Product Comparison Calculator
Compare up to 4 products by true cost of ownership. Add ratings to calculate a Value Score that reveals the best overall deal — not just the cheapest option.
Product 1
Product 2
Haven't priced the candidates yet? Price-check each one across the stores we can reach — the comparison is only as good as the numbers you feed it.
Value math is only as fresh as the prices you typed in.
This calculator ranks candidates from the prices you enter, then forgets when the tab closes. The free iPhone app watches a saved product in the background and alerts you when its price drops — so the number you feed the calculator next time is still current.
Free on the App Store · iPhone, iOS 17 or later
How the Product Comparison Calculator Works
Choosing between products is rarely just about the sticker price. A $1,200 laptop that lasts 6 years costs $0.55/day, while a $800 laptop that lasts 3 years costs $0.73/day. The “cheaper” option is actually 33% more expensive to own.
This calculator breaks down the true cost of ownership across daily, monthly, and yearly periods — then highlights the winner so you can make a confident decision.
What Is the Value Score?
Price isn't everything — quality matters too. Our Value Score combines cost efficiency with product quality by dividing the rating by the daily cost:
Value Score = Rating ÷ Daily Cost
A higher Value Score means you get more quality per dollar spent
For example, a product rated 4.5 stars that costs $0.50/day has a Value Score of 9.0. A 3.5-star product costing $0.30/day scores 11.7— it's actually a better value despite the lower rating.
When to Use This Calculator
- Comparing similar products — see which robot vacuum, laptop, or headphone gives you the most value over time
- Premium vs. budget decisions — sometimes paying more upfront saves money in the long run
- Factoring in quality — use the Value Score to see if paying for better reviews is worth the extra cost
- Presenting options to others — show family or colleagues a clear, visual breakdown
The Math Behind It
Daily Cost = Purchase Price ÷ (Years × 365)
Monthly Cost = Daily Cost × 30.44
Yearly Cost = Purchase Price ÷ Years
Value Score = Rating ÷ Daily Cost
Want a simpler single-product calculation? Try our Price Per Day Calculator. Still deciding which candidates belong in the comparison at all? Our product reviews name who each one is wrong for, which usually removes a row before you have to price it.