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Free Unit Price Comparator

A free unit price comparator works out the price per standard unit (per kg, per liter, or per item) for two or more products so you can spot the better deal. Enter each product's price and quantity with its unit, and the tool converts everything to a common base, ranks them, and flags the cheapest with a 🏆 Best Deal badge — no signup, runs in your browser.

Two sizes, two prices, two units — which is actually cheaper? Enter each product's price and quantity (grams, kg, oz, lb, mL, liters, fl oz, gallons, or pieces) and the comparator converts everything to a single base unit before calculating the price per kg, per liter, or per item. It highlights the best value with a 🏆 Best Deal badge and shows how much more the others cost. Add as many products as you like for multi-pack or multi-store comparisons. Free, no signup, all math runs locally in your browser.

What are you measuring?

Enter a price and quantity to compare.

Enter a price and quantity to compare.

Fill in the price and quantity for at least two products to see which one offers the best value.

Runs 100% in your browser. Your data never leaves your device.

Built with plain JavaScript arithmetic and unit-conversion factors — each quantity is converted to a common base unit (grams, milliliters, or pieces) before dividing price by quantity. All comparison runs locally in your browser with no external libraries or server calls.

How to Use Unit Price Comparator

  1. Choose what you are measuring — weight, volume, or count/pieces
  2. Enter each product's price, quantity, and its unit (e.g. 500 g vs 1 kg)
  3. The tool converts to a common unit and shows the price per kg, liter, or item
  4. The cheapest option is highlighted with a 🏆 Best Deal badge
  5. Click Add another product to compare multi-packs or multiple stores

When Would You Use This?

Grocery shoppers staring at a 500 g jar and a 1 kg jar at different prices use this to see the real price per kilogram instead of guessing which is cheaper.

Bulk buyers weighing a single can against a 12-pack convert both to price per item or per liter to confirm the multi-pack actually saves money — sometimes it does not.

Anyone comparing the same product across two stores in different units (ounces vs grams, fluid ounces vs milliliters) gets an apples-to-apples unit price without doing the conversion math by hand.

Frequently Asked Questions

Is this unit price comparator free to use?
Yes, completely free. No signup, no login, no payment ever.
Do I need to create an account?
No account needed. Open the tool, enter your products, and compare immediately.
Is my data safe?
Everything runs in your browser. Nothing is uploaded to our servers. We cannot see your prices.
Can I compare different units like 500 g and 1 kg?
Yes. As long as the products are in the same category (weight, volume, or count), the tool converts everything to a common base unit before calculating, so you can compare grams against kilograms or milliliters against liters correctly.
Can I compare more than two products?
Yes. Click Add another product to add as many options as you want — useful for multi-pack deals or comparing the same item across several stores.
How does it decide the best deal?
It converts each product to a price per standard unit (per kg, per liter, or per item) and flags the lowest one with a 🏆 Best Deal badge. The others show how much more expensive they are by percentage.

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