How to tell if an online deal is actually a good price

Compare the offer, not just the percentage

A useful way to judge an online deal is to compare the exact item with realistic alternatives, calculate what you would actually pay, and decide whether you wanted it before seeing the discount. A large percentage reduction can be interesting, but it does not answer those questions. The cheapest suitable option might have no sale badge at all.

Our suggested checklist separates three decisions: whether the product suits you, whether the offer is competitive, and whether the seller's terms are acceptable. A bargain has to survive all three. This guide explains that process with hypothetical examples rather than a list of offers that could expire before you reach the checkout.

Match the exact model and what comes in the box

Start with the full model number, capacity, size, colour and condition, not just the product family. The US Federal Trade Commission recommends recording manufacturer or model details when comparison shopping and reading descriptions carefully, including condition labels. That helps you avoid treating two different configurations as the same offer. FTC: Online Shopping.

For example, imagine two listings for a similarly named cordless tool. One includes a battery and charger; the other is the tool alone. The lower headline price is not a like-for-like comparison if you need both accessories. Our practical suggestion is to write one short specification line and use it for every search. Mark any difference explicitly rather than mentally rounding it away because the product photo looks familiar.

Ask what the advertised saving is measured against

A crossed-out price is a reference point, not a complete history. In its own research and guidance, UK consumer organisation Which? advises comparing prices across sellers, checking price history and looking beyond recommended retail prices. Its investigations show why a prominent previous price may not describe the most recent price shoppers could have paid. Which?: How to avoid fake Black Friday deals.

Consider an invented example in a single currency: an item is advertised at 120 instead of 200, a reduction of 40%. If comparable sellers currently charge 125, the difference from that available alternative is only 5, or 4% of 125. Both calculations can be arithmetically correct, but they answer different questions. The first describes the advertised reference; the second helps with your purchase decision today.

Use price history as context, not a prediction

A historical chart can help show whether the current price is unusual. Which? points readers toward price-history tools as part of checking a sale. Before relying on a chart, check what product and market it covers, and compare the tracked listing with the one you can actually buy. A history for another variant is not evidence about your basket. Which?: How to avoid fake Black Friday deals.

Our recommendation is to ask three questions of the record: How long is the observation period? Does the lower price recur, or appear only briefly? Can you establish what was included at that price? Treat an unexplained gap as missing information, not proof that nothing changed. A past low also cannot tell you when it will return. If you need the item now, compare today's acceptable options instead of assuming waiting must produce a better result.

Compare the checkout total on the same basis

The FTC recommends comparing the full cost, including delivery, taxes and other charges, and checking whether a promotion requires unwanted purchases. A listing price is only the starting point. Use the same delivery destination and a suitable delivery option for each comparison, and check whether tax is already included before adding anything yourself. FTC: Online Shopping.

Here is another hypothetical comparison, with tax already included in both prices. Seller A asks 79 plus 12 for delivery, making 91. Seller B asks 86 with delivery included, making 86. Seller B is cheaper by 5 despite its higher item price. If a coupon reduces A's item price to 69, its total becomes 81, not 69, and A now costs less. Always redo the sum after the actual coupon result appears.

For a membership-only offer, write down any additional membership payment separately. For a bundle, list what you would otherwise purchase rather than assigning full value to every included extra. Our conservative approach is not to subtract an uncertain future reward from the amount due today. You can record it as a possible benefit while making sure the purchase still makes sense without it.

For multipacks, compare a common unit

Unit pricing expresses cost against a standard measure, such as weight, volume or number of items. Australia's competition regulator, the ACCC, explains how this helps compare similar grocery products. The arithmetic is useful beyond one country, although rules about which shops must display unit prices are local and should not be assumed to apply everywhere. ACCC: Unit pricing.

Suppose a pack of 12 identical items costs 9 and a pack of 20 costs 16, in the same currency. The smaller pack costs 0.75 per item; the larger costs 0.80. Bigger is not cheaper in this example. Even when the larger pack wins on unit price, ask whether you can use or store the extra quantity. A lower unit cost and a lower total purchase cost are different advantages.

Check the seller and the cost of changing your mind

On a marketplace, examine the individual seller as well as the platform. The FTC advises checking seller contact details, descriptions, shipping terms and return policies, and keeping written answers to questions. It also warns against requests to move payment outside the marketplace's system. A familiar marketplace name is not a substitute for examining the particular offer. FTC: Buying From an Online Marketplace.

Before ordering, find out where a return would go, who would pay for it and whether the listed condition matches what you expect. Check relevant warranty terms rather than assuming every similarly named product has identical coverage. For cross-border purchases, resolve unclear delivery charges or return arrangements first. Local consumer rights may provide protections beyond store policies; use guidance for your own jurisdiction when a legal question matters.

Treat ratings and countdowns as claims to inspect

The FTC's review guidance recommends consulting different sources and considering the reviewer and publication. It cautions that fake reviews can be positive or negative, and that appearance alone cannot reliably separate genuine feedback from manipulation. Look for information relevant to the exact item and your intended use, rather than letting a star average decide whether the discount is valuable. FTC: How To Evaluate Online Reviews.

The UK's Competition and Markets Authority warns about misleading countdown timers and false stock claims in its shopping advice. It also recommends checking AI-generated shopping suggestions against retailers' own pages. A timer does not establish good value, and an AI summary does not establish the checkout price. Neither means you should skip the comparison you planned to make. CMA: Shop smart, bag a bargain.

Finish with a decision you can explain in one sentence

Our final test is simple: could you explain the purchase without mentioning the sale badge? For example, you need this exact configuration, its delivered cost is competitive, and the seller offers terms you understand. That is a more useful reason than the fear that a promotional clock might run out. You do not need to find the lowest price ever recorded to make a reasonable choice.

If an important detail remains unclear, pause and ask rather than filling the gap with optimism. If the product was never on your list, consider leaving it there while you decide whether it solves a real need. A good deal is not merely a discount you can calculate. It is an offer whose price, product and practical conditions make sense together for you.