Monthly Recurring Revenue (MRR) and Annual Recurring Revenue (ARR) are the bedrock financial metrics for any subscription-based business, SaaS company, or any organization that generates predictable, recurring income from customers. Unlike traditional one-time revenue, MRR and ARR capture only the normalized, recurring portion of your revenue — the part you can count on repeating in future periods — making them far more useful for forecasting, valuation, and operational planning. MRR is the total recurring revenue your business generates in a single month, normalized to remove the distorting effects of annual prepayments or multi-year contracts. If a customer pays $1,200 upfront for an annual plan, their MRR contribution is $100 (not $1,200), because that is the economically meaningful monthly rate. ARR is simply MRR multiplied by 12, providing an annualized view that is easier to compare across quarters and years. MRR is not a single number — it is best understood as a composition of several components. New MRR is revenue from brand-new customers this month. Expansion MRR is additional revenue from existing customers who upgraded, added seats, or purchased add-ons. Churned MRR is revenue lost from customers who cancelled. Contraction MRR is revenue lost from customers who downgraded. Net New MRR is the sum of all these components. This decomposition — often called the MRR waterfall — is one of the most powerful tools for understanding the health and momentum of a subscription business. For investor reporting, ARR above $1M is often the threshold at which a SaaS startup is considered to have demonstrated initial product-market fit. ARR above $10M signals meaningful scale. Most public SaaS companies report ARR in their quarterly results, and ARR growth rate is a primary valuation driver — public SaaS companies often trade at revenue multiples of 5x–15x ARR or higher during growth phases. Investors and operators also distinguish between Committed ARR — the annualized value of all active subscription contracts, including those paid annually upfront — and Run-Rate ARR, which is simply current MRR times twelve. For companies with a mix of monthly and annual contracts, these two figures can diverge, and being precise about which you are reporting prevents misunderstandings in financial discussions.
MRR = Sum of all active customers × their normalized monthly subscription rate ARR = MRR × 12 Net New MRR = New MRR + Expansion MRR − Churned MRR − Contraction MRR
- 1List every active paying customer and their subscription plan at the end of the measurement month.
- 2Normalize all subscriptions to a monthly rate: annual plan customers contribute (annual price ÷ 12) per month; monthly plan customers contribute their monthly rate directly.
- 3Sum all normalized monthly rates to get total MRR.
- 4Multiply MRR by 12 to get ARR — a useful annualized figure for investor communications and year-over-year comparisons.
- 5Break MRR into its components: track New MRR (new customers), Expansion MRR (upgrades and upsells), Churned MRR (cancellations), and Contraction MRR (downgrades).
- 6Calculate Net New MRR as the sum of new and expansion minus churned and contraction — this reveals whether you are growing or shrinking in net terms.
- 7Track MRR growth rate month-over-month and quarter-over-quarter to identify acceleration or deceleration trends.
At this ARR level, the startup is approaching the $100K milestone often cited as proof of initial traction.
A project management SaaS startup has three pricing tiers. The Starter tier (15 customers × $99) contributes $1,485 MRR. The Pro tier (8 customers × $299) contributes $2,392 MRR. The Business tier (2 customers × $999) contributes $1,998 MRR. Total MRR = $1,485 + $2,392 + $1,998 = $5,875. ARR = $5,875 × 12 = $70,500. The startup is approaching the $100K ARR milestone, which many seed-stage investors consider a meaningful early traction signal.
Expansion MRR of $3,500 indicates a healthy upsell motion offsetting $2,500 in churn and contraction.
A B2B SaaS company starts June with $50,000 MRR. During June they onboard new customers generating $8,000 in New MRR, upsell existing customers for $3,500 in Expansion MRR, lose $2,000 from 4 churned customers, and see $500 in plan downgrades. Net New MRR = $8,000 + $3,500 − $2,000 − $500 = $9,000. Ending MRR = $50,000 + $9,000 = $59,000. Month-over-month growth is 18%, an exceptional rate. ARR at month end = $708,000 — nearing the important $1M ARR milestone.
Annual plan customers are normalized to $39.17/month, not their full $470 upfront payment.
