Why is diesel the sailboat default?

Most auxiliary cruisers in this size use a small diesel. Switch to gasoline if that is what is in the boat.

Does the calculator include slip waitlists or mooring balls?

No. It prices a wet slip from length and a state per-foot assumption, or your override. A mooring or club launch needs your number.

What costs are included in the all-in monthly number?

Loan principal and interest (unless the boat is paid for), insurance, slip or trailer storage, winterization in cold states, registration, estimated fuel, and maintenance. Most of this bill shows up whether you launch or not.

What if the boat is paid for?

Choose Paid for — no loan. Principal and interest drop to zero. Insurance, storage, fuel, and maintenance still count. Buy vs rent treats the purchase price as cash paid up front.

Is the loan rate a real quote?

No. The default APR is an illustration rate, not a lender quote. Enter the rate on an offer you actually have.

How is fuel burn estimated?

Gasoline uses 0.50 lb/hp-hr specific fuel consumption and 6.2 lb/gal fuel weight. Diesel uses 0.40 and 6.9. Cruise gallons per hour is wide-open-throttle burn times a load factor (default 65%). This is an SFC estimate, not a sea trial.

What does year-5 underwater mean?

If the remaining loan balance after five years is higher than the depreciated boat value (15% the first year, then 10% per year), the loan is underwater in this model.

Estimate sailboat ownership cost in Illinois

Sailboats trade horsepower for marina time. The engine is small; the slip, bottom, and standing rigging are not.

Illinois boaters split between Lake Michigan (Chicago and the north shore) and a large inland-river and reservoir system. Great Lakes weather and winter ice make this a cold-climate storage state in the model. A Chicago wet slip and a downstate trailer are different bills.

Calculator defaults on this page are planning inputs, not a survey of Illinois asking prices or marina invoices. Replace them with your listing and quotes.

BoatTypePrice$LengthftHorsepower (each)hpEnginesFuel

How you payLoanDown payment$APR%Illustration rate, not a quote.Termyrs

Where you keep itStateStorage

How you use itHours per yearOutings per yearZero outings still shows the bill. Most of it shows up whether you launch or not.Cruise load factorInsurance override (annual)$Blank uses the estimate. Any number, including 0, wins.Slip / storage override (annual)$Maintenance override (annual)$

All-in monthly

$1,439

Estimate based on the planning inputs above, not a quote. Your actual costs will vary.

$959 per outing

Most of this bill shows up whether you launch or not.

Fixed

$14,548/yr

$1,212/mo

Variable

$2,720/yr

Fuel + maintenance

Year-5 equity

Estimated value $47,403 vs loan balance $40,932.

Principal & interest	$10,030/yr
Insurance	$1,020/yr
Slip / storage	$2,880/yr
Winterization	$590/yr
Registration	$28/yr
Fuel	$170/yr
Maintenance	$2,550/yr
Annual total	$17,268/yr

Cruise burn 1.1 gph at $3.75/gal. SFC estimate, not a sea trial.

Results travel with the URL.

Compare own vs rent vs club →Trip fuel calculator →

All-in $1,439/mo · $959 per outing

What makes a sailboat expensive to keep

A cruising sailboat in this calculator is a 30-foot auxiliary with a small diesel, wet storage, and a lower insurance and maintenance percent than a center console. The purchase-price default is a planning input. A 1970s coastal cruiser and a new 30-footer are not the same market.

Fuel is the quiet line if you actually sail. It is not free if you motor every Sunday on a schedule. The diesel SFC constants are lower than gasoline, and 30 horsepower is not 300. Do not use that as permission to ignore the slip. Wet storage billed by the foot is why a modest sailboat can outspend a trailered bowrider.

This model does not itemize standing rigging, sails, or bottom paint. Those belong in the maintenance override when you have yard quotes. Winterization still applies in cold states. Insurance uses the same lower factor as pontoons unless you override it.

Slip and months in the water. This is usually the dominant fixed line after the loan.
Yard work. Paint, rigging, and sails are lumpy. Use the override rather than trusting a smooth 3% forever.
Engine hours vs sailing hours. The fuel control is still hours times diesel SFC. If you motor, say so.
State moorage markets. Coastal high-slip states in this model (including Florida, California, New York, Massachusetts, Maryland, Washington, and New Jersey) change the sailboat bill more than they change a trailered pontoon.

Illinois rules that change the bill

Agency. Illinois Department of Natural Resources. Official page: https://dnr.illinois.gov/boating/howtoregister.html.

Registration and titling. Titles vessels. Illinois titles and registers watercraft through IDNR. Illinois watercraft registration and titling run through the Department of Natural Resources, not the Secretary of State car counter. Confirm current forms on the IDNR watercraft pages.

Sales or use tax (general). Illinois has a statewide sales tax plus local taxes. Boat purchases are generally taxable. Confirm with the Illinois Department of Revenue.

Boating education. Operator-age and education rules are state-specific and change. Read Illinois Department of Natural Resources rather than assuming a neighboring state's card is enough.

Water and climate in this model. Illinois boaters split between Lake Michigan (Chicago and the north shore) and a large inland-river and reservoir system. Great Lakes weather and winter ice make this a cold-climate storage state in the model. A Chicago wet slip and a downstate trailer are different bills. This calculator adds a winterization line in cold states. Months-in-the-water and slip-rate defaults are planning assumptions, not a marina rate sheet.

Sources. Illinois DNR how to register a boat · California DMV out-of-state vessel registration/titling agencies · NASBLA state boating contacts

Calculators and related pages

Other boats in Illinois

Same sailboat, other states

Questions

Who registers a boat in Illinois?: Illinois Department of Natural Resources is the agency to start with. Illinois watercraft registration and titling run through the Department of Natural Resources, not the Secretary of State car counter. Confirm current forms on the IDNR watercraft pages.
Does Illinois charge sales or use tax on boats?: Illinois has a statewide sales tax plus local taxes. Boat purchases are generally taxable. Confirm with the Illinois Department of Revenue.
Why is diesel the sailboat default?: Most auxiliary cruisers in this size use a small diesel. Switch to gasoline if that is what is in the boat.
Does the calculator include slip waitlists or mooring balls?: No. It prices a wet slip from length and a state per-foot assumption, or your override. A mooring or club launch needs your number.
What costs are included in the all-in monthly number?: Loan principal and interest (unless the boat is paid for), insurance, slip or trailer storage, winterization in cold states, registration, estimated fuel, and maintenance. Most of this bill shows up whether you launch or not.
What if the boat is paid for?: Choose Paid for — no loan. Principal and interest drop to zero. Insurance, storage, fuel, and maintenance still count. Buy vs rent treats the purchase price as cash paid up front.
Is the loan rate a real quote?: No. The default APR is an illustration rate, not a lender quote. Enter the rate on an offer you actually have.
How is fuel burn estimated?: Gasoline uses 0.50 lb/hp-hr specific fuel consumption and 6.2 lb/gal fuel weight. Diesel uses 0.40 and 6.9. Cruise gallons per hour is wide-open-throttle burn times a load factor (default 65%). This is an SFC estimate, not a sea trial.
What does year-5 underwater mean?: If the remaining loan balance after five years is higher than the depreciated boat value (15% the first year, then 10% per year), the loan is underwater in this model.