Preço por unidade
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The unit price calculator helps compare the actual cost of products with different quantities or sizes. It divides the total price by the number of units or by weight/volume, providing a standardized unit price. Use it to determine whether a larger package is truly more cost-effective or to compare prices between brands with different packaging sizes.
The formula used is: total price divided by the quantity of units or measure (e.g., $5 for 500g = $10/kg). This standardizes comparisons even when products are sold in different sizes. For example, a liter of milk can be compared to an 800ml package using the price per milliliter.
It's ideal for supermarkets, pharmacies, or any purchase involving size variations. Avoid errors by ensuring the measurement units match (e.g., don't directly compare liters with grams). It works best when products have the same purpose, such as two 90g and 120g soaps.
Cautions: 1) Confirm that the product's stated quantity matches the unit used in the calculator (e.g., 1kg vs 1000g). 2) Exclude promotions that mix different types of units. 3) For volume discounts, calculate the unit price before and after the discount.
Frequently asked questions
How do I use the unit price calculator?
Enter the total price and quantity/measure (e.g., $20 and 1000ml). Click calculate to get the unit price (e.g., $0.02 per ml).
What formula does it use?
Divides the total price by the quantity or measure (price ÷ quantity).
When is it useful?
To compare products with different sizes, like 300g and 500g packages, or check if bulk discounts are beneficial.
Can I compare products with different units?
Convert units to the same measure (e.g., 250ml and 1L should both be converted to ml or liters).
What if the product has no countable units?
Use weight/volume measure (e.g., 200g cheese or 1.5L juice) and input as 200 or 1.5 in the quantity field.