Discount Calculator
Free discount calculator with two modes: (1) original price + discount % to find final sale price and savings; (2) final sale price + discount % to find the original price (reverse). Quick buttons 10/20/25/30/50/70%. 100% browser-based.
Forward: Find Sale Price
Enter the original price and a discount percentage to compute the savings and the final sale price instantly — perfect for shopping.
Reverse: Find Original
Already know the sale price and discount? Reverse-mode recovers the original pre-discount price so you can verify the deal.
Quick Discount Buttons
One-tap presets for common markdowns: 10%, 20%, 25%, 30%, 50%, 70%. Fine-tune any value from 0-100% with the slider.
Clear Savings
See the dollar amount you save alongside the percentage, so you always know exactly how much the discount is worth in real money.
How is the final price calculated?
In forward mode: savings = original × (discount% ÷ 100), and final price = original − savings. For example, a $100 item at 20% off saves $20, final price $80.
How does the reverse mode work?
Given a final sale price and a discount percentage, the original price = final ÷ (1 − discount% ÷ 100). For example, $80 final at 20% off → $80 ÷ 0.80 = $100 original.
What is a "stacked" discount and can this calculator handle it?
Stacked discounts (e.g. 30% off + extra 20% off) are applied sequentially: 100 × 0.70 × 0.80 = $56. To model this, set the discount to 30%, note the result, then enter that as the new original with a 20% discount.
Why does the percentage slider cap at 100%?
A 100% discount means the item is free. Percentages above 100% would imply the seller pays you — not a real discount. The slider is bounded to real-world markdowns.
Is my data private?
Yes. All calculations run entirely in your browser. No prices or discount values are sent anywhere.
Ready to use the Discount Calculator?
Free, no signup, no watermark. 100% browser-based. Your data never leaves your device.
Open the tool