The unit price comparison calculator finds the best value by calculating cost per standardized unit for up to 4 products. Compare store brand vs name brand, different package sizes, or any products with mixed units (oz, lb, kg, g, ml, L, or count).
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How to Compare Unit Prices
Unit price comparison is the most reliable way to find the best grocery value. Package sizes and presentation can be misleading — the only fair comparison is cost per ounce, gram, or count.
Step 1: Enter each product's details
For each product, enter the name (optional), price, quantity, and unit. For example: Brand A — $3.49, 16 oz. Brand B — $5.99, 32 oz. The calculator converts everything to the same base unit.
Step 2: Review the ranked results
Results are ranked from cheapest to most expensive per unit. The best value is highlighted in green. You can also see how much you'd save compared to the most expensive option.
Mixed units work automatically
You can compare products in different units — a product priced per pound vs per kilogram, or milliliters vs liters. The calculator handles all conversions so you get an apples-to-apples comparison.
FAQ
Is this unit price comparison tool free?
Yes, completely free with no signup required. Compare up to 4 products and find the best value instantly.
How does unit price comparison work?
Unit price comparison divides the total price by the total quantity to get a price per standardized unit. For example, a 32 oz bottle for $4.00 costs $0.125/oz, while a 16 oz bottle for $2.50 costs $0.156/oz — making the larger bottle the better value despite costing more upfront.
Can I compare products with different units?
Yes — the calculator converts all products to the same base unit for comparison. For example, you can compare a product measured in lbs versus one measured in kg, or a product in ml versus one in liters. All conversions happen automatically.
When is the smaller package actually the better deal?
Bigger is not always cheaper per unit. Small packages may be on sale, you might be buying more than you'll use (leading to waste), or quality differences may justify a premium. Always factor in whether you'll actually use the full quantity before expiration.
Should I always buy the lowest unit price?
Not always. Consider: perishability (can you use it all before it expires?), storage space, cash flow (upfront cost matters), and brand quality differences. The lowest unit price is a starting point, not the final answer.