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FINANCE & BUDGETING

Unit Price Comparator

Check which package, bottle, bag, or subscription option is cheaper by comparing price divided by quantity with a clear best-value result.

Tool statusRuns in your browser
Preview

Item A

Item B

Results

Best value
Family pack
Difference
17.6%
NameUnit priceDifference
Small pack$0.01 / g17.6%
Family pack$0.0085 / g0%

How it works

  1. Enter your input

    Fill in the values, paste your text, or upload the file this tool works with.

  2. See results instantly

    Most tools update live as you type; a few use a single button. Either way, the result appears right on this page.

  3. Use your results

    Copy, download, or share what the tool produces — you're always in control of the output.

Privacy and processing — Runs locally in your browser. This tool does not upload your input.

What is Unit Price Comparator?

A unit price comparator divides each product's price by its quantity so you can compare the true cost per gram, liter, or unit across different package sizes, instead of comparing sticker prices alone.

UNDERSTAND THE TOOL

How to compare unit prices

Use the comparator when two package sizes or product options make the cheaper choice hard to see at a glance — different pack sizes, weights, or unit labels hide which one is actually the better deal.

How the comparison works

Unit price
price / quantity
Difference from the best price
(unitPrice - best) / best * 100

$3.00 for 500 g vs. $5.00 for 1 kg

The 1 kg option is cheaper per gram, at $0.005/g vs. $0.006/g — the smaller pack costs 20% more per unit.

3.00 / 500 = 0.006; 5.00 / 1000 = 0.005; (0.006 - 0.005) / 0.005 * 100 = 20%

Comparing like with like

  • Convert every option to the same unit before comparing — grams with grams, milliliters with milliliters, not grams with ounces.
  • Include only what you'll actually pay: taxes, shipping, or coupons should be folded into the price you enter if you want them reflected.

Common unit label mix-ups

  • "oz" (weight) vs. "fl oz" (volume) — they measure different things and aren't interchangeable.
  • A larger package isn't automatically cheaper per unit — bulk pricing varies a lot by brand and by store.

What the comparison leaves out

The result only reflects the price and quantity you typed in — it doesn't know about quality, ingredients, or whether a larger pack will go stale before you finish it.

Frequently Asked Questions

Can I compare grams and kilograms directly?

Convert them to the same unit first — enter both quantities in grams, or both in kilograms, so the comparison means the same thing.

What does the difference percent mean?

It shows how much more expensive an option is per unit compared with the cheapest one in the list.

Does this include shipping or coupons?

Only if you fold those adjustments into the price you enter for that option.

How many products can I compare at once?

Add as many options as you're weighing — the tool highlights the single best unit price among them.

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