Unit Price & Best Deal
Compare price per unit across packages to find the cheapest deal
About this calculator
The Unit Price & Best Deal Calculator compares packages by price per unit to reveal the cheapest option. Enter each package's total price and quantity — in any consistent unit — and it computes the per-unit cost of every row, flags the best deal, and reports the spread between the cheapest and most expensive as a percentage. Rows without a positive price and quantity are skipped. Great for grocery comparisons and bulk-buy decisions.
How to use the Unit Price & Best Deal calculator
- Enter your values into the input fields.
- Read the result — it updates instantly as you type.
- Adjust the inputs to compare scenarios.
- Copy the page URL to share the exact calculation.
Common examples
- 12-pack at 3.49 vs 24-pack at 5.29 → 0.2908 vs 0.2204 per unit — 24-pack wins, 31.95% spread
- 500 g at 2.99, 1 kg at 4.49, 2 kg at 7.99 → best 0.0040/g (the 2 kg pack), 49.69% spread
- Same size, different brands: any row with price ≤ 0 or quantity ≤ 0 is skipped as empty
Frequently asked questions
How does the Unit Price & Best Deal calculator work?
Enter your numbers and the calculator applies the standard formula for this everyday task, showing the result and how it was reached. It handles the unit and rounding details so you do not have to.
When would I use the Unit Price & Best Deal calculator?
Whenever this comes up in daily life — planning, shopping, home projects, travel or work — and you want a quick, dependable answer instead of estimating or working it out by hand.
How accurate are the results?
The math runs at full precision internally and only the displayed value is rounded for readability. For real-world use the practical limit is the accuracy of the numbers you enter, not the calculation.
Can I share a specific calculation with someone else?
Yes. Every value you enter updates the URL, so copying the address bar and sharing the link reopens the exact same calculation for whoever clicks it.