Break-Even Units Calculator

Why break-even is the most honest DTC metric

You can lie to yourself about ROAS. You can fudge LTV. Break-even units is brutal because it tells you a single integer: the number of units you need to sell this month to cover every bill. Below it, you're losing money. Above it, every unit adds fresh contribution. It's the only metric where there's nowhere to hide — the calculator either says you're 650 units or 6,500 units, and the bank account confirms the truth.

The formula is simple: Break-even units = Fixed Costs / (Price − Variable Cost − Ad CAC). The nuance lies in what you actually put in the three inputs. Most founders lowball fixed costs by 30-50% and ignore ad CAC as a per-unit cost, producing break-even estimates that are wildly optimistic.

What counts as "fixed" vs "variable" — the DTC version

Traditional accounting splits costs into fixed (don't change with volume) and variable (scale linearly). In DTC, three categories require nuance:

• Fixed (don't scale with orders): Salaries, rent, Shopify plan fee, annual SaaS (Klaviyo base, Triple Whale, shipping insurance tool base), theme amortization, insurance, tools + agencies on retainer.
• Variable (per-unit): COGS, packaging, pick-pack, shipping to customer, payment processing, return logistics, inventory financing cost.
• Hybrid (model as per-unit CAC): Paid advertising. Some is fixed (branded search, retargeting to repeat customers) but prospecting scales linearly with acquisition goals. Easiest: treat as CAC per unit.

A worked example (mid-stage DTC brand)

Monthly P&L inputs for a hypothetical apparel brand:

• Fixed costs: $22,000 (team $14K, SaaS $1,800, Shopify $399, apps $600, rent $2,500, misc $2,700)
• Price per unit: $68 AOV
• Variable cost per unit: $31 (COGS $18, packaging $1.50, pick-pack $3, shipping $6, processing $2.30, returns $0.20)
• Ad CAC per unit: $14 (blended, includes branded)

Contribution per unit = $68 − $31 − $14 = $23

Break-even units = $22,000 / $23 = 957 units/mo

At 1,100 units/mo selling, the brand makes $22,000/mo revenue × 0 / unit over break-even = (1,100 − 957) × $23 = $3,289 profit/mo. Margin of safety: (1,100 − 957) / 1,100 = 13%. Dangerous — a 10% Meta CPM spike turns this into a loss.

Fix: raise price $3 (to $71) takes contribution from $23 to $26. New break-even: 846 units. Margin of safety jumps to 23% — a meaningful buffer.

Margin of safety — the number that actually matters

Break-even alone isn't the insight. Margin of safety is: the gap between your actual sales volume and break-even, as a percentage. Benchmarks:

• <15%: Fragile. One bad month ends you. Most pre-scale DTC brands.
• 15-30%: Normal for growth-stage DTC. Small CPM shocks still hurt.
• 30-50%: Healthy. You can weather a seasonal dip or freight spike.
• >50%: Robust. Either a premium-priced brand or heavily optimized cost structure.

How to lower break-even (in order of practical leverage)

1. Raise AOV (direct): A $5 AOV bump at constant cost adds $5 to contribution per unit, lowering break-even ~18% in the example above. Bundles, thresholds, post-cart upsells. See bundle pricing.
2. Cut variable cost (direct): Freight renegotiation (-$0.80/unit), packaging SKU consolidation (-$0.25), payment processing (switch to Shopify Payments, -$0.30). See variable cost per order.
3. Lower ad CAC (direct): Creative volume, LP conversion, retargeting mix. See customer acquisition cost.
4. Eliminate fixed bloat: Audit the SaaS and apps stack. Most DTC brands are paying for 3-5 tools they no longer use.
5. Shift fixed to variable: Contractors instead of FTE, usage-based SaaS, commission-based agencies. Scales volatility down.
6. Raise price: Last resort but often the most powerful. Pair with our product pricing tool.

Launch-stage break-even (the mistake new brands make)

Pre-launch founders wildly under-count fixed costs. A typical "my product costs $12 to make, I'll sell it for $42, easy money" calculation forgets:

• Photography ($1,500-$6,000 one-time, amortize 12 months).
• Website design / Shopify setup ($2K-$10K).
• Packaging inventory (typically 6-12 months of packaging paid upfront, $5K-$20K).
• Initial inventory (MOQ 500-5,000 units, $5K-$50K).
• Paid media to get traction ($5K-$25K/mo minimum for signal).
• Founder opportunity cost (if you're paying yourself below market, not really fixed in Year 1).
• Legal + accounting ($3K-$10K Year 1).

Amortize over 12 months and a "$2K/mo fixed cost" launch-stage plan becomes $8K-$15K/mo of true fixed cost. Run this calculator with the honest number.

