Discount Calculator - Percent Off Price
Discount Calculator
A discount calculator saves you from mental math at the register and helps you compare deals across stores. It is especially useful during sales seasons when you need to quickly evaluate whether a "deal" is actually worth it.
Conversion Formula
Discount Amount = Original Price × Discount% / 100. Sale Price = Original - Discount. Tax = Sale Price × Tax% / 100. Final Price = Sale Price + Tax.
Step-by-Step Examples
$79.99, 25% off, 8% tax = Save $20.00, pay $64.79
79.99 × 0.25 = 20.00; 59.99 × 1.08 = 64.79
$200, 40% off, 0% tax = Save $80, pay $120
200 × 0.40 = 80; 200 - 80 = 120
$49.99, 15% off, 10% tax = Save $7.50, pay $46.74
49.99 × 0.15 = 7.50; 42.49 × 1.10 = 46.74
History
Retail discounts have existed since itinerant traders began negotiating prices. The modern percent-off sale was popularized by department stores in the late 19th century as a way to clear seasonal inventory and attract customers.
Common Use Cases
- Comparing Black Friday deals
- Evaluating clearance items
- Calculating coupon savings
- Budgeting for purchases with tax
Frequently Asked Questions
How do I calculate percent off a price?
Multiply the original price by the discount percentage divided by 100. For example, 25% off $80 = $80 × 0.25 = $20 off, so you pay $60.
How do I stack two discounts?
Apply discounts sequentially, not additively. A 20% then a 10% discount is not 30% off - it is 28% off. First: $100 × 0.80 = $80. Second: $80 × 0.90 = $72. Total discount = $28, not $30.
How is this different from dollar-off coupons?
A percent-off discount scales with the price, while a dollar-off coupon gives a fixed amount regardless of the original price. On expensive items, percent-off usually saves more; on cheap items, dollar-off coupons can represent a larger percentage.
Should I calculate tax before or after the discount?
Tax is always calculated on the discounted sale price, not the original price. Stores are required to apply discounts before calculating sales tax in most jurisdictions.