Cost Per Unit Calculator
Compare two package sizes by price per unit to see which is actually the better deal. This free online other calculator runs entirely in your browser — no signup, no data sent anywhere.
Inputs
Results
How It Works (Formula & Method)
Unit price is simply price divided by quantity. The calculator computes it for both items and compares them: the lower unit price is the better value. The savings figure shows how much cheaper the winner is per unit, as a percentage of the more expensive option.
Use the same unit of measure for both quantities — ounces vs ounces, sheets vs sheets, millilitres vs millilitres — so the comparison is apples to apples.
Worked Example
Below is a worked example using the calculator's default values. The same numbers are pre-filled in the form above so you can press Calculate and see the result without typing anything.
Inputs used:
- Item A — Price ($): 4.5
- Item A — Quantity/Size: 12
- Item B — Price ($): 7.2
- Item B — Quantity/Size: 20
With these inputs, the calculator computes the metrics shown in the Results panel. Change any value and press Calculate again to see how the result responds — the live widget and the chart both update instantly.
Tips & Considerations
The bigger package is not always cheaper per unit — "bulk" pricing sometimes carries a premium. Watch for different units on shelf tags (per 100 g vs per kg) and factor in whether you will actually use a large quantity before it expires.
Frequently Asked Questions
How do I calculate price per unit?
Divide the total price by the number of units (or the size) in the package. For example, $4.50 for 12 items is $0.375 per item. Comparing this figure across products reveals the true best value.
Is the larger size always cheaper per unit?
Usually, but not always. Retailers occasionally price larger packages at a higher unit cost, and promotions on smaller sizes can flip the math. Always compare the actual per-unit prices rather than assuming.
What does the Cost Per Unit Calculator compute?
The Cost Per Unit Calculator takes 4 input values and returns 4 results. Compare two products by their true price per unit to see which is the better deal and by what percentage, no matter how different the package sizes are.
Is my data sent to a server?
No. The Cost Per Unit Calculator runs entirely in your browser using static JavaScript. Your inputs are never transmitted to CalculatorHive or any third party, and nothing is stored after you close the page.