Original price = Sale price / (1 - Discount%/100). For example, if $80 is 20% off: $80 / 0.80 = $100. This is useful when you see a sale price and want to know the original.

How do I calculate the discount percentage?

Discount% = ((Original - Sale price) / Original) × 100. For example, from $100 to $75: ((100-75)/100) × 100 = 25% discount.

How do multiple discounts work?

For multiple discounts, apply them sequentially: never add the percentages together. For example, 20% off then 10% off: first $100 × 0.80 = $80, then $80 × 0.90 = $72, a total discount of 28%, not 30%. Stackable coupons work the same way: apply the coupon after the sale discount, and always use percentage-based discounts before fixed-amount coupons for maximum savings.

Why verify advertised discounts?

Sometimes advertised 'original prices' are inflated to make discounts look bigger. Use this calculator to check if the math adds up. If a $75 item is advertised as 30% off from $100, but $100 × 0.70 = $70, the discount is actually 25%.

Can I use this with any currency, like INR, PKR, or GBP?

Yes, the calculator is currency-agnostic: it only does percentage math, so enter prices in whatever currency you shop in and the results come out in the same unit. Results round to two decimal places, which suits most currencies; for prices that round to whole numbers only, the two-decimal display still shows the correct value.

How do I calculate discounts in Excel?

The tool does not export spreadsheets, but the formulas are simple: sale price =A2*(1-B2) when A2 holds the original price and B2 the discount as a decimal (0.2 for 20%); original price =A2/(1-B2); discount percentage =(A2-B2)/A2. Format the discount cells as percentages and the results match this calculator exactly.

What is a 'buy one get one free' in percentage terms?

Buy One Get One Free (BOGO) is equivalent to a 50% discount on the total purchase when buying two identical items. Buy Two Get One Free equals approximately 33% off. This calculator can help you compare BOGO offers against straight percentage discounts to see which gives better value.

How do I calculate tax on a discounted price?

First calculate the discounted price using this tool, then apply tax to that result. For example, $100 with 20% off = $80 sale price. If tax is 8%, the final price = $80 × 1.08 = $86.40. Some regions calculate tax before discount: check your local tax rules.

How do I calculate a 50% off + extra 10% off promotion?

Apply discounts sequentially. First discount: original × 0.50. Second discount: result × 0.90. For $100: 100 × 0.50 = $50, then $50 × 0.90 = $45. Total savings: $55 (55% off, not 60% off). Apply percentage discounts before fixed-amount coupons for maximum savings.

What is the difference between 'up to 50% off' and '50% off'?

'Up to 50% off' means some items get lower discounts (10%, 20%, 30%) while select items get 50%. '50% off' means every item in the promotion is half price. Retailers use 'up to' to attract customers while protecting margins. Always check which items qualify for the maximum discount.

How do I calculate whether a bulk discount is worth it?

Calculate the per-unit cost after discount and compare to the regular per-unit cost. For example, 'buy 3 get 1 free' on items costing $10 each: 4 items for $30 = $7.50 each (25% discount per item). Compare this to a straight 20% off ($8 each): the BOGO deal is better. Use this calculator to model different scenarios.

Why are results rounded to two decimal places?

Price results are rounded to cents so they match how money actually works: $80.005 becomes $80.01, and $79.999 becomes $80.00. The calculation itself uses full precision internally, so rounding only happens on the displayed result. If you need more decimals, treat the shown values as the final prices.

Why does my result differ from the store's calculation?

Stores often round to whole dollars on sale tags, apply tax before or after the discount differently, or base the percentage on an inflated reference price. This calculator applies the discount to the exact original price and rounds to cents only at the end. If the store shows 25% off but your math says 22%, the reference price is usually the reason: that is exactly what the 'Find Discount Percentage' mode reveals.

What happens if I enter a discount above 100% or a negative one?

The formula works with any number: a discount above 100% produces a negative sale price (the seller would owe you money), and a negative discount acts as a markup: entering -10% raises the price by 10%, which is a handy way to calculate price increases. The tool does not block these inputs, so interpret the result accordingly.

Why does the discount look smaller after VAT is added?

Because VAT is charged on the discounted price, not the original one. For a £100 item at 20% off: the sale price is £80, then 20% UK VAT brings the total to £96. The discount calculator formula for this case is: final price = original price × (1 - discount%) × (1 + VAT%). This tool calculates the discounted price first, then apply your local VAT rate to that result, which matches how VAT-inclusive price tags work in the UK and most of Europe.

Why does GST change my discount calculation in India?

It depends on whether GST is inclusive or exclusive. With MRP-style GST-inclusive prices, the discount applies to the same base, so the percentage is unaffected. With GST-exclusive prices, the total becomes original × (1 - discount%) × (1 + GST%): for example, ₹1,000 at 30% off with 18% GST: 1000 × 0.70 = ₹700, then ₹700 × 1.18 = ₹826. Enter prices in INR and this discount calculator handles the math; you apply the GST rate yourself after getting the sale price.