How to Use the Discount Calculator
- Enter the original price from the tag.
- Tap a % off or type your own. Use + Add another discount or coupon for "extra 20% off" deals and $-off coupons; they're applied in order, just like at the register.
- Pick your state under Sales tax to see what you'll actually pay at checkout.
- Switch tabs to find what % off a sale price is, compare two deals such as BOGO vs 30% off, or keep a running cart total while you shop.
How to Calculate a Discount (Percent Off)
Multiply the price by the percent off to get the savings, then subtract it: sale price = price × (1 − discount ÷ 100). A $80 jacket at 25% off saves $20 and costs $60. A shortcut: for 20% off multiply by 0.8, for 30% off by 0.7, for 40% off by 0.6.
- 30% off $40 = $40 × 0.7 = $28 (you save $12)
- 20% off $50 = $50 × 0.8 = $40 (you save $10)
- 25% off $60 = $60 × 0.75 = $45 (you save $15)
- 40% off $30 = $30 × 0.6 = $18 (you save $12)
How to Find the Percent Off (Discount Percentage)
To find what percent off a sale is, subtract the sale price from the original price, divide by the original price and multiply by 100: percent off = (original − sale) ÷ original × 100. A $80 item on sale for $60 is ($80 − $60) ÷ $80 × 100 = 25% off. Use the % off tab above to do it instantly, or to work backwards from a sale price to the original price.
How to Find the Sale Price
The sale price is what you pay after the discount and before tax: sale price = original price − (original price × percent off ÷ 100). If the sale price and the percent off are known, the original price is sale price ÷ (1 − percent off ÷ 100): a $60 sale price at 25% off means the original was $80.
Double Discounts: Stacked Discounts Don't Add Up
"40% off plus an extra 20% off" sounds like 60% off, but the second discount is taken from the already-reduced price. On a $100 item: 40% off gives $60, and 20% off $60 gives $48. That's a true discount of 52%, not 60%. The calculator shows the real percentage and each step, so you can check the register.
Quick rule: to combine two discounts, multiply what's left: (1 − 0.40) × (1 − 0.20) = 0.48, so you pay 48% of the price.
Does the Order of Coupons Matter?
For two percentage discounts, no: 40% then 20% gives the same price as 20% then 40%. But when you mix a $-off coupon with a % off sale, order matters. On a $100 item with 50% off and a $10 coupon, taking the $10 off first gives $45; taking it off after the 50% gives $40. Stores usually apply the percentage first, which is the better deal for you. When both are present, the calculator shows both totals.
Discount Calculator With Tax: Sales Tax on Discounted Items
Sales tax is charged on the price after store discounts and store coupons. Manufacturer coupons are different: in most states the store is reimbursed for them, so tax is charged on the price before the coupon. Tick the manufacturer-coupon box to see the exact register total. Statewide rates used by the calculator:
| State | Rate | State | Rate |
|---|---|---|---|
| Alabama | 4% | Montana | 0% |
| Alaska | 0% | Nebraska | 5.5% |
| Arizona | 5.6% | Nevada | 6.85% |
| Arkansas | 6.5% | New Hampshire | 0% |
| California | 7.25% | New Jersey | 6.625% |
| Colorado | 2.9% | New Mexico | 4.875% |
| Connecticut | 6.35% | New York | 4% |
| Delaware | 0% | North Carolina | 4.75% |
| District of Columbia | 6% | North Dakota | 5% |
| Florida | 6% | Ohio | 5.75% |
| Georgia | 4% | Oklahoma | 4.5% |
| Hawaii | 4% | Oregon | 0% |
| Idaho | 6% | Pennsylvania | 6% |
| Illinois | 6.25% | Rhode Island | 7% |
| Indiana | 7% | South Carolina | 6% |
| Iowa | 6% | South Dakota | 4.2% |
| Kansas | 6.5% | Tennessee | 7% |
| Kentucky | 6% | Texas | 6.25% |
| Louisiana | 5% | Utah | 6.1% |
| Maine | 5.5% | Vermont | 6% |
| Maryland | 6% | Virginia | 5.3% |
| Massachusetts | 6.25% | Washington | 6.5% |
| Michigan | 6% | West Virginia | 6% |
| Minnesota | 6.875% | Wisconsin | 5% |
| Mississippi | 7% | Wyoming | 4% |
| Missouri | 4.225% |
Rates are statewide minimums as of October 2026 (California, Utah and Virginia include their mandatory statewide local rate). Most cities and counties add local tax on top.
