Gate hinges are measured by size, load capacity, and mounting geometry. Getting the measurements right is essential to ensure the gate opens smoothly, carries its weight safely, and aligns correctly with the post or frame.

Below is a clear, practical guide used by installers and manufacturers.

1. Measure the Hinge Size (Leaf Length)

For most gate hinges (strap hinges, T-hinges, butt hinges):

• Hinge size = the length of the hinge leaf

• Measured from end to end, not including pins or caps

Examples

• 300 mm gate hinge = hinge leaf is 300 mm long

• 12-inch hinge = hinge leaf is 12 inches long

For strap or T-hinges, the strap length is especially important because it spreads load across the gate.

2. Measure Hinge Width (Leaf Width)

• Measured perpendicular to the hinge pin

• Determines how much surface area contacts the gate or post

This affects:

• Strength

• Fastener placement

• Clearance between gate and post

3. Measure Pin Diameter (Critical for Heavy Gates)

The hinge pin diameter is measured across the pin’s thickness.

• Larger pin = higher load capacity

• Especially important for:

• Steel gates

• Driveway gates

• Heavy timber gates

If the pin is removable, measure it directly. If not, check manufacturer specs.

4. Measure Open and Closed Width (Butt Hinges)

For butt-style gate hinges:

• Closed width: hinge width when folded

• Open width: hinge width when fully opened flat

This affects:

• Mounting recess depth

• Gate clearance

5. Measure Offset (Adjustable or Hook-and-Band Hinges)

For adjustable gate hinges:

• Offset = distance between hinge pin center and mounting surface

• Measured from:

• Center of pin → mounting plate or hook

Offset controls:

• Gate swing clearance

• Alignment adjustment

• Sag correction

6. Measure Load Rating (Weight Capacity)

Gate hinges are always rated by maximum gate weight.

To size correctly:

• Divide total gate weight by number of hinges

• Add a safety margin

Example:

• Gate weight: 60 kg

• Two hinges → each hinge must support at least 30 kg, preferably more

Never size hinges at their maximum rating.

7. Measure Gate Thickness (Compatibility Check)

Some hinges are designed for specific gate thicknesses.

• Measure gate thickness at hinge mounting point

• Ensure fasteners fully penetrate without splitting material

This is especially important for wooden gates.

Common Gate Hinge Measurement Summary

Common Measurement Mistakes to Avoid

• Measuring only hinge length and ignoring weight rating

• Ignoring pin diameter on heavy gates

• Using Door Hinge measurements for gates

• Not accounting for gate thickness

• Undersizing hinges for outdoor use

Summary

Gate hinges are measured by leaf length, leaf width, pin diameter, offset, and load rating—not just by overall size. For reliable performance, always match hinge measurements to gate weight, gate width, and mounting style.