Как рассчитать процент скидки

To calculate a discount, multiply the original price by the discount percentage and divide by 100; that's how much you save. Subtract it from the price to get the sale price. So 30% off ₹2,499 saves ₹749.70, and you pay ₹1,749.30. To find the discount percentage from two prices, divide the difference by the original price and multiply by 100: $80 down to $60 is 25% off. The free percentage calculator does both as you type.

The four discount formulas

You know	You want	Formula
Price and % off	Sale price	price × (100 − discount) ÷ 100
Price and % off	Amount saved	price × discount ÷ 100
Original and sale price	% off	(original − sale) ÷ original × 100
Sale price and % off	Original price	sale ÷ (100 − discount) × 100

Как это сделать calculate discount: sale price from % off

Example: ₹2,499 with 30% off

1. Amount saved = 2,499 × 30 ÷ 100 = ₹749.70
2. Sale price = 2,499 − 749.70 = ₹1,749.30

A quicker way: at 30% off you pay 70%, so the sale price is 2,499 × 0.70 = ₹1,749.30 in one step.

In the calculator: use the first line, What is X% of Y? Type 70 and 2,499 to get the sale price (1,749.3), or 30 and 2,499 to get the saving (749.7).

Discount percentage from two prices

Example: a jacket was $80, now $60

1. Difference = 80 − 60 = $20
2. Discount = 20 ÷ 80 × 100 = 25%

Always divide by the original price, not the sale price. Dividing by $60 would give 33.3%, which overstates the deal.

In the calculator: use the third line, Percentage change. Type 80 in From and 60 in to. It answers "A decrease of 25%" and shows the change (−20).

If the shop gives you a flat amount off instead, such as ₹500 off ₹2,000, use the second line, X is what percent of Y?: 500 is what % of 2,000? 25%.

Stacked discounts: 20% + 10% isn't 30%

"Extra 10% off already reduced prices" sounds like 30% off in total. It isn't, because the second discount is taken from the already-lower price.

Example: ₹1,000 item, 20% off, then an extra 10% off

1. After 20% off: 1,000 × 0.80 = ₹800
2. After another 10% off: 800 × 0.90 = ₹720
3. Total discount: (1,000 − 720) ÷ 1,000 × 100 = 28%, not 30%

To combine two discounts quickly, multiply what you pay at each step: 0.80 × 0.90 = 0.72, so you pay 72% and save 28%. The order doesn't matter: 10% then 20% gives the same ₹720.

Stacked discounts	You pay	Real total discount
20% + 10%	72%	28%
30% + 20%	56%	44%
50% + 20%	40%	60%
50% + 50%	25%	75%

In the calculator: do it in two passes. "What is 80% of 1,000?" gives 800; "What is 90% of 800?" gives 720. Then use Percentage change from 1,000 to 720 to see the 28%.

When a flat coupon is involved, order matters

Percentage discounts can be applied in any order, but a flat coupon can't. On a ₹2,000 item with 10% off and a ₹200 coupon:

• 10% off first, then the coupon: 2,000 × 0.90 − 200 = ₹1,600
• Coupon first, then 10% off: (2,000 − 200) × 0.90 = ₹1,620

Taking the percentage first saves you ₹20 more. Shops set their own rules on which comes first, so check the checkout total.

Buy one, get one and other deals as a percentage

• Buy 1, get 1 free: you pay for 1 of 2 items, so 50% off each, if you wanted two.
• Buy 2, get 1 free: you pay for 2 of 3, so about 33.3% off.
• Buy 1, get the second at half price: you pay 1.5 for 2, so 25% off.

These are only discounts if you'd have bought the extra items anyway.

Working back to the original price

If a tag says "₹1,749.30 after 30% off" and you want the original price, divide by what you paid as a share: 1,749.30 ÷ 0.70 = ₹2,499. Don't add 30% back on: 1,749.30 × 1.30 = ₹2,274.09, which is wrong. Our guide on how to calculate percentage covers this "original number" question in more detail.

Discounts and tax

Sales tax or GST is normally charged on the discounted price. Because both are percentages, the order doesn't change the result: $100 with 20% off and 8% tax is 100 × 0.80 × 1.08 = $86.40 either way. Rates and rules vary by place, so check your receipt. For splitting a bill with tax and tip, the free tip calculator is quicker.

Is it really a deal?

A big percentage is only meaningful if the original price was real. Before a sale, compare the price with other shops and with what the item sold for a few weeks earlier. For shopping-season tactics, see Black Friday discount maths. Shopping abroad? The free currency converter shows the price in your money. And to understand price rises as well as cuts, read how to calculate percentage increase and decrease.

Work out a discount now

Open the free percentage calculator: use What is X% of Y? for sale prices and savings, and Percentage change for the % off between two prices. Answers update as you type, and nothing you enter leaves your device.