Break-Even Revenue Calculator
Reviewed by Gerald G., founder & reviewing editor of CalcAuthority. Formula-based tool: every result is computed from the stated formula and your inputs — no hidden adjustments.
Every business has a number: the revenue at which it stops losing money each month. Below it, every day adds to a hole; above it, margin finally becomes profit. Most owners feel this number in their stomach but have never computed it — which means every month starts with an unknown finish line. This calculator produces it from two inputs: monthly fixed costs and gross margin. It is the second question in the operator sequence — after how long can I last, this is how much must I sell. Companion reading: Your Break-Even Number.
How It Works
Fixed costs are what you pay whether or not you sell anything: rent, insurance, salaries and owner pay, software, loan payments, utilities baseline. Gross margin is the fraction of each sales dollar left after the direct cost of delivering that sale — materials, direct labor, payment processing. If your margin is 40%, each revenue dollar contributes 40 cents toward fixed costs; so covering $12,000 of fixed costs takes $12,000 ÷ 0.40 = $30,000 of revenue.
That division — fixed costs by margin, not by price — is why thin-margin businesses need such intimidating top lines. It is also why margin improvements are so powerful: the same fixed costs at 45% margin instead of 40% drop the break-even from $30,000 to $26,667 — a month's finish line moved $3,333 closer without cutting a single expense. See the Overhead guide for the fixed-cost side of this lever.
Worked Examples
Example 1 — small service company. Fixed costs $12,000/month, gross margin 40%. Break-even revenue = $12,000 ÷ 0.40 = $30,000/month. Over 22 working days, that is $1,364 per working day. Every morning, the business wakes up needing $1,364 before it earns a cent for its owner beyond the salary already counted in fixed costs.
Example 2 — lean solo operation. Fixed costs $6,500 (including modest owner pay), margin 55%. Break-even = $6,500 ÷ 0.55 = $11,818/month. Knowing this, a $2,400 slow week is not a vague bad feeling — it is a measurable $550 shortfall against the month.
What This Result Means
Break-even revenue is your monthly finish line for survival — not success. Crossing it means the month paid for itself; profit only begins above it. The per-day figure is the most operational version: it turns an abstract monthly goal into a daily yes/no. And the formula exposes your two levers explicitly: lower fixed costs pull the line down dollar-for-dollar ÷ margin; higher margin pulls it down multiplicatively. If your break-even is above what the business realistically sells, no amount of hustle fixes it — the structure has to change.
Reading the Result
- Typical month is below break-even: the business is structurally underwater — cash reserves or the owner's unpaid hours are subsidizing it. Change fixed costs, margin, or model.
- Typical month is 0–15% above break-even: alive but fragile; one slow month erases the cushion. Growth spending should wait for margin.
- Typical month is 15–30% above: workable — real profit exists; start directing it deliberately (reserves, then growth).
- More than 30% above: strong position. The risk shifts to complacency about fixed-cost creep — recheck this number every time something is added.
Bands are editorial reading aids based on how much month-to-month revenue variance small businesses commonly see — not a published statistic. Your own revenue volatility determines how much clearance above break-even is truly safe.
When to Use This Calculator
Use this calculator:
- When setting monthly sales targets — the real target is break-even plus your profit goal, not a round number.
- Before adding any fixed cost — a $900/month lease at 40% margin raises your break-even by $2,250/month, forever. Decide with that number visible.
- When judging whether a slow month is a problem — compare revenue to break-even, not to your best month.
- When pricing changes are on the table — margin moves the break-even more than most owners expect; model the interaction with the Price Increase Impact Calculator.
Limitations
- Assumes gross margin is constant across sales; businesses with very different product margins should compute a blended margin or model each line separately.
- Fixed costs are rarely perfectly fixed — overtime admin, delivery, and utilities creep with volume.
- Break-even in accrual terms is not break-even in cash terms if customers pay late; pair with the Cash Runway Calculator.
- Owner pay must be inside fixed costs for the answer to be honest; a break-even that only works because you work free is not break-even.
Frequently Asked Questions
How do I find my gross margin if I have never calculated it?
From your books: (revenue − cost of goods/services sold) ÷ revenue, over the last 6–12 months. COGS means the costs that scale with each sale — materials, direct labor for delivery, merchant fees — not rent or admin. If your bookkeeping does not separate these, one afternoon categorizing your largest expense lines gets you close enough, and improving that bookkeeping is worth more than the afternoon costs.
Should my own salary be in fixed costs?
Yes — at the amount you actually need to live, even if you are not currently paying yourself that. A break-even computed without owner pay describes a business that only survives by not paying you, which is a hobby with invoices. Put the honest number in; if the resulting break-even looks unreachable, that is real information about the business model, not a formatting problem.
Is this the same as the break-even point they teach in accounting?
Same concept — fixed costs ÷ contribution margin — expressed in revenue dollars per month rather than units, because most service businesses do not sell identical units. If you do sell units, divide the break-even revenue by your average price to get break-even units. The accounting version and this one agree wherever they overlap.