Melhor preço unitário (A vs B)
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
This calculator compares two products by unit price to find the most economical option. Input the price and quantity of each item, and it calculates the cost per unit of measure. It's ideal for daily purchasing decisions, such as choosing between rice packages, detergent bottles, or canned goods.
The calculation uses the formula: price divided by quantity (e.g., $10 for 2kg = $5/kg). After entering the data, the system displays each product's unit price, highlighting the cheaper option. This eliminates manual calculations and reduces errors in quick comparisons.
Use this tool when deciding between differently sized packages. For example, a larger package might have a lower unit price but require more storage space. The result here considers only mathematical value, not quality or personal preference.
Cautions: This tool does not replace sensory analysis (e.g., freshness of food) or additional costs (e.g., shelf life or transportation). Always verify the units of measure (kg, ml, units) and avoid comparing products with vastly different compositions.
Frequently asked questions
How does the calculator determine unit price?
It divides the total price by the product quantity, showing the cost per unit (kg, ml, piece). Example: $15 for 300g = $0.05/g.
Can I use different measurement units?
Yes, but keep the same units for both products. Convert them beforehand (e.g., kg to g) if needed.
Why doesn't it include extra costs?
It focuses only on mathematical comparison. Factors like shelf life, transport, or quality should be evaluated separately.
Can I compare more than two products?
Not currently. Use the tool twice to compare three or more options in pairs.
What if unit prices are equal?
Both products have the same cost per unit. Consider other factors like packaging, brand, or ease of use.