Work out any discount and sale price
The discount calculator tells you exactly what you will pay and how much you save when something is on sale. It covers the five questions shoppers and sellers ask most: the price after a percentage off, the price after a fixed amount off, the true effect of stacked discounts such as “20% off plus an extra 10%”, the discount percentage between two prices, and the original price before a sale.
Results update as you type, with the formula shown under every answer. Tick “Add sales tax after the discount” for US-style checkout totals, choose your currency, and use the table to compare common discounts at a glance — useful for festival sales, Black Friday, end-of-season offers and coupon codes.
How to use the Discount Calculator
- Choose a mode at the top: “% off”, “Amount off”, “Stacked discounts”, “Find discount %” or “Price before discount”.
- Enter the original price, the sale price, or both, depending on the mode, and pick your currency.
- Type the discount or tap a quick button such as 20%, 30% or 50%.
- For stacked offers, enter each discount in the order it is applied; the third one is optional.
- Tick “Add sales tax after the discount” and enter your local rate if tax is added at the till.
- Read the final price, your saving and the total discount, and check the table for other discount levels.
Discount Calculator features
Five calculators in one
Percentage off, amount off, stacked discounts, discount percentage and reverse (original) price.
Honest stacked discounts
Shows why 20% + 10% is 28% off, not 30%, with each step of the calculation.
Sales tax at checkout
Adds tax to the discounted price, the way most US states charge it.
Visual savings bar
A bar shows the share of the original price you pay and the share you keep.
Comparison table
Sale price and saving at 5% to 70% off for the same item, to judge whether an offer is worth waiting for.
Discount formulas with examples
Price after a percentage discount: sale price = original × (1 − discount ÷ 100). A ₹2,499 jacket at 25% off costs 2,499 × 0.75 = ₹1,874.25, and you save ₹624.75.
Discount percentage from two prices: discount % = (original − sale) ÷ original × 100. Shoes reduced from $80 to $60 are (80 − 60) ÷ 80 × 100 = 25% off.
Original price before a discount: original = sale price ÷ (1 − discount ÷ 100). If you paid £75 after 25% off, the full price was 75 ÷ 0.75 = £100. A common mistake is to add 25% back to £75, which gives £93.75 — wrong, because the 25% was taken from the larger original price.
Sales tax after a discount: total = sale price × (1 + tax rate ÷ 100). A $100 item at 20% off with 8% sales tax costs 80 × 1.08 = $86.40. In India, the UK and the EU, shelf prices (MRP or VAT-inclusive prices) already include tax, so you normally don’t add any.
Why stacked discounts are less than they look
When a shop offers “20% off, then an extra 10% at checkout”, the second discount applies to the already-reduced price. On a $100 item, 20% off leaves $80, and 10% off $80 is $8, so you pay $72 — a total discount of 28%, not 30%. The general formula is total discount = 1 − (1 − d₁) × (1 − d₂) × (1 − d₃).
The order of stacked percentage discounts does not change the result, but mixing a percentage and a fixed amount does: $20 off then 10% off a $100 item costs $72, while 10% off then $20 off costs $70. Use the “Amount off” mode for each step if you need to check a mixed offer.
Multi-buy offers as a percentage discount
“Buy one, get one free” and similar deals are discounts too — but only if you wanted the extra items. If all items cost the same:
| Offer | Equivalent discount | Example on items of 500 each |
|---|---|---|
| Buy 1, get 1 free | 50% | Pay 500 for 1,000 of goods |
| Buy 2, get 1 free | 33.33% | Pay 1,000 for 1,500 |
| Buy 3, get 1 free | 25% | Pay 1,500 for 2,000 |
| Buy 1, get 1 at half price | 25% | Pay 750 for 1,000 |
| 3 for the price of 2 | 33.33% | Pay 1,000 for 1,500 |
Discount Calculator FAQ
How do I calculate a discount?
Multiply the original price by the discount percentage and divide by 100 to get the amount saved, then subtract it from the price. For 30% off ₹1,200: 1,200 × 30 ÷ 100 = ₹360 saved, so you pay ₹840. The discount calculator does this instantly in the “% off” mode.
Is 20% off plus 10% off the same as 30% off?
No. The second discount is taken from the already-reduced price, so 20% then 10% is 1 − 0.8 × 0.9 = 28% off in total. Choose “Stacked discounts” to see the exact figure for any combination.
How do I find the discount percentage between two prices?
Subtract the sale price from the original price, divide by the original price and multiply by 100. From 80 to 60 is (80 − 60) ÷ 80 × 100 = 25%. You can also check price rises with the percentage change calculator.
How do I find the original price from the sale price?
Divide the sale price by (1 − discount ÷ 100). A sale price of 450 after 10% off means an original price of 450 ÷ 0.9 = 500. Use the “Price before discount” mode.
Is sales tax calculated before or after the discount?
In most places tax is charged on the price you actually pay, so it is calculated after a store discount. Some US states treat manufacturer coupons differently, so check your receipt. Where prices include GST or VAT, the discount already covers the tax portion — see the GST calculator to split it out.
Can I use this as a sale price calculator for my shop?
Yes. Enter your regular price and try different discounts, then check the result against your costs with the profit margin calculator so a promotion does not wipe out your margin. Results are estimates for planning and are not financial advice.