What each sale actuallycontributes.
Gross profit hides the costs that scale with every unit. Contribution margin strips those out and tells you what's left to cover the rent, the salaries, and the ads — and exactly how many units it takes before you stop bleeding fixed costs.
Your numbers
What the customer pays for one unit, before discounts and tax.
Costs that rise with each unit: materials, fulfillment, payment fees, per-unit labor.
Units moved in the period you're measuring.
Costs that don't move with volume: rent, salaries, software, retainers.
The verdict
Contribution margin / unit
$60
CM ratio
60.0%
Total contribution margin
$60,000
Net profit
$40,000
Break-even units
333
Units before profit begins.
Break-even revenue
$33,333
Where the price goes, per unit
Reverse-solve · hit a target profit
Units needed
1,167
Short by
167
At $60 of contribution per unit, hitting $50,000 of net profit on top of $20,000 in fixed costs takes 1,167 units ($116,667 in revenue) — 167 more than you sell now. Break-even sits at 334 units ($33,333); below that, fixed costs aren't covered.
Sensitivity · price moves break-even
What a price change does
| Price per unit | CM ratio | Net profit | Break-even units |
|---|---|---|---|
| $80 (-20%) | 50.0% | $20,000 | 500 |
| $90 (-10%) | 55.6% | $30,000 | 400 |
| $100 | 60.0% | $40,000 | 334 |
| $110 (+10%) | 63.6% | $50,000 | 286 |
| $120 (+20%) | 66.7% | $60,000 | 250 |
Variable cost holds at $40 across this table — only price moves. Notice how a small price change swings the CM ratio, the net profit, and the units you need to break even all at once. Price is the highest-leverage lever you control.
Your move
Your break-even is a number. Let's move it.
Contribution margin $60/unit (60.0% CM ratio) → +$40,000 net profit, break-even at 334 units.
Send me your price, variable cost, and fixed base. I'll trace where contribution leaks — the discount you keep granting, the supplier line you've stopped negotiating, the SKU dragging the blend — and hand you the one change that pulls break-even down the fastest. Free, and the plan is yours whether we work together or not.
Plain English
Contribution margin is the money left to fight with.
Contribution margin is what one sale contributes toward your fixed costs and profit after you subtract the costs that scale with it. Sell a unit for $100 with $40 of variable cost, and that sale contributes $60. Every contributed dollar goes first to covering fixed costs, then — once those are covered — straight to profit.
It's the number gross margin pretends to be. Gross margin lumps in costs that don't actually move per unit, so it flatters thin products and hides the ones that can't carry their own weight. Contribution margin only counts what truly varies with volume, which is why it's the figure operators use to decide what to sell, what to kill, and what to price differently.
The CM ratio — contribution margin as a percentage of price — is the leverage number. A 60% ratio means 60 cents of every revenue dollar is available to cover fixed costs and profit. The higher it is, the fewer units you need to break even, and the faster every extra sale drops to the bottom line. This calculator gives you the per-unit margin, the ratio, total contribution, net profit, and the exact break-even point in both units and revenue.
The formula
Contribution Margin = Price per Unit − Variable Cost per Unit
Price $100, variable cost $40 → contribution margin = $60 per unit, a 60% CM ratio. Sell 1,000 units and you generate $60,000 of total contribution. Against $20,000 of fixed costs that's $40,000 net profit, and you break even at 334 units ($33,400 in revenue) — everything beyond that is profit.
What a healthy CM ratio looks like
Your CM ratio is dictated by how much physical cost rides on every sale, so it splits hard along the digital-versus-physical line. Software keeps 70 cents or more of each dollar because the next copy costs almost nothing; retail hands most of the dollar back to product and fulfillment before contribution even starts. Read these as the floor your model should clear, not a target to chase:
| Model | Typical CM ratio |
|---|---|
| Software / digital | 70-90% |
| Services | 50-70% |
| Retail / ecommerce | 25-45% |
Source: Contribution margin benchmarks by model · 2025
Your contribution margin came back thin. Now what?
CM ratio under ~25%.
Almost every dollar is going to variable cost. You can't out-volume this — at a thin ratio you need a brutal number of units to clear fixed costs. Raise price or cut per-unit cost before you spend a cent acquiring more demand.
Healthy margin per unit, still no profit.
Your fixed costs are eating the contribution. Total CM is real money, but it's all being absorbed before it reaches the bottom line. Cut fixed overhead or push volume past break-even — you're closer than the loss suggests.
Good ratio, low total contribution.
The unit economics are fine; you just aren't selling enough. This is a demand problem, not a pricing one. Put the budget into acquisition — each new unit drops a high share straight toward profit.
Break-even keeps creeping up.
Either fixed costs are climbing or margin is eroding through discounts and rising input costs. Hold the line on price and watch variable cost per unit — a few points of margin moves break-even hard.
Eight ways to lift contribution margin
01Raise price first
A price increase flows almost entirely into contribution because variable cost doesn't move with it. The single highest-leverage change you can make.
02Attack variable cost
Renegotiate suppliers, cut payment-processing fees, and trim fulfillment waste. Every dollar saved per unit is a dollar of pure contribution.
03Bundle to lift the ratio
Pairing a high-margin add-on with the core product raises the blended CM ratio without changing what you sell most.
04Kill the negative-margin SKUs
Products that contribute little or nothing drag the whole line down. Cutting them often raises total contribution even as revenue falls.
05Tier your pricing
A premium tier with the same variable cost captures buyers who'll pay more — pure incremental contribution at almost no extra cost.
06Move volume to high-CM products
Steer merchandising, ads, and sales effort toward the products with the best ratio. Same demand, more contribution.
07Reduce discounting
Every discount comes straight out of contribution, not out of fat. Defend price before you defend the campaign.
08Lower fixed costs to drop break-even
Trimming fixed overhead doesn't change margin per unit, but it lowers how many units you need before profit begins.
The vocabulary
- Contribution margin
- Price per unit minus variable cost per unit: what one sale contributes toward fixed costs and profit.
- CM ratio
- Contribution margin as a percentage of price. The share of each revenue dollar available to cover fixed costs and profit.
- Variable cost
- Cost that rises with each unit sold — materials, fulfillment, payment fees, per-unit labor.
- Fixed cost
- Cost that stays flat regardless of volume — rent, salaries, software, retainers.
- Break-even point
- The volume at which total contribution exactly covers fixed costs: fixed costs ÷ contribution margin per unit.
- Net profit
- Total contribution margin minus fixed costs. What's actually left after everything.
Contribution margin questions, straight answers
Contribution margin is the amount one sale contributes toward fixed costs and profit after subtracting the variable costs of that sale. If you sell a unit for $100 and the variable cost is $40, each sale contributes $60. Once total contribution covers your fixed costs, every additional dollar of contribution is profit.
Keep going
A calculator tells you what. A call tells you what to do about it.
Send me the account behind these numbers. I'll tell you straight where the money's leaking and what I'd fix first — free, and you keep it whether you hire me or not.