Unit Price Calculator
Compare product prices per kg, liter, ounce, or piece to find the true best value at the supermarket. Mixed package sizes and units supported, works offline.
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What is Unit Price Calculator?
Unit Price Calculator is a free online tool that compares the real cost of products sold in different package sizes. Enter each product's price, quantity, and unit, and the calculator normalizes everything to price per kg, per liter, or per piece, crowning the cheapest option and showing how many percent more expensive every alternative is.
Key Benefits
- Never overpay for a misleading "value pack" again
- Compare mixed units — grams vs ounces, ml vs liters — fairly and automatically
- See the percent penalty of every option at a glance
- Copy a clean summary to your shopping list
- Works offline with no account and no data collection
Common Use Cases
- •Deciding between the 5 kg and 2.5 kg rice bags at the supermarket
- •Checking whether the multipack or the single bottle of milk is cheaper
- •Bulk-buying decisions for restaurants, cafes, and small shops
- •Comparing laundry detergent or pet food across brands and sizes
- •Teaching kids practical division and consumer math
How to Use Unit Price Calculator
- Enter product details: For each product, type an optional name, the package price, the quantity, and pick the unit — for example 189 for 5 kg of rice.
- Add more products: Click "Add product" for each alternative. Use any unit in the same group — grams, ounces, or kilograms are converted automatically.
- Read the comparison table: Each product shows its price per kg, liter, or piece. The cheapest option gets a trophy badge and green highlight instantly.
- Copy or reset: Use "Copy results" to save the summary for your shopping list, or "Clear all" to start a fresh comparison.
Key Features
- Unlimited product rows with live per-kg, per-liter, and per-piece price calculation as you type
- 12 units across weight (mg, g, kg, oz, lb), volume (ml, L, fl oz, cup, gallon), and count (piece, dozen)
- Automatic unit conversion to a common base per group, so 710 ml vs 1 L compares fairly
- Best value trophy highlighting with a percent-more-expensive column for every alternative
- One-click example data, copy-to-clipboard summary, and clear-all reset
- 100% client-side and offline — no account, no uploads, data never leaves your device
Frequently Asked Questions
What is a unit price?
The unit price is the cost of a product per standard amount — per kilogram, per liter, or per piece. Two packages with very different sizes can only be compared fairly by dividing the price by the quantity, which is exactly what this calculator does automatically.
Why is the bigger pack sometimes more expensive?
Packaging, marketing, and promotion costs vary between sizes, and stores know shoppers assume bigger means cheaper. Studies repeatedly show the larger pack is not always the best value — the percent-difference column in the results makes the penalty obvious.
Can I compare grams with ounces, or milliliters with gallons?
Yes. All weight units (mg, g, kg, oz, lb) are converted to kilograms, volume units (ml, L, fl oz, cup, gallon) to liters, and count units (piece, dozen) to pieces, so any mixture inside a group compares correctly.
Why can't I compare rice with milk?
Comparing price per kg of rice against price per liter of milk is meaningless, so products are grouped by weight, volume, and count automatically, and each group shows its own best value.