How to Find Your Windshield Wiper Blade Size

Quick answer: your windshield wiper blade size is the length of each blade in inches, and the driver, passenger, and rear blades often take different sizes. Find it in your owner’s manual, with an auto-parts store or wiper-brand lookup (year, make, model), on the label or part number printed on the old blade, or by measuring each blade end to end. Then match the connector on the wiper arm (J-hook, pinch tab, side pin, bayonet) before you buy.

How to find your wiper blade size, step by step

1. Check the owner’s manual

Look in the index under wiper blades, specifications, or capacities and specifications. Many manuals list driver and passenger lengths (and rear, if fitted). If your paper manual is gone, most carmakers post owner’s manuals free on their websites.

2. Use an auto-parts store or wiper-brand lookup

Auto-parts store websites, wiper brands, and the printed fit books in store aisles ask for year, make, model, and sometimes trim or body style (sedan vs wagon, regular vs crew cab). The result lists each position separately. Write down all of them — driver, passenger, rear — not just the first number you see. Sedans and hatchbacks of the same model can use different blades.

3. Read the old blade’s label or part number

Lift the arm away from the glass and look on the blade frame, the end cap, or the back of the rubber. Many blades show the length (for example “22” or “22 in / 550 mm”) or a brand part number you can type into a store search. The original box, if you kept it, has the same information.

4. Measure each blade tip to tip

Lift the wiper arm off the glass (support it so the spring cannot slap it back onto the windshield).
Hold a tape measure along the blade and measure from one end of the blade to the other, not the arm.
Write down driver, passenger, and rear separately.
If the reading falls between two whole inches, do not just round — cross-check with the manual, a lookup, or the old blade’s label, because some vehicles use odd lengths like 19 or 21 inches.

5. Match the connector on the wiper arm

Length is only half the fit. Look at where the blade meets the arm:

J-hook — the arm end bends into a U shape; the most common style.
Pinch tab — you squeeze two tabs on the blade’s connector to release it.
Side pin — a small pin on the side of the arm slots into the blade.
Bayonet — a flat, narrow arm end that slides straight into the blade.

Photograph the arm tip before you shop. More on this in Match wiper blade adapter before you buy.

Common mistakes when buying wiper blades

Buying two of the same size. Driver and passenger blades are often different lengths. Buy each to its own listed size.
Forgetting the rear wiper. SUVs, hatchbacks, and wagons often have a rear blade with its own length and a specialty connector — see Rear hatch wiper adapter is not a front blade.
Wrong connector. The right length on the wrong adapter will not lock, or will rattle and come loose. Check the box lists your arm type.
Rounding a measurement. A blade that is off by an inch can hit the windshield trim or leave a dry stripe. Confirm with a lookup.
Mixing up styles by side. Some cars pair a spoiler blade on the driver side with a flat blade on the passenger side — see Passenger flat vs driver spoiler mismatch.

Swap without drama

Change one side at a time so you always have a reference for how the old one came off.
Support the arm while the blade is off — springs can snap the bare arm onto the glass (support the arm spring during a blade swap).
Click the new blade until the adapter locks; a half-latched blade can fly off on the highway.
Mist the glass and run the wipers on a wet windshield once before you need them in a storm.

Streaks after a new blade are often dirty glass or a bent arm, not the wrong length — see New wipers still streak or chatter. If the length was wrong, the blade will hit the trim or leave a tall dry band — pull it and correct the size.

Wiper blade size FAQ

Are both windshield wipers the same size?

Often not. Many cars use a longer driver blade and a shorter passenger blade. Some vehicles do use the same length on both sides, so check the listing for your exact model rather than assuming.

Can I use a wiper blade 1 inch longer or shorter?

Stick to the listed size when you can. A blade one inch shorter usually fits but clears a little less glass. A blade one inch longer can overlap the other blade, hit the windshield frame, or run off the glass at the end of its sweep. If you try a different length, run the wipers on wet glass and watch the full sweep before driving.

How do I measure my wiper blades?

Lift the arm, then run a tape measure along the old blade from one end to the other. Measure the blade, not the arm, and do each position (driver, passenger, rear) separately.

Where is the wiper blade size printed?

Check the blade frame, the end caps, or the back of the rubber strip, and the original packaging. The owner’s manual and store lookups list it too.

Beam vs conventional wiper blades — does the size change?

No. Length is measured the same way for beam blades (one curved, frameless strip), conventional blades (a metal frame with pressure points), and hybrid blades (a frame under a cover). You can usually switch styles at the same length if the blade fits your arm connector. For the trade-offs, see Winter beam vs summer conventional blades.

Do rear wipers use the same blades as the front?

Usually not. Rear blades are typically shorter and often use a vehicle-specific connector. Look up the rear position on its own.