Marina Slip Rental Pricing Calculator

How this calculator works

Wet-slip rental is the foundation revenue line for almost every full-service marina. The standard US convention prices slips at a per-foot per-month rate, scaled by a length-tier multiplier ladder so that larger slips carry a per-foot premium over the base rate. The calculator accepts a per-tier inventory (slip count plus average length-overall), a base per-foot rate set against the reference 26-35 ft tier, a transient vs annual blend with a transient premium multiplier, and two ancillary revenue lines — fuel-dock margin allocated per slip and electric kWh pass-through with an optional markup. It returns the monthly slip revenue, the monthly ancillary revenue, the total monthly revenue, the 12-month annual projection, and the per-slip RevPAR figure that benchmarks the marina against Marina Dock Age industry data.

The five length tiers and the multiplier ladder follow the Association of Marina Industries (AMI) member-survey banding. The tier boundaries — 25, 35, 45, and 65 feet — match the breakpoints at which shore-power amperage, dock loading, and slip footprint step up in the standard US marina cost stack. The default multipliers (0.85x for under 25 ft, 1.00x for 26-35 ft as the reference, 1.10x for 36-45 ft, 1.25x for 46-65 ft, 1.45x for 66 ft and up) reflect AMI median calibration. Markets with unusually heavy or unusually light large-yacht demand can diverge from these multipliers, but they are a defensible starting point for any US full-service marina.

This is an operating diagnostic. It is not professional advice. For consequential decisions on rate-card changes, multi-year contract pricing, or marina acquisition underwriting, consult a marina-industry consultant or a licensed CPA familiar with marina operator economics.

The per-foot per-month convention

US marinas have converged on per-foot per-month pricing for two reasons. First, the marina cost stack scales primarily with slip footprint rather than slip count. Dock construction cost, dredge maintenance, bulkhead replacement reserve, freshwater service, and shore-power service all scale with the linear feet of dock face the marina maintains. Pricing per foot of slip aligns the revenue line with the underlying cost driver. Second, the convention is portable across markets: a boater comparing two marinas can normalize the rates to a per-foot basis and compare directly, even if the absolute rates differ. The convention has been the AMI member-survey reporting standard for decades.

Per-foot rates are typically quoted as a single number for the annual contract — the standard 12-month commitment — and the marina derives the transient nightly rate from the annual rate plus a premium. The reference tier (the rate that drives the rest of the rate card) is the 26-35 ft band, because that band captures the largest share of US recreational boats by registered count and the bulk of full-service marina slip inventory. Smaller slips (under 25 ft) discount against the reference rate because shore-power load is lighter and dock loading is minimal; larger slips price up because they consume more dock infrastructure and require higher-amperage shore-power service.

The current US-wide median per-foot per-month rate for the 26-35 ft reference tier runs in the $15 to $25 range, with regional variation from roughly $10 in low-cost southern markets to $40-plus in premium northeast and west-coast markets. Destination markets (Florida Keys, Bay Area, Newport, Annapolis) can run substantially higher. Pull the most recent AMI member-survey regional summary or the Marina Dock Age annual industry report to calibrate the rate for your specific market.

Length-tier multipliers

The per-foot rate does not stay flat across the rate card; it scales with length. Three components drive the per-foot premium on larger slips:

Shore-power amperage steps. Boats under roughly 40 ft typically run on a single 30-amp shore-power circuit; 40-60 ft boats step up to 50-amp; 60 ft and over commonly require dual 50-amp or single 100-amp service, sometimes 3-phase. The dock electrical infrastructure required to serve the larger-amperage slips is materially more expensive on a per-slip basis — heavier copper, larger pedestal hardware, more sophisticated metering, and more frequent transformer upgrades on the marina-side service.

Dock loading. Boat displacement (weight) grows roughly with the cube of length: a 60-ft boat displaces something like 8x the mass of a 30-ft boat. The dock structure required to support the larger boats — pile diameter, beam depth, decking thickness, floating-dock buoyancy — steps up at the standard length breakpoints, and the marina's dock replacement reserve per slip scales accordingly.

Slip footprint. A 70-ft slip consumes more than twice the dock-face linear feet of a 30-ft slip when fairway width is included, and substantially more than twice the slip-water square footage. Dredging, bulkhead, and dock-replacement capex per slip scale with the slip footprint.

The 0.85x / 1.00x / 1.10x / 1.25x / 1.45x multiplier ladder used as the default in this calculator captures the AMI member-survey median calibration. The under-25 ft tier discounts to 0.85x because the boats are typically transient or use the slip for short windows and the shore-power load is minimal; the 1.45x premium on the 66 ft and up tier captures the materially higher cost-to-serve on a large-yacht slip. Markets with unusual large-yacht demand may run higher multipliers (1.6x or more in destination superyacht markets); markets with thin large-yacht inventory may discount the top tier to reduce vacancy risk.

