How to read a price history and when to buy

A "sale" price only means something when you know what the product usually costs. Price history charts show how a product's price has moved over recent weeks, so you can tell a genuine drop from a return to the normal street price — or from a discount against an inflated "was" price. This guide explains how to read a price history chart, the patterns to look for and how HotWhatHow uses price history in its HOT score and deal labels.

Why a "was" price is not enough

Retailers often show a crossed-out "was" price or a recommended retail price (RRP) next to the current price. Those reference prices are set by the retailer or manufacturer and may not reflect what the product has actually sold for recently. A product can sit below its RRP for months, so "40% off RRP" does not necessarily mean today is a good day to buy.

A price history answers a better question: is today's price low compared with what this product has really cost recently?

How to read a price history chart

A typical chart plots the lowest available price for a product over time — for HotWhatHow, the lowest total price including delivery among in-stock offers.

When you look at one, check:

• The typical level. Where does the line spend most of its time? That is the usual street price.
• The low points. How low has the price been, and how often? A product that regularly drops to a certain level may do so again.
• The trend. Older models often drift down over time, especially after a successor launches. New products can stay near launch price for a while.
• Short spikes. A brief jump just before a sale can make the discount look bigger than it is.
• Gaps. A gap usually means no tracked retailer had the product in stock. Stock problems can push prices up temporarily.
• The time window. A short window can hide the bigger picture; a longer one shows seasonal patterns.

Common patterns

Steady price

The line barely moves. Today's price is the usual price; a small reduction may be the best you will see in the short term.

Regular dips

The price drops to a similar low point every few weeks, often around retailer promotions. If you are not in a hurry, waiting for the next dip may save money — but there is no guarantee it will happen.

Gradual decline

The price steps down over months. This is common for technology before and after a new model launches. Compare what the newer model offers against the saving on the older one.

Rise after a drop

A product sold out at a low price and is back at its usual level, or a promotion has ended. Setting a price alert lets you know if it falls again.

When to buy

There is no rule that works for every product, but these points help:

1. Compare today's price with the product's own recent average, not just with its RRP.
2. Check the total price, including delivery. A low item price with expensive delivery may not be the cheapest overall.
3. Consider timing: big retail events, end-of-season sales and new model launches often move prices, but not always downwards for every product.
4. Do not wait for a perfect price if you need the item now. A modest saving is rarely worth weeks without a product you rely on.
5. Set an alert for the price you are willing to pay.

How HotWhatHow uses price history

When retailers are connected, HotWhatHow records the lowest in-stock total price for each product, per storefront, once a day. We use that history in three ways:

• Price history charts on product pages show how the lowest total price has moved over time.
• The HOT score (0–100) rewards real drops: it looks at how far today's price is below the product's own 90-day average, how far below RRP it is, how recently the price fell (only while it is still low) and how many retailers have it in stock. A price above its usual level never earns drop points.
• Verified price drops appear only once a product is cheaper than its own 90-day average and we hold at least two weeks of its price history behind the claim.

Some retailers' terms do not allow their prices to be stored as history. Where that applies, those prices are shown live but are not included in the chart. You can read the full method on our How we score page.

Key specs explained

Questions to ask before you buy

1. Is today's price below the product's own recent average, or just below its RRP?
2. How long is the price history, and does it cover past sales events?
3. Is the low price from an in-stock offer with known delivery costs?
4. Is a newer model due, and would I prefer it?
5. How much would I really save by waiting, and can I wait?

Frequently asked questions

What is a genuine price drop?

A price that is lower than what the product has actually cost recently — for example, below its own 90-day average — rather than a discount against a recommended or "was" price.

Does price history predict future prices?

No. It shows what has happened, which helps you judge today's price. Prices can rise or fall for many reasons, so use patterns as a guide, not a forecast.

Why is there a gap in the chart?

Usually because none of the tracked retailers had the product in stock, or because we only started tracking it recently.

Why do some retailers' prices not appear in the history?

Some networks and retailers do not allow their prices to be stored. We show those offers live when we can, but leave them out of the history chart.

Prices & links

HotWhatHow compares live prices from retailers as they are connected to the site, and price history builds up from the day a product is first tracked. Some retailer links are affiliate links; we may earn a commission, which never changes which offer we label as the cheapest or how we calculate a price drop.