Discount Calculator
The discount calculator finds your sale price, discount amount, and percentage saved in seconds. Enter the original price and the discount percentage — the calculator returns the exact sale price and how much you save. No signup required, and it works for any currency.
Whether you are shopping and want to know the final price after a 20% off sale, a retailer setting promotional prices, or a student calculating percentage discount for a maths problem, this discount calculator handles it instantly. You can also run it in reverse: enter the original price and the sale price to find the discount percentage, or enter the sale price and discount percentage to find the original price before discount.
Also useful: our Markup Calculator helps you calculate selling price and gross profit margin from any cost and markup, and our Stripe Fee Calculator shows your exact net payout after payment processing fees on any sale.
Discount Calculator
Calculate sale price, savings amount, and discount percentage instantly.
Find Original Price
Know the sale price and discount? Work backwards to find the original.
Multi-Item Discount Calculator
Calculate discounts on multiple items at once — see total savings.
| Item | Price ($) | Discount | Sale Price | Savings |
|---|
What Is a Discount Calculator?
A discount calculator is a tool that finds the sale price, discount amount, or original price when you know two of the three variables. The core calculation is straightforward:
Sale Price Formula
Original Price − (Original Price × Discount %)
For example: an item costs $80 and is on sale for 25% off. The discount amount is $80 × 25% = $20. The sale price is $80 − $20 = $60. This discount calculator does the arithmetic instantly for any price and any percentage.
Where a percentage discount calculator becomes especially useful is in the reverse directions — finding the discount percentage when you know both prices, or finding the original price before a reduction was applied when you know only the sale price and the percentage off. These reverse calculations are less intuitive to do manually and are where most errors occur.
This tool also handles tax: toggle the tax option to include your local sales tax rate, and it calculates the final price after both the discount and the tax are applied — in the correct order.
How to Calculate Discount Percentage — Step by Step
Understanding the manual method helps you verify results and builds confidence in the numbers. There are three types of discount calculation, each used in different situations.
Discount Amount = Original Price × (Discount % ÷ 100)
Sale Price = Original Price − Discount Amount
Combined into one step:
Sale Price = Original Price × (1 − Discount % ÷ 100)
Example: Original price $120, discount 30%. Sale price = $120 × (1 − 0.30) = $120 × 0.70 = $84. Discount amount = $120 − $84 = $36.
Discount % = ((Original Price − Sale Price) ÷ Original Price) × 100
Example: Original price $150, sale price $105. Discount amount = $150 − $105 = $45. Discount % = ($45 ÷ $150) × 100 = 30%.
Original Price = Sale Price ÷ (1 − Discount % ÷ 100)
Example: Sale price $63, discount 30%. Original price = $63 ÷ (1 − 0.30) = $63 ÷ 0.70 = $90. This confirms that $90 minus 30% equals $63.
How to Use This Discount Calculator
This discount calculator has three modes. Choose the one that matches what you know and what you need to find:
Mode 1 — Find the Sale Price (Original Price + Discount %)
The standard mode. Enter the original price and the discount percentage — the calculator returns the sale price, the dollar amount saved, and confirms the percentage off.
- Enter the original price
- Enter the discount percentage
- The calculator returns the sale price, dollar amount saved, and confirms the percentage off
Example: Original price $200, discount 15%. Sale price = $170. You save $30.00 — that is 15% of $200.
Mode 2 — Find the Discount Percentage (Two Prices)
Enter the original price and the sale price — the calculator finds the exact percentage that was discounted.
- Enter the original price
- Enter the sale price
- The calculator returns the discount percentage and the dollar amount saved
Example: Was $180, now $126. Discount = ($180 − $126) ÷ $180 × 100 = 30% off. You are saving $54.
Mode 3 — Find the Original Price Before Discount
Enter the sale price and the discount percentage — the calculator works backward to find the original price before the reduction was applied.
- Enter the sale price
- Enter the discount percentage
- The calculator returns the original price before discount and the dollar amount you are saving
Example: Sale price $51, discount 15%. Original price = $51 ÷ 0.85 = $60.00. The item was originally $60 and was reduced by $9.
