body {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
line-height: 1.6;
color: #333;
margin: 0;
padding: 20px;
background-color: #f4f7f6;
}
.calculator-container {
max-width: 600px;
margin: 0 auto;
background: #ffffff;
padding: 30px;
border-radius: 12px;
box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}
.calc-header {
text-align: center;
margin-bottom: 25px;
}
.calc-header h2 {
margin: 0;
color: #2c3e50;
font-size: 24px;
}
.form-group {
margin-bottom: 20px;
}
.form-group label {
display: block;
font-weight: 600;
margin-bottom: 8px;
color: #34495e;
}
.form-group input {
width: 100%;
padding: 12px;
border: 1px solid #bdc3c7;
border-radius: 6px;
font-size: 16px;
box-sizing: border-box;
transition: border-color 0.3s;
}
.form-group input:focus {
border-color: #3498db;
outline: none;
}
.form-row {
display: flex;
gap: 15px;
}
.half-width {
flex: 1;
}
.calc-btn {
width: 100%;
padding: 14px;
background-color: #27ae60;
color: white;
border: none;
border-radius: 6px;
font-size: 18px;
font-weight: bold;
cursor: pointer;
transition: background-color 0.3s;
}
.calc-btn:hover {
background-color: #219150;
}
.results-area {
margin-top: 25px;
background-color: #f8f9fa;
padding: 20px;
border-radius: 8px;
border-left: 5px solid #27ae60;
display: none;
}
.result-row {
display: flex;
justify-content: space-between;
margin-bottom: 10px;
font-size: 15px;
}
.result-row.total {
margin-top: 15px;
padding-top: 15px;
border-top: 1px solid #e0e0e0;
font-weight: bold;
font-size: 20px;
color: #2c3e50;
}
.content-article {
max-width: 800px;
margin: 40px auto;
background: #fff;
padding: 40px;
border-radius: 8px;
box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}
.content-article h2 {
color: #2c3e50;
border-bottom: 2px solid #ecf0f1;
padding-bottom: 10px;
margin-top: 30px;
}
.content-article p {
margin-bottom: 15px;
}
.formula-box {
background-color: #e8f6f3;
padding: 15px;
border-radius: 5px;
font-family: monospace;
margin: 20px 0;
}
.helper-text {
font-size: 12px;
color: #7f8c8d;
margin-top: 5px;
}
function calculateCurrency() {
// Get Input Values
var amount = parseFloat(document.getElementById('sourceAmount').value);
var rate = parseFloat(document.getElementById('exchangeRate').value);
var fixedFee = parseFloat(document.getElementById('transferFee').value);
var feePercent = parseFloat(document.getElementById('feePercentage').value);
// Validation
if (isNaN(amount) || amount <= 0) {
alert("Please enter a valid amount to convert.");
return;
}
if (isNaN(rate) || rate <= 0) {
alert("Please enter a valid exchange rate.");
return;
}
if (isNaN(fixedFee)) fixedFee = 0;
if (isNaN(feePercent)) feePercent = 0;
// Calculation Logic
// 1. Calculate Percentage Fee based on the source amount
var calculatedPercentFee = amount * (feePercent / 100);
// 2. Total Fees in Source Currency
var totalFees = fixedFee + calculatedPercentFee;
// 3. Net Amount remaining to be converted
var netAmount = amount – totalFees;
// Handle case where fees exceed amount
if (netAmount < 0) {
alert("Fees exceed the amount to transfer.");
return;
}
// 4. Convert Net Amount to Target Currency
var finalResult = netAmount * rate;
// 5. Calculate Real Effective Rate (What user actually gets per unit sent)
var realRate = finalResult / amount;
// Display Results
document.getElementById('displayAmount').innerText = amount.toFixed(2);
document.getElementById('displayFees').innerText = totalFees.toFixed(2);
document.getElementById('displayNet').innerText = netAmount.toFixed(2);
document.getElementById('displayRate').innerText = rate.toFixed(4);
document.getElementById('displayFinal').innerText = finalResult.toFixed(2);
document.getElementById('effectiveRate').innerText = realRate.toFixed(4);
// Show result section
document.getElementById('resultDisplay').style.display = 'block';
}
How to Work Out Exchange Rates
Whether you are traveling abroad, sending money internationally, or trading forex, understanding how to work out exchange rates is essential for managing your finances. The exchange rate determines how much value you get when converting one currency to another.
Understanding the Basics
An exchange rate represents the value of one currency in terms of another. For example, if the EUR/USD rate is 1.10, it means 1 Euro buys 1.10 US Dollars.
- Base Currency (Source): The currency you currently hold.
- Quote Currency (Target): The currency you want to buy.
The Calculation Formula
To calculate how much foreign currency you will receive, you generally multiply the amount of your home currency by the exchange rate provided. However, to get an accurate figure, you must also account for fees.
Net Amount = Source Amount – (Fixed Fees + Percentage Fees)
Final Received = Net Amount × Exchange Rate
For example, if you want to convert 1,000 units of currency and the bank charges a 10 unit fee with an exchange rate of 1.5:
- Subtract the fee: 1,000 – 10 = 990
- Multiply by the rate: 990 × 1.5 = 1,485 (Target Currency)
Inverse Exchange Rates
Sometimes you might need to know the reverse rate (how much of the Source currency equals 1 unit of the Target currency). You can work this out by dividing 1 by the exchange rate.
Formula: 1 ÷ Rate = Inverse Rate
If the rate is 0.80, the inverse is 1 ÷ 0.80 = 1.25. This means 1 unit of the target currency costs 1.25 of the source currency.
The "Real" Cost: The Spread
Banks often claim "zero commission" but hide the cost in the exchange rate itself. The "Interbank Rate" (the rate banks trade at) might be 1.20, but the bank might offer you 1.15.
To work out the hidden spread cost:
Spread Cost = (Market Rate – Your Rate) × Amount
Using the calculator above helps you see the Effective Exchange Rate, which combines all fees and rate differences to show you the true value of your conversion.