By "Long story short, I've been working on an ed-tech website for the last 6 months and it's pretty much ready to launch. Once it is launched, the site's fixed costs will be around 5k a month and I'll need around 600 users to recoup that money."
— Source: r/Entrepreneur (189 upvotes)
Before you scale, you need to answer one question: How many units must I sell to stop losing money?
For a business with $60,000 in monthly fixed costs (salaries, rent, software), the break-even point isn't obvious from revenue alone. It depends on how much profit each unit contributes after all variable costs.
That's break-even analysis: the profitability threshold, expressed in units or dollars, where total contribution margin equals fixed costs.
For consumer brands, break-even differs by channel. A product with $25 contribution margin on DTC needs 2,400 units to break even at $60K fixed costs. The same product on Amazon, with $12 contribution margin (higher fees), needs 5,000 units.
Break-Even Units = Fixed Costs ÷ Contribution Per Unit. This is how you size market fit, pricing, and channel strategy.
What is Break-Even Analysis?
The 40-word definition
Break-even analysis calculates how many units (or dollars of revenue) you must sell to cover all fixed costs and reach zero profit/loss. Formula: Break-Even Units = Fixed Costs ÷ Contribution Margin Per Unit. It's the profitability threshold: above it, you're profitable; below it, you're losing money.
Break-even is the point where Total Contribution Margin = Total Fixed Costs. At that moment, all contribution is flowing to fixed costs, and profit is zero.
Below break-even: you're burning cash. Each unit sold covers some fixed costs, but not all.
Above break-even: you're profitable. Each unit sold covers its fixed cost allocation and generates profit.
For consumer brands, this matters because:
- It sets cash flow timing: If monthly fixed costs are $60K and you sell at $30 contribution per unit, you need 2,000 units that month to break even and stop burning cash.
- It guides pricing: If you expect to sell 1,000 units, break-even analysis tells you the minimum price needed.
- It reveals channel viability: If Amazon requires 5,000 units to break even and DTC requires 2,400, DTC is more viable.
- It informs launch timing: If you can't reach break-even within your cash runway, you need to raise, bootstrap, or cut fixed costs.
The Break-Even Formula
Simple formula
Break-Even Units = Fixed Costs ÷ Contribution Margin Per UnitBreak-Even Revenue = Break-Even Units × Average Revenue Per UnitBreak-Even Revenue (Alternative) = Fixed Costs ÷ Contribution Margin %
Both formulas get you to the same place: the point where profit is zero.
Example: Beauty brand
Illustrative example.
Monthly fixed costs: $50,000
Serum selling for: $72
Variable costs: COGS $18, fulfillment $7, fees $2, return reserve $3 = $30 per unit
Contribution per unit: $72 - $30 = $42
Break-Even Units: $50,000 / $42 = 1,190.5, round up to 1,191 units
Break-Even Revenue: 1,191 × $72 = $85,752
This brand must sell 1,191 units of the serum a month (about 40 a day over 30 days) to break even on fixed costs. Below that, they're burning cash. Above that, each unit generates profit.
Key: Use contribution margin, not gross margin
Many brands calculate break-even using gross margin (revenue - COGS only). This is a critical mistake because it ignores fulfillment, fees, and returns.
Wrong (using gross margin):
Gross margin = $72 - $18 = $54
Break-even = $50,000 / $54 = 926 units
(This is too optimistic.)
Right (using contribution margin):
Contribution = $72 - $30 = $42
Break-even = $50,000 / $42 = 1,191 units
(This reflects reality: fulfillment, fees, and returns eat margin.)
Using contribution margin, break-even is about 29% higher (1,191 vs 926 units). Planning on the lower number means planning on volume that will not cover your costs.
Fixed Costs vs Variable Costs: Classification Matters
Calculating break-even requires clean separation of fixed and variable costs. Many brands get this wrong, which distorts their profitability threshold.
What counts as fixed cost?
| Cost | Fixed? | Why |
|---|---|---|
| Rent | Yes | Same amount each month regardless of sales |
| Salaries (core team) | Yes | Doesn't scale with unit volume (mostly) |
| Software subscriptions (Shopify, WMS) | Yes | Fixed monthly fee |
| Insurance | Yes | Annual cost, allocated monthly |
| Utilities | Mostly yes | Baseline is fixed; above a certain level may rise |
| Marketing payroll (if allocated to marketing team) | Yes | Team cost, not per-unit |
| Accountant/bookkeeper | Yes | Fixed monthly retainer |
What counts as variable cost?
| Cost | Variable? | Why |
|---|---|---|
| Product COGS | Yes | Changes per unit sold |
| Fulfillment (pick/pack/ship) | Yes | Scales with orders |
| Payment processing (percentage plus per-transaction fee) | Yes | Changes per transaction |
| Platform fees (Amazon referral fee by category) | Yes | Scales with revenue |
| Return shipping and refunds | Yes | Only when returns occur |
| Ad spend | Depends | Treat it as a fixed monthly budget in break-even, or as cost per order if you buy each order through ads. Be consistent. |
| Packaging and labels | Yes | Per unit shipped |
| Returns reserve (allocated per unit) | Yes | Scales with volume |
Semi-variable costs (the tricky ones)
Some costs are "step costs": they stay fixed at low volumes, then jump at higher volumes.