A subscription analytics tool has two plan types. The 30 monthly customers pay $49/month directly, contributing $1,470 MRR. The 20 annual customers pay $470 upfront for the year, but their normalized monthly contribution is $470 ÷ 12 = $39.17 per customer, or $783 total MRR. Total MRR = $1,470 + $783 = $2,253. ARR = $27,036. Note that in the month the annual customers pay, the company receives $9,400 in cash — but only $783 of that is recognized as MRR. The remaining cash is deferred revenue, recognized monthly as the subscription term elapses.
150% ARR growth qualifies as 'triple-triple' territory, placing this company in the top decile of SaaS growth rates.
A Series B SaaS company reporting to investors shows ARR growing from $2.4M to $6.0M over 12 months — a 150% growth rate. Monthly MRR at the current rate is $6,000,000 ÷ 12 = $500,000. At this growth rate, the company would reach $10M ARR within 8 months if growth holds. For context, the SaaS community's 'T2D3' framework (triple, triple, double, double, double ARR) identifies this growth trajectory as benchmark-level performance for venture-backed SaaS companies. At $6M ARR with 150% growth, this company would attract significant Series C investor interest.
Investor board reporting and fundraising pitch decks as the primary revenue metric
Financial modeling and cash flow forecasting for subscription businesses
Calculating company valuation based on ARR multiples
Setting and tracking sales team quotas and growth targets
Measuring the health of pricing and packaging changes
In practice, this edge case requires careful consideration because standard assumptions may not hold. When encountering this scenario in mrr & arr calculator calculations, practitioners should verify boundary conditions, check for division-by-zero risks, and consider whether the model's assumptions remain valid under these extreme conditions.
In practice, this edge case requires careful consideration because standard assumptions may not hold. When encountering this scenario in mrr & arr calculator calculations, practitioners should verify boundary conditions, check for division-by-zero risks, and consider whether the model's assumptions remain valid under these extreme conditions.
In practice, this edge case requires careful consideration because standard assumptions may not hold. When encountering this scenario in mrr & arr calculator calculations, practitioners should verify boundary conditions, check for division-by-zero risks, and consider whether the model's assumptions remain valid under these extreme conditions.
| ARR Range | Stage | Target YoY Growth | Typical Funding Round |
|---|---|---|---|
| $0–$100K | Pre-revenue / Seed | 15–25% MoM | Pre-seed / Seed |
| $100K–$1M | Early traction | >100% YoY | Seed / Series A |
| $1M–$5M | Initial scale | 100–200% YoY | Series A / B |
| $5M–$10M | Growth | 80–150% YoY | Series B |
| $10M–$30M | Scaling | 60–100% YoY | Series B / C |
| $30M–$100M | Hypergrowth | 40–80% YoY | Series C / Growth |
| $100M+ | Pre-IPO / Public | >20–40% YoY | Growth Equity / IPO |
What is the difference between MRR and monthly revenue?
MRR and total monthly revenue are often confused but measure distinctly different things. Monthly revenue includes all cash collected in a month — one-time setup fees, professional services, one-time add-on purchases, variable usage charges, and the full cash amount of annual prepayments. MRR includes only the normalized, recurring portion of that revenue — the predictable, contractually committed subscription amount that repeats each month. This distinction matters because investors and operators use MRR to forecast future revenue, model growth trajectories, and assess business value. Including non-recurring items in MRR overstates its predictive value and makes the business look artificially larger. Always strip out one-time fees and normalize annual prepayments when calculating MRR.
How do I handle usage-based or variable billing in MRR?
Usage-based pricing presents a genuine challenge for MRR calculation because, by definition, the revenue is variable rather than predictable. The most common approach is to use a baseline contracted minimum as the MRR contribution and treat usage above that minimum as non-recurring revenue. For companies with predominantly usage-based models (like Twilio, Snowflake, or AWS), some operators use a trailing-12-month average of monthly revenue per customer as a proxy for MRR, while explicitly noting that it is an estimate rather than a committed recurring figure. Another approach is to calculate 'annualized run rate' (ARR) from the most recent month's total revenue multiplied by 12, with disclosure that it includes variable components. Whichever method you choose, be transparent and consistent in how you define and report MRR.
