Currency Crosses Explained (Without the Caveman Hassle)
Long ago, if you wanted to exchange one currency for another, you had to go through the U.S. dollar first.
Let’s say you had British pounds and wanted Japanese yen—you couldn’t just swap them directly. Instead, you'd first convert pounds into U.S. dollars, and then convert those dollars into yen.
The U.S. dollar was like the middleman of global currency exchanges. That’s why it was called a "vehicle currency"—it served as the go-between for most international transactions.
Enter: Currency Crosses 💱
Thanks to currency crosses, we no longer have to involve the U.S. dollar every time. You can now exchange one currency directly for another.
Some popular currency crosses include:
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GBP/JPY
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EUR/JPY
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EUR/CHF
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EUR/GBP
How to Calculate Cross Rates (If You’re Curious)
Okay, fair warning: this next part involves numbers. It's not hard, but it’s not exactly a party either.
Most trading platforms do this math for you automatically these days. So you don’t have to learn it. But if you're the kind of person who likes to peek under the hood, this section is for you.
Let’s walk through how to manually calculate the bid (buying price) and ask (selling price) for a currency cross like GBP/JPY.
Step 1: Find the “legs” of the pair
To calculate GBP/JPY, we use:
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GBP/USD
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USD/JPY
Why? Because they both involve the U.S. dollar, which connects the two currencies we’re interested in.
Let’s say we have these prices:
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GBP/USD: 1.5630 bid / 1.5635 ask
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USD/JPY: 89.38 bid / 89.43 ask
Step 2: Do the math
To find the bid for GBP/JPY:
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Multiply the bid prices of GBP/USD and USD/JPY:
1.5630 × 89.38 = 139.70
To find the ask for GBP/JPY:
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Multiply the ask prices of GBP/USD and USD/JPY:
1.5635 × 89.43 = 139.82
And that’s it!
You’ve just calculated a cross rate. 🎉