Break-Even Calculator

What this calculator does

Every product business, from an Etsy shop to a food truck, has one number that separates a hobby from a venture: how many sales a month cover the costs. This calculator finds it from three inputs — fixed costs, price, and variable cost per unit — and flags the situation where no amount of volume ever gets there.

The arithmetic

contribution per unit = price − variable cost
break-even units      = fixed costs ÷ contribution per unit

Selling at $35 with $14 of variable costs, each sale contributes $21. Against $1,200 of monthly fixed costs, break-even is 1,200 ÷ 21 = 57.1, so 58 units a month — about $2,030 in revenue. Sale 59 is where profit starts.

The rounding up matters: 57 units leaves you two dollars short, and break-even is a threshold, not an average.

Sorting costs into the right buckets

The division only works if the buckets are honest.

Fixed costs arrive whether or not you sell: rent, insurance, software, loan payments, a market-stall fee. The test is simple — if a month of zero sales still produces the bill, it is fixed.

Variable costs are what one more sale consumes: materials, packaging, shipping, and — the ones people forget — percentage fees. A 3% card fee plus a 6.5% marketplace commission on a $35 price is $3.33 of variable cost that never appears on a receipt. Fold every percentage into the per-unit figure, because a margin computed without them is fiction.

Some costs are genuinely mixed — a phone plan, a vehicle. Split them roughly and move on; break-even analysis is a planning tool, and a 5% error in the buckets moves the answer by a couple of units.

The margin is the business

Contribution margin — contribution over price — is the number that tells you what kind of business you have:

• At a 60% margin, fixed costs of $1,200 need $2,000 of revenue.
• At a 20% margin, the same fixed costs need $6,000.

Thin margins make break-even exquisitely sensitive to small changes: one dollar off the price at a 20% margin moves break-even by more units than five dollars of fixed-cost cuts. This is why the highest-leverage move in most small ventures is pricing, not expense trimming — and why the calculator’s warning case matters. When variable cost meets or exceeds price, selling more loses more, and no marketing budget fixes arithmetic.

Your time is a cost

The most common self-deception in side-business math is the free founder. Unpaid hours are a subsidy, and a venture that only clears break-even when your labor costs nothing is a hobby with revenue — which is fine, as long as it is a choice rather than a discovery.

Two honest ways to count it: put an hourly figure into variable cost (units × hours per unit), or pay yourself a fixed monthly amount and add it to fixed costs. The freelance rate calculator is the companion tool for pricing the hours themselves, and the 2,080-hour rule covers why billable hours are always fewer than they look.

From break-even to a real target

Break-even is survival, not success. Add a profit goal and the same division answers the better question:

units = (fixed costs + target profit) ÷ contribution per unit

The same shop wanting $2,000 a month of profit needs (1,200 + 2,000) ÷ 21 = 153 units — nearly triple the break-even volume. Running the target version first is a fast reality check on whether the channel can plausibly carry that volume at all.

Remember the profit is pre-tax: self-employment tax takes its cut on top of income tax, which the self-employment tax calculator estimates, and 1099 vs W-2 puts the whole self-employment picture against a salary for comparison.

What this leaves out

• Demand. The calculator says how many units you need, not how many the market will buy at that price. Those are different questions, and the second one is harder.
• Capacity. If 153 units means 300 hours of your month, the plan fails on hours before it fails on dollars.
• Startup costs. One-off equipment and inventory are an investment to recover, separate from the monthly arithmetic — the SBA’s startup cost guide covers structuring them.
• Price elasticity. Raising the price raises the margin and may lower the volume; the calculator holds them independent because only you can guess the trade.