How to Measure for a Garage Door Spring Repair

Precision is essential for safe garage door operation. You cannot guess based on door height or weight alone. Professionals use a “20-coil measurement” to identify wire size. Measure across 20 coils with a ruler and consult a conversion chart for the exact gauge.

Next, find the inside diameter. Most residential springs are 2 inches or 2.25 inches wide. This number is often stamped on the end cones. Finally, measure the total length from the first coil to the last. Do not include the cones in this measurement. If the spring is broken, press the pieces together for an accurate reading.

Identifying the Wind: Left vs. Right Hand

Determining the “wind” direction is a critical step. This refers to how the wire wraps, not where the spring sits. Usually, a right-hand wind spring is on the left side of the bracket. A left-hand wind spring is typically on the right.

Check the wire tail at the end of the spring. If it wraps clockwise, it is a right-hand wind. If it wraps counter-clockwise, it is a left-hand wind. Installing the wrong wind will cause immediate failure. Always double-check this orientation before ordering parts.

Weight and Track Considerations

Physical dimensions must match the door’s total weight and track radius. A 15-inch radius track requires different torque than low-headroom tracks. Adding insulation or windows changes your spring requirements. These additions may make your original measurements obsolete.

Weigh your door using an analog scale for accuracy. Disconnect the opener and lower the door onto the scale. This weight helps confirm if your spring dimensions match the actual load. If the weight and measurements don’t align, you may need a different wire gauge for a smooth lift.