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How to Measure Your Car's Cargo Space

If you are standing in a parking lot trying to figure out if a desk or TV box will fit inside your trunk, manufacturer specifications in cubic feet are almost entirely useless.

What you actually need are linear dimensions (length, width, and height in inches).

Here is our step-by-step guide to measuring your vehicle's cargo space the right way.


🛠️ What You Will Need

  • A standard metal tape measure (12 to 25 feet).
  • A phone or pad to write the numbers down.
  • 10 minutes of time.

The 4 Vital Measurements to Take

1. Cargo Length with Rear Seats Up

Open your hatch, trunk, or tailgate. With all passenger seats in their normal, upright locked positions:
  • Measure from the back of the rear seat backing to the inside lip of the tailgate or hatch opening.
  • Important: Measure along the floor, not diagonally. This represents the space available when carrying passengers.

2. Max Cargo Length with Seats Down

Fold your rear seats as flat as they will go:
  • Measure from the back of the front seat backs (driver/passenger seats adjusted to your normal driving position) all the way to the tailgate opening.
  • This represents your absolute maximum floor length for hauling furniture, mattresses, or lumber.

3. Cargo Width at the Narrowest Point (The Loading Gate)

This is where most people make mistakes. Do not measure the widest part of the interior.
  • Measure the narrowest point of the rear hatch opening. This is usually the bottom threshold where the hatch latch is, or the space between the rear wheel wells inside the trunk.
  • If your item is wider than this threshold, it will fail to load even if the interior cabin is wider.

4. Cargo Height at the Opening

  • Measure from the cargo floor straight up to the lowest point of the headliner, trunk lip, or weather stripping at the rear opening.
  • Pro Tip: SUVs often have a lower opening height due to the rear spoiler or hatch hinge. Measure the opening clearance first, then measure the interior ceiling height. The smaller of the two is your maximum height constraint.

🚫 Common Mistakes to Avoid

  • Diagonals: Do not measure cargo length diagonally. Unless your cargo is a single pole or pole-like box, a diagonal measurement will cause you to buy items that are too long to fit.
  • Seat Back Slant: Most seats fold at a slight angle rather than 100% flat. Measure the lowest height along the folded seat slope to make sure boxes will not scrape the roof.
  • Wheel Well Intrusions: Crossover SUVs have plastic interior panels surrounding the rear wheels. Always measure the horizontal distance *between* these panels.