Ounce to Kilogram Conversion Calculator: Free Online Tool
Convert ounces to kilograms with our free online weight converter.
Ounce to Kilogram Calculator
How to Use the Calculator:
- Enter the value you want to convert in the 'From' field (Ounce).
- The converted value in Kilogram will appear automatically in the 'To' field.
- Use the dropdown menus to select different units within the Weight category.
- Click the swap button (⇌) to reverse the conversion direction.
How to Convert Ounce to Kilogram
Converting Ounce to Kilogram involves multiplying the value by a specific conversion factor, as shown in the formula below.
Formula:
1 Ounce = 0.0283495 kilogramsExample Calculation:
Convert 5 ounces: 5 × 0.0283495 = 0.141747 kilograms
Disclaimer: For Reference Only
These conversion results are provided for informational purposes only. While we strive for accuracy, we make no guarantees regarding the precision of these results, especially for conversions involving extremely large or small numbers which may be subject to the inherent limitations of standard computer floating-point arithmetic.
Not for professional use. Results should be verified before use in any critical application. View our Terms of Service for more information.
What is a Ounce and a Kilogram?
The ounce (oz) is a unit of mass used in the British imperial and United States customary systems of measurement. The most common type today is the international avoirdupois ounce, defined as exactly 1/16 of an avoirdupois pound, or approximately 28.35 grams.
The kilogram is the base unit of mass in the International System of Units (SI). It is defined based on the fixed numerical value of the Planck constant.
Note: The Ounce is part of the imperial/US customary system, primarily used in the US, UK, and Canada for everyday measurements. The Kilogram belongs to the metric (SI) system.
History of the Ounce and Kilogram
The term "ounce" derives from the Roman "uncia", which was one-twelfth of the Roman pound. Its value varied throughout history and regions. The avoirdupois ounce became standardized in the English-speaking world for general trade.
Originally defined as the mass of one liter of water. Later, it was represented by the International Prototype of the Kilogram (IPK), a platinum-iridium cylinder. In 2019, the definition was changed to be based on fundamental physical constants.
Common Uses for ounces and kilograms
Explore the typical applications for both Ounce (imperial/US) and Kilogram (metric) to understand their common contexts.
Common Uses for ounces
- Cooking & Recipes: Standard unit in the US for measuring food ingredients like flour, sugar, spices, and non-liquid items in recipes.
- Packaged Foods: Used for labeling the net weight of many packaged food products (e.g., cereal boxes, canned goods, snacks).
- Postal Services: Used for determining the weight and cost of letters and small parcels, especially in the US.
- Deli & Groceries: Common unit for measuring small portions of items like cheese, deli meats, and specialty foods.
- Precious Metals: Often used to measure the weight of gold, silver, and other precious metals in jewelry and bullion.
Common Uses for kilograms
- Global Standard: The primary unit for mass in science (physics, chemistry), engineering calculations, and international trade (e.g., commodity pricing).
- Body Weight: Widely used worldwide (outside the US/UK primarily) for measuring human body weight for health and fitness tracking.
- Food & Groceries: Used for selling and labeling larger quantities of food items like rice, flour, sugar, and some produce in metric countries.
- Shipping & Logistics: Standard unit for calculating weights of packages and freight internationally.
- Everyday Objects: Measuring the mass of common items like furniture, electronics, or luggage.
Frequently Asked Questions
Questions About Ounce (oz)
How many ounces are in a pound?
There are 16 avoirdupois ounces (oz) in 1 pound (lb).
Is an ounce the same as a fluid ounce?
No. The ounce (oz) measures mass/weight, while the fluid ounce (fl oz) measures volume.
Where is the ounce commonly used?
It is primarily used in the United States for everyday measurements, and to some extent in the UK and Canada, though metric units are more prevalent globally.
About Kilogram (kg)
What is the base unit of mass in the SI system?
The kilogram (kg) is the base unit of mass in the International System of Units (SI).
Is the kilogram used worldwide?
Yes, it's the global standard for science, engineering, and international trade, and widely used for everyday measurements in most countries.
How was the kilogram originally defined?
It was initially defined as the mass of one liter of water, later represented by a physical artifact (the IPK), and is now based on the Planck constant.
Conversion Table: Ounce to Kilogram
| Ounce (oz) | Kilogram (kg) |
|---|---|
| 1 | 0.028 |
| 5 | 0.142 |
| 10 | 0.284 |
| 25 | 0.709 |
| 50 | 1.418 |
| 100 | 2.835 |
| 500 | 14.175 |
| 1,000 | 28.35 |
All Weight Conversions
Other Units from Weight
- Gram (g)
- Milligram (mg)
- Pound (lb)
- Stone (st)
- Ton (metric) (t)
- Ton (US) (ton)
- Ton (UK) (long ton)
- Microgram (µg)
- Carat (ct)
- Slug (sl)
- Troy Ounce (oz t)
- Pennyweight (dwt)
- Grain (gr)
- Dram (dr)
- Quintal (q)
- Atomic Mass Unit (u)
- Pavan (India) (pavan)
- Kati (India) (kati)
- Masha (India) (masha)
- Dina (India) (dina)
- Pras (India) (pras)
- Lota (India) (lota)