Vehicle Bulbs Size Chart

Use the SAWE Vehicle Bulb Size Guide to find replacement bulb sizes by vehicle make, model, year and lighting position. Our guides cover common automotive bulbs for headlights, fog lights, turn signals, brake lights, reverse lights, license plate lights, map lights, dome lights and other interior and exterior lighting positions.

Start with your vehicle make. Then select your model and model year. Bulb sizes can vary by trim level, factory lighting package and production year, so always confirm your original bulb or owner's manual before ordering.

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Popular Vehicle Bulb Size Guides

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Common Automotive Bulb Sizes

Many vehicles use the same bulb families across different lighting positions. The exact application depends on the vehicle year, model, trim and factory lighting system.

T10 194 / 168
T15 912 / 921
T20 7440 / 7443
T25 3156 / 3157
BA15S 1156 / 7506
BAY15D 1157
Festoon 31mm / 36mm / 41mm
Headlight H11 / 9005 / 9006 / H4

How to Find the Correct Bulb Size

  1. Select your vehicle make and model. Start with the manufacturer, then open the bulb size guide for your vehicle.
  2. Choose the correct model year. Bulb sizes can change between vehicle generations and even between nearby model years.
  3. Find the lighting position. Check whether you are replacing a headlight, fog light, reverse light, brake light, turn signal, license plate light, map light, dome light or another lighting position.
  4. Verify before ordering. Compare the listed size with the number printed on your original bulb or check your vehicle owner's manual.

Vehicle Bulb Size FAQ

How do I know what bulb size my car uses?

Use your vehicle make, model and year to locate the correct bulb chart. You can also check the number printed on the original bulb or confirm the specification in your owner's manual.

Can the same vehicle use different bulb sizes?

Yes. Bulb sizes may vary by model year, trim level, factory headlight system and lighting position.

Are 194 and 168 bulbs interchangeable?

194 and 168 bulbs commonly share the T10 wedge base, but brightness, wattage and application can vary. Check the vehicle application before replacement.

What is the difference between 7440 and 7443 bulbs?

Both use the T20-style base, but 7440 is generally a single-circuit bulb while 7443 is generally a dual-circuit bulb. Always match the electrical contact configuration required by the vehicle.

What are common interior car light bulb sizes?

Common interior bulb families include T10 194/168, DE3175-style festoon bulbs, 31mm, 36mm and 41mm festoon bulbs. The correct size depends on the vehicle and lighting position.

Fitment Notice: Automotive bulb sizes can vary by vehicle year, trim, production date, factory lighting package and regional specification. Verify the original bulb number or owner's manual before purchasing a replacement.