BOGO, Multi-Buy and "X for $Y" Deals
Buy one, get one free is 50% off when you buy two, but only 33% off if you buy three. Buy one, get one 50% off is 25% off a pair. "2 for $5" on a $3 item saves $1 per pair. The Compare deals tab works out the real cost for the number of items you actually need, so you can see whether a BOGO beats a flat percentage.
Percent Off Chart
Sale prices for common prices and discounts. Find the original price in the left column and read across: for example, 30% off $40 is $28 and 50% off $70 is $35.
| Price | 10% off | 15% off | 20% off | 25% off | 30% off | 40% off | 50% off | 60% off | 70% off |
|---|---|---|---|---|---|---|---|---|---|
| $15.00 | $13.50 | $12.75 | $12.00 | $11.25 | $10.50 | $9.00 | $7.50 | $6.00 | $4.50 |
| $20.00 | $18.00 | $17.00 | $16.00 | $15.00 | $14.00 | $12.00 | $10.00 | $8.00 | $6.00 |
| $25.00 | $22.50 | $21.25 | $20.00 | $18.75 | $17.50 | $15.00 | $12.50 | $10.00 | $7.50 |
| $30.00 | $27.00 | $25.50 | $24.00 | $22.50 | $21.00 | $18.00 | $15.00 | $12.00 | $9.00 |
| $35.00 | $31.50 | $29.75 | $28.00 | $26.25 | $24.50 | $21.00 | $17.50 | $14.00 | $10.50 |
| $40.00 | $36.00 | $34.00 | $32.00 | $30.00 | $28.00 | $24.00 | $20.00 | $16.00 | $12.00 |
| $50.00 | $45.00 | $42.50 | $40.00 | $37.50 | $35.00 | $30.00 | $25.00 | $20.00 | $15.00 |
| $60.00 | $54.00 | $51.00 | $48.00 | $45.00 | $42.00 | $36.00 | $30.00 | $24.00 | $18.00 |
| $70.00 | $63.00 | $59.50 | $56.00 | $52.50 | $49.00 | $42.00 | $35.00 | $28.00 | $21.00 |
| $80.00 | $72.00 | $68.00 | $64.00 | $60.00 | $56.00 | $48.00 | $40.00 | $32.00 | $24.00 |
| $100.00 | $90.00 | $85.00 | $80.00 | $75.00 | $70.00 | $60.00 | $50.00 | $40.00 | $30.00 |
| $150.00 | $135.00 | $127.50 | $120.00 | $112.50 | $105.00 | $90.00 | $75.00 | $60.00 | $45.00 |
| $200.00 | $180.00 | $170.00 | $160.00 | $150.00 | $140.00 | $120.00 | $100.00 | $80.00 | $60.00 |
Works on Your Phone in the Store
The calculator is designed for one-handed use in the aisle: a number keypad, big tap targets, instant results and a summary bar that stays visible while you scroll. It works offline once loaded, and nothing you enter leaves your phone.
Frequently Asked Questions
How do I calculate 20% off a price?
Multiply the price by 0.8. For example, 20% off $45 is $45 × 0.8 = $36, a saving of $9.
What is 30% off $40?
30% off $40 is $28. The discount is $40 × 0.30 = $12, and $40 − $12 = $28.
How do you find the percent off?
Subtract the sale price from the original price, divide by the original price and multiply by 100. A $50 item on sale for $35 is ($50 − $35) ÷ $50 × 100 = 30% off.
Is 40% off plus 20% off the same as 60% off?
No. The extra 20% is taken from the already-reduced price, so 40% then 20% equals 52% off in total. On $100 you pay $48, not $40.
How do I find the percent off from the sale price?
Subtract the sale price from the original price and divide by the original price. $80 reduced to $60 is ($80 − $60) ÷ $80 = 25% off.
Is sales tax calculated before or after a discount?
After store discounts and store coupons. For manufacturer coupons, most states charge tax on the price before the coupon.
How do I find the original price before a discount?
Divide the sale price by (1 − discount). A $60 item that is 25% off was originally $60 ÷ 0.75 = $80.
Is buy one get one free the same as 50% off?
Only when you buy an even number of items. Two items at BOGO is 50% off; three items is 33% off because you pay for two.
Should a $10 coupon be applied before or after a percent-off sale?
You pay less when the percentage is applied first and the $10 coupon second. Most stores do it that way.
Written by Prakhar Singh, software engineer and creator of K4Converter · Last updated October 2026