How to measure wiper blade size
Wiper blade sizes are measured in inches and refer to the length of the rubber blade element — not the metal arm. Most vehicles use two different sizes on the driver and passenger sides, and a third separate size for the rear wiper if the vehicle has one.
Wiper blade size is the length of the rubber blade element, measured tip to tip in inches. Driver, passenger, and rear blades are different sizes on most vehicles — measure each one separately, or use your year, make, and model to look up the verified sizes instantly.
What you need
- Tape measure or ruler
- Two minutes per blade
- Vehicle parked safely on level ground
- Care when lifting the arm — it is spring-loaded
You do not need to remove the blades to measure them. Measure them in place on the arm.
Step-by-step: measuring the front blades
Pull the wiper arm away from the windshield until it locks in the upright position. Do this gently — the arm is spring-loaded and can snap back if released. On some vehicles you may hear a light click when it locks open.
Place your tape measure at one tip of the rubber blade and measure to the other tip. You are measuring the rubber or silicone element only — not the metal frame or the arm itself. That measurement is the blade length.
Wiper blades are sold in whole-inch increments. If your measurement reads 25.5 inches, the blade is likely 26 inches. If you get 27 inches, your vehicle may genuinely use a 27-inch blade — some European vehicles do.
Repeat for the passenger side. On nearly all vehicles, the driver side is longer than the passenger side. Do not assume they are the same — buying two identical blades is a very common mistake.
Measuring the rear wiper blade
- Measure the same way — rubber tip to rubber tip.
- Rear blades are almost always shorter than the front blades, typically 11″ to 16″.
- The rear blade is a separate size from both front blades — do not substitute.
- Some vehicles do not have a rear wiper at all. Check your liftgate or tailgate glass.
Not sure if your vehicle has a rear wiper? See our guide on which vehicles have rear wipers →
Why are the driver and passenger blades different sizes?
The driver-side blade is almost always longer because it covers a larger sweep area on the windshield. The driver needs maximum visibility, so that blade clears a bigger arc. The passenger-side blade is shorter — bounded by the A-pillar on one side and the driver blade’s sweep path on the other.
On most mainstream US vehicles, the size difference is between 4 and 10 inches. For example:
- Toyota RAV4 26″ driver — 16″ passenger
- Honda CR-V 26″ driver — 17″ passenger
- Ford F-150 22″ driver — 22″ passenger (equal-length blades)
- BMW X5 26″ driver — 17″ passenger
Can I use a blade that is 1 inch off?
No. A blade that is too long can hit the window frame or the opposing blade’s sweep path, causing noise, chatter, and potential arm damage. A blade that is too short will leave an uncleared strip of glass — right in the driver’s sightline. Always use the exact size for your vehicle.
Skip the measuring — look up your vehicle
If you know your vehicle’s year, make, and model, you do not need to measure at all. Published lookup pages show source-backed driver and passenger sizes, rear wiper status where applicable, and connector verification status when that field has been checked.
Look up your vehicle →