Discount Calculator
Calculate sale price, amount saved, percent off, or reverse-calculate the original price — four modes in one tool. Enter any two values and find the third. Every result comes with a visual savings breakdown and plain-English explanation.
Choose a calculation mode
Pick what you want to find out. Enter two known values and the calculator finds the third.
Know the original price and discount percentage. Find the sale price.
Know the original price and discount percentage. Find how much you save in dollars.
Know the original and sale prices. Find what percentage off was applied.
Know the sale price and discount percentage. Work backwards to find the original price.
Four modes explained
Sale Price — original × (1 − %/100)
Amount Saved — original × %/100
Percent Off — (original − sale) ÷ original × 100
Original Price — sale ÷ (1 − %/100)
When to use each mode
Use Sale Price for shopping. Use Amount Saved to compare deals. Use Percent Off when a tag shows only the sale price. Use Original Price to reverse-calculate a pre-sale price.
Discount formulas
Example: $120 original, 25% off → sale price = $120 × 0.75 = $90, amount saved = $120 × 0.25 = $30.
How to handle stacked discounts
When a retailer applies two discounts in sequence (e.g., 20% off, then an extra 10% off the discounted price), you cannot simply add them together. A 20% + 10% stack is not 30% off — it is 28% off.
To calculate stacked discounts, run each step separately using the output of one calculation as the original price for the next.
Frequently asked questions
How do I calculate the sale price after a discount?
Multiply the original price by (1 − discount percentage ÷ 100). For a 25% discount on $120: $120 × (1 − 0.25) = $120 × 0.75 = $90. Alternatively: subtract the amount saved from the original price.
How do I find the original price if I only know the sale price and discount?
Divide the sale price by (1 − discount ÷ 100). If something costs $90 after a 25% discount: $90 ÷ 0.75 = $120 original price. This is the "Original Price" mode in this calculator.
How do I calculate percent off from two prices?
Subtract the sale price from the original price, divide by the original price, then multiply by 100. For $90 sale on a $120 item: ($120 − $90) ÷ $120 × 100 = $30 ÷ $120 × 100 = 25% off.
Are stacked discounts the same as adding the percentages?
No. A 20% discount followed by an additional 10% off equals 28% total off — not 30%. Each successive discount applies to the already-reduced price, not the original. To calculate, apply each discount step by step.
Does this calculator include tax?
No — this calculator works on the pre-tax price only. If you need the final cost after tax, add the applicable sales tax percentage to the sale price result. For example, $90 sale price + 8% tax = $90 × 1.08 = $97.20.
Related finance calculators
These tools pair naturally with discount calculations.
Disclaimer
All calculations assume a simple percentage-off discount with no stacking, tax, shipping, or tiered pricing. For stacked promotions, calculate each discount step separately. Results are for planning and estimation purposes only.