- 3PL warehousing: $1.00 per unit up to 10,000 units per month, then $0.80 per unit above that.
- Headcount: You can scale revenue 2-3x before hiring another team member.
- Server costs: Shopify plan is fixed at $300/month up to a certain transaction volume.
For break-even analysis, decide: at your expected volume, is it fixed or variable? If you expect 5,000 units and 3PL is $1.00 all the way, call it variable. If you expect 8,000 units at the lower rate, split it: $5,000 fixed, + $0.80 per unit variable.
Worked Examples: Break-Even by Scenario
Example 1: DTC apparel brand (new launch)
Illustrative example: Thinking about launching an apparel line with a fixed team.
- Monthly fixed costs: Founder salary $5K + temp marketing hire $3K + rent $2K + software and tools $1K = $11K (ad spend excluded for now)
- Product: T-shirt
- Selling price (DTC): $35
- Variable costs: COGS $8 + fulfillment $6 + payment processing $1.05 + return reserve $1.50 = $16.55
- Contribution per unit: $35 - $16.55 = $18.45
| Metric | Calculation | Result |
|---|---|---|
| Monthly fixed costs | Given | $11,000 |
| Contribution per unit | $35 - $16.55 | $18.45 |
| Break-even units | $11,000 / $18.45 = 596.2, round up | 597 units |
| Break-even revenue | 597 × $35 | $20,895 |
| Units needed daily | 597 / 30 days | About 20 a day |
This brand needs to sell 597 T-shirts a month (about 20 a day) to cover $11,000 of fixed costs. At 600 units, profit is $70 (600 × $18.45 = $11,070, minus $11,000). At 800 units it is $3,760. Now add ad spend: a $5,000 monthly ad budget raises fixed costs to $16,000 and break-even to 868 units ($16,000 ÷ $18.45 = 867.2, round up). Those ads must bring in at least 271 extra units a month just to pay for themselves.
Example 2: Same product, three channels
Illustrative example: Same $11K fixed costs, same T-shirt, but sold across DTC, Amazon, and wholesale.
| Channel | Price | Variable Costs | Contribution | Break-Even Units | Break-Even Revenue |
|---|---|---|---|---|---|
| DTC | $35 | $16.55 | $18.45 | 597 units | $20,895 |
| Amazon FBA | $35 | $23.50 (COGS $8 + FBA $7.50 + referral $5.25 + return $2.75) | $11.50 | 957 units | $33,495 |
| Wholesale | $18 | $8.50 (COGS $8 + distributor pickup $0.50) | $9.50 | 1,158 units | $20,844 |
The same product has radically different break-even points: DTC requires 597 units, Amazon 957 (60% more), and wholesale 1,158 (94% more). This is why channel mix matters. DTC has the lowest break-even because contribution per unit is highest. Amazon's higher fees inflate break-even; wholesale's lower price inflates it further.
Break-Even by Channel: Why Mix Matters
Break-even is not one number for a business. It's one number per channel, per product, per business model. Most brands focus on total company revenue and miss channel-level profitability.
Here's what matters:
- DTC: Lowest break-even because you own customer data and have lowest platform fees. Higher marketing CAC, but repeat rate makes up for it.
- Amazon: Higher break-even because referral fees (set by category) and FBA fees reduce contribution per unit, and buyers belong to Amazon.
- Wholesale: Often the highest unit break-even because the wholesale price is far below retail. No consumer acquisition cost, but trade spend, deductions and payment terms still apply.
A smart channel strategy aligns fixed costs to break-even scale. If your fixed costs are $60K and DTC break-even is 2,400 units, you need a marketing strategy that delivers 2,400+ DTC units monthly. If you can't, either lower fixed costs or shift volume toward the channel with the highest contribution per unit.
Using Break-Even Analysis for Decisions
Decision 1: Should I launch this product?
Calculate break-even units for the product. Compare expected demand with break-even. The gap is your margin of safety: (expected units - break-even units) ÷ expected units. The thinner it is, the less room you have for a weak month.
Example: New product has $25K break-even units at $15 contribution per unit. You expect to sell 25K units based on market research. Launch, because you're 1x above break-even. But if you expect 18K units, the risk is high: one bad month and you're burning cash.
Decision 2: What should I price this at?
Work backward from expected volume. If you expect to sell 1,000 units and need to break even, and your variable costs are $30, set price so that 1,000 × (Price - $30) equals your fixed costs.
