- All Categories
- Learn How to Measure Garage Door Torsion Springs (The Right Way)
- Residential Torsions
- Commercial Torsions
- EZ-set Galvanized Torsions
- Mini Warehouse Springs
- Extension Springs
- Installation kit
- Winding Bars (Garage Door Torsion Spring Tools)
- Drums
- Cables
- Hinges
- Rollers
- Weather Seals
- End Bearing
- Garage Door Top & Bottom Brackets Residential & Commercial Hardware
- Operator Brackets (ORB / ARB) + T-Rail Mounting Brackets
- About Us
- Contact Us
- FAQs
How to Measure Garage Door Torsion Springs
The Right Way
A step-by-step guide to getting accurate measurements the first time
Ordering the correct torsion spring starts with accurate measurements. A spring that is even slightly off can make your door feel too heavy, fly open, or put extra strain on your opener. This guide covers exactly what to measure and how to record it, so you can match your replacement springs correctly the first time and avoid the hassle of returns or mismatched parts.
Jump to a Section
Safety Notes
Read This First
Garage door torsion springs are under extreme torque. You can take measurements safely only if you avoid loosening hardware or handling a spring under tension. Improper handling can result in serious injury, death, or property damage.
Loosen set screws on winding cones. The spring is under extreme tension and can release violently.
Keep hands away from cones, cables, and drums while the spring is under tension.
If anything looks damaged, bent, or unstable — stop immediately and contact a qualified garage door technician.
The measurements described in this guide are designed to be taken from a safe position without disturbing any hardware. If you are not comfortable performing these measurements yourself, a qualified garage door technician can do it for you. Your safety is more important than any purchase.
What to Measure
There are four measurements you need to correctly identify and order your replacement torsion spring. Each one is important, and getting all four right ensures a perfect match:
Wire Size
The most critical measurement
Inside Diameter
The hollow space inside the coil
Spring Length
Measured when relaxed only
Wind Direction
Left-wound or right-wound
Step 1: Find the Wire Size
MOST IMPORTANT MEASUREMENT
The wire size determines how much lifting force the spring produces. This is the single most critical measurement because even a small error in wire size results in a spring with significantly different torque characteristics. The most reliable method is measuring a set number of coils and matching the result to a reference chart.
How to Measure Wire Size
Choose a section of the spring where the coils are tight together with no gaps between them. Avoid areas near the ends or near any damage.
Using a tape measure, measure the total length of exactly 10 coils laid tightly together.
For confirmation, measure exactly 20 coils and verify it matches the expected value for the same row in the chart below.
If your 10-coil and 20-coil results do not line up with the same row, re-measure in a different spot on the spring to rule out a measurement error.
Wire Size Reference Chart
Use the row that matches your measurement. These are the standard coil-measurement values used in torsion spring sizing:
| 10 Coils (in) | 20 Coils (in) | Wire Size (in) |
|---|---|---|
| 1 3/4" | 3 1/2" | 0.177 |
| 1 7/8" | 3 3/4" | 0.187 |
| 1 15/16" | 3 7/8" | 0.192 |
| 2" | 4" | 0.200 |
| 2 1/16" | 4 1/8" | 0.207 |
| 2 3/16" | 4 3/8" | 0.218 |
| 2 1/4" | 4 1/2" | 0.225 |
| 2 5/16" | 4 5/8" | 0.234 |
| 2 7/16" | 4 7/8" | 0.243 |
| 2 1/2" | 5" | 0.250 |
| 2 5/8" | 5 1/4" | 0.262 |
| 2 3/4" | 5 1/2" | 0.273 |
| 2 13/16" | 5 5/8" | 0.283 |
Step 2: Measure the Spring Inside Diameter
The inside diameter (I.D.) is the open hollow space inside the coil. It is measured from a side view and does not include the cones at either end of the spring.
Two Ways to Get the Inside Diameter
Measure across the inside opening of the coil from inside edge to inside edge. This gives you the true inside diameter directly. Make sure you are measuring the hollow space, not the outer width of the coil.
