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How Currency Conversion Works
Every currency has an exchange rate that expresses its value relative to other currencies. When you convert money, you multiply the amount by the exchange rate between the two currencies. Rates fluctuate constantly based on markets, central bank policies, and global trade.
Major Currency Pairs
The most commonly traded currency pairs involve the world’s largest economies:
| Pair | Name | Common Use |
|---|---|---|
| USD/EUR | Dollar to Euro | Transatlantic trade, travel |
| USD/GBP | Dollar to Pound | US-UK business, travel |
| USD/JPY | Dollar to Yen | Asian trade, investing |
| EUR/GBP | Euro to Pound | European business |
| USD/CAD | Dollar to Canadian Dollar | North American trade |
| USD/CHF | Dollar to Swiss Franc | Safe-haven investing |
Conversion Example
To convert $500 USD to Euros at a rate of 0.92:
500 × 0.92 = €460.00
To convert back: €460 / 0.92 = $500.00
Cryptocurrency Conversion
Cryptocurrencies like Bitcoin (BTC), Ethereum (ETH), and Dogecoin (DOGE) can also be converted to fiat currencies. Unlike traditional currencies, crypto prices can change significantly within hours.
Common Crypto Conversions
| From | To | Use Case |
|---|---|---|
| BTC → USD | Bitcoin to Dollars | Portfolio valuation |
| ETH → EUR | Ethereum to Euros | European trading |
| USDT → USD | Tether to Dollars | Stablecoin verification |
| SOL → USD | Solana to Dollars | DeFi valuations |
Common Currency Conversion Scenarios
Travel Budgeting
Planning a trip abroad means converting your budget into local currency:
daily budget = 150 USD
trip length = 10
total usd = daily budget × trip length
total eur = total usd to EUR
The right pane resolves total usd to 1,500 USD and total eur to whatever EUR rate is live (around 1,380 EUR at 0.92). Notes Calculator pulls 200+ currency rates so you do not have to hard-code an FX number.
International Freelancing
Freelancers working with international clients often need to quote in multiple currencies. If your rate is $85/hour and your client pays in Euros:
hourly rate = 85 USD
hours worked = 40
subtotal = hourly rate × hours worked
subtotal in EUR
The right pane resolves subtotal to 3,400 USD and the conversion line to the current EUR equivalent (around 3,128 EUR at 0.92).
For more on freelance billing, see our freelancer invoice calculator.
Cross-Border Pricing
E-commerce businesses selling internationally need to price products in local currencies while maintaining their profit margins:
product cost = 25 USD
target margin = 60%
usd price = product cost / (1 - target margin)
usd price in EUR
usd price in GBP
The right pane shows usd price as 62.50 USD and the EUR/GBP lines as their live equivalents (about 57.50 EUR and 49.38 GBP at 0.92 and 0.79).
Free Currency Converter
Convert between major world currencies with approximate exchange rates.
Rates are approximate and for illustration only. Notes Calculator uses live exchange rates.
©2026 Notes Calculator. All rights reserved.
Example
$1,000 USD to British Pounds at a rate of 0.79:
1,000 × 0.79 = £790.00
Frequently Asked Questions
How are currency exchange rates determined?
Exchange rates are set by the foreign exchange market based on supply and demand. Factors include interest rates, inflation, trade balances, political stability, and central bank policies. Most major currencies use floating exchange rates that change continuously during trading hours.
What is the difference between fiat and crypto currency conversion?
Fiat currencies (USD, EUR, GBP) are government-issued and relatively stable, changing by fractions of a percent daily. Cryptocurrencies (BTC, ETH) are decentralized and can swing 5-10% or more in a single day. Both can be converted using exchange rates, but crypto rates require more frequent updates.
Should I convert currency at the airport?
Airport exchange counters typically offer the worst rates, with markups of 5-15% over the market rate. Better options include using a no-foreign-transaction-fee credit card, withdrawing from local ATMs, or converting online before your trip.
For managing international finances, our compound interest calculator can help you plan savings in any currency. If you need to compare deals while shopping abroad, try the discount calculator.
Convert Currencies in Notes Calculator
Notes Calculator supports 100+ currencies with live exchange rates — both fiat and crypto. Just use in, to, or as with currency symbols or codes:
# Travel Budget
daily budget = $150
trip days = 10
total = daily budget * trip days
// Convert to different currencies
total in €
total in £
total in ¥
// Crypto conversion
1 BTC in USD
0.5 ETH in EUR
// International freelance invoice
hourly rate = $85
hours = 40
invoice = hourly rate * hours
invoice in €
You can use currency symbols ($, €, £, ¥, ₿) or ISO codes (USD, EUR, GBP, JPY, BTC). Variables and percentages work with currencies too — type invoice + 20% to add tax, or salary = 120k USD with large number notation.