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How do I know what size my headlights are?

Knowing the size of your vehicle's headlights is important for replacing them or upgrading to brighter bulbs. Fortunately, there are a few simple ways to determine the headlight size on your car or truck.


Measure the Headlight Diameter


The most accurate way to determine your headlight size is to physically measure the diameter of the headlight lens. Use a ruler or tape measure to measure the widest part of the headlight from one edge to the other. Common headlight sizes include 5.75 inches, 6 inches, 7 inches, and 9 inches.


Check the Owner's Manual


Your vehicle's owner's manual will typically list the headlight size as a specification. This is the easiest way to find the correct headlight size without having to measure.


Look Up Your Vehicle Model



  • Search online for your specific make, model, and year of vehicle.

  • Many automotive parts websites have databases that allow you to look up the correct headlight size based on your vehicle information.

  • You can also check with your local auto parts store, as they often have access to databases with headlight size information.


Knowing the right headlight size for your vehicle is important to ensure you purchase the correct replacement bulbs or upgrade to brighter LED headlights. Taking a few minutes to measure or look up the size can save you time and money in the long run.

How do I find out what bulb I need for my headlights?


Every headlight is designated with a bulb size. For a bulb installed in your car, you can find the number stamped or printed on the side of the bulb. It's also listed in the service manual and in an auto bulb guide. Only the correct bulb size will fit in the headlamp housing and connect to the factory wiring.



How do I know which headlight assembly to buy?


Vehicle Compatibility
Before anything else, make sure the headlight assembly replacement you're getting is compatible with your vehicle's specifications. By checking your vehicle's year, make, and model, you'll be sure to find a direct-fit headlight assembly for your ride.



How do I find the part number for my headlight?


The OEM part number can be found directly on the part itself. You can also call a dealership with your VIN, and they will provide you with the OEM part number. You can give one of our car specialists a call at 1-888-907-7225 for further assistance in purchasing your headlight assembly.



Do I need H11 or 9005?


A: H11 bulbs use lower wattage and are better suited for low beams. 9005 bulbs have higher wattage ratings and mainly used as high-beam headlight bulbs.



Does it matter if headlight is 9005 or 9006?


In summary, 9005 and 9006 bulbs have a very similar single-filament halogen design. However, their different sizes mean they cannot be swapped between headlight housings. The 9005 bulb has higher wattage, making it better suited for high beams. Meanwhile, the lower powered 9006 mostly found in low beam applications.



What are the three types of headlights?


There are three main types of headlights: LED, HID or 'xenon', and halogen.



How do I find my headlight model?


Go ahead and ask the dealer and say, "Just what kind of headlights do I have, man?" They'd be happy to help you out. The other option you can do, as well, is to check your vehicle handbook and see if there's a VIN number in there, on the door jamb, or in the front corner of your dashboard.



Can I use H11 for high and low beam?


H11, also known as H8/H9 LED headlights can be used to replace both high beams and low beams, they also used fog lamps H11 for some vehicles.



How do I know which headlights will fit my car?


You can contact your vehicle manufacturer for the bulb fitting information, or simply take a look in your vehicle handbook, which should state all the fittings that your vehicle needs for each type of light.



How to identify light bulb size?


The numbers of the bulb indicate its size, which is based on its diameter at its widest point, measured in eighths of an inch (⅛”). For example: An A19 bulb indicates that the bulb comes in a standard household shape (code A), and the '19' indicates that the bulb is 19/8ths inches in size.


Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.