Free AI Discount Calculator: Simple, Double & Discount Rate
Type any deal in plain words or pick a calculator: simple discount, discount rate, double discount, item-level bill discount and the profit impact of a discount. Shows the final price, the saving, the effective discount and every step of the working.
What Is a Discount Calculator?
A discount calculator works out how much you save on a price cut and what you finally pay. You enter the original price and the discount, as a percentage or a fixed amount, and it gives you the final price and the amount saved. It can also work backwards to find the discount percentage or the original price.
This one goes further. It has five calculators in one page:
- Simple: any two of original price, discount and final price give you the rest, with optional GST.
- Discount rate: the percentage off from two prices, or the finance discount rate between a future amount and today’s value.
- Double discount: up to six stacked discounts, percentage or flat, in the order they apply.
- Item level: a small bill with a different discount on each item, a bill discount and GST.
- Impact: for sellers, how a discount changes your profit and how many more units you must sell to make up for it.
The smart deal reader at the top lets you type an offer the way it appears on a banner, and it fills in the right calculator for you.
How to Use the Free AI Discount Calculator
- Type the deal in the smart box, for example “₹3,999 flat 40% off + ₹500 cashback”, and press Read deal. Or pick a tab yourself.
- Check the numbers it filled in. Edit any box; results update as you type.
- Choose the currency if you are not shopping in rupees. The maths is the same.
- Read the result: the final price, the amount saved, the effective discount and the step-by-step working. Use Copy result to share it.
How to Calculate a Discount
Example: 25% off a ₹2,000 jacket.
- Discount amount = 2,000 × 25 ÷ 100 = ₹500.
- Final price = 2,000 − 500 = ₹1,500.
Quick mental trick
10% of any price is the price with the decimal moved one place left: 10% of ₹2,000 is ₹200. From there, 20% is double, 5% is half, and 25% is a quarter of the price. For 15% off, add 10% and 5%: on ₹2,000 that is ₹200 + ₹100 = ₹300.
Discount Rate Calculator
“Discount rate” means two different things, and the Discount rate tab handles both.
1. Shop discount rate (percentage off)
A ₹1,200 shirt on sale for ₹900 has a discount rate of (1,200 − 900) ÷ 1,200 × 100 = 25%. If you are the seller and enter your cost price, the calculator also shows your markup and margin before and after the sale.
2. Finance discount rate (present value)
In finance, the discount rate turns money you will get later into what it is worth today. At an 8% discount rate, ₹1,00,000 due in 5 years is worth 1,00,000 ÷ 1.08⁵ = ₹68,058 today. Investors use this to compare a future payout with investing the money now.
Discount Impact Calculator
For a shop owner, a discount comes straight out of profit. The Impact tab shows how much more you need to sell to earn the same gross profit after a price cut:
| Your gross margin | 10% discount | 20% discount | 30% discount |
|---|---|---|---|
| 25% | +67% sales | +400% sales | Loss on every sale |
| 30% | +50% sales | +200% sales | Profit wiped out |
| 40% | +33% sales | +100% sales | +300% sales |
| 50% | +25% sales | +67% sales | +150% sales |
Swipe the table sideways to see every column.
Example: you sell a product for ₹1,000 that costs you ₹600, a 40% margin. A 10% discount cuts your profit per unit from ₹400 to ₹300. To keep earning the same total profit, you must sell a third more units. If you sell 300 a month now, you need 400. Discounts only pay off when they bring in that much extra volume, clear old stock or win customers who come back at full price.
Item Level Discount Calculator
An item-level discount is a different discount on each line of a bill, as on an invoice or a supermarket receipt. The Item level tab takes a list of items with their quantity, price and discount, then adds a discount on the whole bill and GST.
The order is: item discounts → bill discount → tax.
| Item | Qty | Price | Discount | Line total |
|---|---|---|---|---|
| T-shirt | 2 | ₹1,499 | 10% | ₹2,698.20 |
| Jeans | 1 | ₹2,999 | 20% | ₹2,399.20 |
| Socks | 3 | ₹349 | 0% | ₹1,047.00 |
| After item discounts (from ₹7,044.00) | ₹6,144.40 | |||
| Bill discount 5% | − ₹307.22 | |||
| GST 18% on ₹5,837.18 | + ₹1,050.69 | |||
| Total to pay | ₹6,887.87 | |||
Swipe the table sideways to see every column.
In India, a discount shown on the invoice at the time of sale reduces the value on which GST is charged, which is why GST comes last. Load the sample bill in the calculator to see this example worked out.
Simple Discount Calculator
The Simple tab solves the three most common questions with one set of boxes. Fill any two and leave the third blank:
| You know | You want | Formula |
|---|---|---|
| Original price, discount % | Final price | Original × (1 − d ÷ 100) |
| Original price, final price | Discount % | (Original − Final) ÷ Original × 100 |
| Final price, discount % | Original price | Final ÷ (1 − d ÷ 100) |
| Original price, amount off | Final price and % | Original − amount; amount ÷ Original × 100 |
Swipe the table sideways to see every column.
Switch the discount box from % to amount for “₹300 off” offers. Add a GST or sales-tax rate to see the price you actually pay at the counter.
Double Discount Calculator
A double discount is two discounts on the same purchase, such as a 30% sale price plus an extra 10% with a bank card. The second discount applies to the price after the first one.
Example: a ₹2,499 phone case with 30% off and an extra 10%. 2,499 × 0.70 × 0.90 = ₹1,574.37. The effective discount is 1 − 0.70 × 0.90 = 37%, not 40%.
