Discount Calculator

Calculate the final price, your savings, and add sales tax — with support for multi-tier discounts like "extra 20% off already-reduced price".

Multi-Tier Discounts (extra % off already-reduced price)

Example: original $100 → 20% off = $80 → extra 10% off = $72. Tiers stack multiplicatively in the order listed.

How the Discount Calculator Works

Enter the original price of an item and your first discount — either as a percentage (like "25% off") or a fixed dollar amount (like "$15 off"). The calculator instantly shows the final price, the amount you saved, and the total savings percentage relative to the original sticker price. Everything is computed locally in your browser; no data is sent anywhere.

Multi-Tier Discounts: "Extra % Off Already-Reduced Price"

Retailers love stacking discounts — "Take an extra 20% off already-reduced clearance items", or "Buy one, get an additional 15% off at checkout". These are multiplicative discounts, not additive. A 30% off promotion followed by an extra 20% off does not equal 50% off — it equals 44% off, because the second discount applies to the price after the first discount. Click + Add Tier to add as many extra discount steps as you need; the calculator applies them in sequence and shows the running total so you can see exactly how the price drops tier by tier.

Formula for stacked percentage discounts: Final Price = Original × (1 − d₁) × (1 − d₂) × … × (1 − dₙ), where each d is a discount rate expressed as a decimal (20% = 0.20).

Sales Tax and Final Out-the-Door Price

Check Include Sales Tax and enter your local sales tax rate to see the final amount you'll actually pay at the register. Sales tax is applied to the discounted price, not the original price — which is one reason discounts feel even better than the sticker suggests. The combined state + average local sales tax rate in the United States ranges from about 4% (Oregon-style states with no state sales tax but local levies) up to over 9.5% in Tennessee, Arkansas, and Washington. Use the rate that applies where you live, or where you'll make the purchase if buying online from a retailer that charges tax based on ship-to address.

Common Discount Scenarios

Discount Calculator FAQ

How do I calculate a discount percentage manually?
Multiply the original price by the discount rate (as a decimal), then subtract that from the original price. Example: 25% off $80 → 80 × 0.25 = $20 saved → final price $60.
Are multi-tier discounts additive or multiplicative?
Multiplicative. "20% off, then extra 10% off" on $100 gives $80 → $72 (28% total savings), not $70 (30% total savings). Each tier applies to the price after the previous tier.
Is sales tax applied before or after the discount?
After. Sales tax is calculated on the final discounted price you actually pay, not the original sticker price. This calculator applies tax only to the post-discount amount.
What's a good way to combine a percent-off code with a fixed-dollar coupon?
Order can matter slightly. As a rule of thumb, apply fixed-dollar coupons first to reduce the base, then apply percentage discounts on what remains. Use the first discount dropdown and add tiers to model the exact sequence a retailer will use at checkout.
Does this calculator work for BOGO (buy one get one) deals?
For a BOGO 50% off deal, treat the average discount per item as 25% off and enter that as a single percentage tier. True "buy one get one free" equals 50% off when buying two of equal price.
What's the formula for calculating a single percentage discount?
Final Price = Original Price × (1 − Discount %). Savings = Original Price × Discount %. Example: $120 at 25% off → Final = 120 × 0.75 = $90. Savings = 120 × 0.25 = $30. This calculator handles it instantly and shows the step-by-step math.
How do stacked discounts work mathematically?
Each successive percentage tier applies to the already-reduced price: Final = Original × (1−d₁) × (1−d₂) × ... × (1−dₙ). '30% off, then extra 20% off' on $100 → $100 × 0.70 = $70 → $70 × 0.80 = $56. Total savings = 44%, not 50%, because the second discount applies to the already-reduced $70, not the original $100.

How to Use the Discount Calculator

  1. Enter the original price of the item you're considering purchasing.
  2. Choose your first discount type — percentage off (e.g., "25% off") or a fixed dollar amount (e.g., "$15 off").
  3. Enter the discount value — the percentage or dollar amount of the first discount.
  4. Add extra discount tiers if the promotion includes stacked discounts ("extra 20% off already-reduced price"). Click "+ Add Tier" for each additional discount.
  5. Toggle sales tax on and enter your local rate to see the true out-the-door price including tax on the discounted amount.

The calculator instantly shows the final price, total savings, savings percentage, and — when tax is enabled — the tax amount and grand total. All tiers apply multiplicatively in sequence, exactly as a retailer's point-of-sale system would process them at checkout. Experiment with different tier orders to see how the sequence affects the final price.

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