Fast Casual Restaurant Break-Even Analysis: $80K Monthly Sales

Fixed costs $36.2K/mo Base overhead

Contribution margin 83% After variable

Break-even revenue $43.6K/mo Revenue needed

Break-even timing Month 4 Model break-even

Break-even calculator

Test monthly revenue, variable expenses, and fixed costs against break-even.

Lean Base Full

Monthly revenue Revenue creates the margin that pays fixed costs. $ Soft volume Peak volume Variable expenses Direct costs rise with sales, like food and card fees. $ Low direct cost High direct cost

Money available to cover fixed costs $70,550 $85,000 revenue - $14,450 variable expenses

Margin ratio

83%

Covers fixed costs

Yes

Fixed monthly costs Rent, wages, and overhead stay due each month. $ Lean overhead Heavy overhead

Break-even chart Revenue Total costs

Which fast casual restaurant expenses are fixed, and which move with sales?

Cost classification

Break-even only works if fixed overhead stays separate from sales-driven inputs. For this restaurant, rent and core salaries set the monthly hurdle, while inventory, card fees, and consumables rise with revenue.

Expense	Cost	Break-Even Treatment	Common Mistake
Rent	Fixed	Include $15,000 per month in fixed monthly overhead.	Treating the lease as flexible when sales dip.
Utilities	Semi-variable	Split the $3,000 monthly base from usage tied to prep, service hours, and volume.	Ignoring swings from kitchen load and longer service hours.
POS System & Software	Fixed	Include $500 per month as fixed operating overhead.	Burying software fees inside card processing.
Cleaning Services	Semi-fixed	Start with $800 per month, then step up when added shifts require more cleaning.	Missing added cleaning needs as covers grow.
Food Inventory	Variable	Use 10.0% of sales in the first year and update the rate by year.	Using purchase dollars instead of actual usage.
Beverage Inventory	Variable	Use 4.0% of sales in the first year and track waste separately.	Missing spoilage, comps, and pour loss.
Credit Card Processing Fees	Variable	Use 2.0% of sales in the first year, adjusted for payment mix.	Forgetting that cash sales lower fee drag.
Salaried management	Fixed	Include the $85,000 general manager and $80,000 head chef annual salaries.	Treating all payroll as volume-driven labor.

How does break-even change from a lean launch to a full operating case?

Scenario table

As covers and average check rise, revenue grows faster than fixed payroll and overhead, so break-even gets easier to clear. The lean case works, but the base and full cases give a much safer cushion.

Planning cases use model assumptions only; they are not guarantees and exclude capex, taxes, debt service, and reserves.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean launch case	$1,057k	$180k	$666k	83.0%	$211k	Revenue clears break-even, but the cushion is still tight.
Base ramp case	$1,398k	$232k	$738k	83.4%	$428k	Higher volume gives a clearer buffer above break-even.
Full throughput case	$1,828k	$294k	$794k	83.9%	$740k	Strongest buffer; fixed costs are covered with room to spare.

What breaks the break-even plan for this restaurant?

Stress test

The plan covers overhead at about $1,057k monthly revenue against a roughly $803k break-even point, leaving a $254k cushion. A $255k sales drop, 10% higher fixed costs, or heavier variable expense pressure can erase that cushion fast.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change.	$803k	$254k cushion	The plan clears overhead, but traffic swings still matter.
Revenue shortfall	Monthly revenue falls by $255k.	$803k	$1k gap	A small sales miss wipes out the cushion.
Fixed-cost increase	Fixed overhead rises 10% to about $733k per month.	$883k	$174k cushion	Higher rent or staffing leaves less room for a slow week.
Margin pressure	Variable expenses rise to 220% of revenue.	$854k	$203k cushion	Waste, comps, or fees can push profit down fast.
Combined pressure	Revenue falls 20%, variable expenses rise to 220%, and fixed costs rise 10%.	$919k	$73k gap	Three hits at once turn the plan into a monthly loss.

What should a fast casual founder verify before signing the lease and opening day?

Founder checklist

Before you sign the lease or hire the full team, test whether the concept can clear the $803K break-even line and still support the $1.057M Year 1 plan. If Month 6 cash bottoms at $402K, the model needs real runway, not optimism.

1Lease Load$15K rent

Verify that $15K monthly rent still works against the $803K break-even revenue and the $1.057M plan, because the site only works if demand covers fixed occupancy cost.

2Payroll Load$44.2K/mo

Check that Year 1 labor runs near $44.2K per month across the manager, kitchen, bar, service, dish, and host roles, or the fixed-cost stack gets too heavy.

3Food Margin14.0% usage

Make sure the $35K opening inventory is enough and that ongoing food and beverage use stays near 14.0% of sales, because margin protects the break-even line.

4Build Spend$556K open

Confirm the full opening build of $556K for equipment, furnishings, POS, inventory, signage, and security is funded before ordering anything, since the cash hit comes before revenue.

5Cash Cushion$402K min

Keep at least $402K cash through Month 6, because that is where the model hits its lowest balance and the launch can stall if the cushion is thin.

6Cover Ramp450/week

Prove the kitchen can handle 450 weekly covers in Year 1, with the heaviest load on Friday through Sunday, before spending on marketing that does not move weekday traffic.