Unit Price Calculator

Compare two or three products by weight, volume, or count. Find the real cheapest option and avoid the "bigger is better" trap.

⚖️ Product A

Price ($)

Size / Quantity

Unit

⚖️ Product B

Price ($)

Size / Quantity

Unit

⚖️ Product C (Optional)

Price ($)

Size / Quantity

Unit

Best Deal

Product A

You save $1.24 per oz by choosing Product A

💡 How Unit Pricing Works

Retailers use package-size psychology to make deals look better than they are. A "24 oz" bottle at $6.99 seems like a better deal than "16 oz" at $4.99 — but is it? By normalizing every product to a single base unit, you see the true cost per ounce, pound, liter, or piece.

Common Traps to Avoid

Different units: One product lists ounces, another lists pounds. Always convert to the same unit before comparing.
"Family size" illusion: Larger packages often cost more per unit than mid-size ones. Check every time.
Shrinkflation: The package stays the same size but the contents shrink. Our calculator reveals the new per-unit cost instantly.

Real-World Example

You're buying olive oil. Option A is 17 fl oz for $8.49. Option B is 25.5 fl oz for $11.99. Option B looks bigger, but the unit price is $0.50/fl oz vs $0.47/fl oz. Option A is actually cheaper per ounce, saving you $0.51 per equivalent bottle.

❓ Frequently Asked Questions

Can I compare different unit types, like pounds and kilograms?

Yes. The calculator automatically converts all weight units to a common base (ounces) and all volume units to fluid ounces. You cannot mix weight and volume, as that would be comparing apples to oranges.

Why does the calculator say "incompatible units"?

You likely selected a weight unit (e.g., pounds) for one product and a volume unit (e.g., liters) for another. The tool requires all products to be in the same measurement category so the comparison is meaningful.

Does this work for non-grocery items?

Absolutely. Use it for hardware (price per foot of cable), pet supplies (price per pound of dog food), cosmetics (price per ounce of serum), and anything sold by a measurable unit.

Is my data stored anywhere?

No. All calculations happen inside your browser. Nothing is sent to our server or saved to any database.

🔗 Related Tools

Make sure you're also getting the best deal with these calculators:

Bulk vs. Retail Savings Calculator — Factor in membership fees and storage space.
Stacked Discount Calculator — Apply coupons after finding the cheapest base price.
Price Per Serving Calculator — For recipe ingredients and meal prep.