Discount Calculator
Calculate sale price and how much you save
The Discount Calculator tells you exactly how much you save and what you'll actually pay after a percentage discount is applied. Useful for shopping, invoicing, and any situation where you need to quickly work out a sale price.
Formula: Final Price = Original Price × (1 − Discount% ÷ 100)
Quick mental shortcuts for common discounts:
- 10% off — move the decimal one place left
- 25% off — divide by 4 and subtract
- 50% off — divide by 2
- 20% off — find 10% (÷10) and double it, then subtract
Example
A jacket originally priced at $120 is on sale at 35% off:
Savings = $120 × 0.35 = $42.00
Final price = $120 − $42 = $78.00
Frequently Asked Questions
How do I calculate a percentage discount?
Multiply the original price by the discount percentage, then divide by 100 to get the discount amount. Subtract that from the original price to get the final price. Example: 25% off $80 = $80 × 0.25 = $20 saved, final price = $60.
What is 20% off of $50?
20% of $50 = $10. Final price = $50 − $10 = $40. Quick way: find 10% ($5) and double it ($10). Subtract from original.
How do I calculate the original price from a discounted price?
Divide the discounted price by (1 − discount rate). If you paid $75 after a 25% discount: original = $75 ÷ 0.75 = $100.
What is 30% off $200?
30% of $200 = $60. Final price = $200 − $60 = $140. You save $60.
How do stacked discounts work?
Stacked discounts are not simply added together. A 20% discount followed by a 10% discount is not 30% off. First: $100 × 0.80 = $80. Then: $80 × 0.90 = $72. Total saving = $28 = 28%, not 30%.
What is the formula for discount percentage?
Discount % = (Original Price − Sale Price) ÷ Original Price × 100. Example: original $60, sale $45. Discount = ($60 − $45) ÷ $60 × 100 = 25%.
Is a 50% discount the same as half price?
Yes. 50% off means you pay half the original price. 50% of $100 = $50 saved, so you pay $50.
How do I calculate 15% off mentally?
Find 10% (move decimal left), then find 5% (half of 10%), and add them together. On $80: 10% = $8, 5% = $4, 15% = $12. Final price = $80 − $12 = $68.
What is a good discount percentage?
In retail, 10–20% is a typical sale. 30–50% indicates a significant clearance or seasonal sale. Over 50% suggests the original price was inflated or the product is being heavily cleared. Online discounts from 'was/now' pricing should be viewed with scepticism — original prices are sometimes inflated.
How do I calculate tax after a discount?
Apply the discount first, then apply tax to the discounted price. Example: $100 item, 20% off, 10% tax. Discounted = $80. Tax = $80 × 0.10 = $8. Total = $88. Tax is calculated on what you actually pay, not the original price.