Windshield Wiper Size Calculator

Windshield wiper replacement intervals are determined by the degradation of the rubber wiper blade, which is caused by UV exposure, temperature extremes, ozone, and physical abrasion. A wiper that leaves streaks, skips, chatters, or squeaks needs replacement — regardless of how much time has passed.

General replacement guideline:

Replacement Interval = 6 to 12 months (standard rubber blades)

Replacement Interval = 12 to 24 months (silicone or beam blades)

In regions with extreme heat, UV, or heavy rain/snow, lean toward the shorter end of these ranges.

Degradation scoring — a practical inspection guide:

Inspect each blade on four criteria (score 0 = none, 1 = minor, 2 = severe):

• Streaking: water smeared across glass after each pass
• Skipping: blade bouncing or chattering across glass
• Edge cracking: visible deterioration of the rubber contact edge
• Frame corrosion: rust or bend in the wiper arm/frame

Replacement Score = Sum of criteria scores

• 0–2: Acceptable, monitor at next service
• 3–5: Replacement recommended soon
• 6–8: Replace immediately: safety risk

Blade type comparison:

Wiper size note: Driver and passenger blades are almost always different lengths. Always check your vehicle’s specific sizing in the owner’s manual or a parts store fitment guide — installing the wrong size can leave uncleaned zones or damage the motor.

Rear wiper: If your vehicle has one, replace it simultaneously — it endures similar wear.