How to Measure Your Car for the Perfect Sunshade

One of the most common mistakes people make when purchasing car sunshades is guessing at the size they need. A sunshade that's too small leaves exposed areas where heat pours in, while one that's too large becomes unwieldy and may not stay in place properly. Taking accurate measurements before you shop ensures you get a product that provides maximum protection and fits your vehicle perfectly.

This guide will walk you through the measurement process for windscreens, side windows, and rear windows. With just a tape measure and a few minutes of your time, you'll have all the information needed to choose the right sunshade for your vehicle.

What You'll Need

Before you begin, gather these simple tools:

• A flexible tape measure (at least 2 metres long)
• A notepad and pen to record measurements
• Optionally, a helper to hold one end of the tape measure

Flexible fabric tape measures work best as they can conform to curved glass surfaces. If you only have a rigid tape measure, you can still get reasonably accurate measurements, but be aware that curved surfaces may require some estimation.

Measuring Your Windscreen

The windscreen is typically the most important measurement since it's the primary source of heat gain in a parked vehicle. Windscreen sunshades come in various sizes, typically ranging from 130cm to 180cm in width, so accurate measurement is essential.

Step 1: Measure the Width

Standing outside your vehicle, measure the widest point of your windscreen from the inside edges of the rubber seal. For most vehicles, this is approximately two-thirds of the way up the glass. Don't measure at the very top or bottom, as windscreens typically taper at these points.

Step 2: Measure the Height

Measure from the bottom of the visible glass (just above the dashboard) to the top of the visible glass (just below the rearview mirror mount or the top edge of the tinted band). Take this measurement at the centre of the windscreen where it's typically tallest.

Step 3: Note Any Obstructions

Modern vehicles often have sensors, cameras, or other devices mounted behind the windscreen. Note the location and size of these obstructions, as some sunshades are designed to accommodate them while others may interfere with their operation.

Measuring Side Windows

Side window measurements are important for choosing static cling shades, magnetic shades, or mesh sun shields. Different windows on the same vehicle often require different sized shades.

Front Side Windows

These windows typically have an irregular shape due to the door frame and mirror mounting. Measure the maximum width and height of the glass area. Note that many side window shades are designed for rear passenger windows only, as front windows need to remain visible for driver safety.

Rear Side Windows

Measure each rear window separately—they're often different sizes, especially if your vehicle has a third row. Record both the width at the widest point and the height at the tallest point. For magnetic shades that attach to the door frame, also note the width of the metal door frame surrounding the window.

Quarter Windows

Many SUVs and wagons have small fixed quarter windows behind the rear doors. These are often overlooked but can let in significant amounts of heat. Measure these separately if you want complete side coverage.

Measuring the Rear Window

Rear window sunshades help prevent heat from entering through the back of your vehicle and protect items in the cargo area from sun damage. The measurement process is similar to the windscreen.

Width and Height

Measure the widest and tallest points of the visible rear glass. Be sure to account for brake lights, defogger grids, and wiper motors that may affect shade placement. Some vehicles have significantly curved rear windows that require flexible shade designs.

Understanding Size Tolerances

When matching your measurements to available sunshade sizes, understanding tolerances helps you make the best choice. Most quality sunshades have some flexibility in how they fit.

Slightly Larger is Usually Better

If you're between sizes, choose the larger option. A sunshade that's slightly too large can be tucked around the edges or compressed slightly, while one that's too small will always leave gaps that let heat in.

Universal vs. Custom Fit

Universal sunshades are designed to fit a range of vehicles within a size category. They're affordable and widely available but may not provide perfect coverage. Custom-fit shades are designed for specific vehicle makes and models, offering precise coverage but at a higher price point.

For most drivers, a properly sized universal shade provides excellent protection. Custom-fit options make sense for unusual window shapes, premium vehicles, or drivers who want the cleanest possible look.

Recording and Using Your Measurements

Keep a record of all your measurements for future reference. This information is valuable not just for sunshades but also for window tinting, privacy screens, and other window accessories. Include your vehicle's year, make, and model alongside the measurements.

When shopping online, compare your measurements to the product dimensions listed. Remember that manufacturers measure their products differently—some list the total shade dimensions while others specify the recommended window size. When in doubt, contact the seller or check customer reviews from owners of similar vehicles.

Special Considerations

Vehicles with Sensors and Cameras

Modern vehicles increasingly feature forward-facing cameras, rain sensors, and other devices mounted behind the windscreen. These typically sit in the area covered by the manufacturer's tinted band at the top of the windscreen. Most sunshades are designed with cutouts or flexible areas to accommodate these devices, but verify compatibility before purchasing.

Panoramic Sunroofs

If your vehicle has a panoramic glass roof, consider this as an additional area requiring sun protection. Measure the visible glass portion and look for roof-specific sunshades or consider aftermarket roof tinting for permanent protection.

Commercial and Oversized Vehicles

Utes, vans, and commercial vehicles often have windscreens significantly larger than standard passenger cars. Always measure rather than assuming—many drivers are surprised to find their vehicle requires jumbo-sized shades.