 1979-01-31 (the join point where gold's coverage begins; silver covers it). Single-asset Gold and Both share the same start because gold is the later-starting series.
- Annual cadence note iUSGS publishes silver prices once a year — there is no monthly silver series in the public-domain dataset. The calculator honors this honestly: silver is shown as one data point per year, not interpolated into fake monthly values.. Silver's max-drawdown is computed at annual resolution and may under-report intra-year troughs that recovered before year-end.
- Asymmetric series iBecause gold (monthly) and silver (annual) come from different public sources with different publication cadences, the chart shows them at their native resolutions. Gold appears as a smooth monthly line; silver appears as yearly markers connected by line segments.. Gold renders monthly; silver renders annual. We do not interpolate.
- SPY overlay (mirror of top-level toggle). When on, adds the S&P 500 total-return line to the chart, rebased to your investment at period start. Mirrors the toggle in the form above.
- Real-vs-nominal (mirror of top-level inflation toggle). When inflation adjustment is on, all values are deflated to the start year's purchasing power. Multiply by CPI(today) / CPI(start-year) to convert to today's dollars.
Limitations
- No taxes, no storage costs, no bid/ask spread, no fees.
- Gold history starts at 1979-01; pre-1979 gold prices exist (WGC publishes annual averages back to 1971) but are not shipped in this calculator.
- Silver is annual cadence by design (USGS publishes once a year).
- Log-scale and drawdown-overlay chart toggles are scheduled for Phase C alongside the chart-framework PR that implements those visuals.
Not financial advice. For informational and educational purposes only. Numbers come from public market data and may be stale. Always consult a licensed financial advisor before making investment decisions.