# Unit Price Calculator

URL: https://speedycalculator.com/calculators/everyday-life/unit-price/
Last updated: 2026-10-25

> The unit price calculator compares two products by price per unit – per ounce, gram, litre, fluid ounce or item, including multipacks – and shows which is cheaper and how much you save.

## Inputs

- Compare by
- Option A – size of one item (lb, oz, kg, g)
- Option A – volume of one item (L, fl oz, mL, US gal)
- Option A – number of items
- Option A – price
- Option B – size of one item (lb, oz, kg, g)
- Option B – volume of one item (L, fl oz, mL, US gal)
- Option B – number of items
- Option B – price

## Results

- Option A unit price
- Option B unit price
- Better deal
- Saving per unit

## Formula

```
Unit price = price ÷ (quantity × size per item)
Saving = (higher unit price − lower) ÷ higher unit price
```

## Explanation

Bigger packs are not always cheaper, and different pack sizes make comparisons hard. Bringing both prices to the same unit shows the real deal. Many stores print a unit price on the shelf label, but they don't always use the same unit for every brand.

### How to use the Unit Price Calculator

- **Compare by**
- **Option A – size of one item**
- **Option A – volume of one item**
- **Option A – number of items**
- **Option A – price**
- **Option B – size of one item**
- **Option B – volume of one item**
- **Option B – number of items**
- **Option B – price**

Results update as you type, and every field accepts the units shown in its menu.

### How it works

Choose how the products are measured, then enter the size, number of items and price for both options.

### Tips

- Use the figures from your own bills and product labels – prices and appliance ratings vary widely.
- Look at yearly totals: small daily costs add up and make it easier to compare options.
- Round quantities up to whole packs, rolls or bulbs when you shop.
- Re-check the numbers when prices change; most results scale directly with the unit price.

### Common mistakes to avoid

- Confusing watts (power) with watt-hours or kilowatt-hours (energy).
- Comparing prices without bringing them to the same unit first.
- Ignoring one-off costs such as installation, delivery or replacement parts.

### Inputs explained

FieldWhat to enterCompare byChoose one: Weight, Volume, Number of itemsOption A – size of one itemUnits: lb, oz, kg, gOption A – volume of one itemUnits: L, fl oz, mL, US galOption A – number of itemsA numberOption A – priceAmount in your currencyOption B – size of one itemUnits: lb, oz, kg, gOption B – volume of one itemUnits: L, fl oz, mL, US galOption B – number of itemsA numberOption B – priceAmount in your currency

## Worked example

Inputs — Compare by: Weight; Option A – size of one item: 1 lb; Option A – volume of one item: 1 L; Option A – number of items: 1; Option A – price: $4.99; Option B – size of one item: 3 lb; Option B – volume of one item: 2 L; Option B – number of items: 1; Option B – price: $12.99.

Results — Option A unit price = $4.990 per lb / L / item; Option B unit price = $4.330 per lb / L / item; **Better deal = Option B**; Saving per unit = 13.2 %.

## FAQ

**How do I calculate unit price?**
Divide the price by the number of units – $4.99 for 16 oz is $0.31 per oz.

**Is the bigger pack always cheaper?**
No – promotions and smaller "value" packs are often cheaper per unit.

**What if one is in ounces and the other in grams?**
Choose any unit for each item; the calculator converts both to the same unit.

**What formula does the Unit Price Calculator use?**
Unit price = price ÷ (quantity × size per item).