Ounces to Kilograms (oz to kg) Converter

Ounces to Kilograms Conversion

Ounces are imperial and kilograms are metric, so this converter brings small US weights into the metric system. It is useful for international shipping, science, and metric-based forms.

Conversion formula: 1 oz = 0.0283495 kg — divide ounces by 35.274.

When You Need This

International shipping — converting ounce weights to kg
Scientific work — metric measurement
Customs forms — metric-based declarations
Precious metals — bar weights in ounces
Recipes — adapting ounce amounts to metric

How to Convert

The Conversion Formula

One ounce equals 0.028349523125 kilograms. To convert, divide ounces by 35.274 (or multiply by 0.02835). For a quick estimate, divide by 35. To reverse, multiply kilograms by 35.274.

kilograms = ounces ÷ 35.274 — for example, 32 oz ÷ 35.274 ≈ 0.91 kg.

Using the Tool

Enter the value

Type the amount you want to convert into the input field.

Read the result instantly

The converted value appears immediately in the second field — no button to press.

Swap or pick any unit

Press the swap button to reverse direction, or open a dropdown to choose a different unit.

Copy the result

Tap the copy icon next to either field to copy the value for your records.

Worked Examples

Ounces	Calculation	Kilograms
1 oz	`1 ÷ 35.274`	0.028 kg
16 oz	`16 ÷ 35.274`	0.45 kg
32 oz	`32 ÷ 35.274`	0.91 kg
100 oz	`100 ÷ 35.274`	2.83 kg

Features & Use Cases

Tool Capabilities

Instant Two-Way Conversion

Results update as you type. Use the swap button to reverse the direction in one click.

Any Unit, Any Pair

Searchable dropdowns let you switch to grams, ounces, pounds, stone, tons, carats and more — not just the default pair.

Copy & Quick Reference

Copy either value with one tap, and check the built-in reference table for common conversions at a glance.

Common Use Cases

International Shipping

Customs forms for most countries use kilograms. Convert ounce-weighed parcels to kg for accurate declarations.

Scientific Work

Science uses the metric system. Convert ounce measurements to kilograms for calculations and lab records.

Precious Metals

Metal bars are often listed in ounces. Convert to kilograms to compare holdings and value across markets.

Recipe Adaptation

Large US recipes use ounces; metric cooks prefer kilograms. Convert bulk amounts to kg for big-batch cooking.

Runs in your browser: All calculations happen locally on your device. Nothing is uploaded — fast and private.

Frequently Asked Questions

How many kilograms are in an ounce?

One ounce equals 0.0283495 kg, about 28.35 grams.

How do I convert 32 ounces to kilograms?

Divide by 35.274: 32 ÷ 35.274 ≈ 0.91 kg (about 2 lb).

Is 35 ounces about 1 kg?

Yes. 35.27 oz = 1 kg, so 35 oz is just under a kilogram.

Why convert ounces to kilograms?

Most of the world and all science use the metric system, so kg is needed for forms, shipping, and calculations.

Does this use the avoirdupois ounce?

Yes, the everyday avoirdupois ounce (28.35 g). The troy ounce (31.10 g) is only for precious metals.

How many kilograms is 16 oz?

16 oz (one pound) ≈ 0.454 kg.

Ounces to Kilograms