How to Measure Your Boat for a 16 Ft Boat Cover?

Measure the boat’s centerline length and beam width in straight, flat lines to find the right 16 ft boat cover.

Buying a 16 ft boat cover when your boat is actually 16 ft long seems straightforward. “Close enough” is a mistake that sellers and marine organizations warn about constantly. The cover won’t fit, water will pool, and the fabric will stress. Getting the right size starts with two straight-line measurements on the hull itself — not the trailer, not the manufacturer’s brochure — and a quick decision about what you want covered.

What Two Measurements Do You Need?

The two numbers that determine cover fit are centerline length and beam width, both measured on the boat itself in straight, flat lines.

Length: Run the tape from the tip of the bow to the center of the stern or transom, straight through the middle of the boat. Don’t drape the tape up and over windshields, seats, rails, or a bimini top — follow the floor. Pull it level, not tight over the gunnel height.

Width: Measure the widest point of the boat from side to side in a flat, straight line. Again, don’t follow the curve over a windshield or gunwale.

National Boat Covers and Overton’s both stress that these are straight-line measurements; BoatUS echoes that a tape following the boat’s curves gives you a number that doesn’t match any cover size chart.

Which Add-Ons Count Toward Cover Size?

If the cover must fit over something permanently attached, it counts toward your length and width. If it’s removable, it doesn’t.

• Add to the length: swim platforms or steps, bow pulpits, trolling motors, transom brackets, jack plates, ladders, and center consoles when you want the cover to include them.
• Leave out of the width: removable items and bumpers. Most guides also say a motor doesn’t count unless the cover is specifically meant to enclose it.

This single decision is where most sizing errors happen.

Common Sizing Mistakes to Avoid

Measure the actual boat, not the paperwork. Manufacturer’s published lengths often differ from real hulls, and a trailer-mounted measurement includes parts the cover never touches.

• Measuring over the windshield, seats, rails, or bimini instead of in a straight line.
• Measuring from the trailer instead of the boat itself.
• Trusting the boat’s advertised length over the measured centerline length.
• Forgetting fixed add-ons like a swim platform or bow pulpit.

One caution: cover brands don’t all size the same way. Some systems are shape-specific or use their own size calculators rather than simple universal length bands, so check the method for the exact product you’re buying. A cover marketed by size range also tells you the hull style it fits — a V-hull fishing boat cover won’t suit a runabout or center console with a different beam profile. BoatUS’s guide to boat covers explains how hull shape changes fit.

Checked the Fit? Find the Right Cover

Once you have your numbers, you’re ready to shop. A 16 ft cover like the Westland FB16X is sized for boats measuring 15’6″ to 16’5″ long and 96″ wide, and it’s built for V-hull fishing boats — the kind of spec detail that matters more than the “16 ft” label. Match your measured centerline and beam against the product’s range, not the boat’s name.

If you’re ready to buy, our tested roundup of the best 16 ft boat covers compares the top options side by side with real fit notes.