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Discount Calculator — Sale Price, Percentage Off & Total Savings
Calculate final sale prices, double stacked coupons, and tax-inclusive retail savings.
Discount & Retail Price Parameters
Discount & Final Sale Price Formula
Transparent mathematical methodology explained in plain English.
Final Price = [Original Price × (1 - Discount1) × (1 - Discount2)] × (1 + SalesTax) Applies primary discount and secondary stacked coupon reductions to original price, then calculates optional state sales tax on the discounted subtotal.
Variables Explained:
- Original Price: Full retail sticker price.
- Discount1: Primary sale percentage off.
- Discount2: Optional extra coupon or member discount.
- SalesTax: Local retail sales tax percentage.
$120 Item with 25% Off + 8.25% Sales Tax
Calculating final checkout price and net dollar savings.
- Discount amount: $120.00 × 25% = $30.00.
- Sale subtotal: $120.00 - $30.00 = $90.00.
- Sales tax: $90.00 × 8.25% = $7.43.
- Final price: $90.00 + $7.43 = $97.43.
- Total savings: $30.00.
Frequently Asked Questions: Discount Calculator
Click any question below to expand quick answers, formulas, and expert tips.
How do I calculate percentage discount and sale price?
Multiply the original price by the discount percentage (e.g., $80 × 25% = $20 discount), then subtract that amount from the original price to find the final sale price ($80 - $20 = $60).
How do stacked double discounts work (e.g., 20% off plus extra 15% coupon)?
Stacked discounts are applied sequentially, not added together. For a $100 item with 20% off ($80), the extra 15% coupon applies to $80 ($12 discount), yielding a final price of $68 (a 32% total reduction, not 35%).
Is sales tax applied before or after retail discounts?
In almost all states and jurisdictions, retail sales tax is applied to the discounted sale price at checkout, meaning discounts directly lower the sales tax you pay.
How do I calculate what percentage discount I received?
Subtract the sale price from the original price to find dollar savings, divide by the original price, and multiply by 100. For example, saving $30 on a $120 item is ($30 / $120) × 100 = 25% off.
How do I quickly calculate 30% off in my head?
Find 10% of the price by moving the decimal point one digit left, multiply by 3, and subtract that amount from the original price. For a $50 item, 10% is $5, 30% is $15, and the sale price is $35.
What is the difference between discount and markup?
A discount reduces an item's retail price by a percentage (e.g., 20% off $100 = $80). A markup increases wholesale cost to establish retail price (e.g., marking up an $80 wholesale cost by 25% equals $100).
How do "Buy One, Get One 50% Off" (BOGO 50%) sales compare to flat discounts?
BOGO 50% off on two identically priced items is equivalent to a 25% discount across both items combined. If items have different prices, the 50% discount applies to the lower-priced item.
How do manufacturer coupons vs store discounts affect tax?
Store discounts and instant sale prices lower the taxable purchase subtotal. However, in some US states, manufacturer reimbursement coupons may be taxed on the pre-coupon full value.