Vehicles & Transport calculator
What Wiper Blade Size Do I Need?
Calculate wiper blade lengths using measured/oem driver blade length, measured/oem passenger blade length, and rear blade length.
Enter your measurements
Before choosing a product, measure measured/oem driver blade length, measured/oem passenger blade length, and rear blade length. The what wiper blade size do i need tool uses those values to calculate wiper blade lengths and makes the limiting measurement clear.
- Measured/OEM driver blade length — Required
- Measured/OEM passenger blade length — Required
- Rear blade length — Optional
Wiper blade lengths
Enter the measurements above to calculate wiper blade lengths.
How the calculation works
V14 calculation: requiredDriverBladeLength=driverBladeLength; requiredPassengerBladeLength=passengerBladeLength; requiredRearBladeLength=rearBladeLength when rearBladeLength is supplied. This is the implementation specification for this calculator.
Worked example
Example: Measured/OEM driver blade length = 66 cm; Measured/OEM passenger blade length = 46 cm; Rear blade length = 33 cm. Result: Required Rear Blade Length = 33 cm; Required Passenger Blade Length = 46 cm; Required Driver Blade Length = 66 cm.
Before you decide
The result is only as accurate as the measurements entered. This page calculates the stated geometry or quantity only; product-specific construction or installation details can still affect the final choice. For what wiper blade size do i need, the limiting result on this page is wiper blade lengths.
Direct measurement/geometry calculation. No external reference is required for the arithmetic itself; the result is derived only from the user-entered measurements and the formula stored in calculationLogicJson.
Frequently asked questions
What does the Wiper Blade Size calculator tell me?
It returns wiper blade lengths from the measurements entered on this page. The calculation is specific to wiper blade size, so the result should be compared with the exact product or specification you are considering.
Which measurements should I take for wiper blade size?
Measure measured/oem driver blade length, measured/oem passenger blade length, rear blade length. Use clear, usable dimensions rather than nominal room or product labels.
Should I round the wiper blade lengths?
Keep the calculated value for comparison, then choose a real product that meets or stays within the returned wiper blade lengths while allowing for the clearances, tolerances or ratings shown by its manufacturer.