Comparison
ARR vs MRR: Key Differences Explained
ARR (Annual Recurring Revenue) and MRR (Monthly Recurring Revenue) both measure a SaaS company's recurring revenue — MRR tracks it monthly, ARR annualizes it. MRR is better for tracking growth momentum month-to-month; ARR is the standard metric for investor conversations and valuations.
What is ARR?
ARR (Annual Recurring Revenue) is the annualized value of a company's recurring revenue from subscriptions and contracts. It normalizes all recurring revenue to a 12-month figure, making it the standard benchmark for SaaS company size and valuation.
Formula: ARR = MRR × 12 (for monthly subscriptions) or the sum of all annual contract values.
ARR is used for investor reporting, fundraising conversations, and revenue multiples. When a VC says a company is 'doing $5M ARR,' they mean the company is generating revenue at a $5M annual run rate from recurring sources.
Example: A SaaS company with 100 customers each paying $5,000/year has $500K ARR. If they add 20 more customers next month, ARR jumps to $600K.
What is MRR?
MRR (Monthly Recurring Revenue) is the total normalized recurring revenue a company generates each month. It's the most operationally useful metric for tracking growth, churn, and expansion on a short time cycle.
MRR breaks down into components that tell a rich story: New MRR (from new customers), Expansion MRR (from upgrades), Contraction MRR (from downgrades), and Churned MRR (from cancellations). Together these drive Net MRR growth.
Formula: MRR = Number of customers × Average monthly subscription revenue.
MRR is the pulse check of a SaaS business. Founders should review it weekly or monthly. ARR is how you communicate with investors; MRR is how you run the business.
Example: A company with 200 customers at $250/month has $50K MRR = $600K ARR.
Key Differences
| Feature | ARR | MRR |
|---|---|---|
| Time horizon | Annualized (12-month view) | Monthly snapshot |
| Primary use | Investor reporting, valuations, fundraising | Operational tracking, team dashboards |
| Formula | MRR × 12 or sum of annual contracts | Customers × Average monthly subscription |
| Growth tracking | Year-over-year comparisons | Month-over-month momentum |
| Includes one-time revenue? | No — recurring only | No — recurring only |
| Churn visibility | Lower — annual smoothing hides monthly swings | High — churn shows up immediately each month |
| Benchmark stage | $1M ARR = seed/early Series A milestone | $100K MRR = common early-stage milestone |
When Founders Choose ARR
- →Talking to investors — ARR is the standard language in fundraising conversations
- →Calculating revenue multiples for valuation discussions
- →Reporting year-over-year growth to the board
- →Comparing your company against benchmark data (e.g., 'T2D3' growth path)
When Founders Choose MRR
- →Tracking growth momentum week-to-week or month-to-month
- →Running churn and expansion analysis — MRR breaks down by cohort
- →Setting sales targets and growth rate goals for the current quarter
- →Early-stage companies where annual contracts aren't yet common
Example Scenario
A founder is preparing for a Series A. She tells investors: 'We're at $2.4M ARR, growing 15% month-over-month.' Internally, her team tracks MRR: $200K MRR in January, rising to $230K in February after onboarding two new enterprise contracts. Churned MRR was $8K (one SMB customer). Expansion MRR was $38K (two upgrades). Net new MRR: +$30K.
The ARR ($2.4M) communicates scale. The MRR breakdown tells the team exactly where growth is coming from — and where it's leaking.
Common Mistakes
- 1Including one-time fees, professional services, or non-recurring revenue in ARR or MRR — these inflate the number and mislead investors
- 2Converting monthly contracts to ARR by multiplying, then including annual contracts at face value — this double-counts revenue
- 3Confusing 'run rate ARR' with actual trailing twelve months revenue — ARR is a forward-looking snapshot, not historical revenue
- 4Ignoring MRR churn because 'ARR looks fine' — annual smoothing can hide monthly churn spikes that signal trouble
Which Matters More for Early-Stage Startups?
Both. Use MRR to run your business; use ARR to talk to investors. The real mistake is running on ARR when you should be watching MRR — monthly churn and expansion tells you what's actually happening before it shows up in annual numbers. Most early-stage SaaS founders should obsess over MRR until they have a mix of monthly and annual contracts, then transition to ARR as their primary reporting metric.