货币换算器
使用参考汇率在主要世界货币之间转换。
⚠ 参考汇率 — 不适合用于金融交易。
2025年中期参考汇率（以美元为基准）
货币转换器让您使用最新汇率在世界货币之间转换金额。无论是计划国际旅行、进行跨境购买、了解外国薪资，还是管理具有多币种收入的业务，此工具都能为您提供快速准确的转换。
从下拉菜单中选择源货币和目标货币，输入金额，即可立即计算转换后的值。汇率从可靠的金融数据源获取并定期更新，因此结果反映当前市场汇率。
请记住，显示的汇率是中间市场汇率（买入和卖出汇率的中间点）。银行、信用卡和兑换机构通常会在中间市场汇率基础上加收差价或费用，因此您实际换汇成本可能略高。
常见问题
代码实现
def convert_currency(amount, from_rate_to_usd, to_rate_to_usd):
"""
Convert amount between two currencies via USD as the base.
Rates are expressed as 'units per 1 USD'.
e.g. EUR/USD = 0.92 means from_rate_to_usd=1 (USD), to_rate_to_usd=0.92 (EUR)
"""
amount_in_usd = amount / from_rate_to_usd
return amount_in_usd * to_rate_to_usd
def build_rate_table(rates_vs_usd: dict, base="USD"):
"""
Build a cross-rate table from rates expressed against USD.
rates_vs_usd: {"EUR": 0.92, "GBP": 0.79, "JPY": 150.5, ...}
"""
if base != "USD":
base_rate = rates_vs_usd[base]
rates_vs_usd = {k: v / base_rate for k, v in rates_vs_usd.items()}
rates_vs_usd["USD"] = 1 / base_rate
def get_rate(from_ccy, to_ccy):
return rates_vs_usd[to_ccy] / rates_vs_usd.get(from_ccy, 1)
return get_rate
# Example rates (illustrative, not live)
rates = {"USD": 1.0, "EUR": 0.92, "GBP": 0.79, "JPY": 150.5, "CAD": 1.36}
get_rate = build_rate_table(rates)
amount = 1000 # USD
for ccy in ["EUR", "GBP", "JPY", "CAD"]:
converted = amount * get_rate("USD", ccy)
print(f"${amount} USD = {converted:,.2f} {ccy} (rate: {get_rate('USD', ccy):.4f})")
# Round-trip check
print(f"\nRound-trip: $1000 USD -> EUR -> USD = ${1000 * get_rate('USD', 'EUR') * get_rate('EUR', 'USD'):.4f}")
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