Break-Even Analysis Explained
Your break-even point tells you exactly how much you need to sell to stop losing money. Most small sellers never calculate it — and discover, during a slow month, that they were below break-even the whole time. This guide explains the method from the ground up.
What break-even means
The break-even point is the sales level where total revenue exactly equals total costs — neither profit nor loss. Expressed in units ("sell 120 candles/month") or in revenue ("$2,880/month"). It turns vague hope into a concrete monthly target.
Why it matters
Sets a clear goal, validates or kills a business idea before you invest, exposes pricing problems instantly, frames every cost decision (a $39/month tool requires X extra sales), protects cash flow, and is the foundation of profit planning.
Fixed costs
Costs that don't change with sales volume: platform subscriptions, software, rent, amortized equipment, insurance, and one-time upfront costs (cover design for a KDP book) you must recover. Time-based, not sale-based. Total them honestly — missing a recurring expense makes break-even look lower than it really is.
Variable costs
Costs that rise with every sale: COGS/materials, shipping and packaging, platform transaction and payment fees (Etsy ~9.5% + $0.45; eBay ~13.6% + $0.40; Shopify ~2.9% + $0.30), per-unit labor, per-sale ad spend. Sale-based, not time-based.
Contribution margin
Contribution Margin per Unit = Selling Price − Variable Cost per Unit. It's what each sale contributes toward fixed costs (and then profit). Contribution Margin Ratio = CM per unit ÷ Selling Price.
The break-even formulas
Break-Even Units = Fixed Costs ÷ Contribution Margin per Unit.
Break-Even Revenue = Fixed Costs ÷ Contribution Margin Ratio.
Units for Target Profit = (Fixed Costs + Target Profit) ÷ Contribution Margin per Unit. Always round units up.
How pricing changes break-even
A small price increase widens contribution margin and drops the units required to break even — often by a lot. Cutting price to "compete" raises break-even and traps you into needing more volume just to stand still. Model the impact before changing price.
Worked examples
Etsy candle at $24, $50 fixed, $14.73 variable → CM $9.27 → break-even ≈ 6 candles/month (~$130).
eBay store $28/month + variable fees → break-even in low double-digit units.
KDP book one-time costs $300, royalty $2.85 → 105 copies to break even.
Shopify with ad budget: $369 fixed, $45 product, $22.61 variable → 17 units/month (~$765).
Common mistakes
Forgetting a recurring expense, mixing fixed and variable costs, leaving your own labor at $0, treating one-time costs as monthly, rounding break-even down, and never recalculating after a cost changes.
Frequently asked questions
- What's the difference between fixed and variable costs?
- Fixed costs (rent, subscriptions) stay the same regardless of sales. Variable costs (materials, shipping, platform fees) rise with each sale.
- How is contribution margin different from profit margin?
- Contribution margin is per unit — selling price minus variable cost. Profit margin is overall — net profit divided by revenue across the whole business.
- How does a price change affect break-even?
- Strongly. A higher price widens contribution margin and lowers the units needed; a lower price does the opposite. Small price changes often swing break-even by 20–40%.
- Should I include my own labor in variable cost?
- Yes if you want a realistic margin. Leaving labor at $0 makes products look more profitable than they are and traps you working for free.
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