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Discount Calculator

Work out a sale price after one or two stacked discounts and sales tax, find the percent off from an original and sale price, and calculate a tip and split the bill.

Updated November 4, 2026. Free, no sign-up; everything runs in your browser and nothing you type is stored.

Discount calculator

Sale price
–
–You save
–Total discount
–Price with sales tax

Percent off calculator: find the discount

–Percent off
–Amount off

Tip calculator

–Tip
–Total with tip
–Each person pays

How to calculate a discount

Sale price = original price × (1 − discount ÷ 100). $80 at 25% off is $80 × 0.75 = $60, a $20 saving. Stacked discounts multiply rather than add: an extra 10% off the $60 sale price is $54, which is 32.5% off in total, not 35%. Sales tax is charged on the discounted price in most states: $54 plus 8% tax is $58.32. (Manufacturer coupons can be taxed on the pre-coupon price in some states.)

Percent off calculator

To find the discount from two prices: percent off = (original − sale) ÷ original × 100. A $120 jacket on sale for $84 is $36 off, or 30% off. For other percentage math (percent of, increase, change), see the percentage calculator.

Tip calculator: how much to tip

Tip = bill × tip % ÷ 100. A 20% tip on an $86.40 bill is $17.28, making $103.68, or $34.56 each for three people. Quick mental math: move the decimal one place for 10% ($8.64) and double it for 20%. In the US, 15% to 20% of the pre-tax bill is customary for sit-down restaurant service, with 20% common today; many people tip on the pre-tax amount, so enter the bill before tax if you prefer.

Common questions

How do I calculate 25% off?

Multiply the price by 0.75. $80 at 25% off is $60.

Do two discounts add up?

No. 25% off then 10% off is 32.5% off in total (0.75 × 0.9 = 0.675).

How do I find the percent off?

(Original − sale price) ÷ original × 100. $120 to $84 is 30% off.

How much is a 20% tip on $86.40?

$17.28, for a total of $103.68.

Should I tip on the total with tax?

Either is acceptable; many people tip on the pre-tax bill.

Sources

Related

General information, not financial, tax or legal advice. Check important numbers with the official source before acting on them.