Discount Calculator with Tax
When a discount is applied before tax, the tax is calculated on the reduced sale price, not the original price. This is the standard approach in retail. When a discount is applied after tax, the tax is calculated on the full original price and the discount is taken off the total.
Most retail discounts and promotional codes apply the percentage off before tax. This means a 20% discount on a $100 item gives you an $80 sale price, and tax — say 8% — is then applied to $80, giving a final total of $86.40. The calculation order matters particularly when the discount is a fixed dollar amount rather than a percentage, since the arithmetic differs.
Final Price with Tax (discount before tax)
(Original Price × (1 − Discount %)) × (1 + Tax Rate %)
Example: $100 item, 20% discount, 8% sales tax. Sale price = $100 × 0.80 = $80.00. Final price with tax = $80 × 1.08 = $86.40.
Toggle the tax option in the discount calculator above to include sales tax in your calculation. Enter your local tax rate and the final price including tax is calculated automatically alongside the discount.
Discount Percentage Reference Table
Here are the sale prices for the most commonly used discount percentages across a range of original prices. All figures are before tax. Use the discount calculator above for any price and percentage combination not listed here.
| Original Price | 10% Off | 15% Off | 20% Off | 25% Off | 30% Off | 50% Off |
|---|---|---|---|---|---|---|
| $20 | $18.00 | $17.00 | $16.00 | $15.00 | $14.00 | $10.00 |
| $50 | $45.00 | $42.50 | $40.00 | $37.50 | $35.00 | $25.00 |
| $100 | $90.00 | $85.00 | $80.00 | $75.00 | $70.00 | $50.00 |
| $150 | $135.00 | $127.50 | $120.00 | $112.50 | $105.00 | $75.00 |
| $200 | $180.00 | $170.00 | $160.00 | $150.00 | $140.00 | $100.00 |
| $500 | $450.00 | $425.00 | $400.00 | $375.00 | $350.00 | $250.00 |
| $1,000 | $900.00 | $850.00 | $800.00 | $750.00 | $700.00 | $500.00 |
All figures are before tax. Use the discount calculator above for any price and percentage combination not listed here.
How to Calculate Discount Percentage — Common Examples
For the five most commonly searched discount percentages, here is the formula, a worked example, and the mental shortcut for calculating each one quickly without a tool.
10% Discount Calculator
A 10% discount is the easiest to calculate mentally: move the decimal point one place to the left on the original price to find the discount amount, then subtract from the original price.
Example: $85 with 10% off. Discount amount = $8.50. Sale price = $85 − $8.50 = $76.50.
Mental shortcut: $85 → move decimal → $8.50 → subtract → $76.50.
10% Discount
Sale Price = Original Price × 0.90
20% Discount Calculator
For 20% off: calculate 10% first (move the decimal point left one place), then double it to get the 20% discount amount. Subtract from the original price. Or simply multiply by 0.80.
Example: $65 with 20% off. 10% of $65 = $6.50. 20% = $6.50 × 2 = $13.00. Sale price = $65 − $13.00 = $52.00. Or: $65 × 0.80 = $52.00.
20% Discount
Sale Price = Original Price × 0.80
25% Discount Calculator
For 25% off: divide the original price by 4 to find the discount amount, then subtract. This works because 25% = 1/4. Or multiply by 0.75.
Example: $120 with 25% off. Discount amount = $120 ÷ 4 = $30. Sale price = $120 − $30 = $90. Or: $120 × 0.75 = $90.
25% Discount
Sale Price = Original Price × 0.75
30% Discount Calculator
For 30% off: calculate 10% (move the decimal left), multiply by 3 to get the 30% discount amount, then subtract. Or multiply the original price by 0.70.
Example: $200 with 30% off. 10% of $200 = $20. 30% = $20 × 3 = $60. Sale price = $200 − $60 = $140. Or: $200 × 0.70 = $140.
30% Discount
Sale Price = Original Price × 0.70
50% Discount Calculator
For 50% off: simply divide the original price by 2. A 50% discount is half price, which is the simplest of all percentage calculations.
Example: $180 with 50% off. Sale price = $180 ÷ 2 = $90.00. The discount amount is also $90 — exactly half the original price.
