MRR Calculator: Track SaaS Recurring Revenue, Churn, and Unit Economics

Monthly Recurring Revenue is the number that most SaaS founders care about most, but tracking MRR correctly means tracking the five components that make it move: new, expansion, contraction, churn, and starting base. Ignore any one of them and your “MRR is growing” headline obscures what’s actually happening in your business. This calculator shows the full picture — including the unit economics that determine whether your growth is actually sustainable.

You can also project forward 24 months. Not because the projection will be right, but because seeing what your business looks like if current motion holds forces a useful question: is this trajectory acceptable, or do we need to change something now?

How to Use This Calculator

Starting MRR is your recognized recurring revenue at the start of the measurement period. Include all active subscriptions, retainers, and any monthly-billed annual contracts prorated to monthly.

New MRR is revenue from brand new customers added this month — not renewals, not upgrades, purely new logos.

Expansion MRR is additional revenue from existing customers who upgraded, added seats, or bought add-ons.

Contraction MRR is revenue lost from existing customers who downgraded — still customers, paying less.

Monthly gross churn is the percentage of your starting MRR that canceled entirely. A 3% churn rate means 3% of your customers left this month. Not 3% annually — monthly. 3%/month annualizes to roughly 31% annual churn, which is extremely high.

For unit economics: ARPU is your average revenue per user per month, CAC is your blended customer acquisition cost (total sales + marketing spend ÷ new customers acquired), and gross margin is revenue minus direct costs as a percentage of revenue.

The Metrics That Actually Matter

Net Revenue Retention (NRR) is the single most important SaaS health metric. It measures what happens to a cohort of customers’ revenue over time — purely from expansion, contraction, and churn, excluding new logos. NRR above 100% means your existing customer base is growing without acquiring a single new customer. Elite companies like Snowflake and Datadog sustain 130%+ NRR.

Below 100% NRR means you’re running a leaky bucket. Every month, your base shrinks unless new acquisition replaces the losses. Growth looks fine on the surface, but the economics are fragile. One bad acquisition quarter and the whole thing contracts.

LTV:CAC ratio benchmarks: below 1.0 means every customer is a net loss over their lifetime — the business literally can’t scale. 1–3 means you’re recovering your acquisition cost but margins are thin. Above 3 is the standard “healthy” threshold. Above 5 means you’re underinvesting in growth (you could profitably spend more on acquisition).

CAC payback under 12 months is generally considered elite. Under 18 is healthy. 18–24 is acceptable with strong retention. Above 24 creates dangerous cash dynamics — you’re fronting a lot of money and waiting years to get it back.

The Rule of 40 combines growth rate plus profit margin. Score above 40 and investors consider you efficient. Below 40 means you’re either growing too slowly or burning too much — one of those needs to change.

Real Example: Diagnosing Slow Growth

A SaaS founder reports her MRR grew from $85,000 to $87,500 last month — a 2.9% increase that looks respectable. But the component breakdown tells a different story:

• Starting MRR: $85,000
• New MRR: $8,000 (9.4% of base)
• Expansion: $1,200
• Contraction: $800
• Churn (4.2%): $3,570
• Net new: $4,830 — but wait, that should be $8,000 + $1,200 – $800 – $3,570 = $4,830

She’s acquiring $8K/month in new MRR but losing $3,570 to churn plus another $800 to contraction — $4,370 in losses against $9,200 in gains. Her NRR is about 94% — a leaky bucket. At current churn, her existing customer base loses $44K/year. She needs to fix retention before accelerating acquisition spend.

The calculator projects her 24-month MRR at roughly $125,000 assuming nothing changes. But if she cuts churn from 4.2% to 2.5%, that same acquisition motion puts her at $155,000+ instead. Reducing churn by 1.7 percentage points is worth $360K in projected ARR over two years. That realization changes where she allocates engineering resources next quarter.

Related Concepts You Should Know

Gross vs net churn. Gross churn is revenue lost from cancellations only. Net churn subtracts expansion. You can have 5% gross churn and -2% net churn (meaning expansion fully offsets cancellations). Investors care about both; most SaaS dashboards show gross churn because it’s harder to game.

Logo churn vs revenue churn. Losing 10% of customers is a different problem depending on which customers churned. If your biggest customers stay and your smallest leave, revenue churn is lower than logo churn. If your biggest customers churn, the reverse. Both matter — watch both.

Cohort analysis. MRR snapshots are lagging. Cohort analysis tracks what happens to revenue from customers who signed up in the same month over time. A deteriorating cohort curve — where each month’s cohort retains less at 3 months, 6 months, 12 months — is an early warning signal that the headline MRR number will miss.

Deferred revenue vs MRR. Annual subscriptions billed upfront create deferred revenue on your balance sheet — cash you’ve received but not yet “earned” from an accounting standpoint. Recognize it evenly across the contract period. This matters for your financial statements but your MRR calculation should use the prorated monthly value regardless of billing cadence.

If you want to model the cost side of your SaaS business alongside revenue, the Business Expense Tracker pairs naturally with this calculator — knowing your operating costs makes your Rule of 40 calculation precise rather than estimated.

Frequently Asked Questions

What’s a good monthly churn rate for SaaS?

Under 2% monthly is elite. 2–5% is healthy for most SMB-focused SaaS. Above 5% monthly is concerning and suggests a product-market fit or onboarding problem. Enterprise SaaS typically runs 0.5–1.5% monthly churn due to longer contracts and higher switching costs. Note that these monthly rates compound aggressively — 5%/month is ~46% annual churn.

How do I calculate MRR for annual contracts?

Prorate to monthly: a $1,200/year contract contributes $100/month to MRR. Don’t count the full $1,200 as MRR in the billing month. This is the standard SaaS convention and matters for consistent NRR and churn calculations.

Should I include one-time fees in MRR?

No. Implementation fees, setup charges, and one-time purchases are not recurring and should not be in MRR. They’re separate revenue lines. Including them inflates MRR and distorts your churn and growth rate calculations.

What’s the difference between MRR and ARR?

ARR is MRR × 12. It’s a common investor metric for businesses with annual contracts, and it normalizes across different billing periods. For early-stage companies mostly on monthly plans, MRR is the more meaningful operational metric. For companies predominantly on annual contracts, ARR may better reflect contracted backlog.

Why is my projected MRR declining even though I’m adding new customers?

Your churn rate is consuming new MRR faster than acquisition creates it. If your starting MRR is $100K and your churn rate is 6%, you’re losing $6K/month just to stand still. You need more than $6K in new MRR every month before you see net growth. Check your churn figure — 6% monthly is extremely high and is the most common culprit.

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Andy Gaber

Andy Gaber is the founder of Digital Dashboard Hub, a suite of 255+ interactive financial, productivity, and wellness tools. He built DDH after getting frustrated with financial apps that gave outputs without context. Follow along for tool tutorials, revenue analytics breakdowns, and honest takes on personal finance.