Fleet ROI Calculator
Monthly revenue, operating cost and payback for a rental fleet — with the three scenarios we publish and every assumption left editable.
The arithmetic of a rental fleet is short enough to write out in full: boats multiplied by the rate you collect, multiplied by the days you open, multiplied by the sessions each boat sells. The part that decides the answer is not the formula but the numbers you put into it.
This calculator exposes all seven. Start from one of the three scenarios we publish, then replace every one of them with what your own venue actually does. The seventh — fixed monthly costs — is where the venue lease, salaried staff and insurance enter; the scenarios carry it as zero, because no single number fits every venue. Each scenario is a single set of published assumptions, and the note under the table says which set this page runs, because two published sets of neutral assumptions exist and they are not interchangeable.
What comes out is a scenario estimate — not a forecast, not a promise. It excludes financing and major maintenance; the venue lease, salaried staff and insurance enter through the fixed-cost field rather than as a share of revenue. It assumes the boats you buy are the boats you run. Our published 15-boat venue case predates the fleet-efficiency factor below and runs the six-variable core across a 200-day tropical season, a 150-day season and a 100-day season, and the calendar moves the answer further than the fleet does.
Three scenarios, not one promise
Each column is a published set of assumptions. The right answer for a venue is whichever column matches your season and your pricing — and the calculator lets you replace all of it.
| Assumption | ConservativeShort season, shoulder pricing, low utilization | NeutralBalanced season and pricing, steady utilization | OptimisticPeak season, premium pricing, high utilization |
|---|---|---|---|
| Boats | 6 | 6 | 6 |
| Cost per boat | $5,000 | $5,000 | $5,000 |
| Revenue per booking | $30 | $40 | $55 |
| Operating days / month | 12 | 24 | 30 |
| Bookings per boat per day | 1.5 | 3 | 5 |
| Operating cost share | 35% | 25% | 20% |
| Monthly revenue | $3,240 | $17,280 | $49,500 |
| Monthly contribution | $2,106 | $12,960 | $39,600 |
| Payback | 14 mo | 2.3 mo | 0.8 mo |
The three scenarios on this page are the set our rental calculator uses: conservative at a $30 rate over 12 operating days, neutral at $40 over 24 days, optimistic at $55 over 30 days. Our published ROI article runs a different set — a neutral case of $45 over 26 operating days at 4 bookings per boat per day and a 15–25% operating cost share, which is the starting point of the older calculator on this site. Both sets run the same six-variable core plus the optional fixed-cost field, but they are not the same numbers and they are not interchangeable. Every figure this page produces uses the set above, and the fixed-cost field starts at zero because no venue-wide number exists.
Run the numbers
Change any of the seven assumptions and every figure below recalculates. Start from a scenario if you want a starting point, or type your own from the first field.
Start from a published scenario
Applying a scenario replaces all seven fields with that scenario’s published assumptions — including resetting fixed monthly costs to zero.
Result
- Monthly revenue
- $17,280
- Monthly operating cost
- $4,320
- Monthly contribution profit
- $12,960
- Monthly net profit
- $12,960
Contribution profit minus fixed monthly costs — the number payback runs on.
Initial equipment investment
$30,000
Payback
2.3 mo
Months of operation to recover the equipment investment at this month’s net profit (contribution minus fixed costs).
Breakeven
- Breakeven fleet
- —
- Breakeven rides / boat / day
- —
- Payback in open days
- 56
No fixed costs entered, so there is no breakeven fleet to find.
Rides per boat per day that cover the fixed monthly costs at this fleet size — not what recovers the equipment investment.
The payback above counted in days the venue actually opens.
A scenario estimate, not a promise of return. It excludes financing and major maintenance; the venue lease, staff and insurance enter only if you type them into the fixed-cost field.
How the numbers are built
Monthly revenue = boats × revenue per booking × operating days × bookings per boat per day × fleet efficiency. Efficiency is 0.85 for one or two boats, 1 for three to ten, and decays by three quarters of a boat per boat beyond ten — a directional planning assumption, not a published figure.
Monthly operating cost = monthly revenue × operating cost share. Monthly contribution profit = monthly revenue − monthly operating cost. Monthly net profit = contribution profit − fixed monthly costs.
Payback = initial equipment investment ÷ monthly net profit. The equipment investment is the boat count × the cost per boat, and it excludes the venue, the dock and the barrier system.
Breakeven fleet = the smallest fleet whose efficiency-weighted contribution covers the fixed monthly costs. Breakeven rides per boat per day = fixed monthly costs ÷ (efficiency × boats × operating days × net revenue per ride). Both are undefined when there are no fixed costs.
