Conversor de Libras e Onças

Converte libras + onças em kg.
Created by
Renato Passos, Eng. de Software
Reviewed by
Renato Passos, Eng. de Software

Last updated: Apr 18, 2026

kg
4,763

Formula

kg = (lb × 16 + oz) × 0,02835

About this calculator

The Pounds and Ounces Converter is a practical tool for converting imperial measurements (pounds and ounces) to kilograms, the standard unit of the metric system. It is useful for those dealing with international cooking recipes, luggage weights during travel, or imported product specifications. The conversion works by summing the pounds (multiplied by 16) with the ounces, then multiplying the total ounces by 0.02835 to obtain the weight in kilograms.

The calculator works simply: the user enters the number of pounds and ounces separately. Internally, the system converts pounds to ounces (multiplying by 16) and adds the given ounces. The total ounces are then multiplied by the conversion factor 0.02835, resulting in the equivalent weight in kilograms. The result is displayed with up to two decimal places, ensuring accuracy for most everyday uses.

This converter is especially useful in situations like adapting American or British cooking recipes, which often use pounds and ounces for ingredients. It is also helpful for checking luggage weight during international travel, where many countries use the metric system. Additionally, it can assist professionals dealing with imports of products such as supplements or equipment that have weight specified in pounds and ounces.

When using the converter, keep in mind that the conversion is approximate, as the factor 0.02835 is an approximation of the exact value (1 ounce = 0.0283495 kg). For calculations requiring high precision, such as in laboratories, it is recommended to use more exact factors. Also, ensure you enter only positive numbers for pounds and ounces, and that ounces do not exceed 15 (since 16 ounces equal 1 pound).

Frequently asked questions

How do I convert only pounds, without ounces?

Simply enter 0 in the ounces field. The converter will consider only the pound value.

Can I convert values with ounces above 15?

Ideally, convert ounces above 15 to pounds (16 ounces = 1 pound) and add to the pounds field, but the converter accepts any value.

What is the margin of error in the conversion?

The error is small, about 0.0002 kg per ounce, due to rounding of the conversion factor.

Does this tool work for any type of weight?

Yes, it works for any object or substance, as long as the weight is given in pounds and ounces.

Why does the result show two decimal places?

To provide sufficient accuracy for everyday use without complicating readability.

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