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Complete Guide to Discount Calculations
Free Online Discount Calculator
Our discount calculator helps you quickly determine the final price after a discount, compare multiple deals, calculate the original price before a sale, and even figure out tax on discounted items. All calculations happen instantly in your browser with detailed step-by-step explanations.
Calculation Types
🏷️ Simple Discount
Enter the original price and discount percentage to find the final price and how much you save.
🏷️🏷️ Double Discount
Apply two successive discounts (e.g. 30% off + extra 10%) and see the effective combined discount — which is never the simple sum.
🔍 Find Discount %
Know the original and final price? Find out exactly what discount percentage was applied.
💰 Find Original Price
Reverse-calculate the original price when you know the discount percentage and the sale price.
⚖️ Compare Deals
Compare two products with different prices and discounts to see which is the better deal.
🧾 Discount + Tax
Calculate the final price after both discount and sales tax, showing each component separately.
Essential Discount Formulas
Discount Amount = Original Price × (Discount% ÷ 100)
Final Price = Original Price − Discount Amount
Discount % = ((Original − Final) ÷ Original) × 100
Original Price = Final Price ÷ (1 − Discount%/100)
Double Discount = Price × (1 − D1/100) × (1 − D2/100)
Worked Examples
Example 1: 25% off a $120 jacket
Discount = $120 × 0.25 = $30. Final price = $120 − $30 = $90.00. You save $30.
Example 2: 30% off + extra 10% off on $200
After 30%: $200 × 0.70 = $140. After extra 10%: $140 × 0.90 = $126.00. Effective discount = 37%, not 40%!
Example 3: What was the original price if 20% off gives $80?
Original = $80 ÷ (1 − 0.20) = $80 ÷ 0.80 = $100.00.
Frequently Asked Questions
How do I calculate a discount?
Multiply the original price by the discount percentage divided by 100. Subtract that amount from the original price to get the final price.
Why isn't 30% + 10% equal to 40% off?
The second discount applies to the already-reduced price, not the original. So 30% off $100 = $70, then 10% off $70 = $63 — an effective 37% discount, not 40%.
Is tax calculated before or after the discount?
In most regions, sales tax is applied after the discount. You first reduce the price, then calculate tax on the discounted amount.
How do I find the original price from a discounted price?
Divide the final price by (1 − discount/100). For example, if something costs $75 after 25% off: $75 ÷ 0.75 = $100 original price.
🔒 Your Privacy Matters
All calculations happen directly in your browser — nothing is sent to any server. Your financial data stays completely private.