Size of door doesn t matter besides it would.
How many hinges on an internal door.
As a general rule you will want to use 1 hinge per every 30 inches of door or fraction thereof.
Referring to door height.
Standard internal doors i advise 3 x 3 roller bearing hinges per door top hinge set 6 from the top of the door bottom hinge set 9 from the bottom of the door and finally the middle hinge set halfway between the top and bottom hinge.
Doors up to 60 inches need 2 hinges.
However this changes when you come to doors like fire doors the hinge class that is needed will increase.
A pair of hinges is two complete sets of hinges as displayed below.
To roughly between 5 to 8.
The chart below will provide you with the number of hinges that are needed based on the height of your door.
For doors over 2200mm tall then four hinges can be used to prevent warping.
Doors over 60 inches but not over 90 inches need to use 3 hinges.
But normally it depends on the weight of the door.
Standard 60 doors typically require three hinges but anything taller than that may require more.
References stanley hardware.
Usually at least 3 hinges need to be fitted on a door.
A couple things to make a note of before purchasing your door hinges.
If you have a particularly heavy door and want to use four hinges divide the top to bottom measurement by three instead of two and place your hinges accordingly.
Fire regulations require fire doors to be fitted with 3 hinges which must be 4 inch fire certified hinges.
Light weight internal domestic doors may be fitted with only 2 hinges.
Maybe the 3 hinged doors you see are not hollow core.
Generally for normal internal doors you should only need between a 1 and 4 hinge class.
Doors with a security function need to have at least 3 hinges as this makes them more difficult to force.
Doors over 90 inches but not over 120 inches 4 hinges are recommended.
Opening heights 7 6 1 16 through 10 0 two pair butt hinges from under head cl 9 3 4 top of door 9 5 8.
Center hinge is equally spaced between top and bottom 3.