Finance & investing
Gold prices, currency conversion and compound growth – money calculations with the formula and data source shown.
4 tools
Work out what gold is worth in USD from the live international spot price: 24K, 22K, 18K and 14K, per gram, kilogram or troy ounce, with dealer premium, fees, making charge and sales tax as separate lines.
Convert between 31 major currencies, including USD, at the daily reference rate. The source, publication date and any delay are shown, and you can type your own rate if the lookup fails.
See how an initial investment plus monthly contributions grows with monthly or yearly compounding, year by year, and how long it takes to double (rule of 72).
Monthly principal and interest for a fixed-rate mortgage, plus your own estimates for property tax, homeowners insurance, PMI and HOA dues, with a yearly amortization table.