When break-even is wrong

Contribution margin per unit assumes cost is linear. In practice it isn't: packaging costs drop at MOQ, ad CAC rises with volume (diminishing returns), freight negotiations improve at higher tonnage. Run the calculation at three volumes — current, 2x, 5x — to see break-even at each scenario. Multi-scenario break-even is how to plan capital raises or inventory buys realistically.

Common break-even mistakes

• Including ad spend in fixed costs (inflates fixed, under-states CAC sensitivity).
• Using gross margin instead of contribution (ignores variable cost line items).
• Not computing margin of safety — just hitting break-even isn't success.
• Forgetting tax, founder draw, and owner salary in pre-Series A companies.
• Not re-running when you add a team hire or a SaaS subscription.

Three brand break-even scenarios worked end-to-end

Numbers feel abstract until you walk them through a real P&L. Three cases operators actually run into:

Scenario 1 — Pre-launch founder, $40K raised, single SKU apparel. Fixed costs (honest): founder draw $3,500, Shopify $105, apps $180, freelance designer $800, amortized photography ($4,500/12mo) $375, amortized web dev ($6,000/12mo) $500, accounting $250, insurance $90 = $5,800/mo. Initial inventory cost $18,000 (1,000 units at $18 landed) amortized over 12 months = $1,500. Total fixed: $7,300/mo. Price $58. Variable per unit $22. Ad CAC $18. Contribution = $18/unit. Break-even: 7,300/18 = 406 units/mo. At typical launch velocity (50-150 units/mo first 90 days), brand is burning $5K-$6K/mo until CVR + CAC improve. Cash runway on $40K: ~7 months. Verdict: tight; must hit 300 units/mo by month 4.

Scenario 2 — Growth-stage beauty, $1.2M run-rate, Meta-led. Fixed: team $38K (2 FTE + founder), Shopify Advanced $399, Klaviyo $820, other apps $1,400, agency retainer $6,000, rent/utilities $1,800, accounting/legal $800, tools $1,200 = $50,400/mo. Price $64. Variable $25.50. Ad CAC $17.20. Contribution = $21.30. Break-even: 50,400/21.30 = 2,367 units/mo = $151K revenue/mo. Currently at 3,100 units = $198K/mo. Margin of safety: (3,100-2,367)/3,100 = 23.6%. Profit/mo: 733 × $21.30 = $15,600. Verdict: marginal. A 10% Meta CPM spike lifting CAC to $21 drops contribution to $17.30, break-even jumps to 2,913 units — almost eliminates the profit cushion. Fix: AOV bundle to $72 lifts contribution to $25.60, break-even drops to 1,969 units, safety to 36%.

Scenario 3 — Mature subscription brand, $4.2M run-rate, 60% subscription revenue. Fixed: team $92K, SaaS stack $4,200, rent $3,000, agency $8,500, insurance $400, misc $2,500 = $110,600/mo. Price $48 (first order discounted). Variable $19. Blended CAC $22 on new customers but $0 on subscription reorders. Treat subscription reorders as full-contribution units: contribution on new = $7/unit; contribution on subscription reorder = $29/unit. Monthly: 1,800 new customers × $7 = $12,600 + 5,400 subscription units × $29 = $156,600 = $169,200 total contribution. Break-even contribution: $110,600/mo. Buffer: $58,600/mo. Verdict: healthy at scale; the subscription base IS the profit. If churn doubles (subscription drops from 5,400 to 2,700/mo), contribution falls to $91,000/mo — unprofitable overnight. This is why subscription churn math is existential for this business.

Fixed cost audit checklist — line-by-line for the DTC operator

Most brands have fixed-cost bloat that nobody owns. Audit these categories quarterly:

• Team & contractors: salary, benefits, payroll tax (add 12-18% to base), founder draw, freelance retainers.
• Platform base fees: Shopify plan ($39-$2,300+), Klaviyo base tier, Gorgias base, review tool, subscription tool base, analytics.
• Apps & SaaS: audit monthly. 20-40% of apps in most Shopify stores go unused.
• Agencies & retainers: design, paid media, SEO, CRO, PR, legal. Flat-fee retainers = fixed.
• Real estate: office rent, coworking, fulfillment warehouse base fees.
• Insurance: GL, product liability, D&O, workers comp.
• Amortized one-times: photography, branding, website design, trade show booths, PR events.
• Professional services: accounting ($250-$2,500/mo), fractional CFO ($500-$5,000), bookkeeping.
• Travel & team meals: for remote/distributed teams, non-trivial.
• Debt service: line of credit interest (variable with rate, but fixed minimum payment).

Typical finding: a $1M/yr DTC brand has 8-14% of fixed costs in apps/SaaS nobody actively uses. That's $7K-$12K/yr in pure savings.

