Option A
Option B 🏆 Best Deal
- 1Enter the total Price ($) and Quantity / Weight for Option A.
- 2Enter the total Price ($) and Quantity / Weight for Option B.
- 3View the exact cost per single unit for both options and see which package offers the best value.
Unit price calculates the cost per single unit of measurement (such as per ounce, gram, pound, or liter). Comparing unit prices allows buyers to evaluate true economic value across differently sized packages.
Divide total package price by quantity or weight.
Unit Price = Total Price / Quantity | Example: $4.99 / 16 oz = $0.3119 / ozThe two unit prices are treated as equal when they differ by less than 0.000001; otherwise the lower one wins.
If |unit price A − unit price B| < 1e-6 → TIEUnit A = $4.99 / 16 = $0.3119/oz | Unit B = $7.49 / 28 = $0.2675/ozA = 4.99 / 16 ≈ $0.3119/oz; B = 7.49 / 28 ≈ $0.2675/ozA = 3.00 / 2 = $1.50/L; B = 4.20 / 3 = $1.40/L- Same Measurement Unit: Ensure both packages are measured in the same unit (e.g. ounces to ounces) for a valid mathematical comparison.
- Beyond Unit Price: While lower unit price indicates better value per unit, factors such as total budget, storage space, and item expiration should also be considered.
- Prices may be 0 or more, but each quantity must be greater than 0 — dividing by a zero quantity is undefined and returns no result.
What is a unit price?
A unit price is the cost of a single unit of weight or volume (e.g. per ounce or per gram), allowing direct price comparison across different package sizes.
Is the larger bulk package always the cheaper unit price?
Not always. While bulk items often offer lower unit costs, sales or promotions can sometimes make smaller packages more economical.
Do both quantities have to use the same unit?
Yes, for the comparison to be meaningful. The calculator just divides price by quantity for each option; if one is in ounces and the other in grams, the unit prices are not comparable.
What does a TIE result mean?
The two unit prices are effectively identical (within one millionth), so neither option is cheaper per unit.