Cách đến Tính Discount Percentage (Miễn phí Calculator)

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

The four discount formulas

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

Cách đến tính discount: sale price từ % off

Example: ₹2,499 với 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 bạn pay 70%, so sale price là 2,499 × 0.70 = ₹1,749.30 in one step.

In máy tính: use first line, Điều gì là X% of Y? Type 70 và 2,499 đến get sale price (1,749.3), hoặc 30 và 2,499 đến get saving (749.7).

Discount percentage từ two prices

Example: a jacket was $80, now $60

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

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

In máy tính: use third line, Percentage change. Type 80 in From và 60 in đến. It answers "A decrease of 25%" và shows change (−20).

Nếu shop gives bạn a flat amount off instead, such as ₹500 off ₹2,000, use second line, X là what percent of Y?: 500 là what % of 2,000? 25%.

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

"Extra 10% off already reduced prices" sounds like 30% off in tổng. It isn't, because second discount là taken từ 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 bạn pay at each step: 0.80 × 0.90 = 0.72, so bạn pay 72% và save 28%. The order doesn't matter: 10% then 20% gives same ₹720.

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

In máy tính: do it in two passes. "Điều gì là 80% of 1,000?" gives 800; "Điều gì là 90% of 800?" gives 720. Then use Percentage change từ 1,000 đến 720 đến see 28%.

When a flat coupon là involved, order matters

Percentage discounts có thể be applied in any order, but a flat coupon có thể't. On a ₹2,000 item với 10% off và a ₹200 coupon:

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

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

Buy one, get one và other deals as a percentage

• Buy 1, get 1 miễn phí: bạn pay cho 1 of 2 items, so 50% off each, nếu bạn wanted two.
• Buy 2, get 1 miễn phí: bạn pay cho 2 of 3, so about 33.3% off.
• Buy 1, get second at half price: bạn pay 1.5 cho 2, so 25% off.

These là only discounts nếu bạn'd have bought extra items anyway.

Working back đến original price

Nếu a tag says "₹1,749.30 after 30% off" và bạn want original price, divide by what bạn 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 là wrong. Our guide on how to calculate percentage covers this "original số" question in more detail.

Discounts và tax

Sales tax hoặc GST là normally charged on discounted price. Because both là percentages, order doesn't change result: $100 với 20% off và 8% tax là 100 × 0.80 × 1.08 = $86.40 either way. Rates và rules vary by place, so check của bạn receipt. For splitting a bill với tax và tip, free tip calculator là quicker.

Có phải really a deal?

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

Work out a discount now

Mở free percentage calculator: use Điều gì là X% of Y? cho sale prices và savings, và Percentage change cho % off between two prices. Answers update as bạn type, và nothing bạn enter leaves của bạn device.