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Discount Calculator — Final Price After % Off

Calculate the final price after a discount, find what percentage off an item is, or work out the original price before a discount was applied.

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How to Calculate Discounts

Finding the Final Price After a Discount

Formula: Final Price = Original Price × (1 − Discount% ÷ 100)
Example: $100 item with 20% off: $100 × 0.80 = $80

Finding the Discount Percentage

Formula: Discount% = ((Original − Sale) ÷ Original) × 100
Example: Was $100, now $75: ((100 − 75) ÷ 100) × 100 = 25% off

Finding the Original Price

Formula: Original = Sale Price ÷ (1 − Discount% ÷ 100)
Example: $75 after 25% off: 75 ÷ 0.75 = $100 original

Double Discounts

When two discounts are applied sequentially (e.g. 20% off then 10% off), they do NOT add up to 30%. The second discount applies to the already-reduced price. 20% off $100 = $80. Then 10% off $80 = $72. Total effective discount: 28%, not 30%.

Frequently Asked Questions

How do I calculate 20% off a price mentally?+
Find 10% first (move the decimal one place left), then double it. Example: 20% of $85 = 10% is $8.50, doubled = $17. So $85 minus $17 = $68. For 25% off: find 10% and 15% (10% + half of 10%) and add them. Mental math shortcuts make quick shopping decisions much easier.
Is a 50% discount the same as buy-one-get-one-free?+
Mathematically yes — if you buy one item at full price and get one free, you've paid for two but received two, so the effective discount is 50% per item. However, BOGO requires you to purchase two items, while a 50% discount on a single item doesn't. For the discount to be equivalent, you need to actually want two of the item.
What is a "markdown" vs a "discount"?+
In retail, a markdown is a permanent price reduction (the item's price tag is changed), while a discount is typically a temporary promotional reduction applied at checkout. Both result in a lower price for the consumer. For tax purposes, the distinction can matter — some jurisdictions tax on the pre-discount price, others on the final sale price.
Does sales tax apply before or after discount?+
In the US, sales tax is generally calculated on the discounted (final sale) price, not the original price. So if an item is $100, discounted to $80, and sales tax is 8%, you pay $80 × 1.08 = $86.40. Use our Sales Tax Calculator alongside this discount calculator to get the total final price including tax.

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