Contribution Margin Calculator

How to use this calculator

1. Enter your numbers in each field above — the calculator updates instantly as you type, so there's nothing to submit.
2. Use your real figures when you have them, or sensible estimates while you're planning. If a field doesn't apply, leave it at zero.
3. Compare the results, then change one input at a time to see how each lever (price, cost, fees, volume) moves the outcome.

When to use this calculator

• Before scaling a product, so you know how much each sale contributes toward fixed costs and profit.
• When deciding whether to add a subscription, tool, or ad budget — and how many sales pay for it.
• When comparing two products to decide which deserves the ad spend.
• Any time you ask 'does one more sale actually help?'

Formula

Contribution = Price − (Product + Shipping + Packaging + Fee) · Margin % = Contribution ÷ Price × 100 · Break-even sales = Fixed costs ÷ Contribution

Worked example

$35 price, $10 + $5 + $1.50 variable, 10% + $0.30 fee, $500 fixed.

1. Fee = 3.50 + 0.30 = $3.80
2. Contribution = 35 − 16.50 − 3.80 = $14.70
3. Break-even = 500 ÷ 14.70 ≈ 34

Answer: $14.70 per sale; ~34 sales cover $500 fixed

How it works

Expert tips

• Negative contribution can't be fixed by volume. Fix price or costs first.
• Use contribution, not gross margin, when comparing products with different shipping profiles.
• Divide any new fixed cost by contribution per sale — that's the extra sales it needs to earn.
• Recheck after fee or postage increases; contribution erodes quietly.

How to interpret your results

• Dollar values are shown per sale, per order, or per item unless a result is explicitly labelled monthly, weekly, or daily.
• Percentages (margin, ROI, conversion rate) are easier to compare across products and price points than raw dollars — use them when you benchmark.
• A positive result means you're ahead after the costs and fees you entered. A negative result means the current numbers don't work — change a lever (raise price, cut a cost, lower ad spend) and recalculate.
• Treat the output as a planning estimate, not a guarantee. Fees, taxes, and conversion rates shift over time — re-run the numbers whenever a key input changes.

Common mistakes

• Confusing contribution with net profit — fixed costs aren't subtracted yet.
• Ignoring the fee % on the sale price.
• Setting a fixed-cost target you can't actually hit at your volume.

Related Guides

Go deeper with plain-English guides on the same topic.

• What Is a Good Profit Margin?

  What counts as a healthy profit margin — and how it changes depending on what you sell and where.

  Read guide →

• What Is A Good Profit Margin? Complete Small Business Profit Margin Guide

  A 2026 profit margin guide — gross vs net vs contribution, what counts as a good margin, healthy benchmarks by industry and platform, formulas, and improvement strategies.

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• Pricing Psychology Explained: 25 Strategies That Increase Sales

  A 2026 pricing psychology guide — what it is, why it works, 25 specific techniques with examples, platform-specific applications, before/after scenarios, and ethics.

  Read guide →

• How to Price Handmade Products

  A simple formula for pricing handmade work that covers materials, labor, overhead, and profit.

  Read guide →

FAQ

What's a good contribution margin?

40%+ is common for handmade and digital. 20–30% is more typical for physical goods and reselling.

How is it different from gross margin?

Gross margin subtracts only product cost. Contribution subtracts every variable cost per sale, including fees and shipping.

What numbers do I need to start?

Your sale price and every variable cost per sale — product, shipping you pay, packaging, fee percentage, and fixed fee. Add monthly fixed costs if you also want a break-even sales count.

What counts as a variable cost versus a fixed cost?

Variable costs happen because of the sale — product, packaging, postage, fees. Fixed costs happen anyway — rent, subscriptions, insurance. Contribution subtracts only the variable ones.

Why does contribution margin matter before scaling?

Scaling multiplies contribution, not revenue. If contribution per sale is thin or negative, more ad spend or more inventory simply multiplies the problem.

How do I use the break-even sales number?

It's how many sales cover your monthly fixed costs. Anything beyond that is profit. If it's more than you normally sell, cut fixed costs or raise the price before scaling.

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