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Price Per Unit Calculator

Which pack is actually cheaper, per unit.

Business Calculators Free, no sign-up Runs in your browser

Name, price, size. Size in the base unit: grams, millilitres, items or metres.

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Cheapest
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Its unit price
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Most expensive per unit
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Saving against the worst
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Spread
OptionPriceSizePrice per unitAgainst the cheapest

About the Price Per Unit Calculator

Price Per Unit Calculator compares several pack sizes and tells you which is actually cheaper per unit. Shops are not obliged to make this easy, and the larger pack is not always the better value -- a fact the comparison makes visible in a second rather than in the aisle with a phone calculator.

Everything is reduced to one basis of your choosing: per kilogram, per hundred grams, per litre, per hundred millilitres, per item or per metre. Enter the sizes in the base unit -- grams rather than kilograms, millilitres rather than litres -- and the conversion to the comparison basis is done for you.

The saving is shown against the most expensive option as well as the cheapest, because that is the figure that tells you whether the decision matters. A two per cent spread across three pack sizes is not worth a trip; a forty per cent spread is, and both occur regularly on the same shelf.

This is arithmetic, not financial advice. It tells you what the numbers do; it cannot tell you whether a decision is right for your circumstances. Fees, taxes and local rules vary, so check anything that matters against the actual offer and speak to someone qualified before committing.

Everything is worked out inside your browser. Nothing you enter is uploaded, logged or stored, which matters for the financial calculators in particular: the figures you put into them are nobody else's business.

How to use the Price Per Unit Calculator

  1. Choose compare perThe fields below change to match what you pick, so only the figures that matter to your case are asked for.
  2. Enter the options, one per lineDecimals are fine, and thousands separators are accepted and ignored.
  3. Read the cheapest, its unit price and most expensive per unitThe figures update as you type. The Calculate button is there if you would rather press something, but nothing waits for it.
  4. Copy or check the resultCopy the summary with the copy button, or open the table to check it row by row.

Features

  • Shows cheapest, its unit price, most expensive per unit, saving against the worst and spread together, so you are not running it twice
  • A results table you can read across
  • Updates as you type, with no button to press and no page reload
  • Copy the result in one click
  • Free, no sign-up, and it runs entirely in your browser

Who uses this tool

The price per unit calculator is used by writers, developers, students, marketers and anyone else who needs the job done once without installing software. Common cases include:

  • Comparing supermarket pack sizes
  • Checking whether a bulk deal is really cheaper
  • Comparing suppliers quoting different quantities
  • Working out the unit cost in a quote or tender

Frequently asked questions

What size should I enter?

The size in the base unit: grams, millilitres, items or metres. A 1.5 kg pack is 1500, and a 2 litre bottle is 2000.

Does it handle multipacks?

Yes. Enter the total contents, so a six-pack of 330 ml cans is 1980, or compare per item by entering 6 and choosing per item.

Why is the bigger pack sometimes worse value?

Because pricing follows what people will pay, not arithmetic. Large packs are often promoted as value and priced above the small-pack unit rate.

If the price per unit calculator is not quite what you need, these other free tools solve closely related problems, and there are 19 more in business calculators.

Discount Calculator

Enter a price and a discount to get the saving, the final price and tax.

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GST Calculator

Add or remove GST at any rate, with the tax split.

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Markup Calculator

Markup, margin and selling price, and the difference between the first two.

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Unit Converter

Convert between metric and imperial units across seven categories.

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Checked and rebuilt on 2026-10-14. The method this calculator uses is described in the section above, and corrections go through the contact page.