Discount Calculator | Sale Price & Percent Off Estimator
Calculate final sale price with percent or fixed discounts, including stacked discount scenarios
See total savings and effective discount rate.
When Should You Use This Calculator?
- Working out a sale price from a percent-off or dollar-off discount
- Working backward from a receipt or sale tag to find what percent off was applied
- Stacking a coupon code on top of an already-discounted clearance price
- Comparing a percentage offer against a fixed-amount offer to see which saves more
- Estimating a final checkout total with the discount applied before tax
Key Features:
- Simple mode: percentage (%) or fixed amount ($) discounts, with instant savings and final price
- Optional second stacked discount, applied correctly to the already-discounted price
- Find % Off mode: enter the original and sale price to work out the discount percent
- Copy or export the final price and savings for records
Frequently Asked Questions
How do I calculate a discount?
Formula: Original Price × (Discount Rate / 100) = Discount Amount. Subtract from original to get the sale price. For example, 25% off $80: $80 × 0.25 = $20 off → final price $60.
Can I stack discounts?
Yes, but the order matters. "20% off plus 10% off" is not 30% off. The second discount applies to the already-reduced price: $100 → -20% = $80 → -10% = $72. That is an effective 28% discount, not 30%.
How do I calculate what percentage off an item is?
Percent off = ((Original Price - Sale Price) / Original Price) × 100. For example, an item that was $80 and is now $60: ($20 / $80) × 100 = 25% off. Switch to "Find % Off" mode and enter both prices to get this instantly, without doing the math yourself.
What is the effective discount rate when multiple coupons are stacked?
Effective rate = 1 - (1 - D1) × (1 - D2) × ... for each discount D. For 20% and 10% stacked: 1 - (0.80 × 0.90) = 1 - 0.72 = 28% effective. Turn on "Add Stacked Discount" and enter your two discounts to get this for any combination.
Does the discount apply before or after sales tax?
In most places, sales tax is calculated on the discounted price, not the original price. Apply the discount first to get the sale price, then add tax to that lower amount — not the other way around.
Can I export my Discount Calculator calculations?
Yes. In guest mode you can export your calculations to JSON. Signing in adds PDF and CSV export. Click the export button to download your results — useful for record-keeping, sharing, or importing into other tools.
Does this calculator save my history?
Yes. Your calculation history is saved automatically. As a guest you can keep up to 50 calculations per workspace on your device. Sign in for free to keep up to 100 per workspace and access them from any device.
Is this calculator free to use?
Yes. The Discount Calculator is free to use with no sign-up required. A free account adds more calculation history, multiple workspaces, and access to your saved data from any device.
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