Free Unit Price Calculator
Compare unit prices of two products to find the better deal. Free calculator shows price per unit, savings amount, and savings percentage for smart shopping.
Item A
Item B
Item A — Price per oz
$0.3744
Item B — Price per oz
$0.3032
✓ Better Deal
You Save with Item B
$0.0712 per oz
19.0% cheaper
Compare any two products with the same unit of measurement. Unit prices shown to 4 decimal places for accuracy.
Formula
Unit Price = Total Price / Quantity — Compare unit prices to find the best valueWhy Unit Price Matters for Smart Shopping
Unit price comparison is one of the simplest and most effective ways to save money while shopping. When products come in different sizes, it's nearly impossible to judge which is the better value just by looking at the total price. A $3.99 box of cereal might seem cheaper than a $6.49 box, but if the smaller box contains 12 ounces and the larger one has 24 ounces, the bigger box is actually a better deal per ounce.
Our unit price calculator makes this comparison instant. Enter the price and quantity for two items, and you'll immediately see which offers more value for your money, exactly how much you save per unit, and the percentage difference between the two options.
How to Calculate Unit Price
The formula is straightforward: divide the total price by the total quantity. If a 32 oz bottle of juice costs $4.80, the unit price is $4.80 ÷ 32 = $0.15 per ounce. Compare this to a 16 oz bottle at $2.80 ($0.175 per ounce), and you can see the larger bottle saves you 2.5 cents per ounce — about a 14% savings.
This works with any unit of measurement: price per ounce, per pound, per item, per liter, per sheet, per load — whatever makes sense for the product you're comparing.
Smart Shopping Tips
- Compare store brands vs. name brands — store brands often have a 20-30% lower unit price for comparable quality
- Check sale prices carefully — sometimes a "sale" price on a small size still has a worse unit price than the regular price on a larger size
- Consider multi-packs — individually wrapped items in multi-packs may or may not be cheaper than buying singles
- Watch for shrinkflation — companies sometimes reduce package size while keeping the same price, effectively raising the unit price
- Factor in waste — the cheapest unit price isn't a deal if the product expires before you use it all
When Bigger Isn't Better
While buying in bulk often saves money, there are situations where it doesn't make sense. Perishable items may spoil before you use them. Products you're trying for the first time might not be to your liking. Storage limitations may not accommodate large quantities. And sometimes, sales or coupons make the smaller size genuinely cheaper per unit. Always calculate rather than assume.
Frequently Asked Questions
What is unit price?
Unit price is the cost per single unit of measurement (per ounce, per pound, per item, etc.). It's calculated by dividing the total price by the quantity. Unit price is the most reliable way to compare products of different sizes because it normalizes the cost to the same measurement.
Is the bigger size always the better deal?
Not always! While bulk and larger sizes are often cheaper per unit, this isn't a universal rule. Sales, promotions, and brand pricing can make smaller sizes more economical. Store brands in smaller sizes sometimes beat name brands in larger sizes. Always compare the actual unit price rather than assuming bigger equals cheaper.
Why must both items use the same unit?
To make a valid comparison, both items need to be measured in the same unit. Comparing price per ounce to price per pound wouldn't make sense without conversion. If items use different units, convert one to match the other first (e.g., 1 pound = 16 ounces).
Should I always buy the cheaper unit price?
Unit price is just one factor. Consider shelf life (will you use it all before it expires?), storage space, quality differences, and your actual needs. Buying a 5-pound bag of flour at a better unit price doesn't save money if half of it goes stale before you use it.
Where can I find unit prices in stores?
Many grocery stores display unit prices on shelf tags, usually in small print below the item price. They're required by law in many US states. The format is typically 'price per oz' or 'price per ct.' If your store doesn't show them, use this calculator while shopping!