Learn SaaS unit economics vocabulary: LTV, CAC, payback period, gross margin, and ARPU/ARPA.
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Customer Acquisition Cost (CAC) is calculated as:
CAC = Sales & Marketing spend / New Customers. It measures how much it costs to acquire one new customer — a key input for unit economics viability.
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LTV (Lifetime Value) represents:
LTV (or CLV) is the total expected revenue from a customer — typically calculated as ARPU x Gross Margin x Average Customer Lifetime.
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A healthy LTV:CAC ratio for a SaaS business is typically:
The SaaS industry benchmark is LTV:CAC > 3:1 — the customer generates at least 3x the acquisition cost. Below 3:1 suggests the business model may not be sustainable.
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CAC payback period measures:
CAC payback period = CAC / (ARPU x Gross Margin). It tells you how many months of revenue are needed to recover what was spent acquiring the customer — shorter is better.
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Gross margin in SaaS measures:
SaaS gross margin = (Revenue - COGS) / Revenue. COGS for SaaS includes hosting, support, and third-party costs. High gross margins (70-80%+) are typical for software businesses.
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David from the Sales team just sent a Slack message: 'Hey team, we're seeing a really high CAC for new users acquired through our referral program. It's currently around $75. We need to figure out why.' What does CAC represent in this context?
CAC, or Customer Acquisition Cost, specifically measures the total expense incurred to acquire *one* new customer. It's calculated by summing all relevant marketing and sales costs associated with bringing in a single user. This Slack message highlights a concern about spending too much to gain each new client – David is rightly investigating.
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You're reviewing a Pull Request description for a feature that adds a premium subscription tier. The PR description reads: 'This update introduces a new pricing model with tiered features and aims to increase MRR by 15%.' What does MRR likely stand for here?
MRR (Monthly Recurring Revenue) is a crucial metric in SaaS businesses. It represents the predictable revenue generated each month from subscriptions – it's the base for assessing the success of pricing changes and growth strategies. The PR description explicitly mentions aiming to *increase* MRR, indicating this is a key focus.
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Sarah, the Head of Product, is discussing unit economics with the engineering team. She says: 'We need to ensure our LTV significantly outweighs our CAC. If it doesn't, we're losing money on every user.' What does LTV (Lifetime Value) primarily represent?
LTV (Lifetime Value) is a critical calculation that predicts the total revenue a single customer will generate throughout their entire relationship with your business. It's not just about initial sales; it accounts for recurring subscriptions, upsells, and potential churn – understanding LTV helps prioritize customer retention efforts.
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During a standup meeting, Ben, the Growth Manager, states: 'Our current gross margin is around 70%.' What does Gross Margin primarily measure in SaaS?
Gross Margin in SaaS is calculated as revenue minus the cost of goods sold (COGS) – typically including things like hosting fees and support costs. It represents the profitability of the core service *before* considering operating expenses or marketing costs. A high gross margin indicates a strong foundation for further growth.
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You receive an API response from the billing system: `{"CAC_Payback_Period": 18}`. What does CAC Payback Period measure?
CAC Payback Period is the time it takes for a company to recoup its initial investment in acquiring a single customer. It's calculated by dividing the total CAC by the average monthly recurring revenue (MRR) generated by that customer. A shorter payback period indicates efficient acquisition strategies.
What will I learn from the "Unit Economics Vocabulary" exercise?
Learn SaaS unit economics vocabulary: LTV, CAC, payback period, gross margin, and ARPU/ARPA.
Is this exercise free to use?
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How many questions are in this exercise?
This set contains 10 multiple-choice questions, each with a detailed explanation shown after you answer.
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No account is required. Your progress bar and score reset each time you reload the page, but you can retry the exercise as many times as you like.
Who is this SaaS Metrics exercise for?
This exercise is built for IT professionals and non-native English speakers who need to read, write, and discuss saas metrics topics confidently at work.
What happens if I answer a question incorrectly?
You will see the correct answer highlighted along with a detailed explanation of why it is correct -- so every wrong answer becomes a learning moment, not just a lost point.
Can I retry this exercise?
Yes -- click "Try again" on the results screen at any time to reset your score and go through all the questions again.
How long does this exercise take to complete?
Most learners finish all 10 questions in under 10 minutes, since each question is answered by clicking a single option.
Where can I find more SaaS Metrics exercises?
See the full SaaS Metrics exercises hub for more vocabulary drills on this topic.
Is this exercise mobile-friendly?
Yes -- the exercise works on any device with a modern browser, including phones and tablets, with no app download required.