Price per Unit Converter

Compare 2 to 4 products across count, weight, volume, or length units, normalise them to a shared basis, and rank the best-value pack using your shared currency display.

Unit price comparison

Price per unit converter

Compare pack prices across 2 to 4 products and see which option is cheapest on a shared per-unit basis.

The comparison is normalised to 100 g, so different pack sizes can be ranked on the same basis.

Product 1

Best value

Product 2

Product 3

Currency display

Pack prices and comparison values follow your shared currency and locale preferences.

Result

$0.60 per 100 g

Store brand oats is the lowest-cost option after normalising each pack to the same comparison basis.

Best value
Store brand oats
Next best gap
$0.00 per 100 g
RankProductPack priceQuantityPer 100 gVs best
1
Store brand oats Best value
$2.99500 g$0.60—
2
Premium oats
$4.49750 g$0.60+$0.00 / 100 g
3
Bulk oats
$7.491,000 g$0.75+$1.51 / 100 g

Comparison basis

The ranking uses a shared basis of 100 g for every product in the selected family, so 3 filled rows can be compared directly without changing the pack price you entered.

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Unit Price Comparison

Price per unit converter: compare pack value on a like-for-like basis

A price per unit converter helps you compare products that come in different sizes, weights, volumes, or lengths without guessing which pack is better value. Enter each product price and quantity, pick the measurement family, and the calculator normalises every option to the same basis so you can rank the cheapest choice clearly.

How unit price comparison works

The calculator first converts every quantity into the same base unit inside the selected family. Weight products are converted to grams, volume products to millilitres, length products to metres, and count products to individual items. It then scales those base quantities into a comparison basis such as 100 g or 100 mL so the prices can be compared fairly.

Once every product sits on the same basis, unit price is simply pack price divided by the normalised quantity. That lets you compare a 500 g pack with a 750 g pack, or a 12-pack with a 24-pack, without manually reworking each figure.

Unit price = Pack price / Normalised quantity

This gives the comparable price for the chosen basis, such as price per 100 g.

Normalised quantity = Base quantity / Comparison scale

Base units are converted into the comparison basis used in the results table.

Why the cheapest sticker price is not always the best value

A lower shelf price can still be the worse deal when the pack is smaller. Unit price removes that distortion by showing the cost of the same amount of product across every option. This is especially useful for groceries, toiletries, bulk staples, fabrics, cables, and any other products sold in uneven pack sizes.

Best value does not always mean best purchase. A larger pack may have the lowest unit price but still be the wrong choice if it leads to waste, ties up more cash than you want to spend today, or expires before you use it. The calculator is best used as a value-comparison tool, not as a rule that the largest pack should always win.

How to interpret the comparison table

The results table ranks the options from the lowest unit price to the highest. The best-value row shows the cheapest normalised cost, while the “vs best” column shows how much extra each other option costs on the same basis.

That extra-cost column is helpful when the price gap is small. If the premium brand costs only a little more per 100 g, you may decide the quality difference is worth it. If the gap is large, the table makes that trade-off obvious immediately.

Frequently asked questions

What does “price per 100 g” or “price per 100 mL” mean?

It means the calculator has scaled every option to the same comparison amount so the prices can be lined up fairly. If one pack costs $2.00 per 100 g and another costs $2.40 per 100 g, the first is cheaper on a like-for-like basis even if the pack sizes are different.

 When should I compare by count instead of weight or volume?

Use count when each item is the meaningful unit, such as nappies, bulbs, or coffee pods. Use weight, volume, or length when the pack size matters more than the number of pieces.

 Why can a bulk pack still be the wrong choice?

Bulk packs can lower the unit price, but they may still be a poor buy if the product expires, goes stale, or ties up more cash than you want to spend at once. Unit price shows value, not personal suitability.

 Does changing currency affect the ranking?

No. Currency changes only affect how the money values are displayed. Because every product is converted using the same currency, the best-value ranking stays the same.

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