How to Measure Your Boat for a Cover
The two measurements that matter, the mistakes to avoid — and why, for most boats, you won’t need a tape measure at all.
If we already pattern your exact boat, you don’t measure anything — just pick your make, model, and year. You only need to measure if your model isn’t in our system or you’re sizing a universal (off-the-shelf) cover. Either way, the two numbers that matter are centerline length and beam width.
First: do you even need to measure?
Perfect Fit covers are custom-patterned to your exact make, model, and year, so for the boats we already cover there’s no measuring at all. You find your boat, answer a few questions about how it’s set up (top style, motors, accessories), and the cover is cut from a master pattern. You’d only break out a tape measure if your exact model isn’t listed yet (call us — we may have the pattern or can make one) or if you’re shopping a generic universal cover elsewhere.
The two measurements that matter
1. Centerline length
Measure in a straight, flat, horizontal line from the tip of the bow to the center of the transom (stern) — keep the tape level, don’t follow the curve of the hull or go up and over the windshield and seats.
2. Beam width
Measure the widest point of the boat, straight across in a flat horizontal line (usually around the windshield/console area) — again, don’t follow the hull’s contour.
Your top changes the pattern — not just the size
Two numbers size a cover, but the structure on top of your boat changes its whole shape. A walk-through windshield, a hardtop, a wake tower or arch, and especially a T-top each need a cover cut for that specific superstructure — you can’t drape a flat-deck cover over a T-top. That’s why our product pages ask you to pick your configuration (top style, console, aft bars). T-top boats in particular split into a T-top cover (covers the boat, frame stays exposed), a center console cover, and a T-top shade kit — see our Boat Cover Buyer’s Guide for which is which.
Custom vs. semi-custom vs. universal
| Type | How it’s sized | Fit & lifespan |
|---|---|---|
| Universal (“box”) | Length range + beam, by hull category | Loosest fit, shortest life; cheapest. Must be snugged with a drawcord and straps. |
| Semi-custom (styled-to-fit) | Patterned to a hull style shared across brands | Good balance of fit, cost, and availability. |
| Custom-patterned (what we make) | Engineered to your exact make/model/year + options | Tightest fit, easiest on/off, best for trailering, longest-lasting. |
Common measuring mistakes
- Measuring over the windshield, rails, or seats instead of straight across — this inflates your numbers.
- Including the outboard motor in the length — the cover will be too long.
- Forgetting the bow pulpit, swim platform, bracket, or ladder — the cover comes up short.
- Buying too tight (seams and hems rip under load) or too loose (it sags, pools water, balloons in wind, and flaps).
Frequently asked questions
Do I include the motor in the length?
No. Measure bow to the center of the transom; the cover stops at the stern, not the engine.
Do I measure over the windshield?
No — measure in a straight, flat line. Going over the glass or seats overstates the size.
Do I really not need to measure for your covers?
Correct — if we pattern your boat, just select your make, model, and year. Measuring is only for unlisted models or universal covers.
What if my exact model isn’t listed?
Call (561) 677-2628. We likely have the pattern or can create one for your boat.
Keep reading
Skip the tape measure — find your boat.
If we pattern your model, ordering takes about two minutes and no measuring.