Calculate the final price and amount saved from any percentage off, with optional sales tax.
Percentage off calculations are among the most commonly needed math in everyday life, especially during sales and shopping. The formula is straightforward: Discount Amount = Original Price × (Discount Percentage ÷ 100). The sale price is then: Sale Price = Original Price - Discount Amount.
Example: A $80 item at 25% off has a discount of $80 × 0.25 = $20. The sale price is $80 - $20 = $60. With 8% sales tax, the final price is $60 × 1.08 = $64.80.
Stacking discounts: Some stores offer "extra 20% off sale items." These are typically applied sequentially, not added together. A $100 item marked 30% off is $70. An additional 20% off reduces it to $70 × 0.80 = $56 — not $100 × 0.50 = $50. Sequential discounts always result in a higher final price than adding the percentages.
Quick mental shortcuts: For 10% off, move the decimal one place left ($45 → $4.50 discount). For 20%, double the 10% amount. For 25%, divide by 4. For 50%, divide by 2. For 15%, calculate 10% and add half of that.
Type the pre-discount price. This is the regular price or the price before any sale is applied.
Type the percentage off, like 20% off or 30% off. The calculator handles any value from 1% to 99%.
Get the final price after the discount is applied, the dollar amount saved, and the equivalent fixed amount off for easy comparison.
For related calculations, try our discount calculator.
Cross-checked against authoritative formulas (IRS, NIST, ACM) and updated for 2025/2026 tax years and rates.
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Estimates only. Calculator results are for educational and planning purposes — not professional advice. For binding decisions on taxes, investments, health, or legal matters, consult a qualified professional.