What is a healthy MRR growth rate?
MRR growth rate benchmarks depend heavily on company stage and starting ARR base. Early-stage companies (under $1M ARR) should target 15–20% month-over-month MRR growth or higher to demonstrate strong product-market fit — at 20% MoM growth, a company doubles its MRR in under 4 months. Mid-stage companies ($1M–$10M ARR) typically target 10–15% MoM or 100–200% year-over-year. Growth-stage companies ($10M+ ARR) are benchmarked against the 'Rule of 40' and may grow at 40–100% annually while also managing profitability. The SaaS community's 'T2D3' benchmark (Triple ARR two years in a row, then Double three years in a row) is the gold standard for venture-backed SaaS companies aiming for a $100M+ ARR outcome.
Should professional services revenue be included in ARR?
Professional services revenue — implementation, training, consulting, customization — should generally not be included in ARR or MRR. ARR is designed to capture only predictable, recurring subscription revenue. Professional services are by nature non-recurring, project-based engagements that do not repeat reliably. Including them would inflate ARR in periods of heavy implementation activity and make it an unreliable predictor of future revenue. Most SaaS companies report professional services revenue separately from subscription ARR, both in internal metrics and in investor communications. The exception is if your company offers a recurring managed services contract with a fixed monthly retainer — that predictable recurring element could reasonably be included in MRR.
What is the difference between ARR and run rate revenue?
Run rate revenue is a more informal, forward-looking estimate: you take the most recent month's total revenue and multiply by 12 to get an annualized projection. ARR is a more precise metric that counts only the contractually committed, recurring subscription base. They are similar but not identical. A company with $100,000 in subscription MRR, $20,000 in one-time setup fees, and $10,000 in professional services has an ARR of $1,200,000 but a run rate of $1,560,000. ARR is the preferred metric in SaaS reporting because it excludes the noise of non-recurring items and gives a cleaner picture of the sustainable revenue base. When you see ARR cited in a SaaS company's press release or investor materials, it almost always means the subscription-only recurring revenue annualized.
How does churn affect MRR over time?
Churn has a compounding negative effect on MRR over time that can be surprisingly devastating. If a company with $100,000 MRR adds no new customers but experiences 5% monthly churn, after 12 months its MRR will have fallen to approximately $54,000 — nearly half its starting value. At 2% monthly churn, MRR falls to $78,000 after 12 months. At 1% monthly churn, it falls to $88,000. This illustrates why even 'low' churn rates are significant over time, and why the entire SaaS industry focuses so intensely on retention. The bright side: positive expansion MRR from upsells can offset churn and produce net MRR growth even without any new customer acquisition — the goal of achieving 'negative churn' through expansion revenue exceeding lost revenue.
What ARR milestones are significant for startup investors?
Certain ARR milestones carry outsized significance in the venture capital ecosystem because they signal progression through distinct phases of company development. $100K ARR (roughly $8,300 MRR) typically marks the transition from idea to initial traction and is often the minimum threshold for credible seed fundraising. $1M ARR signals product-market fit and is the typical benchmark for a Series A round in SaaS. $3M–$5M ARR often supports Series B fundraising, demonstrating the ability to scale. $10M ARR is considered the beginning of meaningful scale and is a common target for Series B companies. $50M ARR and $100M ARR are thresholds that attract growth equity and pre-IPO interest. These milestones compress or expand based on market conditions and investor appetite at any given time.
Pro Tip
Build a monthly 'MRR waterfall' chart tracking new, expansion, churned, and contraction MRR side by side. This visualization — standard in investor board decks — immediately reveals whether your growth is being driven by efficient new customer acquisition, by powerful upsell motion, or by retention improvements. The ratio of expansion MRR to churned MRR is one of the best early indicators of whether a SaaS business will eventually achieve negative net churn.
Did you know?
Slack grew from $0 to $7.1M MRR ($85M ARR) in just the first 12 months after its public launch in August 2013 — one of the fastest MRR growth trajectories in SaaS history, achieved almost entirely through viral, bottom-up adoption without a traditional sales team.