US Dollar Index (DXY) calculator
Work out the US Dollar Index from its six exchange rates with the published formula, and see how much each currency moves it. Free, no sign-up, nothing leaves your browser.
- 1Type in your own numbers
- 2The tool works it out
- 3See the answer clearly
The starting rates are only an example, not live prices. Enter today's rates to get today's index.
How the index is built
The US Dollar Index compares the dollar with six currencies: the euro, yen, pound, Canadian dollar, Swedish krona and Swiss franc. Each exchange rate is raised to a fixed weight and multiplied together with a constant, so the index started at 100 in March 1973. The euro carries about 58% of the weight, so EUR/USD moves the index most.
Reading the result
Above 100 means the dollar is stronger against the basket than in 1973; below 100 means weaker. Because the weights are fixed, the formula can rebuild the index from the six rates. Where the dollar is quoted second, as in EUR/USD and GBP/USD, the weight is negative: a higher EUR/USD means a weaker dollar.
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