Discount Calculator
Calculate final sale prices, total dollar savings, stacked coupons, and sales tax amounts.
Privacy First: 100% Client-Side Processing
Processed in your browser. Files are never uploaded.
How to Use the Discount Calculator – Sale Price & Savings
- 1Enter the original item price before any markdown.
- 2Enter the primary store discount percentage (e.g., 25%).
- 3Optionally add an extra coupon or member discount (e.g., 10% extra).
- 4Enter your local sales tax percentage to see the final payable amount.
Formula & How It Works
Discount & Stacked Markdown Formula
Primary savings equal Original Price × (Discount % / 100). If an extra stacked coupon applies, it discounts the already-reduced subtotal. Sales tax applies to the final discounted subtotal. For information only, not financial advice.
Worked Examples
25% Off Store Sale
Input: Original: $120.00, Discount: 25%, Tax: 7%
Explanation: $120 × 0.75 = $90 subtotal. $90 × 1.07 = $96.30 final price.
Stacked Clearance Markdown
Input: Original: $100.00, 40% off + Extra 20% coupon, 0% tax
Explanation: $100 × 0.60 = $60. Then $60 × 0.80 = $48. Total saved is $52 (52% effective discount, not 60%).
Half-Price Clearance
Input: Original: $50.00, 50% discount, 8% tax
Explanation: $50 × 0.50 = $25 subtotal. $25 × 1.08 = $27.00.
Modest 10% Member Promotion
Input: Original: $300.00, 10% discount, 5% tax
Explanation: $300 × 0.90 = $270. $270 × 1.05 = $283.50.
Frequently Asked Questions
How do stacked discounts work?▼
Stacked discounts apply sequentially rather than additively. A 40% discount followed by an extra 20% coupon equals a 52% total discount, not 60%.
Is sales tax calculated before or after the store discount?▼
In most jurisdictions, sales tax is calculated on the net discounted price paid by the customer, which our calculator reflects.
How do I calculate a 30% discount in my head?▼
Find 10% by moving the decimal point one place to the left, multiply by 3 to get 30%, and subtract that amount from the original price.
What is an effective discount percentage?▼
The effective discount percentage is the actual total percentage saved relative to the original price after all compounded markdowns are applied.
Does this tool constitute professional financial advice?▼
No. For information only, not financial advice. Calculations are mathematical estimates for planning purposes.
Does this tool work completely offline in my browser?▼
Yes, all discount calculations run locally in your web browser with zero server latency.
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