The standard width for the average entry door in America is 36". That is not including the frame.
ADA requires 32" clearance when door is open 90 degrees , which results in using a 36" door due to the thickness of the door and projections from the jambs.
Interior doors range in width from 24"-32" in even-number increments. Older homes often have custom widths falling between these numbers. Of these sizes, 30" is the most common in America.
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There is not a quote "standard" door width as doors can be purchased in 2" increments. There are a few building code restrictions for minimum width of certain doors. Like an egress door is required to be 36 inches in width for a residence. There can also be minimum widths for handicap accessibility. These doors in a house need to have a clear opening width of 30 inches.
it can be any width
A standard farm gate would be about 70 cm!
2m or two metresDoors come in a variety of sizes that are considered to be standard widths and heights. There are door for interior doors, exterior doors, closet doors, home doors, mobile home doors, business door, and double doors. Those are just a few. The best way to find the average size of a door for a specific structure is to request information from a retailer in the business of doors because the information on measurements can be infinite.
A standard office chair would vary between 17 to 20 inches.