Stump Grinder Rental Break Even: About $110k Monthly Revenue

Fixed costs $12.6K/mo Core overhead

Contribution margin 88.9% After variable costs

Break-even revenue $14.2K/mo Needed each month

Break-even timing Month 6 Model ramp point

Break-even calculator

Use this to test whether monthly revenue clears variable expenses and fixed costs for a stump grinder rental service.

Lean Base Full

Monthly revenue Revenue sets the pool that must cover direct costs and overhead each month. $ Low run rate High run rate Variable expenses These are direct costs that rise with each rental or job. $ Light cost Heavy cost

Money available to cover fixed costs $415,516 $537,833 revenue - $122,317 variable expenses

Margin ratio

77%

Covers fixed costs

Yes

Fixed monthly costs This is the monthly cost base break-even has to absorb. $ Lean overhead Heavy overhead

Break-even chart Revenue Total costs

Which stump grinder rental expenses stay fixed, and which move with sales?

Cost classification

Break-even gets shaky when fixed overhead and per-rental fees are mixed together. Treat fixed items as monthly hurdles, then deduct variable fees from each sale before you count contribution margin.

Expense	Cost	Break-Even Treatment	Common Mistake
Office Rent	Fixed	Cover $4,000 per month before profit.	Treating space as optional at break-even.
Utilities and Internet	Fixed	Include $600 per month in overhead.	Ignoring yard and office connectivity.
Software Licenses and Tools	Fixed	Include $1,500 per month in monthly overhead.	Leaving rental software out of break-even.
Platform Maintenance	Fixed	Cover $2,000 per month during the planning range.	Underfunding upkeep after launch.
Insurance Premiums Base	Fixed	Cover $2,500 per month before owner income.	Confusing base insurance with transaction premiums.
Payment Processor Fees	Variable	Deduct 2.9% of first-year revenue from each sale.	Using gross revenue as margin.
Customer Support per Transaction	Variable	Deduct 4.5% of first-year revenue as orders rise.	Assuming support is free.
Transaction Insurance Premiums	Variable	Deduct 2.5% of first-year revenue tied to volume.	Missing claims exposure in contribution margin.

How does break-even change from a lean launch ramp to a full-utilization stump grinder rental case?

Scenario table

Lean is the tightest case, base is the cleanest steady-state path, and full gives the widest cushion. The swing comes from lower variable load and higher monthly revenue, while fixed costs rise more slowly.

Planning assumptions only; actual break-even will move with rental days, pricing, and downtime.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean launch ramp	$119k	$13k	$71k	88.9%	$35k	Positive monthly profit, but the cushion is still thin if bookings slow.
Base steady demand	$288k	$30k	$91k	89.7%	$167k	This is the model's Month 6 break-even path and the best steady-state setup.
Full utilization	$1.45M	$110k	$117k	92.4%	$1.22M	This case gives the widest cushion, as long as utilization stays high.

What breaks first if revenue slips or costs move up?

Stress test

The plan clears break-even in Year 1, but only by about $9.3k a month. If demand slips, repairs back up, repeat orders stay low, or jobs spread too far, that cushion can disappear fast.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change.	$109.8k/mo	$9.3k cushion	Thin cushion, so small misses matter.
Revenue shortfall	Year 1 average revenue falls to $109.8k/mo.	$109.8k/mo	$0.0k gap	A small demand miss wipes out the launch cushion.
Fixed-cost pressure	Monthly overhead rises by $10k.	$121.0k/mo	$1.9k gap	Cost creep pushes the plan just under water.
Margin pressure	Variable expenses rise 1 percentage point.	$111.0k/mo	$8.1k cushion	Fee drift still leaves only a slim buffer.
Combined pressure	Revenue falls to $109.8k/mo, overhead rises $10k, and variable expenses rise 1 point.	$122.2k/mo	$12.4k gap	Downtime, weak repeat orders, and wide routes can push the model below break-even.

What should you verify before you commit to a bigger stump grinder launch?

Founder checklist

The model only works if demand, CAC, and staffing line up before you buy more machines. Break-even lands in Month 6, but you still need about $586K of cash to reach the Month 7 low point and absorb the 18-month payback.

1Demand mix50/30/20 mix

Verify first-year demand lands near 50% landscapers, 30% contractors, and 20% homeowners, and that repeat orders stay near 1.50, 1.00, and 0.25 before you scale spend.

2Contribution59% CM

Here’s the quick math: contribution margin (revenue left after variable costs) has to stay near 59% after payment, hosting, support, and insurance costs, or Month 6 break-even slips.

3Staffing ramp5.5 FTE

Keep the first-year team near 5.5 full-time equivalent (FTE) roles so dispatch, support, and maintenance can keep machines moving on time.

4Fixed load$70.9K/mo

Don’t add more fixed spend until monthly revenue can clear about $110K, because the core load is already about $70.9K a month before extra machines or hires.

5Cash cushion$586K

Hold enough cash to cover the $586K low point in Month 7, since break-even comes in Month 6 and payback takes 18 months.

6Launch gate$150 / $600 CAC

Confirm customer acquisition cost (CAC) stays near $150 for buyers and $600 for sellers, and lock insurance, delivery routes, and maintenance turnaround before the first rental.