Translation guide
An ounce is a unit of weight used in the US and UK. In Japanese, it is usually expressed using the loanword オンス, but the metric system is standard, so conversions may be needed.
To refer to the imperial/US customary unit of weight equal to about 28.35 grams.
To refer to a fluid ounce, a unit of volume (about 29.6 ml in the US, 28.4 ml in the UK).
While オンス is understood, Japan officially uses the metric system. For everyday conversations, converting to grams or milliliters is often clearer. In cooking, Japanese recipes use grams and milliliters, so you may need to convert when following a recipe from an English source.
This recipe requires 4 ounces of butter.
金の価格は1オンスあたり2000ドルです。
The price of gold is $2000 per ounce.
Since Japan uses the metric system, it's often more natural to convert ounces to grams. 1 ounce ≈ 28.35 grams. Use this when precision is needed or when talking to someone unfamiliar with imperial units.
約28グラムです。
It's about 28 grams.
このステーキは300グラムあります。
This steak is about 10.6 ounces.
The technical term for fluid ounce. Used in scientific or precise contexts. In everyday conversation, people might just say オンス and rely on context.
この缶には12液量オンスのソーダが入っています。
This can contains 12 fluid ounces of soda.
In Japan, volume is measured in milliliters. 1 US fluid ounce ≈ 29.6 ml. Converting makes it easier for Japanese speakers to understand.
約30ミリリットルです。
It's about 30 milliliters.