Break-Even Calculator

Imagine you spend $20,000 a month on rent, salaries, and software, you sell a product for $50, and each one costs you $30 to make and ship. Every sale puts $20 toward those fixed bills, so you need to sell 1,000 units - $50,000 in sales - just to get to zero. Sell one more and you finally start making money. That tipping point is your break-even point, and this break-even calculator finds it for any combination of fixed costs, price, and variable cost in one click.

What is the break-even point?

The break-even point is the level of sales at which your total revenue exactly equals your total costs - so your profit is zero. Below it you operate at a loss; above it, every additional sale produces profit. It is the single most useful number in early-stage pricing and budgeting because it answers the blunt question every owner asks: how much do I have to sell before this stops costing me money? Break-even analysis is part of cost-volume-profit (CVP) analysis, a core tool in managerial accounting.

The break-even formula

Break-even is built from three numbers: fixed costs, price per unit, and variable cost per unit. The formulas are:

The contribution margin is how much of each sale is left over after the variable cost - the part that "contributes" to paying off fixed costs and then to profit. Dividing your fixed costs by that per-unit contribution tells you how many units it takes to fully cover them. You can also find break-even revenue directly as fixed costs ÷ contribution margin ratio, where the ratio is contribution margin ÷ price.

Fixed vs. variable costs

The whole calculation hinges on sorting your costs into two buckets correctly:

• Fixed costs don't change with how much you sell within a given period - rent, base salaries, insurance, accounting, software subscriptions, and loan payments.
• Variable costs rise and fall with each unit - raw materials, packaging, shipping, sales commissions, and payment-processing fees.

Some costs are semi-variable (a phone plan with a base fee plus per-minute charges, or staff who work more hours in busy months). For a clean estimate, split those: put the base portion in fixed costs and the per-unit portion in variable costs.

How to use this break-even calculator

You only need three inputs. Enter them in order and the result updates instantly:

1. Total fixed costs: add up every cost for the period that doesn't change with sales (use a month or a year - just be consistent).
2. Price per unit: the amount a customer actually pays you for one unit, after any standard discount.
3. Variable cost per unit: everything it costs to produce and deliver one unit - materials, shipping, fees.

Read the big number at the top for the units to break even, then check the break-even revenue and contribution margin below it. The profit/loss table shows what happens at 50%, 100%, 150%, and 200% of break-even volume so you can see how quickly profit builds once you pass the line.

Who this calculator is for

Break-even analysis is useful at almost every stage of a business:

• New founders pressure-testing whether a price and cost structure can ever turn a profit.
• Small-business owners deciding whether to add a product, hire, or sign a lease.
• Freelancers and makers setting prices that actually cover their tools and time - often alongside a markup or profit margin check.
• Sales and ops managers setting realistic monthly quotas tied to covering overhead.
• Anyone writing a business plan who needs a credible "units to profitability" figure for investors.

Worked example 1: a physical product

A candle maker has $6,000 in monthly fixed costs (studio rent, insurance, a part-time helper). Each candle sells for $24 and costs $9 in wax, wicks, jars, and shipping. The contribution margin is $24 − $9 = $15. Break-even units = $6,000 ÷ $15 = 400 candles, and break-even revenue = 400 × $24 = $9,600. Selling the 401st candle earns the first $15 of profit.

Worked example 2: a service or subscription

A SaaS tool charges $40/month per customer and pays $6 per customer in hosting and payment fees. Fixed costs (engineering, rent, tools) are $34,000/month. Contribution margin = $40 − $6 = $34. Break-even = $34,000 ÷ $34 = 1,000 customers, or $40,000 in monthly recurring revenue. Because the contribution margin ratio here is 85%, most of every new dollar of revenue past break-even drops to profit - a hallmark of low-variable-cost software businesses. If you are weighing whether the engineering spend that creates those fixed costs will pay off, run the figures through the ROI Calculator alongside this one.

Worked example 3: adding a profit target

Break-even gets you to zero, but you probably want a profit. To find the volume for a target profit, just add it to fixed costs. If the candle maker above wants $3,000 of monthly profit, solve ($6,000 + $3,000) ÷ $15 = 600 candles ($14,400 in sales). The same lever works for taxes: if you need a certain pre-tax profit, add it on top before dividing by the contribution margin.

Reference: contribution margin and break-even at a glance

This table shows how price and variable cost combine into a contribution margin, and the break-even units that result from a fixed $10,000 of fixed costs:

Notice that a higher contribution margin - whether from a higher price or a lower variable cost - drops the break-even count fast. Doubling the margin roughly halves the units you must sell.

How to lower your break-even point

If your break-even feels out of reach, three levers move it - and the first two are usually the most powerful:

• Raise the price. A higher price widens the contribution margin directly, so fewer units are needed - as long as demand holds.
• Cut the variable cost. Cheaper materials, better supplier terms, or lower shipping each widen the margin per unit.
• Reduce fixed costs. Lower rent, fewer subscriptions, or variable-pay staffing shrink the total you have to cover.

Key terms explained

• Contribution margin: price minus variable cost per unit - the cash each sale frees up for fixed costs and profit.
• Contribution margin ratio: contribution margin divided by price, expressed as a percentage. Useful for revenue-based break-even.
• Margin of safety: how far current (or expected) sales sit above break-even, often shown as a percentage - your cushion before you slip into a loss.
• Operating leverage: the degree to which a business relies on fixed costs. High fixed, low variable structures have higher break-even points but more profit per extra sale once past it.
• Cost-volume-profit (CVP) analysis: the broader framework that break-even analysis belongs to, modeling how profit changes with sales volume.

