Unit Price Calculator

Written byOleh Soloninupdated 27 September 2026

Currency

What to work out

Product A: pack price

Product A: quantity in the pack

Product A: unit

Result

Price per unit

$10.00

Price per kg

$10.00

Price per 100 g

$1.00

Price per lb

$4.54

Price per oz

$0.28

Working

5.00 ÷ 0.5 kg = 10.00 per kg

This result is informational only and is not professional advice.

Price per kilogram, litre or item, and the calculations in reverse

Work out the price per kg, 100 g, litre, 100 ml or item from a pack price, see which of two packs is better value even in different units, what a set amount costs at a price per kg, and how much a sum buys, with the working for each.

Packs of the same product come in different sizes, so the shelf price alone does not show which is cheaper. The calculator turns a pack price into a price per kg and 100 g, per litre and 100 ml, or per item, and compares two packs even when one is in kilograms and the other in grams.

It also works backwards: what 350 g costs at a price per kilogram, and how many grams a set sum buys. Every mode shows its Working line.

How to use

Choose the task: price per unit, compare two products, cost of an amount, or how much a sum buys.
Enter the pack price, the quantity and the unit: kg, g, l, ml or items.
To compare, enter the second pack and choose the basis: per 100 g, per 100 ml or per unit.
For the reverse calculations, enter the price and what it is for, then the amount you need or the sum you have.

How to work out a unit price

Unit price = pack price ÷ quantity. With the weight in kilograms you get the price per kg: 5.00 for 0.5 kg is 5.00 ÷ 0.5 = 10.00 per kg, or 1.00 per 100 g. With the weight in grams, multiply by 1,000 for a kilogram or by 100 for 100 g: 3.80 for 400 g is 9.50 per kg and 0.95 per 100 g.

Pounds and ounces work too, using 1 lb = 453.59237 g and 1 oz = 28.349523125 g: 4.99 for a 16 oz pack is 0.31 per ounce, 4.99 per pound and 11.00 per kilogram.

Worked out with this calculator.
To find	Formula	Example
Price per kg, weight in kg	price ÷ weight	5.00 ÷ 0.5 = 10.00
Price per kg, weight in g	price ÷ weight × 1,000	3.80 ÷ 400 × 1,000 = 9.50
Price per 100 g	price ÷ weight in g × 100	3.80 ÷ 400 × 100 = 0.95
Price per litre	price ÷ volume in l	1.89 ÷ 0.9 = 2.10
Price per 100 ml	price ÷ volume in ml × 100	1.89 ÷ 900 × 100 = 0.21
Price per item	price ÷ number of items	2.40 ÷ 10 = 0.24

Which pack is better value

To compare two packs, bring both to the same basis. 5.00 for 0.5 kg is 1.00 per 100 g; 3.80 for 400 g is 0.95 per 100 g. The second pack is 5% cheaper, and the same 500 g at its price would cost 0.25 less.

Only compare like with like: weight with weight, volume with volume, items with items. Grams and millilitres are not the same thing for different products, so the calculator does not mix them.

What a set amount costs

When the label shows a price per kilogram and you need less, multiply by the fraction of a kilogram: 350 g at 10.00 per kg is 10.00 × 0.35 = 3.50. In the cost of an amount mode the price can be per kg, per 100 g, per litre, per 100 ml or per item.

Cost of the weight you need. Worked out with this calculator.
Price per kg	100 g	250 g	350 g	500 g
6.00	0.60	1.50	2.10	3.00
10.00	1.00	2.50	3.50	5.00
16.00	1.60	4.00	5.60	8.00
24.00	2.40	6.00	8.40	12.00

How much a sum buys

The reverse question is how much you get for a set sum: sum ÷ price per kg. 7.50 at 10.00 per kg buys 0.75 kg, or 750 g. For items sold individually, the calculator rounds down to whole items.

What this calculator shows

The price per kg and 100 g, per litre and 100 ml, or per item
Which of two packs is better value, by what percentage and by how much
What the amount you need costs at a price per kg or litre
How many grams, millilitres or items a sum buys
The working with your numbers

What to keep in mind

Only quantities of the same kind are compared: weight with weight, volume with volume, items with items.
Prices are rounded to cents only for display.
Loyalty discounts and multi-buy offers are not included; the discount calculator handles those.

FAQs

How do I calculate unit price?

Divide the pack price by the quantity: 5.00 for 0.5 kg is 10.00 per kilogram. If the weight is in grams, multiply by 1,000 for the price per kg or by 100 for the price per 100 g.

How do I work out the price per ounce?

Divide the pack price by the number of ounces: 4.99 for 16 oz is 0.31 per ounce. For a price per pound, multiply the price per ounce by 16, or choose lb as the unit.

How do I work out the price per kg from grams?

Price ÷ weight in grams × 1,000. 3.80 for 400 g is 3.80 ÷ 400 × 1,000 = 9.50 per kilogram.

How do I tell which pack is cheaper?

Bring both to the same basis, such as per 100 g, and compare. 1.00 against 0.95 per 100 g means the second is 5% cheaper. Use the compare mode.

What does 350 g cost if a kilogram is 10.00?

10.00 × 0.35 = 3.50. In the cost of an amount mode the price can be given per kg, per 100 g, per litre, per 100 ml or per item.

How many grams does 7.50 buy at 10.00 per kg?

Divide the sum by the price per kilogram: 7.50 ÷ 10.00 = 0.75 kg, or 750 g.

Is the bigger pack always better value?

Not necessarily; only the unit price shows it, and the saving only counts if you use the whole pack.

Worked example

Two packs of cheese

Input: 5.00 for 0.5 kg and 3.80 for 400 g

Output: 1.00 and 0.95 per 100 g; the second is 5% cheaper

Note: Half a kilo at the second pack's price would cost 4.75, which is 0.25 less.

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