Discount Calculator

What this tool does

The Discount Calculator shows the final price and how much you save for any percentage or fixed-amount discount. It handles stacked offers such as 20% plus an extra 10%, adds tax on the discounted price, multiplies by quantity and can work backwards from a sale price to the discount percentage.

Sales and coupons are quoted in different ways: a percentage off, a fixed amount off, or two offers combined such as “20% off plus an extra 10% at checkout”. Stacked discounts are where people most often go wrong. They are applied one after the other, so 20% plus 10% gives 28% off, not 30%, because the second discount is taken from the already reduced price.

This calculator applies each discount in turn, final = price × (1 − d1) × (1 − d2), or subtracts a fixed amount, then adds an optional sales tax or VAT on the discounted price as most shops charge it. The reverse mode gives discount % = (original − sale) ÷ original × 100, so you can check whether a “sale” is really as good as the label suggests.

How to use Discount Calculator

1. Choose Sale price from a discount, or Discount % from two prices.
2. Enter the original price.
3. For a sale price, pick percentage or fixed amount off and enter the discount; add an extra stacked discount if offered.
4. For the reverse mode, enter the sale price instead.
5. Optionally add the sales tax or VAT rate and a quantity.
6. Read the final price, the amount you save and the overall discount.

Tips for better results

• Check whether the tax is included in the displayed price; in India and the EU retail prices usually include it.
• Compare the final price per unit when bulk offers and percentage discounts compete.
• A fixed amount off is worth more than a percentage on cheap items, and less on expensive ones.

Common use cases

• Checking checkout totals during a festive or seasonal sale.
• Comparing a “buy more, save more” offer with a flat discount.
• Pricing a promotion for a shop or online store.
• Finding the real discount when only the old and new prices are shown.

Common mistakes to avoid

• Adding stacked percentages together instead of applying them in sequence.
• Calculating tax on the original price rather than the discounted price.
• Trusting an inflated “original” price; compare with what the item usually sells for.