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How Wiper Blade Sizes Work
Wiper blades are measured in inches (the UK and US standard) or millimetres. The most common sizes range from 10 inches (250mm) for rear wipers to 28 inches (700mm) for large driver-side blades.
Your car will have two different sizes for the front — a longer driver-side blade and a shorter passenger-side blade. This is because the driver needs maximum visibility, while the passenger side has a smaller sweep area.
Common Wiper Blade Sizes
| Inches | Millimetres | Typical Use |
|---|---|---|
| 10″ | 250mm | Rear wiper (small cars) |
| 12″ | 300mm | Rear wiper (most cars) |
| 14″ | 350mm | Rear / short passenger |
| 16″ | 400mm | Passenger side |
| 18″ | 450mm | Passenger side |
| 20″ | 500mm | Passenger / driver |
| 22″ | 550mm | Driver side (compact) |
| 24″ | 600mm | Driver side (medium) |
| 26″ | 650mm | Driver side (most popular) |
| 28″ | 700mm | Driver side (large) |
Recommended Wiper Blades
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Why Size Matters
Using the wrong size wiper blade causes several problems:
- Too long: Blades collide with each other or the windscreen frame, causing damage and uneven wiping.
- Too short: Reduced visibility area, with unwiped sections at the edges of your windscreen.
- Wrong fitting: The blade won’t attach to the arm at all, or falls off while driving.
How to Measure Your Wipers
If you’re unsure of your size, measure the rubber blade from end to end (not including the arm connector) with a tape measure. Round to the nearest even inch. Alternatively, use our wiper blade finder — simply select your car make and model.
Frequently Asked Questions
Are wiper blade sizes universal?
No. Each car model requires specific sizes for driver, passenger, and rear wipers. The fitting type also varies between manufacturers.
Can I use a slightly bigger wiper blade?
Going 1 inch longer occasionally works, but risks the blades hitting each other or the windscreen frame. Always use the manufacturer-specified size.
Are wiper blade sizes the same for left and right-hand drive?
The blade sizes are the same, but the driver/passenger positions are swapped. In UK right-hand drive cars, the longer blade is on the right (driver) side.
Length is only half the answer — the connector on the arm decides which blades will physically fit. See how to identify your wiper arm fitting.
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How we check fitment for this guide
We cross-reference fitment figures against manufacturer specifications and OE-supplier catalogue data where available, and matched to the standard codes that actually govern fit — battery type/group sizes, wiper lengths and fitting types, bulb fitment codes, tyre size markings, and oil specifications. We work by make, model, year, engine, and build date, because a single model can take different parts across its life. Where the right part depends on your exact vehicle, we tell you to confirm by registration or VIN. More on our method →