Currency Exchange Calculator

Convert between major world currencies. Includes bank spread cost estimator and round-trip conversion loss.

A currency exchange calculator converts an amount from one currency to another using the current mid-market exchange rate. It is used for travel budgeting, international transfers, import/export pricing, overseas property transactions, and comparing costs across countries. The mid-market rate (also called the interbank rate) is the midpoint between buy and sell rates used by banks — it is the fairest reference rate, but it is not the rate consumers receive from banks, travel money providers, or transfer services, all of whom apply a spread or fee on top. Loan Payment Calculator and Mortgage Calculator are useful for related international finance calculations.

Exchange rates fluctuate continuously during market hours, driven by interest rate differentials, inflation, trade balances, political events, and market sentiment. For large transactions, even a 1% movement in exchange rate can represent significant sums — making rate timing and currency risk management important. Specialist currency brokers typically offer significantly better rates than banks for transfers above a few thousand in local currency.

Enter the amount to convert.
Select the source currency and target currency.
The result shows the converted amount at the indicative mid-market rate.
For real transactions, subtract the provider's margin: banks typically 2–4%; specialist transfer apps 0.2–1%; travel money bureaux 2–5%; airport bureaux 4–8%.
For large international transfers, compare rates from specialist providers against your bank — the difference on a large transfer can exceed 1,000 in any currency.
For regular payments (overseas mortgage, international salary), consider a forward contract to lock in today's rate for future delivery.

Currency conversion formula

Converted amount = Source amount × Exchange rate (source → target)

Effective rate after spread = Mid-market rate × (1 − spread%/100)

True cost of conversion = (Mid-market rate − Effective rate) × Amount

Worked example: Converting 10,000 to a foreign currency at mid-market rate of 1.27. Result at mid-market: 12,700. Bank applies 2.5% spread: effective rate = 1.27 × 0.975 = 1.238. You receive 12,380. Hidden cost = 320. Using a specialist app at 0.4% fee: 12,649 received, total fee approximately 40 — a saving of approximately 280 on this transaction.

Understanding your exchange result

Provider spread comparison

Typical total cost (spread + fees) for a 10,000 currency conversion: high-street bank (branch) — 3–5%; bank online transfer — 2–3.5%; PayPal — 3–4%; travel money bureau (airport) — 4–7%; travel money bureau (pre-ordered online) — 1–2.5%; specialist transfer apps (Wise, Revolut) — 0.3–0.6%; specialist currency broker — 0.5–1% with no transfer fee above typical minimums. For transfers above 25,000, specialist brokers often provide dedicated support, forward contracts, and rate alerts that can add further value.

Finance tips and best practices

Never exchange currency at airport bureaux — airport rates are among the worst available; order travel money online in advance for much better rates.
Use a low or no-fee travel card abroad — cards that convert at or near the mid-market rate save 2.75–3% vs standard bank cards with foreign transaction fees.
For property purchases or large transfers, use a forward contract to lock in today's rate for delivery in 3–12 months, protecting against adverse rate movements.
Set rate alerts with your transfer provider — most offer free alerts when your target rate is hit, allowing you to transact at a favourable moment.
Always choose to pay in the local currency when using your card abroad — "dynamic currency conversion" offered by merchants gives a very poor rate; always select the local currency option.

Global daily foreign exchange turnover is approximately 7.5 trillion (BIS Triennial Survey, 2022) — the largest financial market in the world by volume.
Exchange rate movements of 10–20% over 12 months are common for major currency pairs — GBP/USD moved from approximately 1.03 to 1.43 over five years to 2024.
Specialist transfer services typically charge 0.3–0.6% on major currency pairs vs 3–5% at a high-street bank — the difference on a 50,000 transfer is approximately 1,200–2,300.
Foreign transaction fees on standard bank debit and credit cards are typically 2.75–3% per transaction — using a fee-free travel card eliminates this cost entirely.

Common mistakes to avoid

Assuming the rate shown on a currency data site is the rate you will receive — this is the mid-market rate; all providers add a spread or fee on top.
Accepting dynamic currency conversion (DCC) at ATMs or card terminals abroad — the merchant's rate is typically 3–7% worse than your card's conversion rate.
Converting currency in multiple steps (A → B → C) — each conversion adds a spread; always convert directly between currencies where a direct pair is available.
Not comparing providers for large transfers — the difference between a bank and a specialist service on a large transfer is typically 1–3% of the total amount.

Currency exchange and international money transfer services are regulated in most jurisdictions. Providers must typically be registered with the relevant financial regulator and comply with anti-money laundering (AML) regulations. Large international transfers may require documentation of the source of funds. Always verify that your currency exchange provider is properly authorised before transferring significant sums. Exchange rates and fees shown are indicative only. This calculator is for planning and informational purposes only and does not constitute financial advice.