Percent Off Calculator
Technical Calculation Methodology and Tool
You see a price tag with "30% off" and want to know the exact dollar amount you'll actually pay — before you reach the register. Use this Percent Off Calculator to calculate the sale price and your savings using the original price and discount percentage. It's useful across retail shopping, coupon stacking, clearance pricing, and supplier negotiations. This page covers the formula, worked examples, a quick reference table, and answers to the most common discount questions.
What is percent off?
Percent off is the portion of a price that gets removed as a discount. If something is 25% off, you pay only 75% of the original price — the store absorbs the other 25%.
Simple Explanation
Think of the original price as a full glass of water. A 20% discount tips out 20% of that water — you only drink what's left. The calculator works out exactly how much gets tipped out (your savings) and how much remains (your sale price).
Percent Off Calculator
Calculate sale price, savings, or find the original price
Calculator Summary
Interactive Percent Off Calculator
Use this percent off calculator to find the final sale price, the amount you save, or the original price before a discount was applied. It is useful for shopping, coupons, markdowns, clearance pricing, promotions, and reverse discount calculations.
How to Use This Calculator
- Select Find Sale Price to calculate savings and the final discounted price, or select Find Original Price to reverse-calculate the starting price.
- Enter the original price in the price field.
- Enter the discount percentage — or tap one of the quick-select buttons (10%, 20%, 25%, 30%, 40%, 50%).
- Click Calculate to see your result.
How Percent Off Works
When a price is reduced by a percentage, you pay only the remaining portion of the original price. For example, 25% off means you still pay 75% of the original price. The discount amount and the final sale price both come from the original price before any markdown.
The Percent Off Formula
Use the formula below to calculate percent off.
To find the original price from a sale price:
Simple Example
Original price: $100 | Discount: 20%
Savings = $100 × 0.20 = $20
Sale price = $100 − $20 = $80
Worked Examples
A TV is $799 with 35% off. How much do you pay?
You save $279.65. Sale price: $519.35.
A jacket is on sale for $63 at 30% off. What was the original price?
Original price: $90. You saved $27.
A 20% off coupon applies to a $14.50 item. What is the checkout price?
You save $2.90. You pay $11.60.
A pair of shoes is marked 50% off from $120.
You save $60. The sale price is $60.
A lamp costs $48 and is reduced by 15%.
You save $7.20. The sale price is $40.80.
Common Percent Off Results
This table shows common discount percentages and how much remains to pay after the markdown.
| Discount | You Save on $100 | You Pay on $100 |
|---|---|---|
| 10% off | $10 | $90 |
| 15% off | $15 | $85 |
| 20% off | $20 | $80 |
| 25% off | $25 | $75 |
| 30% off | $30 | $70 |
| 40% off | $40 | $60 |
| 50% off | $50 | $50 |
Stacked Discounts — What to Watch For
Retailers sometimes advertise 20% off plus an extra 10% off at checkout. This does not mean 30% off. On a $100 item, 20% off gives $80. Then 10% off $80 gives $72. Total saving is $28 — not $30. Always calculate stacked discounts in sequence rather than adding the discount rates together.
Common Mistakes to Avoid
- Assuming stacked discounts add up: They do not. Each new discount applies to the already-reduced price.
- Confusing savings with final price: A 40% discount on $50 saves $20, which means the sale price is $30.
- Ignoring tax after the discount: Sales tax is usually calculated after the discount has been applied.
- Using reverse mode incorrectly: To find the original price, divide by the remaining percentage, not the discount percentage.
Quick Answers
What is 20% off $50? You save $10 and pay $40.
What is 30% off $100? You save $30 and pay $70.
Is 50% off the same as half price? Yes.
How do I find the original price from a sale price? Divide the sale price by the remaining percentage.
Final Answer
To calculate percent off, multiply the original price by the discount rate to find the savings, then subtract that amount from the original price. To reverse the process, divide the sale price by the remaining percentage. This calculator gives you the exact savings and final price instantly.