Discount Calculator

How the Discount Calculator Works

Enter the original price and select a discount percentage using the preset pills (10%, 15%, 20%, 25%, 30%, 50%) or type a custom value. The calculator instantly shows how much you save and the final price after the discount.

Toggle the tax option to add Québec taxes (GST 5% + QST 9.975% = 14.975%) on top of the discounted price — useful when shopping in stores that apply taxes after discounts.

Smart Shopping: Making the Most of Discounts

Retailers understand a cognitive bias called anchoring: when you see a jacket originally priced at $200 marked down to $120, your brain anchors to $200 and registers $120 as a deal — even if the jacket's fair market value was never really $200. This is why "original prices" on sale tags are often inflated before discount events like Black Friday. A discount calculator cuts through the anchoring effect by showing you the actual dollars saved and the real final price, letting you evaluate whether the discounted price fits your budget — independent of what the tag says was the original price.

Savvy shoppers also know how to stack discounts to maximize savings. Stacking means combining multiple discount mechanisms on a single purchase: for example, applying a store coupon on top of a sale price, then using a cashback credit card for an additional 2–3% back, and finally activating a cashback portal rebate before checkout.

When evaluating a major purchase — furniture, electronics, appliances, it also helps to think in terms of per-use cost rather than total price. A $300 vacuum that lasts 10 years costs $30 per year; a $150 vacuum that fails in 2 years costs $75 per year. Seen through that lens, the 50%-off sticker on the cheaper option may not be the better deal.

Types of Discounts Explained

• Percentage off. The most common discount type — a fixed percentage is subtracted from the original price. A 25% discount on a $60 item saves you $15, resulting in a $45 final price. Percentage discounts scale with the price, so they're more valuable on higher-priced items: 25% off a $500 item saves $125, while 25% off a $20 item saves only $5.
• Fixed amount off. A specific dollar (or currency) amount is deducted regardless of the original price — for example, "$20 off any purchase over $100." Fixed discounts are most impactful on lower-priced items: $20 off a $40 item is a 50% saving, while $20 off a $200 item is only 10%. Retailers often use fixed discounts to set a minimum purchase threshold and increase average order value.
• Buy-one-get-one (BOGO). A promotional structure where buying one item entitles you to a second at a discount — often 50% off or completely free. A true BOGO (buy one, get one free) effectively gives you a 50% discount per unit when you need two of the same item. The catch is that you must buy two to unlock the deal, so BOGO is only genuinely valuable when you actually need both items.
• Tiered discounts (spend more, save more). Discount percentages increase as the purchase total rises — for example, 10% off orders over $50, 20% off orders over $100, 30% off orders over $200. Tiered discounts encourage larger basket sizes and are common in wholesale, subscription boxes, and seasonal sales. They reward high-volume buyers but can tempt shoppers into purchasing more than they need to reach the next discount tier.
• Seasonal and clearance sales. End-of-season discounts occur when retailers need to clear inventory before new stock arrives — think winter coats in February or summer furniture in September. Clearance discounts can reach 50–80% off original prices and represent genuine value when the item still meets your needs. The trade-off is timing: clearance items are often limited sizes, colors, or models, and buying off-season means waiting weeks or months before you can actually use the purchase.

Stacked discounts and the math behind them

The stacked discount field lets you apply a second percentage on top of the first, which is not the same as adding them. A 20% discount followed by an extra 10% off gives a 28% effective discount, not 30%. The calculator shows the effective percent as a callout so you can see exactly what the math produces. This matters most at end-of-season sales where a "20% off + extra 10%" banner looks like 30% until you run the numbers. Six preset pills cover the most common discount amounts — 10, 15, 20, 25, 30, 50%, and the Quebec GST+QST toggle still applies on the final discounted price, not the original.

The Quebec tax toggle covers GST at 5% and QST at 9.975% — applied independently to the subtotal, not stacked on each other. What's not in here: province-by-province tax rates for the rest of Canada (the GST & QST calculator handles that), currency conversion, or price history tracking. Stacked discounts apply to the discount percentage inputs only, you can't stack a percentage on top of a fixed dollar amount off in this version.

Types of Discounts and How They're Calculated

• Percentage discount. The most common. Sale price = original price × (1 − discount%). A 30% off $80 item: $80 × 0.70 = $56. The percentage scales with the price, so it rewards larger purchases.
• Fixed dollar discount. "Save $20" — straightforward subtraction. The effective percentage varies by price: $20 off $100 = 20%; $20 off $200 = 10%. Fixed discounts are most impactful on lower-priced items.
• BOGO (Buy One Get One). BOGO-50% means you get the second item at 50% off — the effective discount is 25% off the total (not 50%). BOGO-free means 50% off the total if both items have the same price.
• Stacked discounts. A coupon applied after a sale doesn't give you (sale% + coupon%) off. Example: 20% sale then 10% coupon = 0.80 × 0.90 = 0.72 of original — 28% off, not 30%.
• Clearance math. If an item is already 40% off and goes to an additional 20% off clearance: 0.60 × 0.80 = 0.48 of original = 52% total discount. The discounts compound, not add.
• Related tools: Percentage Calculator, Canadian Tax Calculator, Tip Calculator, and Profit Margin Calculator.

Discount Psychology and Retailer Tactics

• Anchor pricing. Showing the "original" price next to the sale price makes the discount feel significant, even if the original price was inflated. Research by Kahneman and Tversky shows people evaluate gains and losses relative to an anchor — not in absolute terms.
• Charm pricing. $19.99 feels significantly cheaper than $20.00, though the difference is 1 cent. Studies show approximately 60% of US retail prices end in 9.
• Percentage vs dollar framing. For small amounts, "$5 off" feels bigger than "10% off." For large amounts, "20% off" feels bigger than "$200 off." (Which is the same thing on a $1,000 item.) Retailers pick the framing that sounds most impressive.
• Comparison shopping. "Compare at $89" labels on discount store items often reference inflated MSRP, not market price. Check price history (CamelCamelCamel for Amazon, Honey for other retailers) before assuming you're getting a deal.
• Black Friday / Cyber Monday. Studies consistently show most "doorbuster" prices are available at similar levels throughout the year on at least some items. Use price tracking tools to verify whether a deal is genuinely seasonal or simply marketed that way.

Frequently Asked Questions