Methodology and data source
How guldgraf.dk gets its prices, how often they update, and how we convert spot prices into the value of your gold.
Data source
All prices on guldgraf.dk – live spot prices, intraday curves and the daily history back to 1999 – come from MetalflowAPI, a price data service for gold, silver, platinum and palladium.
Live prices are refreshed about every five minutes. Our server keeps a short cache, so pages load quickly, and if the data source is temporarily unavailable we show the last known price with its timestamp rather than an empty field.
Purity and karat math
Spot prices are quoted per troy ounce (31.1035 g) of pure metal. We divide by 31.1035 to get the price per gram and multiply by the fineness of the alloy:
- Value = spot price per gram × fineness/1000 × weight in grams
- Karat to fineness: karat ÷ 24 (e.g. 14 ÷ 24 ≈ 0.58333; stamped 585 = 0.585, 18 ÷ 24 = 0.750)
- Example: 10 g of 14 carat = 10 × 0.585 = 5.85 g pure gold
Prices in DKK are converted from euro at the live EUR/DKK rate (fallback: the ERM II central rate 7.46038).
What the historical calculations include
The historical series is a reference price series, not a reconstruction of every Danish dealer offer. EUR observations are multiplied by the current conversion factor when DKK or USD is selected. This preserves the source series’ price movements but does not reproduce historical exchange-rate movements. A result should therefore not be presented as the precise return a Danish investor would have earned over that period.
The displayed minimum, maximum and average describe available observations. A daily series cannot establish every intraday high. Exported chart points may be sampled for display and are not a complete transaction log. Missing observations should not be interpreted as a market price of zero. Compare the chosen unit, currency, date range and observation frequency before comparing two figures from different pages or providers.
Calculator results exclude gemstone values, retail premiums, buyer deductions, transport, storage and personal taxes unless an input explicitly models a cost. Payout percentages are scenarios, not verified offers. Use net alloy weight and the documented stamp: 417 means 0.417 and 916 means 0.916. Nominal karat fractions can differ slightly, so the fineness stamped on an item takes precedence in the fineness calculators.
Disclaimer
Prices are indicative and do not constitute an offer to buy or sell or investment advice. Buyers and dealers apply their own spreads; always get a written offer before trading.
Questions and answers
Where do the prices come from?
All spot prices and historical rates are provided by MetalflowAPI, which aggregates prices from the international precious metals markets.
How often are prices updated?
Live prices update roughly every 5 minutes and the site fetches new figures automatically. Daily history goes back to January 1999.
How are prices converted to Danish kroner?
Prices are retrieved in euro and converted to kroner with the current EUR/DKK rate. Historical EUR data uses the current factor, not the exchange rate on each historical date.
How is the price for a specific karat calculated?
The spot price per gram of pure gold is multiplied by the fineness. 14 carat (585), for example, is 0.585 × the spot price per gram.
Are the prices an offer to buy or sell?
No. The prices are indicative market prices. A buyer or dealer always applies a spread to the spot price.