50% Discount
Sale Price = Original Price ÷ 2
Calculating a Percentage Discount — Discount vs Markdown vs Rebate
The terms discount, markdown, coupon, and rebate are often used interchangeably in everyday language, but they mean different things in retail and accounting. Understanding the distinction helps you calculate the true saving in each case.
| Term | Definition | When Applied | Example |
|---|---|---|---|
| Discount | Reduction from the original price | At point of sale | 20% off a $50 item = $40 |
| Markdown | Permanent price reduction from retail price | Price tag change | MSRP $100 marked down to $75 |
| Rebate | Partial refund after purchase | After purchase (mail-in or instant) | $20 rebate on a $120 item — pay $120, get $20 back |
| Coupon | Fixed dollar or percentage off applied at checkout | At checkout | 15% off coupon on a $60 order = $51 |
For calculating a percentage discount, use the standard formula regardless of whether the reduction is called a discount, markdown, or promotional price. The arithmetic is the same: (Original Price − Sale Price) ÷ Original Price × 100 gives you the percentage off in all cases.
Rebates are different because the reduction does not happen at the point of purchase — you pay the full price and receive money back afterward. To find the effective discount percentage on a rebate offer, treat the rebate amount as the discount amount and apply the same formula.
5 Tips for Getting the Best Discount
- Stack discounts where allowed. Some retailers allow a percentage coupon to be applied on top of an already-marked-down sale price. Use this discount calculator to check the combined saving before you buy — a 20% coupon on a 30%-off item does not equal 50% off the original price; it equals 44% off. You pay 70% of the original price after the first discount, then 80% of that amount after the coupon, which equals 56% of the original — a 44% total reduction, not 50%.
- Calculate the unit price after discount when buying in bulk. A 3-for-2 deal gives 33.3% off the third item only, not 33.3% off the entire purchase. Divide the total price by the number of units to find the true discounted unit price and compare it against competitors before committing.
- Check whether the discount applies before or after tax. On a large purchase, the difference can be significant. A percentage off before tax means you pay tax on the lower price. A percentage off after tax means you pay full tax first, then the reduction comes off — same effective total for percentage discounts, but the calculation order matters for fixed-dollar discounts and rebates.
- Verify the “original price” being used as the reference. Sale signage sometimes uses a higher reference price — MSRP or a “was” price — that the item has rarely or never actually sold at. Use Mode 2 in this discount calculator to verify what the real percentage off is from the last known genuine selling price and compare the sale price against other retailers.
- Calculate cost-per-use for big-ticket discounted items. A 40% discount on a $500 item saves $200, which looks significant. But if you use the item only twice, your cost-per-use is still $150. Run the discounted price against your expected frequency of use to decide whether the saving justifies the purchase, rather than buying based on the discount percentage alone.
Frequently Asked Questions
How do I calculate a discount percentage?
To calculate the discount percentage between two prices: subtract the sale price from the original price to find the discount amount, then divide that amount by the original price and multiply by 100. Formula: Discount % = ((Original Price − Sale Price) ÷ Original Price) × 100. Example: original price $80, sale price $60. Discount amount = $80 − $60 = $20. Discount % = ($20 ÷ $80) × 100 = 25%. Use Mode 2 in the discount calculator above to calculate this instantly.
How do I calculate the sale price from a percentage off?
Multiply the original price by (1 minus the discount percentage expressed as a decimal). Formula: Sale Price = Original Price × (1 − Discount % ÷ 100). Example: $150 with 20% off. Sale price = $150 × (1 − 0.20) = $150 × 0.80 = $120. Alternatively: find 20% of $150 ($30) and subtract from the original — $150 − $30 = $120. Both methods give the same result.
How do I find the original price before discount?
Divide the sale price by (1 minus the discount percentage expressed as a decimal). Formula: Original Price = Sale Price ÷ (1 − Discount % ÷ 100). Example: sale price $75, discount 25%. Original price = $75 ÷ (1 − 0.25) = $75 ÷ 0.75 = $100. You can verify this: $100 minus 25% ($25) = $75. Use Mode 3 in the discount calculator above to find the original price instantly from any sale price and percentage.
