Offer Percentage Calculator
An offer price only makes sense next to the original price it was cut from. This calculator turns those two numbers into the exact discount percentage, to two decimal places, and shows the dollar amount you save alongside it, so a $120 jacket at $90 reads as what it really is: 25.00% off, $30.00 kept in your pocket.
Quick Answer
A $120 jacket offered at $90 is 25.00% off: ($120 − $90) ÷ $120 × 100, which leaves $30.00 in your pocket. The tool is pre-filled with this exact case. Two prices in, one exact percentage out, to two decimal places.
Key takeaways
- Offer percentage = (original − offer) ÷ original × 100, measured from the original price, never the sale price.
- A negative result is not a bug: it means the "offer" is above the original price, a markup, not a discount.
- Two decimals stop rounding arguments: 25.00% on $120 is exactly $30.00, while a rounded 25% could hide pennies on large purchases.
- Stacked discounts multiply, they do not add: 20% then 10% is 28% off, not 30%.
How to use the offer percentage calculator
Type in the original price and the offer price, then click Calculate. The result stays hidden until you click, and Reset restores the pre-filled jacket example.
- Enter the original price: the list or sticker price before any cut, for example $120.
- Enter the offer price: the price you would actually pay, for example $90.
- Click Calculate: the tool shows the discount percentage to two decimals, plus the dollar amount you save.
- Copy or share the result straight from the results box when you want to send the deal to someone else.
The offer percentage formula
The discount is the price drop divided by the starting price, times 100. That is the whole calculation, and every percentage tool that reads "original to offer" uses it.
Dollar savings = Original price − Offer price
The order matters. Dividing by the original price is what makes a discount a discount: the $30 cut on a $120 jacket is 25%, but that same $30 cut on a $300 jacket is only 10%. OpenStax works through this exact discount model in its section on discount applications, where the amount of discount is the discount rate times the original price, and Think Academy's percent-change walkthrough shows why measuring from the original value, not the new one, is the step students most often get wrong. If the offer price is higher than the original, the formula gives a negative number: −33.33% on $90 rising to $120 means a 33.33% price increase.
Worked example: the $120 jacket at $90
Every number below is the calculator's own output for the pre-filled inputs.
- Price drop = $120.00 − $90.00 = $30.00
- Discount percentage = ($30.00 ÷ $120.00) × 100 = 25.00%
- Copy text = "Offer percentage: 25.00% off ($120.00 reduced to $90.00). You save $30.00 on the $120.00 original price."
Running the same arithmetic on a $200 item at $150 gives 25.00% and $50.00 saved; a free item at $0 gives 100.00%, the maximum a discount can reach before the offer price goes negative.
Discount reference table
The most common discount rates on three price points, so you can sanity-check a store sign without touching the tool.
| Discount | $100 item | $200 item | $500 item |
|---|---|---|---|
| 10% off | $90.00 (save $10.00) | $180.00 (save $20.00) | $450.00 (save $50.00) |
| 20% off | $80.00 (save $20.00) | $160.00 (save $40.00) | $400.00 (save $100.00) |
| 25% off | $75.00 (save $25.00) | $150.00 (save $50.00) | $375.00 (save $125.00) |
| 30% off | $70.00 (save $30.00) | $140.00 (save $60.00) | $350.00 (save $150.00) |
| 50% off | $50.00 (save $50.00) | $100.00 (save $100.00) | $250.00 (save $250.00) |
What competing calculators miss
The top results for this keyword each cover one slice of discount math and leave the rest to you:
- Pearson's discount calculator: strong multi-mode design (% off, $ off, final → %, stacked discounts, tax), but you must pick the right mode first; the "final → %" mode is this page's whole job, buried among four.
- CalculatorSoup: solves all three directions (discount, sale price, list price) with worked algebra, but the page is formula-dense and the answer is not the visual focus.
- BharatERP's percentage-off tool: adds successive discounts and a reverse calculation, yet defaults to rupees, and the extra "additional off" field confuses the one-question flow.
- CalculatorDaily's percent-off calculator: clean auto-calculation with "you save" shown, but no copy button and no explanation of negative results.
- ToolsZone's percentage calculator: a whole percent suite on one page, which is useful until you have to find the discount widget among six others.
- Cuemath's guide: excellent formula teaching with worked examples, but no interactive tool at all.
- The gap this page fills: one question, answered instantly and precisely: two prices in, the exact percentage to two decimals out, with the dollar savings on the same screen, copy and share built in, and the negative-result case explained instead of hidden.
One honest limit: this tool answers "what percent off is this offer". To run the question backwards, starting from a discount percent to find the final price, use the discount percent calculator. If you are a seller setting prices from a margin target rather than cutting them, the margin discount calculator works that direction, and the 15 discount calculator is the quick check for the single most common store rate.
Frequently asked questions
Subtract the offer price from the original price, divide by the original price, and multiply by 100. For a $120 jacket offered at $90: ($120 − $90) ÷ $120 × 100 = 25.00%.
It means the offer is above the original price: a price increase, not a discount. An "offer" of $120 on a $90 item reads −33.33%, which is a 33.33% markup.
So the percentage and the dollar savings always agree. On large purchases a rounded 25% can hide real money: 24.97% versus 25.03% is a $1.20 swing on a $2,000 item.
Multiply the original price by (1 − discount ÷ 100). A 25% discount on $120 is $120 × 0.75 = $90. This page answers the opposite question: given the two prices, what was the percent?
Not by adding them. Each discount applies to the already-reduced price, so 20% then 10% on $100 gives $80 then $72: a 28% total discount, not 30%. Enter the final $72 as the offer price to see 28.00%.
No. Enter pre-tax prices for both fields so the percentage reflects the discount itself. Tax applies to the final price after the discount, and rates vary by location.
Because the original price is the reference the store set. Measuring from the sale price would inflate every discount: the $30 cut on the $90 sale price would read 33.33% instead of the true 25%.
Run each one through the calculator and compare the percentages, not the dollar savings. A $40 saving on a $400 item (10%) is a worse deal than a $30 saving on a $120 item (25%).
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References
- OpenStax, Prealgebra 2e. 6.3 Solve Sales Tax, Commission, and Discount Applications. Accessed October 23, 2026.
- Khan Academy. Percentage Change Word Problems (Discount and Commission). Accessed October 23, 2026.
- Think Academy. Percentages in Word Problems Explained and Worked Examples. Accessed October 23, 2026.
- Cuemath. Calculating Discounts: Percentage, Formula, How to Calculate. Accessed October 23, 2026.
- Open Up Resources, Grade 6 Accelerated Math. Unit 6 Section C Lesson 8: Percent Increase, Decrease, Discount and Markup. Accessed October 23, 2026.