Final Price
$80.00
You Save
$20.00
Discount Rate
20%
This discount calculator answers the three questions shoppers and sellers actually ask: what will I pay after the discount, what percentage off is this deal really, and what was the price before the markdown. It suits anyone comparing sale prices, setting retail discounts, or double-checking that a “70% off” banner is telling the truth.
How to Use
- Choose a mode: Pick Find Final Price, Find Discount Rate, or Find Original Price depending on which value is unknown
- Enter the known values: Fill in the original price, sale price, or discount percentage as the mode requires
- Read the results: See the answer along with supporting figures like the amount saved, updating instantly as you type
Features
- Three calculation modes — solve for final price, discount rate, or original price
- Amount saved shown alongside the price — see the discount in dollars, not just percentages
- Instant results — no submit button; numbers update as you type
- Input validation — clear error messages when a value is missing or impossible
- 100% client-side — nothing you enter is sent anywhere
Why “Extra 10% Off” Isn’t What It Seems
The most common discount mistake is adding percentages. A jacket marked 40% off with an extra 20% off at checkout is not 60% off. The first cut takes a $100 jacket to $60; the second takes 20% of that — $12 — leaving $48. The real combined discount is 52%. Stacked discounts always multiply, never add: two successive discounts of a% and b% equal a single discount of (a + b − a×b/100)%.
The reverse trap is just as common. If a store raises a price 20% and later discounts it 20%, you don’t return to the original price — $100 becomes $120, then $96. Percentages are relative to whatever number they apply to, and that number keeps changing. When in doubt, run each step through the calculator instead of doing percentage arithmetic in your head.
Use Cases
- Shopping: Verify the real savings on a sale item before you buy
- Retail pricing: Set a discount rate that hits a target sale price
- Reverse-engineering deals: Work out the original price from a tagged sale price
- Comparing offers: Check whether “30% off” beats “buy two, get one free” for the same product
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Frequently Asked Questions
How do I calculate the final price after a discount?
Use the Find Final Price mode. Enter the original price and the discount percentage. The calculator will show the discounted price and how much you save. Formula: Final Price = Original Price x (1 - Discount%/100).
How do I find what percentage discount was applied?
Use the Find Discount Rate mode. Enter the original price and the sale price. The calculator determines the discount percentage. Formula: Discount% = (Original - Final) / Original x 100.
Can I calculate the original price before a discount?
Yes, use the Find Original Price mode. Enter the sale price and the discount percentage. The calculator works backwards to find the pre-sale price. Formula: Original = Final / (1 - Discount%/100).
What about stacked or multiple discounts?
This calculator handles one discount at a time. For stacked discounts (e.g., 20% off plus an extra 10% off), calculate them one at a time: apply the first discount to get an intermediate price, then apply the second discount to that result.