Boarding, briefing and turnaround time are not separate line items — they sit inside the bookings-per-boat-per-day assumption, which is why the three scenarios run well below theoretical capacity. The battery baseline is one charge per night; a mid-day pack swap, where a venue runs one, shows up as fewer sessions per boat rather than as a cost.
What each assumption means
Where a published figure exists we name it. Where nothing is published we say so rather than filling the cell.
| Assumption | What it is | Published range | Where it comes from |
|---|---|---|---|
| Boats in the fleetboats | How many boats run at once, and how many you pay for. | 5–20 for a first venue | Our published 15-boat standard venue runs 15 boats; our procurement guide puts a starter commercial fleet at five to six. |
| Cost per boatUSD | Equipment only, before freight, duties, compliance and dock work. | $2,400–$6,900 per unit at 2026 factory prices | The default here is $5,000 — our current quotation for a mid-tier electric model — inside the published B2B market band from our price guide; the published 15-boat venue case figures roughly $5,000 per boat delivered. |
| Revenue per bookingUSD | What one boat earns in one paid session, net of discounts. | $30 / $40 / $55 across the three scenarios | Net revenue per booking, after group discounts, party deals and off-peak pricing. Our published ROI article runs a different neutral set — $45 over 26 operating days at 4 bookings per boat per day and a 15–25% operating cost share — which is the starting point of the older calculator on this site. The two sets are not interchangeable. |
| Operating days per monthdays | How many days a month the venue actually opens. | 12 / 24 / 30 across the three scenarios | Operating calendars. A tropical venue sits near the top of the range; a temperate or winter-season operation sits at the bottom. The published ROI article’s own neutral case runs 26 days, on the other assumption set. |
| Bookings per boat per daysessions | Paid sessions one boat sells on an open day, net of boarding and turnaround. | 1.5 / 3 / 5 across the three scenarios | Utilisation assumptions. Our operating guide puts 10–30% of theoretical capacity booked in season, with 20% as a reasonable neutral assumption. |
| Operating cost share% of revenue | Electricity, staff and wear, as a share of the revenue above. | 35% / 25% / 20% across the three scenarios | Published operating cost shares for a rental operation, where the boats are the business rather than one attraction among many. The published ROI article quotes a 15–25% band for its own neutral case, on the other assumption set. |
| Fixed monthly costsUSD / month | Venue lease, salaried staff and insurance — the costs that do not scale with the fleet. | Site-specific; the three scenarios publish 0 | Our staffing guide runs 1–2 attendants per 6–8 boats with a manager from 15–20 (US payroll planning guidance); no published venue-lease figure exists across markets, so the field starts at zero and the number is yours. |
What the model leaves out
- Financing costs. A boat bought on a lease costs more per month than the same boat bought outright, and the model does not price that.
- Insurance, unless you type it in. The fixed-cost field is where a public liability and passenger policy belongs; left empty, the model says nothing about it.
- Major maintenance and battery replacement. The operating cost share covers day-to-day running costs.
- Venue construction. Pool or lake construction, dock, barrier system, and the labour to build them are all quoted separately from the fleet; the recurring venue lease belongs in the fixed-cost field.
- Ticket revenue other than the boat. Food, merchandise and secondary attractions are not modelled here.
The same model on a published 15-boat venue
Our published case takes a 15-boat water kart venue with a 634-metre track and an 18-berth floating dock, and runs a fleet investment of roughly $75,000 delivered against three operating calendars. It predates the fleet-efficiency factor above, so it runs the plain six-variable core. In a strong tropical venue running 200+ days a year, the fleet pays back in under two months of operation, and a single 45-day peak window on its own recovers 70–75% of that investment. In a neutral 150-day season, full payback takes three to four months and the same 45-day peak recovers about 30%. In a thin 100-day season, plan on a season or more, with the peak window recovering 20–30%. The boats are rarely the variable that decides which of those three futures you get — the calendar is.
Read the 15-boat venue case →Those three outcomes are one venue’s published scenario, not a range we are promising you.
A scenario estimate, not a promise of return. Actual results depend on your location, season, pricing, utilisation and operating efficiency.
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From calculation to RFQ
Every tool here ends the same way: the numbers you worked out go into the enquiry form with your message, so the first reply quotes against your configuration instead of a generic range.
Start an enquiry with these numbersReady to price a fleet?
Tell us the market, the number of boats and the site. We reply with a configuration and a landed-cost estimate, not a brochure.