Depends on the size.
40g
0.5 oz
The weight of keys can vary depending on the number of keys on the keychain and the type of keys. On average, a single key weighs about 0.25 to 0.5 ounces.
It can cost as much as about 300 dollars to re-key the average car. This varies depending on the type of ignition and the type of key.
3 grams
The weight of a key can vary depending on its size, material, and design. On average, a standard key may weigh between 5-20 grams.
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A medieval key would typically weigh around 2-4 ounces, depending on the size and material used. Keys during this time were often made of iron or bronze.
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