Limitations and assumptions

The break-even model is a clean estimate, and it relies on some simplifications:

• It assumes a constant price and a constant variable cost per unit - no volume discounts on either side.
• It treats fixed costs as a single flat total, even though some costs step up as you grow (a second location, more equipment).
• It is a single-product model. With a product mix you should use the weighted-average contribution margin ratio on revenue.
• It is pre-tax and ignores timing - cash break-even can differ from accounting break-even when there are non-cash costs like depreciation.

Break-even in dollars vs. break-even in units

There are two equally correct ways to express a break-even point, and which one you reach for depends on your business. The unit method - fixed costs ÷ contribution margin per unit - is the natural fit when you sell discrete things you can count: candles, t-shirts, software seats, billable jobs. It answers "how many do I have to sell?" The revenue (dollar) method - fixed costs ÷ contribution margin ratio - answers "how much do I have to bring in?" and is the better tool when "a unit" is fuzzy: a restaurant, a salon, a consultancy, or any shop selling a wide mix of items at different prices. Both methods describe the same point on the same line; they just label it differently. This calculator reports both, so a service business can ignore the unit count and read the revenue figure, while a maker who thinks in pieces can read the unit count instead.

The two are linked by the contribution margin ratio. If your contribution margin is $20 on a $50 price, the ratio is 40%, meaning 40 cents of every sales dollar is available to cover fixed costs. Divide $20,000 of fixed costs by 0.40 and you get $50,000 of break-even revenue - the same answer as 1,000 units × $50. When you compare two businesses, the ratio is often more revealing than the raw margin: a 40% ratio means the firm keeps working capital efficient, while a 10% ratio (common in grocery or distribution) means a tiny change in costs or prices can swing the whole operation between profit and loss.

The margin of safety: your cushion above break-even

Knowing the break-even point is step one; knowing how far your actual sales sit above it is step two. That gap is the margin of safety, and it tells you how much sales can fall before you start losing money. The formula is simple: margin of safety = (actual or expected sales − break-even sales) ÷ actual sales, expressed as a percentage. If your candle studio breaks even at 400 candles and you expect to sell 520, your margin of safety is (520 − 400) ÷ 520 ≈ 23% - demand could drop almost a quarter before you slip into the red.

A thin margin of safety is a warning sign, especially for seasonal businesses or anyone whose sales swing month to month. A business breaking even at 95% of its forecast has almost no room for a slow week, a price war, or a supplier cost increase. A wider margin of safety - say 30% or more - means you can absorb a bad month, invest in growth, or weather a recession without immediately cutting staff. When you run the calculator, take the break-even number and compare it against a realistic, even conservative, sales forecast rather than your best-case dream; the difference between the two is the real measure of how safe your plan is.

Break-even time: how long until you recover your investment

Break-even units and break-even revenue answer "how much," but founders often also want to know "how long." If you know your expected sales rate, dividing the break-even volume by it gives a rough break-even time. Selling around 130 candles a week against a 400-candle monthly break-even means you cover your monthly fixed costs about three weeks into the month, then profit for the last week. For a one-time investment - buying a $9,000 machine that cuts variable cost - the related idea is the payback period: how many months of extra contribution margin it takes to earn back the upfront spend. The two concepts work together: break-even analysis tells you the sales floor, and payback timing tells you whether an investment that changes your cost structure pays for itself fast enough to be worth doing.

Adding taxes and a profit target the right way

The plain break-even point gets you to zero profit, but no one runs a business to break even. To find the sales volume that hits a specific goal, you change just one term in the formula. For a target profit, use (fixed costs + target profit) ÷ contribution margin per unit. Treat the desired profit as if it were an extra fixed cost you must cover. For an after-tax target, first gross up the goal: if you want $30,000 in your pocket and your tax rate is 25%, you need $30,000 ÷ (1 − 0.25) = $40,000 in pre-tax profit, then add that $40,000 to fixed costs before dividing. The break-even point itself is unaffected by income tax - you pay tax on profit, and at break-even there is no profit - which is why the base calculation stays pre-tax and clean.

Related concepts and calculators

Break-even sits next to a family of pricing and profit tools. Once you know the volume you must sell, these help you set the prices and costs that feed the formula:

• To turn a cost into a selling price, use the Markup Calculator - the price it produces becomes the "price per unit" input here.
• To check the profit slice of each sale, use the Margin Calculator and Profit Margin Calculator; the contribution margin on this page is a close cousin of gross margin.
• To judge whether an investment that lowers your costs is worth it, the ROI Calculator weighs the return; pairing it with break-even shows both the payoff and the sales floor.
• To plan labor into your variable or fixed costs, the Hourly to Salary and Overtime Calculators help size pay.
• If you are funding the venture with debt, the Business Loan Calculator turns financing into the monthly fixed cost you enter above, and the Sales Tax Calculator helps you separate tax from the true price customers pay you.

Sources

• U.S. Small Business Administration (SBA) - Calculate your startup costs and break-even.
• Standard managerial accounting: cost-volume-profit (CVP) analysis and the contribution-margin method.