How do I calculate a 10% discount?
Move the decimal point one place to the left on the original price — that gives you the 10% discount amount. Subtract it from the original price to get the sale price. Example: $85 with 10% off. 10% of $85 = $8.50. Sale price = $85 − $8.50 = $76.50. Or multiply by 0.90: $85 × 0.90 = $76.50. The “move the decimal” shortcut works for any price and is the fastest mental method for 10% off.
How do I calculate a 20% discount?
Multiply the original price by 0.80. Or: find 10% of the original price (move the decimal left one place) and double it to get the 20% discount amount, then subtract from the original price. Example: $65 with 20% off. 10% of $65 = $6.50. Double it: 20% = $13.00. Sale price = $65 − $13.00 = $52.00. Or: $65 × 0.80 = $52.00.
How do I calculate a 25% discount?
Divide the original price by 4 to find the discount amount, then subtract from the original price. This works because 25% is exactly one quarter. Or multiply by 0.75 to jump straight to the sale price. Example: $120 with 25% off. $120 ÷ 4 = $30. Sale price = $120 − $30 = $90.00. Or: $120 × 0.75 = $90.00.
How do I calculate a 30% discount?
Multiply the original price by 0.70. Or: find 10% of the original price and multiply by 3 to get the 30% discount amount, then subtract. Example: $200 with 30% off. 10% of $200 = $20. 30% = $20 × 3 = $60. Sale price = $200 − $60 = $140.00. Or: $200 × 0.70 = $140.00.
How do I calculate a 50% discount?
Divide the original price by 2. A 50% discount is half price — the simplest percentage calculation. Example: $180 with 50% off. Sale price = $180 ÷ 2 = $90.00. The discount amount equals the sale price: you pay exactly half the original price and save exactly half.
How do I calculate the price after discount with tax?
When discount is applied before tax — the standard retail approach — first apply the percentage off to the original price to get the sale price, then apply the tax rate to the sale price. Formula: Final Price = (Original Price × (1 − Discount %)) × (1 + Tax Rate %). Example: $100 item, 20% off, 8% tax. Sale price = $100 × 0.80 = $80.00. Final price with tax = $80 × 1.08 = $86.40. Toggle the tax option in the discount calculator above and enter your local tax rate to include it automatically.
What is the formula for calculating a percentage discount?
There are three discount formulas depending on which value you need to find: (1) To find the sale price when you know the original price and discount %: Sale Price = Original Price × (1 − Discount % ÷ 100). (2) To find the discount percentage when you know both prices: Discount % = ((Original Price − Sale Price) ÷ Original Price) × 100. (3) To find the original price when you know the sale price and discount %: Original Price = Sale Price ÷ (1 − Discount % ÷ 100). The discount calculator above selects the correct formula automatically based on which mode you choose.
What is the difference between a discount and a markdown?
A discount is a temporary price reduction applied at the point of sale — a percentage or fixed amount off the current price for a limited promotional period. A markdown is a permanent reduction in the listed retail price, where the price tag itself is changed to reflect a lower ongoing price. Both reduce what the buyer pays, and both use the same percentage discount formula to calculate the saving. The distinction matters in retail accounting and inventory valuation but does not affect the arithmetic of calculating the percentage off or the final sale price.
How do stacked discounts work?
Stacked discounts do not simply add together. A 20% discount followed by a further 10% off does not equal 30% off the original price — it equals 28% off. After the first 20% discount, you are paying 80% of the original. A further 10% off that 80% equals an additional 8% off the original. Total saving: 20% + 8% = 28% of the original price. Formula for two stacked discounts: Combined saving % = 100 − ((1 − Discount 1 ÷ 100) × (1 − Discount 2 ÷ 100) × 100). The more discounts you stack, the bigger the gap between the arithmetic sum and the true combined percentage off.
Can I use this discount calculator for any currency?
Yes — this discount calculator works for any currency. The percentage discount formula is the same regardless of whether the price is in US dollars, British pounds, euros, Indian rupees, or any other currency. Enter your price in whatever currency you are working in and the calculator returns the discount amount and sale price in the same currency. No currency conversion is applied.