Unit Price Calculator
Compare prices per unit to find the best value. Perfect for grocery shopping when different sizes have different prices.
Enter at least two products to compare unit prices.
How It Works
Unit price is calculated by dividing the total price by the quantity: Price ÷ Quantity = Price per unit. This lets you compare products of different sizes on an equal basis.
Most store shelf labels include unit pricing, but the units aren't always consistent (one product per ounce, another per 100g). This calculator standardizes comparisons so you can find the true best value.
Remember: the lowest unit price isn't always the smartest buy. Consider shelf life, storage space, and whether you'll actually use the larger quantity. Buying bulk only saves money if you use it all.
Frequently Asked Questions
Is bigger always cheaper per unit?
Usually, but not always. Sales and promotions can make smaller sizes cheaper per unit temporarily. Store brands in smaller sizes sometimes beat name brands in bulk. Always calculate—don't assume.
How do I compare different units (oz vs ml)?
Convert to the same unit first. Common conversions: 1 oz = 28.35g, 1 lb = 16 oz, 1 L = 33.8 fl oz, 1 gal = 128 fl oz. Or use our calculator with consistent units for each product category.
Should I always buy the cheapest unit price?
Not necessarily. Consider: Will it expire before you use it? Do you have storage space? Is the quality the same? Will you actually use that much? Sometimes paying slightly more for a right-sized quantity is smarter.
Why do stores use different units on labels?
There's no universal standard for unit pricing. Stores may use per ounce, per 100g, per count, or other units. This can make comparison harder—which is why calculating yourself or using this tool helps.