People shop boats by length because length is printed on the transom. Money does not scale that cleanly. A 19-foot bowrider and a 29-foot cabin cruiser are different products: parking, engines, and systems, not “ten more feet.”
BoatCost never bills the loan by the foot. It bills price. It bills length for wet slips, dry stack, and the winterization stub. It bills horsepower and engines for fuel. This guide walks those levers with example calculator inputs. It is not a sold-boat index and not a marina survey.
Use the ownership calculator and change one lever at a time.
What length actually does in this model
- Wet slip ≈
length × slipPerFtMonth × monthsInWater - Dry stack ≈
length × dryPerFtMonth × 12 - Winterization (cold states) ≈
350 + 8 × length - Trailer mode does not scale with length in the default dollar line (still $250 or $500)
A 22-foot boat in a $32/ft/month Florida-style wet slip for 12 months is about $8,448 of parking in the formula. A 32-foot boat at the same rate is about $12,288. Same state, same rate, ten feet, thousands of dollars — planning math, not a quote.
If you trailer both boats, that parking gap collapses in the model. The real world may still charge you a bigger truck.
Size bands with example inputs
These bands use this site’s type defaults as a starting point. Overwrite them.
Personal watercraft (~11 feet)
- Default price $16,000, 110 hp, trailer
- Insurance and maintenance percents are the high ones
- Slip formulas rarely matter unless a marina bills a PWC dock — override
- See PWC in Nevada
Trailering runabouts and pontoons (~18–24 feet)
- Bowrider default $55,000, 20 ft, 200 hp, trailer
- Pontoon default $45,000, 22 ft, 150 hp, trailer
- Length starts to matter if you switch to wet
- See first boat budget
Bay and small consoles (~20–26 feet)
- Bay boat default $65,000, 22 ft, 150 hp, trailer
- Center console default $120,000, 25 ft, 300 hp, wet
- The console jump is price + hours + parking, not three feet of fiberglass
- See center console in North Carolina vs bay boat in North Carolina
Small cruisers and 30-foot sail (~28–34 feet)
- Sail default $85,000, 30 ft, 30 hp diesel, wet
- Cabin cruiser default $220,000, 32 ft, twin 300 hp, wet
- Fuel on the cruiser is a different sport than the sail auxiliary
- Slip on both is a length product
- See cabin cruiser in New York and sailboat in Rhode Island
Notice the sailboat can have a modest engine bill and a large parking bill. The cruiser can have both.
Horsepower is not length
A 22-foot tritoon with 300 hp uses console-like fuel math. A 30-foot sailboat with 30 hp does not. If you compare “cost per foot” across those two you will write nonsense.
Always set engines. Twins double SFC burn. That is why cabin-cruiser defaults are twins. See how to estimate GPH.
Systems grow faster than LOA
Heads, air-conditioning, generators, and electronics cluster on boats that also happen to be longer. The maintenance percent jumps by type, not by each extra foot. A loaded 24-foot console can out-maintain a plain 24-foot bay boat. Use the override when the listing is a floating store.
Insurance planning percents also follow type, then a state multiplier. Length is a question on the application; it is not a separate calculator row. See insurance cost factors.
Cost per outing vs size
A larger boat that you use 40 days can beat a smaller boat you use 6 days on cost per outing. The larger boat still wins the annual cash contest. Decide which question you are asking.
Buy vs rent is how you test whether size you will not use should be a club’s problem.
Crew, payload, and the size you feel
A boat that is “big enough” on a flat lake can be small in a three-foot chop with six adults. That comfort argument is real and not in the spreadsheet. The reverse is also real: a larger cabin you cannot park becomes a very expensive guest room. Size the mission, then size the parking. If the mission is two people and a dog on a reservoir, a 32-foot default cruiser is a type sample, not a recommendation.
How to compare two lengths fairly
- Pick the same state and storage mode.
- Enter each listing’s price, length, horsepower, and engines.
- Use the marina’s billed length if it differs from marketing LOA.
- Keep hours honest for each mission (the 32-footer may not run 80 fishing hours).
- Read all-in monthly and cost per outing.
Related:
- True cost of boat ownership
- Boat loan vs total monthly cost
- Wet slip vs trailer
- Maintenance schedule
Pros and cons of shopping by length
Pros
- Easy to filter listings
- Slips and covers are often sold by the foot
- Safety and comfort in a chop sometimes do track size
Cons
- Hides twins and systems
- Invites “just a little more boat”
- Makes trailered vs slipped comparisons look like a length problem
Bridges, covers, and the size the world allows
Air draft and beam can make a “perfect” 33-footer illegal for your covered slip or unable to reach your lake house. Those constraints do not appear as errors in the calculator. Measure the door, the bridge, and the trailer storage before you fall in love with LOA. A 24-foot boat you can house is cheaper than a 31-foot boat that lives on a waiting list. See dry stack contracts.
Who this is for
- Shoppers jumping from 20 to 28 feet
- Couples arguing pontoon vs mini-cruiser
- Anyone citing “dollars per foot” from a forum
If two listings are the same length and very different money, believe the systems and the engines, not the transom number. Run both through the ownership page with identical hours and storage. The expensive one should have a reason you can point at — twins, cabin, or a slip — or you are paying for a logo. Save both share links and send them to the other decision-maker before anyone falls in love at the rail.
Alternatives
- Compare two saved share links
- Charter the larger size for a week (a rental pile)
- Stay under 26 feet until a slip exists on paper
FAQ
Why doesn’t trailer cost grow with length? The default is a small stand-in. A triple-axle trailer loan is extra — add it to price or remember it.
Is 30 feet the club cutoff? No. Clubs and rentals have their own fleets. Enter their dues.
Do state pages change the size math? They change slip rates, months in the water, fuel defaults, and insurance multipliers. The formulas stay the same.