How Exchange Rates Work
Exchange rates represent the value of one currency expressed in terms of another. When EUR/USD is quoted at 1.0850, it means 1 Euro equals 1.0850 US Dollars.
Base and Quote Currency: In any currency pair, the first currency is the base and the second is the quote. The rate tells you how much quote currency you need to buy one unit of base currency.
- EUR/USD = 1.0850 means: 1 EUR buys 1.0850 USD
Bid and Ask: Real trading involves two rates—the bid (what buyers pay) and ask (what sellers receive). The difference is the spread, which represents transaction costs. This calculator shows mid-market rates, which are averages between bid and ask.
Converting for Trading Calculations
If your account currency differs from the instrument you’re trading, you’ll need currency conversion for:
- P&L Calculation
Your profit or loss is initially calculated in the quote currency, then converted to your account currency.
- Margin Requirements
Margin is often calculated in the base currency, then converted.
- Position Sizing
To risk a specific amount in your account currency, you may need to convert when trading non-native pairs.
Example:
Trading GBP/JPY with a USD account. Your profit is calculated in JPY, then converted to USD using the current USD/JPY rate.
Cryptocurrency Conversions
Cryptocurrency rates are highly volatile, sometimes moving more than 10 percent in a single day. When converting crypto:
- Rates can differ significantly between exchanges
- Large conversions may face slippage
- Always verify rates on your actual exchange before trading
- Consider transaction fees not reflected in spot rates
Major Currency Categories
G10 Currencies
USD, EUR, GBP, JPY, CHF, CAD, AUD, NZD, SEK, NOK. These are the most liquid currencies with the tightest spreads.
Emerging Market Currencies
MXN, ZAR, TRY, BRL, INR, CNY. Higher volatility, wider spreads, and potential liquidity issues.
Cryptocurrency
BTC, ETH, and altcoins. Extreme volatility, 24/7 trading, and exchange-dependent rates.
Related Trading Calculators
Currency conversion affects every calculation where your account currency differs from your instrument. Use these tools (or explore all trading calculators) to ensure pip values, margin requirements, and costs are all denominated correctly.