High-End Aquarium Design Break-Even: About $54K/Month

Fixed costs $34.5K/mo Year 1 base

Contribution margin 72% After variable costs

Break-even revenue $47.8K/mo Monthly target

Break-even timing Month 2 Early ramp

Break-even calculator

Use this calculator to test monthly revenue against direct costs and fixed overhead.

Lean Base Full

Monthly revenue Revenue is the top line that covers direct costs and then fixed overhead. $ Low sales High sales Variable expenses These are direct costs that rise with each project or service month. $ Low direct High direct

Money available to cover fixed costs $1,269,700 $1,693,000 revenue - $423,300 variable expenses

Margin ratio

75%

Covers fixed costs

Yes

Fixed monthly costs This is the monthly cost base contribution margin has to cover. $ Lean team Heavier team

Break-even chart Revenue Total costs

Which high-end aquarium design expenses are fixed and which move with sales?

Cost classification

Break-even only works if the model separates stable overhead from project-linked spend. In this plan, fixed monthly overhead and payroll set the hurdle, while materials, livestock, vehicle use, and subcontractors move with revenue.

Expense	Cost	Break-Even Treatment	Common Mistake
Quarantine Facility Lease	Fixed	Include $5,000 per month in the fixed overhead base from Month 1 through Month 60.	Treating the lease as project spend and understating the monthly sales hurdle.
Year 1 Operating Payroll	Fixed	Include $25,000 per month for the first operating year before calculating break-even revenue.	Leaving payroll out because the owner is active in delivery.
Insurance General Liability	Fixed	Include $1,500 per month as recurring overhead that does not rise with each aquarium project.	Spreading insurance only across closed jobs instead of carrying it every month.
Custom Tanks & Equipment	Variable	Model as 15% of first-year revenue because this spend rises with design and install volume.	Using a flat monthly allowance and missing margin pressure on larger builds.
Exotic Livestock & Consumables	Variable	Model as 6% of first-year revenue, tied to livestock, supplies, and client consumption.	Classifying consumables as overhead and overstating contribution margin.
Specialized Vehicle Operating Costs	Variable	Model as 3% of first-year revenue since travel, delivery, and service usage rise with job volume.	Treating vans as one fixed line and ignoring usage-linked operating spend.
Project-Specific Subcontractors	Variable	Model as 4% of first-year revenue when outside labor is tied to individual installations.	Rolling subcontractors into payroll and hiding true project margin.
Maintenance Route Labor and Consumables	Semi-variable	Carry a base service load, then increase labor hours and consumables as retained clients grow.	Assuming maintenance is fully fixed after installation instead of tracking retained-client usage.

How do lean, base, and full studio break-even paths change for this aquarium design business?

Scenario table

Break-even moves faster as project revenue rises and fixed overhead gets spread over more installs, but the full build also adds staff and operating load, so cushion depends on deposits, retention, and install timing.

Planning assumptions only; actual break-even will move with signed work, timing, and crew load.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean launch studio	$677K	$190K	$386K	72%	$101K	Near break-even, so timing risk stays real.
Base scaling studio	$2,146K	$537K	$599K	75%	$1,011K	Wide cushion if deposits and installs stay on schedule.
Full studio build	$4,280K	$942K	$749K	78%	$2,589K	Strong cushion, but crew and scheduling bottlenecks still matter.

What breaks the break-even plan if sales slow, overhead climbs, or project margins slip?

Stress test

The base case has about $677,000 of monthly revenue against a $536,111 break-even, so the cushion is roughly $140,889. Still, the model is sensitive if installs slow, fixed overhead rises, or the 72% contribution margin slips.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change.	$536,111	$140,889 cushion	The plan clears break-even, but not by a huge margin.
Revenue shortfall	Monthly revenue runs 10% below plan.	$536,111	$73,189 cushion	The buffer is still positive, but it shrinks fast.
Fixed-cost pressure	Monthly overhead rises by $5,000.	$543,056	$133,944 cushion	Each extra $5,000 needs about $6,944 more revenue.
Margin pressure	Variable load rises 1 point, cutting contribution margin to 71%.	$543,662	$133,338 cushion	A small margin leak pushes break-even higher fast.
Combined pressure	Revenue falls 20%, overhead rises $5,000, and contribution margin slips to 71%.	$550,704	$9,104 gap	This is where one weak month can turn into operating loss.

What has to be true before you sign the lease and buy the vans?

Founder checklist

Don’t lock in the facility, vans, or hires until the deposit pipeline can support about $54K a month and you still have enough cash for the $762K minimum in Month 2. The model only works if launch spending stays behind signed work.

1Deposit Pipeline$54K/mo

Verify signed deposits and booked projects can clear this monthly break-even level before you add fixed overhead.

2Fixed Load$34.5K/mo

Confirm your monthly fixed load, including payroll and facility costs, stays near this level before any new lease or headcount.

3Margin Mix72% CM

Check that direct costs stay near 28% of revenue so each job still contributes enough to cover overhead.

4Crew Capacity3.0 FTE

Line up installer and subcontractor capacity before large jobs land, and price maintenance routes against technician hours so service work does not run thin.

5Cash Cushion$762K

Keep this reserve in place through Month 2, when cash bottoms out and the build-out hits before steady revenue does.

6Launch DemandSigned only

Hold hiring until you have signed projects and service contracts, and verify quotes and vendor terms for the $278K launch spend before you commit.