Percentage Off Calculator
Enter the full price before any discount
Enter a Price to Get Started
Type in an original price and a discount percentage to instantly see the sale price, amount saved, visual charts, and a full discount comparison table.
How to Use This Calculator
Choose a Calculation Mode
Select from three modes at the top: 'Calculate Sale Price' to find how much you pay, 'Find Original Price' to reverse-engineer a pre-discount price, or 'Find Discount %' to discover how much a price was marked down. Each mode shows the relevant input fields.
Enter Your Prices and Percentage
Type in the required values. For the default mode, enter the original price (e.g., 79.99) and the discount percent (e.g., 25). Use the quick preset buttons — 10%, 20%, 25%, 30%, 50% — to fill in common discount values with a single click.
Enable Optional Features
Check 'Add a second discount' if a store is stacking two promotions, and enter the second percentage. Check 'Include sales tax' and enter your local tax rate to see the full after-tax cost and total savings including the tax reduction.
Review Results and Charts
The results show instantly as you type. Review the sale price, amount saved, formula used, and the stacked or tax breakdown if enabled. Scroll down to see the donut chart, bar chart, and the full Discount Comparison Table for 11 common discount levels. Export the table to CSV if needed.
Frequently Asked Questions
How do I calculate percentage off in my head?
For round percentages, there are quick mental shortcuts. For 10% off, simply move the decimal one place left (10% of $80 = $8). For 20% off, find 10% and double it. For 25% off, divide by 4. For 50% off, divide by 2. For 30% off, multiply by 0.7. For 15% off, find 10%, halve it to get 5%, and add both together. These shortcuts work well for whole-dollar prices but can be harder with decimal prices, which is exactly why a calculator like this is so useful for shopping.
Is 20% off + 15% off the same as 35% off?
No. Two sequential discounts do not simply add together. When a store applies 20% off followed by an additional 15% off, the second discount is calculated on the already-reduced price, not the original. On a $100 item: 20% off brings the price to $80, and 15% off $80 is $12, giving a final price of $68 — a true combined savings of 32%, not 35%. This difference grows with larger prices and larger discount percentages. Our stacked discount feature shows both the correct combined savings and the naive additive sum so you can see the exact difference.
How do I find the original price if I only know the sale price and discount?
Use the 'Find Original Price' mode. The formula is: Original Price = Sale Price ÷ (1 − Discount% ÷ 100). For example, if an item is on sale for $60 after a 25% discount: Original = $60 ÷ (1 − 0.25) = $60 ÷ 0.75 = $80. This is useful when a store shows a sale price without prominently displaying the original price, or when you want to verify a 'was/now' claim. Simply enter the sale price and the stated discount percentage into the calculator's reverse mode and it computes the original price instantly.
Does the discount reduce my sales tax too?
Yes, in most jurisdictions sales tax is calculated on the discounted (sale) price, not the original price. So a 20% discount on a $100 item reduces the taxable amount to $80, and an 8% sales tax on $80 is $6.40 — compared to $8.00 on the original price. This means you save on tax as well as on the item itself. Our calculator's tax integration shows the after-tax original price, after-tax sale price, and total savings including the tax reduction, giving you the true all-in cost comparison.
What is the Discount Comparison Table?
The Discount Comparison Table appears automatically when you enter an original price in the default mode. It generates the sale price and amount saved at 11 common discount levels: 5%, 10%, 15%, 20%, 25%, 30%, 40%, 50%, 60%, 70%, and 75%. Your currently entered discount percentage is highlighted in the table. This is useful for quickly comparing how different deal tiers affect your costs — for example, deciding whether a 40% off sale is meaningfully better than a 30% off competitor. You can download the entire table as a CSV file using the Export button.
How do I find what percentage off a price was reduced?
Use the 'Find Discount %' mode. Enter the original price and the sale price, and the calculator computes the exact discount percentage using the formula: Percent Off = (Original − Final) ÷ Original × 100. For example, if a jacket originally cost $120 and is now $84: Percent Off = ($120 − $84) ÷ $120 × 100 = $36 ÷ $120 × 100 = 30%. This mode is especially helpful when a store advertises a sale price without clearly stating the percentage, or when you want to compare the effective discount depth across multiple products.