The Double tab lets you mix percentage and flat discounts and keeps them in order. When a flat amount and a percentage are mixed, it also shows what the price would be in the other order, so you can see which order the shop should use.
Discount on Discount Calculator
“Discount on discount” is the same idea as a double discount: an extra percentage off an already discounted price. People often add the two numbers, which overstates the saving:
| Offer | Looks like | Real discount | On ₹1,000 you pay |
|---|---|---|---|
| 20% + 10% | 30% | 28% | ₹720 |
| 30% + 20% | 50% | 44% | ₹560 |
| 50% + 20% | 70% | 60% | ₹400 |
| 50% + 50% | 100% (free!) | 75% | ₹250 |
| 40% + 10% + 5% | 55% | 48.7% | ₹513 |
Swipe the table sideways to see every column.
Two percentage discounts give the same result in any order. Only the total matters, and it is always less than the two numbers added together.
How to Calculate the Final Price After Discount
The quickest way is to work with the part you pay rather than the part you save. 30% off means you pay 70%, so multiply by 0.70. ₹4,500 at 30% off is 4,500 × 0.70 = ₹3,150.
With GST or sales tax
₹4,500 at 30% off with 18% GST: 4,500 × 0.70 × 1.18 = ₹3,717. Apply the discount first, then the tax.
How to Calculate the Discount Amount
- 15% off ₹840: 840 × 15 ÷ 100 = ₹126 saved.
- Was ₹1,299, now ₹999: 1,299 − 999 = ₹300 saved, which is 23.1% off.
Flat amount vs percentage: which is better?
A flat amount and a percentage break even at flat amount ÷ percentage. For “₹200 off” vs “20% off” that is 200 ÷ 0.20 = ₹1,000. Below ₹1,000 the flat ₹200 saves more; above ₹1,000 the 20% saves more.
How to Calculate Multiple Discounts
- Turn each percentage into what you pay: 30% off → 0.70, 10% off → 0.90, 5% off → 0.95.
- Multiply the original price by each of them in turn.
- Subtract flat amounts at the point they apply (for example cashback after the percentages).
- Add tax on the final pre-tax price, if any.
Example: ₹3,999 shoes, 40% off, then ₹500 cashback. 3,999 × 0.60 = ₹2,399.40, then − ₹500 = ₹1,899.40. The effective discount is 52.5%. If the ₹500 came off first, you would pay (3,999 − 500) × 0.60 = ₹2,099.40, so the order of a flat discount matters.
Discount Calculator Examples
| Question | Working | Answer |
|---|---|---|
| 25% off ₹2,000 | 2,000 × 0.75 | ₹1,500 |
| ₹1,200 now ₹900: what % off? | 300 ÷ 1,200 × 100 | 25% |
| Paid ₹1,440 after 20% off: original? | 1,440 ÷ 0.80 | ₹1,800 |
| 20% + 10% on ₹1,000 | 1,000 × 0.80 × 0.90 | ₹720 (28% off) |
| ₹100 off then 10% on ₹1,000 | 900 × 0.90 | ₹810 |
| 30% off ₹4,500 + 18% GST | 4,500 × 0.70 × 1.18 | ₹3,717 |
| ₹1,00,000 in 5 years at 8% | 1,00,000 ÷ 1.08⁵ | ₹68,058 today |
| 40% margin, 10% discount | 10 ÷ (40 − 10) | +33% sales needed |
Swipe the table sideways to see every column.
Discount Calculator FAQs
Multiply the original price by the discount percentage and divide by 100. That is the amount you save. Subtract it from the original price to get the final price. For example, 25% off ₹2,000 is 2,000 × 25 ÷ 100 = ₹500 off, so you pay ₹1,500.
Discount % = (Original price − Sale price) ÷ Original price × 100. If a ₹1,200 shirt is on sale for ₹900, the discount is (1,200 − 900) ÷ 1,200 × 100 = 25%.
No. The second discount applies to the already reduced price, so 20% then 10% equals 28% off in total, not 30%. On ₹1,000 you pay ₹720 instead of ₹700. The more discounts you stack, the bigger the gap.
Divide the sale price by (1 − discount ÷ 100). If you paid ₹1,440 after 20% off, the original price was 1,440 ÷ 0.80 = ₹1,800. Do not add 20% to the sale price; that gives ₹1,728, which is wrong.
Not when both are percentages: 20% then 10% gives the same price as 10% then 20%. It does matter when one is a flat amount. On ₹1,000, taking ₹100 off first and then 10% gives ₹810, but 10% first and then ₹100 gives ₹800.
It depends on the price. The two are equal at ₹1,000, because 20% of ₹1,000 is ₹200. Below ₹1,000 the flat ₹200 saves more; above ₹1,000 the 20% saves more. In general, divide the flat amount by the percentage to find the break-even price.
In India, a discount given at the time of sale and shown on the invoice reduces the value on which GST is charged, so GST is worked out on the discounted price. The calculator applies tax after the discount by default.
In finance, the discount rate is the yearly rate used to turn a future amount into today’s value. Present value = Future value ÷ (1 + r)ⁿ. At 8%, ₹1,00,000 due in 5 years is worth about ₹68,058 today.
Divide the discount by (gross margin − discount). With a 40% margin, a 10% discount needs 10 ÷ 30 = 33% more units sold just to earn the same gross profit. A 20% discount needs double the sales. The Impact tab works this out for you.
You can type a deal in plain words, such as “₹2,499 with 30% off plus extra 10%”, and the smart reader picks out the price and the discounts and fills in the right calculator. It works inside your browser; nothing you type is sent anywhere.