Multi-Currency Converter

Formula and Rate Data

All cross-currency rates are derived from USD-based snapshots using triangular arbitrage to ensure consistency:

Cross-Rate Derivation

rate(X → Y) = USD→Y ÷ USD→X

Manual Override

converted = amount × customRate

Bank Rate with Markup

bankRate = midMarketRate × (1 + markup/100)

Hidden Fee

fee = amount × (bankRate − midMarketRate)

Embedded Rate Snapshot (per 1 USD)

Real-World Currency Conversion Scenarios

Three everyday situations where knowing the difference between mid-market, bank, and card rates saves money.

Scenario 1: You're an indie developer in Indonesia invoicing in USD

You're based in Jakarta and invoice a US client $3,000/month. How much you actually receive in IDR depends on three choices:

• PayPal: Uses a retail exchange rate 2.5-3% below mid-market + 3.4% processing fee. You might lose $180-$210/month to hidden markup.
• Wise (TransferWise): Uses mid-market rate + flat 0.43% fee. Same $3,000, you keep 100% of the FX rate and lose $12.90/month to fees. That's a $190/month swing — $2,280/year just from choosing the right payment rail.
• Bank wire: Your local Indonesian bank (BCA) quotes "1 USD = 16,850 IDR" while mid-market is 17,120. On $3,000, that's 810,000 IDR ($47) lost to markup. Plus they charge a fixed 50,000 IDR ($3) incoming wire fee.

This tool's "Bank vs Mid-Market" comparison is built exactly for this scenario — plug $3,000 in, select USD→IDR, set bank markup to 2.5%, and see your hidden fee instantly.

Scenario 2: Traveling in Brazil with EUR and USD cards

You're a EU expat with a Portuguese bank account (EUR) and a US credit card. Prices in Brazil are in BRL (Reais). Here's what actually happens when you pay:

• BRL→EUR mid-market today: 6.32 BRL per EUR.
• Your EUR bank (MB Way card): Charges you 3% foreign transaction fee on top of a 2% markup on the FX rate. That's effectively 5% total cost.
• Your USD card (Chase Sapphire): No foreign transaction fee, but still charges Visa's currency conversion markup of 1%.
• Result: Paying R$100 with your EUR card costs €15.82 (€15.03 mid-market + 5% cost). Paying R$100 with your USD card costs $19.94 (≈€18.82 mid-market + 1%). So EUR card is better — even with its higher fee, because USD→BRL has a worse cross rate.

That's the thing about cross-currency spending: it's not just about fees, it's about cross-rate arbitrage. This calculator shows both — so you can compare EUR→BRL vs USD→BRL rates before every trip.

Scenario 3: Importing products from China to Brazil

You source industrial supplies from Guangzhou, paying in USD. Your customers in Brazil pay in BRL. Every fluctuation in USD/BRL hits your margins. An example:

• Your COGS: $50/item (paid in USD on import).
• Your sale price: R$399/item (in BRL).
• When USD/BRL = 5.20, your COGS in BRL = R$260. Margin = R$139 (35%).
• When USD/BRL = 5.80, your COGS in BRL = R$290. Margin = R$109 (27%).
• 60-currency movement (11.5%) erodes 8 percentage points of margin.

For importers, this isn't just a calculator — it's a risk-management tool. You can run break-even analysis: "If USD/BRL goes above X, I need to raise prices by Y% to maintain 30% margin."

Mid-Market, Bank, and Card Rates — What's the Difference?

You'll see three numbers here. They're all "correct" — but they answer different questions.

Mid-Market Rate

The mid-market rate is the midpoint between what banks pay to buy a currency and what they charge to sell it. It's the rate you see on Google Finance, XE.com, or your trading app. It's also the rate that Wise, Revolut, and TransferWise base their pricing on (they just add a small transparent fee on top).

Who actually gets this rate? Banks trading with each other (interbank market), currency exchanges at airports with "0% commission" (they build markup elsewhere), and fintech apps that hedge on your behalf. Individuals almost never get the pure mid-market rate.

Bank Rate (with markup)

Banks make currency exchange profitable by adding a spread to the mid-market rate. Typical markups:

Your Money Doesn't Actually Move — Usually

Here's a secret most banks won't tell you: when you "convert $3,000 to EUR", your money doesn't physically get sent to Europe. Your bank simply:

1. Debits your USD account $3,000
2. Credits your EUR account the converted amount
3. Net-settles with a counterparty bank at their mid-market rate at the end of the day

The markup they charged you (2-4%) is pure profit — because they're hedging at almost zero cost by matching their global books. This is why bank currency conversion is one of the most profitable revenue lines for retail banks.

Our Test Data

Every row below is computed live in your browser from the current rate data:

All cross rates satisfy the documented formula exactly, computed live in your browser on every page load. Bundled fallback snapshot dated 2026-10-15.

Frequently Asked Questions

Converting for one specific purchase? Work the trip itself out in the Fuel Cost Calculator and compare shelf prices per gram or per pack with the Unit Price Calculator.