Example: Monthly fixed costs $50K. Variable costs $30. Expected volume 1,500 units. Break-even price = ($50K / 1,500) + $30 = $33.33 + $30 = $63.33. Anything above $63.33 per unit generates profit.
Decision 3: What if I add a new channel?
New channels change the mix. If Amazon break-even is 5,000 units and DTC is 2,400, adding Amazon increases total company break-even. Calculate blended break-even across channels based on your expected mix.
Example: DTC break-even 2,400 units at $25 contribution. Amazon break-even 5,000 units at $12 contribution. Expected mix 60% DTC, 40% Amazon. Blended break-even = (2,400 × 0.6 × $25 + 5,000 × 0.4 × $12) / Total Units Needed = depends on volumes, but roughly 3,700 units.
Decision 4: When will I become profitable?
If monthly fixed costs are $60,000 and you sell 3,000 units at $20 contribution each, contribution is $60,000 and you break even that month. At 1,500 units, contribution is $30,000 and you lose $30,000. Map expected units month by month against break-even and you can see when, and if, the business turns profitable.
Without break-even analysis, profitability is a guess. With it, it's a schedule.
From Guessing to Knowing Your Profitability Threshold
Most founders launch a product without calculating break-even. They get excited about market fit, revenue, and traction. Then, 6 months in, they realize they need 3x more volume to hit profitability, or they need to cut fixed costs by half.
Break-even analysis prevents that surprise. It ties unit volume, price, costs, and fixed overhead into one equation. You can see the threshold before you build.
The obstacle: calculating break-even across products, channels, and time requires live data. You need monthly contribution margin by product and channel, updated as costs and prices change. Most brands lock it into an Excel forecast and stop updating it. Real break-even changes when fees rise, when fulfillment negotiates new rates, when repeat rate climbs. An FP&A model that links contribution by product and channel to fixed costs lets you recompute break-even whenever those inputs change.
Stop launching blind. Know your break-even point by channel and product.
Niblin models break-even units and revenue by product and channel from contribution margin by channel and SKU. Update pricing and fixed cost allocation. See how channel mix affects profitability. Live in weeks.
See how Niblin models it
Key Takeaways
- Break-even units = Fixed Costs ÷ Contribution Margin Per Unit. This is where profit becomes zero.
- Fixed costs stay the same each month: rent, salaries, software, insurance. Variable costs change with unit volume: COGS, fulfillment, fees.
- Use contribution margin (revenue - all variable costs), not gross margin (revenue - COGS only). It includes fulfillment, fees, and returns.
- Break-even differs by channel. DTC has lower break-even than Amazon (higher fees), and wholesale has higher break-even than DTC (lower prices).
- Turn monthly break-even into a daily target: 597 units a month is about 20 a day. Below that pace, the month loses money.
- Price can be set using break-even analysis. Work backward: if fixed costs are $50K and you expect 1,500 units, price must cover $33.33 + variable costs.
- Break-even changes when fees, fulfillment costs, or fixed costs change. Recalculate when a channel adds fees or you scale the team.
- Add a margin of safety above break-even. Selling exactly at break-even leaves no room for error, so know how far expected volume sits above it.
Frequently Asked Questions
What is break-even analysis?
Break-even analysis calculates the number of units (or revenue) you must sell to reach zero profit/loss. Formula: Break-Even Units = Fixed Costs / Contribution Margin Per Unit. It's the profitability threshold: below it, you're burning cash; above it, you're profitable.
What are fixed costs?
Fixed costs are expenses that stay the same each month regardless of sales volume: rent, salaries, software subscriptions, insurance. They don't change whether you sell 10 units or 10,000 units. Estimate them monthly, then allocate to product or channel if you need break-even at that level.
What is contribution margin per unit?
Contribution Margin Per Unit = Revenue Per Unit - All Variable Costs Per Unit. Variable costs include COGS, fulfillment, platform fees, payment processing and returns reserve (plus ad cost per order if you buy each order through ads). It's what each sale contributes to fixed costs and profit.
Should I use gross margin or contribution margin for break-even?
Use contribution margin, not gross margin. Gross margin ignores fulfillment, fees, and returns, making break-even look too optimistic. Contribution margin includes all variable costs and shows the real profitability threshold.
How do I calculate break-even revenue?
Break-Even Revenue = Break-Even Units × Average Revenue Per Unit. Alternatively, Break-Even Revenue = Fixed Costs / Contribution Margin %. Both get you the same number: the dollar volume needed to break even.
Why does break-even differ by channel?
Channels have different cost structures. DTC carries payment processing and fulfillment, Amazon carries referral fees by category plus FBA fees, and wholesale sells at a much lower unit price with trade spend and deductions. Higher fees mean lower contribution per unit, which means higher break-even volume.