.discount-calculator-wrapper {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
max-width: 800px;
margin: 0 auto;
color: #333;
line-height: 1.6;
}
.calc-container {
background: #fdfdfd;
border: 1px solid #e0e0e0;
border-radius: 8px;
padding: 30px;
box-shadow: 0 4px 6px rgba(0,0,0,0.05);
margin-bottom: 40px;
}
.calc-grid {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 20px;
}
@media (max-width: 600px) {
.calc-grid {
grid-template-columns: 1fr;
}
}
.input-group {
margin-bottom: 20px;
}
.input-group label {
display: block;
font-weight: 600;
margin-bottom: 8px;
font-size: 0.95em;
color: #2c3e50;
}
.input-group input {
width: 100%;
padding: 12px;
border: 1px solid #ddd;
border-radius: 4px;
font-size: 16px;
box-sizing: border-box;
transition: border-color 0.2s;
}
.input-group input:focus {
border-color: #3498db;
outline: none;
}
.calc-btn {
background-color: #27ae60;
color: white;
border: none;
padding: 14px 24px;
font-size: 16px;
font-weight: bold;
border-radius: 4px;
cursor: pointer;
width: 100%;
transition: background 0.2s;
}
.calc-btn:hover {
background-color: #219150;
}
.reset-btn {
background-color: #95a5a6;
margin-top: 10px;
}
.reset-btn:hover {
background-color: #7f8c8d;
}
.results-box {
background: #f8f9fa;
border-left: 5px solid #27ae60;
padding: 20px;
margin-top: 25px;
border-radius: 0 4px 4px 0;
display: none;
}
.result-row {
display: flex;
justify-content: space-between;
margin-bottom: 12px;
border-bottom: 1px solid #eee;
padding-bottom: 8px;
}
.result-row:last-child {
border-bottom: none;
margin-bottom: 0;
padding-bottom: 0;
}
.result-label {
color: #666;
font-weight: 500;
}
.result-value {
font-weight: 700;
font-size: 1.1em;
color: #2c3e50;
}
.result-value.big {
font-size: 1.5em;
color: #27ae60;
}
.content-section {
margin-top: 40px;
}
.content-section h2 {
font-size: 1.8em;
color: #2c3e50;
margin-bottom: 15px;
border-bottom: 2px solid #eee;
padding-bottom: 10px;
}
.content-section p {
margin-bottom: 15px;
}
.content-section ul {
margin-bottom: 20px;
padding-left: 20px;
}
.content-section li {
margin-bottom: 8px;
}
.formula-box {
background: #eef7fb;
padding: 15px;
border-radius: 4px;
font-family: monospace;
text-align: center;
margin: 20px 0;
font-size: 1.1em;
border: 1px dashed #3498db;
}
function calculateDiscount() {
var priceInput = document.getElementById("originalPrice").value;
var rateInput = document.getElementById("discountRate").value;
var taxInput = document.getElementById("salesTax").value;
// Validation
if (priceInput === "" || rateInput === "") {
alert("Please enter both the Original Price and the Discount Rate.");
return;
}
var price = parseFloat(priceInput);
var rate = parseFloat(rateInput);
var taxRate = taxInput === "" ? 0 : parseFloat(taxInput);
if (isNaN(price) || isNaN(rate) || price < 0 || rate < 0) {
alert("Please enter valid positive numbers.");
return;
}
// Calculation Logic
var discountAmount = price * (rate / 100);
var priceAfterDiscount = price – discountAmount;
// Tax Calculation (Tax is usually applied to the discounted price)
var taxAmount = priceAfterDiscount * (taxRate / 100);
var finalTotal = priceAfterDiscount + taxAmount;
// Display Results
document.getElementById("displayOriginal").innerText = "$" + price.toFixed(2);
document.getElementById("displaySavings").innerText = "-$" + discountAmount.toFixed(2);
document.getElementById("displayPreTax").innerText = "$" + priceAfterDiscount.toFixed(2);
document.getElementById("displayTax").innerText = "$" + taxAmount.toFixed(2);
document.getElementById("displayTotal").innerText = "$" + finalTotal.toFixed(2);
// Show result box
document.getElementById("results").style.display = "block";
}
function resetCalculator() {
document.getElementById("originalPrice").value = "";
document.getElementById("discountRate").value = "";
document.getElementById("salesTax").value = "";
document.getElementById("results").style.display = "none";
}
Discount Rate Calculator
Original Price:
–
You Save (Discount Amount):
–
Price After Discount:
–
Estimated Tax:
–
Final Payable Amount:
–
How to Calculate Discount Rate and Final Price
Calculating the discount rate or the final price of an item is a fundamental skill for smart shopping and inventory management. Whether you are a consumer trying to determine how much you save during a sale, or a retailer setting up promotional pricing, understanding the mechanics of discount calculations is essential.
A discount rate is the percentage by which the original price of an item is reduced. This calculator helps you determine the exact monetary value of that percentage (the savings) and the resulting price you will pay at the register.
The Discount Formula
To calculate the discounted price manually, you can follow this simple mathematical formula:
Savings = Original Price × (Discount Rate / 100)
Final Price = Original Price – Savings
Final Price = Original Price – Savings
If you need to calculate the Price After Tax, the formula expands slightly:
Tax Amount = Final Price × (Tax Rate / 100)
Total Payable = Final Price + Tax Amount
Total Payable = Final Price + Tax Amount
Example Calculation
Let's look at a realistic example. Suppose you want to buy a winter jacket with an original price tag of $150.00. The store is offering a 20% discount rate.
- Step 1: Find the Savings.
Multiply $150 by 20% (or 0.20).
$150 × 0.20 = $30.00. This is your savings amount. - Step 2: Subtract Savings from Original Price.
Subtract the $30 savings from the $150 original price.
$150 – $30 = $120.00. This is your price before tax. - Step 3: Add Tax (If applicable).
If your local sales tax is 8%, you calculate 8% of $120.
$120 × 0.08 = $9.60.
Total Cost: $120 + $9.60 = $129.60.
Common Discount Rate Scenarios
- Percentage Off: The most common type, where a specific percentage (e.g., 15%, 50%) is deducted from the list price.
- Fixed Amount Off: A specific dollar amount (e.g., "$10 off") is removed. While this calculator focuses on rates (%), you can determine the effective rate by dividing the discount amount by the original price.
- Double Discounts: Sometimes stores offer "Take an additional 10% off the sale price." In this case, you calculate the first discount, establish a new sub-total, and then apply the second discount rate to that new sub-total.
Why Calculate the Discount Rate?
Understanding how to calculate discount rates allows you to compare deals effectively. For example, is "$20 off a $100 item" better than "15% off"? By converting both to either a percentage or a dollar amount, you can instantly see that $20 off is a 20% discount, making it the better deal compared to 15%.