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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 0.89, multiply by the rate; to convert back, divide by it:
| Note | Result |
|---|---|
| 500 USD in EUR | €445 |
| 445 EUR in USD | $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:
| Note | Result |
|---|---|
| daily budget = 150 USD | $150 |
| trip length = 10 | 10 |
| trip cost = daily budget × trip length | $1,500 |
| trip cost to EUR | €1,335 |
At the illustrative rate of USD 1 = EUR 0.89, trip cost is $1,500, or €1,335 in euros. The app uses live rates. Notes Calculator pulls 200+ currency rates so you do not have to hard-code an FX number. Planning a whole trip, with hotel splits and daily spend in two currencies? The multi currency calculator for travelers walks through it on one page.
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:
| Note | Result |
|---|---|
| hourly rate = 85 USD | $85 |
| hours worked = 40 | 40 |
| subtotal = hourly rate × hours worked | $3,400 |
| subtotal in EUR | €3,026 |
The subtotal is $3,400, or €3,026 at the example rate. The live conversion can differ.
For more on billing international clients, see the freelance invoice calculator workflow.
Cross-Border Pricing
E-commerce businesses selling internationally need to price products in local currencies while maintaining their profit margins:
| Note | Result |
|---|---|
| product cost = 25 USD | $25 |
| target margin = 60% | 60% |
| usd price = product cost / (1 - target margin) | $62.50 |
| usd price in EUR | €55.63 |
| usd price in GBP | £46.88 |
At the stated example rates, $62.50 converts to €55.63 and £46.88. The app uses live rates when you calculate.
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 0.75:
| Note | Result |
|---|---|
| 1000 USD in GBP | £750 |
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 often offer poor rates, with markups well above the market rate. Better options include using a no-foreign-transaction-fee credit card, withdrawing from local ATMs, or converting online before your trip.
Convert Currencies in Notes Calculator
Notes Calculator supports 200+ currencies with live exchange rates: both fiat and crypto. Just use in, to, or as with currency symbols or codes:
| Note | Result |
|---|---|
| daily budget = $120 | $120 |
| trip days = 7 | 7 |
| trip cost = daily budget * trip days | $840 |
| // Convert to different currencies | |
| trip cost in € | €747.60 |
| trip cost in £ | £630 |
| trip cost in ¥ | ¥132,720 |
| // Crypto conversion | |
| 1 BTC in USD | $81,000 |
| 0.5 ETH in EUR | €1,068 |
| // International freelance invoice | |
| hourly rate = $95 | $95 |
| hours = 30 | 30 |
| invoice = hourly rate * hours | $2,850 |
| invoice in € | €2,536.50 |
You can use currency symbols ($, €, £, ¥, ₿) 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. Lines can mix currencies as well: addition gives the answer in the last currency you wrote, and subtraction keeps the first, so 5 EUR - 3 USD stays in euros. The docs list every supported code and sub-unit in the currency reference.
If you spend more time abroad than at a desk, our calculator for travelers shows how to keep a daily budget, split bills, and convert units on the road.
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.