Portable Charger Rental Break-Even Analysis: $73K Monthly Target

Fixed costs $7.7K/mo Core overhead

Contribution margin 87% After variable costs

Break-even revenue $8.9K/mo Revenue needed

Break-even timing Month 30 First positive month

Break-even calculator

Use this calculator to test how monthly revenue, variable expenses, and fixed costs shape break-even for a portable charger rental business.

Lean Base Full

Monthly revenue Revenue is the top line that covers variable costs and helps fund fixed overhead. $ Low sales High sales Variable expenses These rise with each rental, like payment fees, support, and upkeep. $ Low costs High costs

Money available to cover fixed costs $56,000 $65,000 revenue - $9,000 variable expenses

Margin ratio

86%

Covers fixed costs

Yes

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

Break-even chart Revenue Total costs

Which portable charger rental expenses are fixed and which move with sales?

Cost classification

Break-even only holds if fixed overhead, usage fees, and payroll steps are separated. In the first year, fixed overhead alone is $7,700 per month, before payroll and volume-linked fees.

Expense	Cost	Break-Even Treatment	Common Mistake
Office rent — $3,000/month	Fixed	Add $3,000 each month from Month 1 through Month 60.	Scaling rent with rental orders.
Other fixed overhead — $4,700/month	Fixed	Add software licensing $500, insurance $400, legal and accounting $1,000, office utilities $300, office supplies $200, server hosting $1,500, and marketing tools $800 monthly.	Leaving small monthly tools out of fixed overhead.
Leadership and operating payroll	Semi-fixed	Model CEO, CTO, operations, and engineering salaries by full-time equivalent staffing levels, not by each rental.	Dividing salaried payroll across orders as if fully variable.
Support and host acquisition payroll	Semi-fixed	Add staff in steps as the network grows; support reps and host acquisition roles start after the first year.	Hiring ahead of kiosk density and lifting break-even too early.
Payment processing fees	Variable	Apply 2.5% of revenue in the first year, declining to 2.1% by the fifth year.	Budgeting processing as a flat monthly subscription.
Customer support, rental specific	Variable	Apply 3.5% of revenue in the first year, declining to 2.5% by the fifth year.	Counting only salaried support and missing rental-volume load.
Power bank maintenance and replacement	Semi-variable	Apply 4.0% of revenue in the first year, declining to 3.0% by the fifth year.	Treating replacement and loss as fully fixed.
Kiosk connectivity and utilities	Semi-variable	Apply 3.0% of revenue in the first year, declining to 2.0% by the fifth year.	Treating connectivity, utilities, and venue fees as fully fixed.

How does break-even shift from a lean launch to a full rollout in portable charger rental?

Scenario table

Break-even improves as placement points grow and repeat use rises, because revenue scales faster than support and marketing. Still, commissions, customer support, and acquisition spend keep the bar high, so the gap between lean and full plans is real.

Planning cases only, not guarantees.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean launch	$9.4k	$1.2k	$63.5k	87.0%	$-55.3k	Revenue is well below the $73.1k monthly break-even point.
Base case	$204.5k	$23.1k	$171.0k	88.7%	$10.3k	This is the Month 30 break-even case, so the cushion is still narrow.
Full rollout	$1.19m	$114.3k	$367.7k	90.4%	$709.3k	At scale, higher placement density creates a wide cushion above break-even.

What breaks the break-even plan for portable charger rental?

Stress test

Base break-even is about $73K a month, but the model is fragile. A 20% revenue miss, a 10% fixed-cost bump, or variable expenses rising from 130% to 180% can push the target up fast.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change in the base case.	$73K	$0 gap	No cushion if utilization starts weak.
Revenue shortfall	Revenue lands 20% below plan.	$73K	$127K gap	Low utilization creates the first break.
Fixed-cost pressure	Fixed costs rise 10% above plan.	$803K	$730K gap	Higher location fees and overhead eat the cushion.
Margin pressure	Variable expenses rise from 130% to 180%.	$775K	$702K gap	Theft or loss above the 40% replacement allowance hurts fast.
Combined pressure	Revenue is 20% light, fixed costs rise 10%, and variable expenses reach 180%.	$803K	$220K gap	Slow turnaround plus cost creep can blow through launch cash.

What should you verify before signing placement agreements and ordering the first charger fleet?

Founder checklist

Don't sign placement deals or buy the first fleet until the host mix, CAC, and return flow match the model. With breakeven at Month 30 and minimum cash at -$1.17M in Month 29, small misses in traffic or fees matter fast.

1Host traffic40/30/30

Verify cafes, hotels, and retail sites actually have the traffic mix your model assumes before you sign, because weak foot traffic kills rental turns and slows payback.

2Deal terms$500 / $20

Lock the placement rules, insurance duties, and access limits, then keep host CAC near $500 and buyer CAC near $20, or the Month 30 breakeven slides out.

3Unit margin87% / 4.0%

Keep total variable load near 13% of revenue and replacement loss near the 4.0% maintenance line, because the fleet only works when every rental stays cheap to run.

4Fleet turns1.95x

Size the charger fleet to about 1.95 expected repeat orders per buyer in Year 1, not to the number of venues, so you do not overbuy idle units.

5Flow testEnd-to-end

Test checkout, return, payment, refund, failed-return workflows, and kiosk connectivity, because the launch only scales if the site stays usable inside the 3.0% utilities assumption.

6Cash runway-$1.17M / Month 29

Do not add the next hiring wave until usage can carry the $635K monthly fixed load, because minimum cash hits -$1.17M in Month 29 and breakeven lands in Month 30.