If you can only measure the outside diameter (O.D.), use this formula:
I.D. = O.D. - (2 x wire size)
Example: If your O.D. is 2.414" and wire size is 0.207", then I.D. = 2.414 - (2 × 0.207) = 2.000"
Tip: Many winding cones and stationary cones have stamps or markings that indicate the I.D. size. Common I.D. sizes for standard residential garage doors are 1 3/4" and 2". Larger commercial or heavy-duty doors may use larger inside diameters.
Step 3: Measure the Spring Length
ONLY MEASURE WHEN THE SPRING IS RELAXED
Spring length must be measured in the spring's relaxed (unwound) state. A wound spring under tension can read several inches longer than its true length, which would result in ordering the wrong size.
How to Measure Length Correctly
If the spring is unbroken and still on the shaft:
Measure coil-to-coil length from end to end. Do not include the winding cone or stationary cone in the measurement. Only measure the actual coil section of the spring.
If the spring is broken into pieces:
Lay the pieces in a straight line on a flat surface. Measure each coil section individually, then add them together to get the total relaxed length. Make sure the pieces are aligned end-to-end without overlapping.
Step 4: Confirm Wind Direction
Wind direction matters most on single-spring setups. On two-spring systems, the springs are typically wound in opposite directions. Getting the wind direction wrong will prevent the spring from functioning correctly and could create a dangerous situation.
How to Identify Wind Direction
Visual inspection: The coil "twist" direction can indicate whether the spring is left-wound or right-wound. Look at how the coils angle as they wrap around the shaft.
Cone color markings: Many winding cones and stationary cones have color-coded markings or stamped labels that help identify the spring wind direction. Check both ends of the spring for any such markings.
Standard configuration: On most residential garage doors, the spring on the left side (standing inside facing the door) is typically right-wound, and the spring on the right side is typically left-wound. Always verify against your specific setup.
If you are replacing both springs (which is recommended), you will need one left-wound spring and one right-wound spring. When placing your order, make sure to specify the correct wind direction for each spring.
Why Getting These Measurements Right Matters
A correctly sized torsion spring is essential for the safe and reliable operation of your garage door. Here is what happens when the measurements are right — and what can go wrong when they are not:
With Correct Measurements
The door lifts smoothly with proper balance
Reduced strain on the garage door opener motor
Safe, consistent operation with no sudden movements
Maximum spring lifespan and value from your purchase
With Incorrect Measurements
Door feels too heavy or dangerously light when manually operated
Door slams shut unexpectedly or flies open with excessive force
Extra strain on the opener motor can cause premature failure
Potential for unsafe door behavior and injury risk
An incorrect wire size or diameter can lead to the wrong torque, which means your door will not operate as it should. This is why we always recommend double-checking your measurements using both the 10-coil and 20-coil methods before placing your order.
Measurement Checklist
Before you order, make sure you have recorded all of the following. Fill in each field and bring this information with you when placing your order or contacting us for help.
You can type directly into the fields below. Print this page or take a screenshot to keep your measurements handy.
Not sure about something? Send us your measurements along with photos by emailing info@bestgaragedoorparts.com or call us at +1 386-569-8223. Our team will verify your measurements and help you order the correct springs before you spend any money.
Ready to Order Your Torsion Springs?
Now that you have your measurements, browse our selection of torsion springs. We carry a full range of sizes, wire gauges, inside diameters, and cycle life ratings to match virtually any standard residential garage door.
Final Safety Disclaimer
Working around garage door torsion springs can be dangerous. The springs are under extreme torque and can cause serious injury, death, or property damage if handled improperly.
The measurement guide on this page is intended to help you identify the correct replacement spring safely from a distance without disturbing any hardware. You should never loosen, unwind, remove, or attempt to repair a torsion spring yourself unless you are a trained and qualified garage door professional.
If you are unsure about any measurement, if anything on your spring system appears damaged or compromised, or if you simply do not feel comfortable performing these measurements, please contact a qualified garage door technician. We also recommend professional installation for all torsion spring replacements.
Any measuring, repair, or installation work is performed entirely at your own risk. Best Garage Door Parts and SUPLINK TECH CORP are not liable for any injury, death, or property damage resulting from work performed on garage door springs or related components. See our full Disclaimer for complete legal terms.