Metrics
Contribution Margin
Quick definition
Revenue minus all variable costs of a unit or segment; what each incremental customer or product line contributes before fixed costs.
Contribution margin is revenue minus the variable costs directly tied to producing that revenue, showing what a customer, product line, or channel contributes toward covering fixed costs and profit. It goes a step beyond gross margin by including variable costs that may sit below the gross-margin line, such as variable support or per-transaction costs. Contribution margin is central to unit economics and to deciding which segments, channels, or products actually make money once you strip out shared overhead.
Related metrics terms
ARR (Annual Recurring Revenue)
Annualized value of your subscription revenue at a point in time.
MRR (Monthly Recurring Revenue)
Monthly equivalent of ARR, useful for month-over-month tracking.
Net Revenue Retention (NRR)
Revenue from your existing customer base 12 months later, including expansion and churn.
Gross Revenue Retention (GRR)
NRR without upsell: what you keep before expansion.
See this in action
Insights, guides, and tools where Contribution Margin shows up.
Frequently asked questions
- What is Contribution Margin?
- Contribution margin is revenue minus the variable costs directly tied to producing that revenue, showing what a customer, product line, or channel contributes toward covering fixed costs and profit. It goes a step beyond gross margin by including variable costs that may sit below the gross-margin line, such as variable support or per-transaction costs. Contribution margin is central to unit economics and to deciding which segments, channels, or products actually make money once you strip out shared overhead.
- Why is Contribution Margin important for startups?
- Contribution Margin is a metrics concept that matters for startup founders because it directly affects fundraising readiness, financial decision-making, or operational discipline at the stage where mistakes are expensive to undo. Founders who understand it have a meaningfully easier time in diligence, board meetings, and investor conversations.
- What category does Contribution Margin belong to?
- Contribution Margin is a Metrics term in the StartupCFO finance glossary — alongside other metrics concepts that founders, CFOs, and accountants use in daily startup operations and reporting.
- Where can I learn more about Contribution Margin?
- Beyond this definition, see the related metrics terms below, or explore StartupCFO's insights and tools that put Contribution Margin in context. For specific situations, talk to a fractional CFO who can walk through your numbers.
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