Transient vs annual blend

Most US marinas operate a blended book: a base of annual contracts at the per-foot per-month rate, plus transient revenue from boats moving through the marina on overnight or weekly stays. The transient share varies dramatically by marina type:

• A pure annual-contract marina in a residential coastal community may run 0% transient — every slip is on a 12-month commitment with the same tenant year after year.
• A typical destination marina on a popular cruising route (Intracoastal Waterway, Great Loop, San Juan Islands, Florida Keys) may run 15-30% transient.
• A pure transient marina at a high-traffic destination (a marina at the entrance to a popular harbor with no annual contracts) runs 100% transient.

The transient rate is typically priced at a premium to the annual per-foot rate normalized to a nightly basis. The convention is to take the annual per-foot per-month rate, divide by 30 days to get an equivalent nightly per-foot rate, and multiply by a premium factor of 1.5x to 3x. A 2.0x multiplier is a defensible default for a marina with mixed transient/annual book; popular destination marinas during peak cruising season can sustain 2.5x to 3.0x; off-season transient rates may come back to 1.5x.

The calculator surfaces the blend by accepting the transient share of slip-nights and the premium multiplier, then computing the effective per-foot rate as a weighted average of the annual rate and the transient rate. The resulting figure is the per-foot rate the marina actually realizes on average across the inventory. For sensitivity analysis, run the calculator at transient shares of 0%, 15%, and 30% and at multipliers of 1.5x, 2.0x, and 2.5x to bracket the realistic revenue band.

Ancillary revenue lines

The slip rate alone understates the per-slip revenue captured by a well-run marina. Two ancillary lines almost always travel with the slip contract and the calculator surfaces both:

Fuel-dock margin per slip. Slip tenants are the primary fueling base for almost every fuel-active marina. The marina captures a per-gallon margin on gasoline and diesel sales (modeled in detail in the companion marina-fuel-margin-calculator) and the bulk of the gallons sold are sold to slip tenants. A typical fuel-active marina captures $50 to $200 in fuel margin per slip per month, depending on the mix of cruisers (who fuel less frequently) and sport-fish/center-console boats (which fuel heavily during the season). Some operators carry the fuel revenue as a separate line in the P&L; others allocate the margin to the slip-revenue projection because the relationship is economically attached to the slip contract. Either convention is defensible — the calculator accepts the allocated figure and surfaces it as a separate ancillary line for clarity.

Electric kWh pass-through. Most US marinas meter or sub-meter shore power per slip and pass the utility cost through to tenants. The pass-through structure varies: some marinas pass at cost (zero markup, electric is a true pass-through); some apply a 10-15% markup to recover meter-reading and billing administrative cost; a few apply a 20-30% markup as a profit center, though that practice is increasingly difficult to defend in tenant negotiations. The calculator accepts the per-slip monthly kWh consumption, the marina-side utility cost per kWh, and the markup percentage, and computes the per-slip electric revenue captured by the marina. For a 50-slip marina with 350 kWh per slip per month at a $0.13 utility cost and a 10% markup, the calculator surfaces $227 per month in electric markup revenue — small but real.

RevPAR — revenue per available slip

RevPAR is the marina-industry analog of the hotel RevPAR metric. It is computed as total revenue divided by total slip inventory, on a monthly or annual basis, and is the cleanest cross-marina benchmark for operator economics. The calculator reports the monthly RevPAR figure including slip and ancillary revenue; for slip-only RevPAR, the operator can divide the monthly slip-rate revenue line by the total slip count.

US median annual RevPAR for full-service marinas typically runs in the $5,000 to $15,000 per slip range, with regional variation. Lower-cost southern markets and seasonal northern markets sit at the low end; premium northeast and west-coast markets sit at the high end; destination markets (Florida Keys, Annapolis, Newport, Bay Area, San Diego) and luxury large-yacht marinas can run well above $20,000 per slip per year. Marina Dock Age publishes annual industry RevPAR data; AMI member-survey data covers the same ground with more regional granularity for members.

The RevPAR figure is most useful as a year-over-year operator benchmark and as an acquisition-underwriting input. For a single-marina pricing decision, the per-foot rate-card view in the calculator is the more directly actionable diagnostic — RevPAR captures the realized outcome but does not surface the levers (rate, mix, ancillary capture) that move it.

What the calculator does not cover

This calculator covers wet-slip rental only. Several related marina revenue lines are addressed in companion calculators or are out of scope:

• Dry stack and trailer storage: separate pricing models with different cost stacks. Dry stack typically prices at 60-80% of the wet-slip per-foot rate; trailer storage is typically a flat monthly rate by trailer footprint.
• Haul-out and on-land storage: priced on a different convention (per-foot haul-out fee plus per-foot per-month storage rate) and modeled in the companion marina-haul-out-pricing-calculator.
• Fuel-dock detailed margin analysis: per-gallon margin mechanics, daily/monthly/annual gallons, breakeven analysis, and the EPA SPCC environmental compliance trigger are modeled in the companion marina-fuel-margin-calculator.
• Environmental compliance cost: Clean Marina certification, SPCC plan maintenance, NPDES stormwater permits, and marine sanitation device pump-out compliance costs are modeled in the companion marina-environmental-compliance-cost-calculator.
• Slip sales (vs rental): dockominium and slip-fee-simple ownership models price differently and are not modeled.
• Lift, mast-stepping, and service revenue: rigging, paint, and engine service revenue lines are not modeled. These are typically a separate marine-service P&L.