Free shopping calculators
The sticker price is the wrong number to compare. These two calculators turn it into the one that decides the purchase — what the thing costs you per day for as long as you keep it. No sign-up, nothing stored.
Price Per Day Calculator
Find out the true daily cost of owning any product. Compare two products side by side to see which gives you more value for your money.
Try it nowNewProduct Comparison Calculator
Compare 2-4 products by cost per day, month, and year. Factor in ratings with our Value Score to find the best overall deal.
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Why cost per day beats the price tag
A $60 kettle that dies in two years costs you about eight cents a day. A $300 one that lasts ten costs eight cents a day too — and you buy it once instead of five times. Cost per day is the only comparison that survives contact with a real shelf, where the cheap option and the expensive option are almost never the same product with a different sticker.
The price-per-day calculator does that arithmetic for one product, or for two side by side. The product comparison calculator takes up to four and adds a value score, so a slightly worse-rated product that costs half as much per year can win — which, often, it should. Neither asks for an email and neither keeps what you type.
You still need a real price to type in
Both calculators are only as honest as the number you feed them, and the number on the first shop you looked at is rarely the best one. Run the product through the price comparison tool first, or see whether it is already on today's ranked deals. Standing in a shop, the free iPhone app gets you the same answer from a barcode scan, and will keep watching the price for you afterwards.
Want the lifespan figure rather than a guess? Many of our product reviews publish the expected lifespan the verdict was calculated on, and how we test sets out where those numbers come from.