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Determine the correct number, size, and placement of hinges for your doors and cabinets. This calculator helps ensure proper weight distribution and smooth operation.
Description: Traditional hinge type with two plates connected by a pin. Visible and reliable.
Best For: Most interior and exterior doors
Advantages: Affordable, proven design, easy to install and repair
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The most common hinge type, consisting of two rectangular plates connected by a pin. Visible when door is opened.
Long continuous hinges running the full height of the door, providing excellent weight distribution.
Hidden hinges mounted inside the door frame, invisible when door is closed. Modern aesthetic appeal.
Reinforced hinges with extra material for industrial and high-traffic commercial applications.
Quick reference for common door sizes and recommended hinge specifications:
| Door Size | Weight Range | Hinges Needed | Hinge Size | Type |
|---|---|---|---|---|
| 24" × 36" | 20-30 lbs | 2 | 3" | Butt |
| 32" × 80" | 40-60 lbs | 3 | 3.5" | Butt |
| 36" × 84" | 60-100 lbs | 3 | 4" | Butt |
| 42" × 84" | 80-120 lbs | 4 | 4" | Butt |
| Full length | 100+ lbs | Continuous | Continuous | Piano |
| 36" × 84" | 80-150 lbs | 2 | Continuous | Concealed |
| 42" × 84" | 150-250 lbs | 3 | 5" | Heavy-duty |
Standard Doors (up to 80")
• Top hinge: 3" from top
• Bottom hinge: 3" from bottom
• Middle hinge (if needed): Centered
Tall Doors (80-100")
• Top hinge: 4.5" from top
• Bottom hinge: 4.5" from bottom
• Space middle hinges evenly
Very Tall Doors (100"+)
• Top hinge: 6" from top
• Bottom hinge: 6" from bottom
• Consider piano hinge for support
•Always mount hinges vertically aligned for smooth operation
•Use a level to ensure proper alignment during installation
•For heavy doors, reduce spacing from edges for better support
•Never place hinges less than 2" from corners or edges
•Equal spacing between multiple hinges ensures load distribution
•Piano hinges should extend nearly the full door height
•Pre-drill screw holes to prevent wood splitting
The number of hinges depends on door height and weight. As a rule: 2 hinges for doors up to 60 lbs, 3 hinges for 60-150 lbs, and 4+ hinges for heavier doors. Taller doors may need more hinges for support.
Standard residential doors use 3" to 4" butt hinges. Size increases with door height. Measure the height of the closed hinge when comparing sizes. Heavy-duty applications use larger hinges or continuous piano hinges.
Yes, piano hinges work well on regular doors, especially if they tend to sag or are heavy. They provide excellent weight distribution and smooth operation. They're more visible but very reliable.
Sagging is usually caused by inadequate hinges or spacing that's too far from the top. Solutions: add an extra hinge, reduce the distance from the top, or upgrade to heavier-duty hinges. Piano hinges eliminate sagging completely.
Typically 3-6 inches from the top and bottom, depending on door height. Heavier doors benefit from increased distance. Never place hinges less than 2 inches from the edges.
Ball bearing hinges have balls that reduce friction and are better for heavy doors or high-traffic areas. Plain hinges are simpler and adequate for most residential applications. Ball bearing hinges last longer under heavy use.
Yes, common finishes include brass, chrome, stainless steel, and painted finishes. Choose based on appearance and the door environment. Stainless steel is ideal for exterior doors and wet areas.
Mark hinge locations precisely, mortise the door and frame to the hinge thickness, align hinges vertically, pre-drill screw holes, and secure with appropriate screws. Use a level during installation for smooth operation.
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