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How to Calculate Currency Exchange

What is Currency Exchange?

A currency exchange calculator converts an amount between currencies using a mid-market rate, then models the bank spread and fixed fees applied by financial institutions to show what you actually receive.

Formula

Bank Rate = Mid-market Rate × (1 − Spread%)

Step-by-Step Guide

  1. 1Mid-market Rate = true interbank exchange rate
  2. 2Bank Rate = Mid-market Rate × (1 − Spread%)
  3. 3Amount Received = Amount × Bank Rate − Fixed Fee
  4. 4FX Cost = (Amount × Mid-market Rate) − Amount Received

Worked Examples

Input
$1,000 USD to EUR, rate 0.92, 2% spread
Result
Bank rate 0.9016, receive €901.60, cost $18.40
Input
£500 to USD, rate 1.27, 1.5% spread
Result
Receive $624.98 vs $635.00 at mid-market
Input
$500, 3% spread + $5 fixed fee
Result
Effective total FX cost = $20 (4% of amount)

Frequently Asked Questions

What is Currency Exchange?

A currency exchange calculator converts an amount between currencies using a mid-market rate, then models the bank spread and fixed fees applied by financial institutions to show what you actually receive. Use this calculator for accurate, instant results.

How accurate is the Currency Exchange calculator?

The calculator uses the standard published formula for currency exchange. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

What units does the Currency Exchange calculator use?

This calculator works with inches, percentages. You can enter values in the units shown — the calculator handles all conversions internally.

What formula does the Currency Exchange calculator use?

The core formula is: Mid-market Rate = true interbank exchange rate. Each step in the calculation is shown so you can verify the result manually.

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