What Is Oz to Kg Conversion?

Converting ounces to kilograms is necessary when American measurements need to fit international standards. Kilograms are the global metric standard, required for customs, science, and most of the world's commerce.

When You Need This Conversion

International shipping — Customs declarations require kg
Scientific work — Research uses metric only
Medical records — International healthcare uses kg
Metric fitness apps — Setting up profiles
Product specifications — For global markets
Academic papers — Metric is required

The Conversion Factor

One ounce equals exactly 0.0283495 kilograms (or 28.3495 grams). For practical math, divide ounces by 35 to approximate kilograms.

The Path: oz → g → kg

You can also convert stepwise: multiply oz by 28.35 to get grams, then divide by 1000 to get kg. Same result, sometimes easier math.

How to Convert Oz to Kg

Using This Converter

Enter weight in ounces
See the kilogram equivalent instantly
Use swap to convert kg to oz
Copy the result for forms or documents

Quick Mental Math

Divide by 35 — Quick approximation
Or multiply by 0.028 — More precise
Remember: 16 oz = 0.454 kg (1 pound)

Common Reference Points

8 oz = 0.23 kg (half pound)
16 oz = 0.45 kg (1 pound)
32 oz = 0.91 kg (2 pounds)
35 oz ≈ 1 kg
64 oz = 1.81 kg (4 pounds)

For Customs Forms

International shipping requires kilogram weights. Convert your ounce measurements precisely for customs declarations.

Features & Use Cases

Instant Bidirectional Conversion

Convert oz to kg or kg to oz with one click. Essential for bridging US and international systems.

Common Use Cases

International Shipping

Customs forms require kilogram weights. Convert your ounce measurements for accurate international documentation.

Scientific Research

Academic and scientific contexts require metric units. Convert any US measurements to kilograms for papers and reports.

Medical Applications

International medical records use kilograms. Convert ounce-based measurements for proper documentation.

E-commerce

Product specifications for global markets need kilogram weights. Convert for international listings.

Fitness Apps

Many apps default to kilograms. Convert your ounce-based food tracking or body measurements.

Reference Table

Common ounce values from 4 oz to 100 oz with their kilogram equivalents.

Frequently Asked Questions

How many kilograms in an ounce?

One ounce equals 0.0283495 kilograms (about 28.35 grams).

How many ounces make 1 kilogram?

One kilogram equals 35.274 ounces.

How do I convert 48 oz to kg?

Divide by 35.27: 48 ÷ 35.27 = 1.36 kg. Or 48 × 0.0283 = 1.36 kg.

Is this for regular ounces or troy ounces?

This converts avoirdupois ounces (28.35g), used for food and general purposes. Troy ounces (31.1g) are only for precious metals.

Why do international forms need kilograms?

The kilogram is the SI standard for mass, used globally for trade, science, and legal purposes. International agreements standardize on metric.

How accurate should my conversion be?

For shipping, round to 0.01 kg (10g). For science, use full precision. For cooking and everyday use, 0.1 kg is usually fine.

Ounces to Kilograms