Understanding the Number Behind the Sale
A 20% discount sounds decent. A 50% discount sounds much better. And when something is advertised at 70% off, it can feel almost impossible to pass up.
But the percentage alone doesn’t tell you whether you’re getting a good deal.
To understand what a discount is really worth, you need to know the price the percentage is based on, how much money you’re actually saving, and what the product normally sells for.
Here’s how to look beyond the big percentage on the sale tag.
How Is a Percentage Discount Calculated?
The basic calculation is straightforward.
If a product normally costs $100 and is discounted by 20%, you’re saving $20.
That makes the sale price:
Regular Price: $100
Discount: 20%
Savings: $20
Sale Price: $80
For a $50 product discounted by 30%:
Regular Price: $50
Discount: 30%
Savings: $15
Sale Price: $35
The percentage tells you how much is being deducted from the starting price.
The important question is whether that starting price is a useful comparison.
20% Off Doesn’t Mean the Same Savings on Every Product
Percentage discounts can be misleading when you’re comparing products with very different prices.
Consider these two offers:
Product A: $20 with 50% off = $10 savings
Product B: $500 with 15% off = $75 savings
Product A has the much larger percentage discount, but Product B saves you considerably more money.
Neither is automatically the better deal. It depends on what you’re shopping for and whether the current price represents good value.
This is why both the percentage discount and actual dollar savings are worth considering.
Pay Attention to the Starting Price
A discount percentage has to be calculated from something.
Depending on the retailer and product, that comparison may involve a list price, suggested retail price, previous price, or another reference price.
Suppose you see:
Reference Price: $199.99
Current Price: $99.99
Discount: 50%
That looks fantastic.
But if the product commonly sells for around $109.99, the current $99.99 price is still cheaper—but the practical savings compared with its typical selling price are closer to $10 than $100.
That doesn’t mean the sale is bad. It simply means the large percentage shouldn’t be the only thing you use to judge it.
What Does 10% Off Save You?
A 10% discount means you save $10 for every $100 of the starting price.
Examples:
- $25 becomes $22.50
- $50 becomes $45
- $100 becomes $90
- $500 becomes $450
- $1,000 becomes $900
A 10% discount on an expensive product can represent more actual savings than a much larger percentage discount on an inexpensive item.
What Does 20% Off Save You?
A 20% discount saves $20 for every $100.
Examples:
- $25 becomes $20
- $50 becomes $40
- $100 becomes $80
- $500 becomes $400
- $1,000 becomes $800
On higher-priced purchases, even a 20% discount can represent substantial savings.
What Does 30% Off Save You?
A 30% discount saves $30 for every $100.
Examples:
- $25 becomes $17.50
- $50 becomes $35
- $100 becomes $70
- $500 becomes $350
- $1,000 becomes $700
At this point, the discount may look substantial, but you should still compare the sale price with other retailers and similar products.
What Does 50% Off Save You?
A 50% discount cuts the starting price in half.
Examples:
- $20 becomes $10
- $50 becomes $25
- $100 becomes $50
- $500 becomes $250
- $1,000 becomes $500
A genuine 50% reduction from a product’s normal selling price can be an excellent deal.
But again, check the starting price. 50% off an unusually high reference price isn’t necessarily better than 20% off a competitive price.
How Do Extra Coupons Affect a Discount?
This is where the math gets a little more interesting.
Suppose a $100 product is already 20% off, making the sale price $80.
Now suppose there’s an additional 10% off coupon.
You might expect the total discount to be 30%, but that’s usually not how percentage discounts stack.
The additional 10% is calculated from the discounted $80 price:
Original Price: $100
20% discount: -$20
Sale Price: $80
Additional 10%: -$8
Final Price: $72
Your total savings are $28, which means the effective discount is 28%, not 30%.
Always check the final price rather than simply adding percentage discounts together.
Dollar-Off Coupons Can Be Easier to Evaluate
A dollar discount is usually easier to understand.
If a product is $79.99 and has a $20 coupon, the resulting price is $59.99 before taxes and any applicable shipping charges.
That makes it easier to compare with another retailer selling the same product for $64.99.
The important number is ultimately the amount you’ll actually pay.
Is a Bigger Percentage Always Better?
No.
Imagine you’re choosing between two similar products:
Product A: Regularly $200, now $100 — 50% off
Product B: Regularly $120, now $90 — 25% off
Product A has the larger percentage discount, but Product B still costs $10 less.
Which one is the better deal depends on the products themselves.
If Product A is substantially better, spending another $10 might be worthwhile. If they’re nearly identical, Product B could provide better value despite its smaller advertised discount.
Calculate the Price Before Getting Excited About the Percentage
When you see a large discount, mentally turn it back into dollars.
Ask:
- What is the final price?
- How many dollars am I actually saving?
- What does this product normally sell for?
- Are other retailers selling it for less?
- Is there an additional coupon?
- Am I comparing the same product or model?
- Would I buy this if the discount percentage wasn’t displayed?
Those questions provide much more information than the sale percentage alone.
The Bottom Line
Discount percentages are useful, but they’re only one part of evaluating a deal.
The best offers combine a competitive final price, meaningful savings, the right product, and purchase terms that make sense for you.
A huge percentage displayed next to a product can grab your attention. The final price and actual value should determine whether you buy it.
At AR Deals, we highlight pricing and discount information to make current offers easier to evaluate. You can browse our Electronics, Home & Kitchen, and Tools & Home Improvement deal categories for current offers.
For more help evaluating online deals, read How to Compare Online Prices Before You Buy and How to Tell If an Amazon Deal Is Actually a Good Deal.
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