Variable cost per unit — the line most founders undercount

What should really be in "variable cost per unit" for a DTC brand:

• Product COGS (landed): supplier cost + duties + inbound freight. Often under-counted by 8-15% because inbound freight is tracked in a different account.
• Packaging: all-in per order, not just the box. See packaging cost tool. Typical $1.00-$3.50.
• Pick/pack fee (3PL): $2.50-$4.50 per order.
• Outbound shipping: $4.50-$11.00 zone 4 ground. See shipping compare.
• Payment processing: 2.15-3.5% of AOV + $0.30. On $60 AOV = $2.10.
• Return logistics allocation: return rate × (return shipping + re-stocking + damage write-off). At 8% return rate on $5 return cost = $0.40/unit.
• Inventory financing cost: days-inventory-on-hand × cost of capital. Often 0.5-2% of COGS.
• Sales tax automation (TaxJar, Avalara): $0.10-$0.50 per order at scale.
• Variable apps (per-order charges): shipping insurance if merchant-absorbed, Route, Corso.

Sum typically runs $22-$34 per unit on a $55-$75 AOV brand. If your "variable cost" is $15 and AOV is $65, you're missing something.

Break-even sensitivity table — stress testing the business

The right way to use break-even is to stress-test it against realistic 2026 risks. Baseline: $30K fixed, $60 AOV, $24 variable, $16 CAC. Contribution $20. Baseline break-even: 1,500 units.

• Meta CPM +20% (CAC → $19.20): Contribution $16.80. Break-even 1,786 units. +19% more volume needed.
• COGS inflation +10% (variable +$2): Contribution $18. Break-even 1,667 units. +11%.
• Shipping rate +8%: Contribution $19.36. Break-even 1,550 units. +3%.
• Return rate 8% → 15%: Effective contribution $17.50. Break-even 1,714 units. +14%.
• Tariff shock +12% on COGS-of-imports: Contribution $17.60. Break-even 1,705 units. +14%. See tariff cost impact.
• All four combined (stressed scenario): Contribution $12.00. Break-even 2,500 units. +67% volume needed just to survive.
• AOV bump +$8 via bundle (offsets): Contribution $27. Break-even 1,111 units. -26%. Why AOV levers dominate.

When to include vs exclude ad spend in break-even

Two views, both legitimate, different purposes:

• Excluding ad spend (classic break-even): Tells you how many units you'd need to sell if marketing were free. Use this for infrastructure decisions — is the cost structure viable before CAC?
• Including ad spend as per-unit CAC (practical break-even): Tells you the real volume target given your current acquisition efficiency. Use this for operational planning.
• Including only "fixed" ad spend (retainers, brand campaigns): Middle ground. Treats performance marketing as variable, brand as fixed.

Run all three views at quarter-end. If "excluding ad" break-even looks impossible, the cost structure itself is broken and you can't out-market your way out.

Frequently asked (operator edition)

My break-even says 1,200 units/mo but we're at 900. How long can we burn? Cash runway = cash on hand / (break-even gap × contribution). If contribution is $22 and gap is 300 units, monthly burn is $6,600. $40K cash = 6 months. Plan accordingly.

Should seasonal brands compute break-even monthly or annually? Annually, with month-by-month cashflow. A Christmas-gift brand may lose money 8 months/year and make all its annual profit in November-December. Monthly break-even is misleading.

How does a raise change break-even? It doesn't mathematically — fixed costs still need to be covered by contribution. But it buys runway to hit break-even volume. Raises buy time, not economics.

Do I include owner salary in fixed cost? Yes — if the business can't pay you a market-rate salary, it's subsidized by you. Model with your real market comp ($80K-$180K for founder roles) even if you're drawing less now.

What about R&D / new product development? Amortize over the expected revenue life of the product (typically 18-36 months). Skip this line if it makes Year 1 look impossible; just know you're borrowing from Year 2 P&L.

Break-even for a new SKU launch? Isolate SKU-level contribution and allocate only incremental fixed cost (tooling, photography, new-SKU-specific marketing). Don't burden a new SKU with company-wide fixed cost.

Is there such thing as a "good" break-even volume? Only relative to your current volume. A break-even at 80% of current volume = 20% margin of safety = OK. At 50% = 50% safety = excellent. At 110% = you're losing money.

How do bundles affect break-even? A bundle is a new SKU with its own AOV and contribution. If bundle AOV is $95 vs single-product $55, bundle contribution is typically $40 vs $22. Shifting 30% of orders to bundles can drop unit break-even 15-20%. Run our bundle pricing calculator.

Disclaimer

Break-even math is a snapshot. Your cost structure shifts with inflation, platform fee changes, and personnel. Re-compute whenever fixed costs change by more than 10% or you introduce a new SKU.