Discount Calculator
Calculate discounted prices, savings, stacked discounts and find the discount percentage between two prices. Four modes in one tool.
Enter the price
Original price and discount %
Choose the mode
Single, double, reverse or find %
See the result
Final price, savings and details
How to Calculate Discounts: Complete Guide
Calculating a percentage discount is essential for smart shopping and business pricing. This calculator offers four different modes for every scenario.
Simple discount
The basic formula: Sale price = Original price × (1 - Discount/100). If an item costs $100 and the discount is 25%, you pay $100 × 0.75 = $75, saving $25.
Stacked discounts
When two discounts are combined, the second applies to the already-reduced price. 20% + 10% off doesn’t make 30% — it’s 28%: $100 × 0.80 = $80 × 0.90 = $72. The effective discount is always less than the sum of individual discounts.
Finding the original price
If you know the sale price and discount percentage, find the original: Original = Sale price / (1 - Discount/100).
Finding the discount percentage
To know how much discount you got: Discount % = ((Original - Sale) / Original) × 100. Useful for comparing offers and finding which deal is truly better.
Frequently Asked Questions
How do you calculate a percentage discount?
Multiply the original price by the discount percentage and divide by 100. The result is your savings. Subtract from the original price to get the final price.
How do stacked discounts work?
Stacked discounts are applied one after the other: the first discount on the original price, then the second on the already-reduced price. The effective discount is always less than the sum of the two.
Does 50% + 50% off equal 100% off?
No. Two 50% discounts applied sequentially give a 75% effective discount. $100 → $50 → $25. Total savings is $75, not $100.
How do I find the original price from a sale price?
Divide the sale price by (1 - discount/100). Example: $72 with 20% off → 72 / 0.80 = $90 was the original price.
How do I know if a discount is really good?
Use the “Find %” mode to calculate the actual discount percentage between the full price and sale price. Compare effective discounts, not advertised ones.
Is tax calculated before or after the discount?
The discount is applied before tax. Calculate the discounted price first, then add tax. This calculator handles the correct order automatically.
How does quantity pricing work?
Enter the quantity to see the total cost. Savings are multiplied by the number of items, useful for bulk purchases or multiple orders.
How much is 20% off $100?
20% off $100 means you save $20 and pay $80. The formula: 100 × 20 / 100 = $20 discount. This works for any amount: 20% off $50 saves $10, 20% off $200 saves $40. For more complex calculations, use the calculator above.
How do Black Friday discounts work?
Black Friday discounts typically range from 20% to 70% off. Watch out for stacked discounts (e.g. “30% off + extra 10% off”): they don’t add up to 40% but apply sequentially, giving an effective 37% discount. Use the “Stacked Discount” mode above to verify your real savings before buying.
How to calculate discount on multiple items?
Enter the unit price, the discount percentage and the quantity in the quantity field. The calculator automatically multiplies savings by the number of items. Perfect for bulk purchases, business orders, or shopping during seasonal sales.
Real-World Discount Examples
Seasonal Sales & Black Friday
A store offers 30% off a $150 jacket. You save $45 and pay $105. But if they add an “extra 15% at checkout,” you don’t pay $82.50 (45% off) but $89.25 (effective 40.5% off). That 4.5-point difference may seem small, but on a $500 cart it’s $22.50 less than you expected.
E-commerce & Coupon Codes
You have a 10% coupon code and the product is already 20% off. Original price $80: first discount 20% = $64, then coupon 10% = $57.60. Your effective discount is 28%, saving $22.40 instead of the $24 you’d expect from adding 20+10.
B2B & Volume Discounts
A supplier offers 15% off on orders of 50+ units at $12 each. Unit price drops to $10.20. On 50 units the total goes from $600 to $510, saving $90. For larger orders (100+ units) you can often negotiate an additional 5%, bringing the price to $9.69 — saving $231 on 100 units.
Common Discount Reference Table
| Price | 10% off | 20% off | 30% off | 50% off |
|---|---|---|---|---|
| $25 | $22.50 | $20 | $17.50 | $12.50 |
| $50 | $45 | $40 | $35 | $25 |
| $100 | $90 | $80 | $70 | $50 |
| $200 | $180 | $160 | $140 | $100 |
| $500 | $450 | $400 | $350 | $250 |
For other amounts and percentages, use the calculator above.
You might also like:
✎ Suggest a change
Try our AI-powered tools
Generate professional texts, emails, bios and slogans in seconds. 10 free credits at sign up — no card needed.