Revenue growth is the clearest signal of business health, but the timeframe you measure it over changes what the number tells you. ARR growth rate and MRR growth rate both track how fast recurring revenue is expanding, yet each answers a different question. Choosing the wrong one can lead to decisions based on an incomplete picture.
This comparison breaks down both metrics, explains how they differ, and helps you decide which one belongs in your reporting.
What is ARR growth rate?
ARR growth rate measures how much a company's Annual Recurring Revenue has grown over a given period, expressed as a percentage.
Formula:
ARR Growth Rate (%) = ((ARR at End of Period - ARR at Start of Period) / ARR at Start of Period) × 100
For example, if your ARR was $1,200,000 at the start of the year and $1,800,000 at year-end, your ARR growth rate is 50%.
ARR is the annualized value of recurring revenue, typically derived from subscription contracts. It smooths out short-term fluctuations and gives leaders a stable, long-horizon view of the business.
What is MRR growth rate?
MRR growth rate measures how much a company's Monthly Recurring Revenue has grown from one month to the next, expressed as a percentage.
Formula:
MRR Growth Rate (%) = ((MRR at End of Month - MRR at Start of Month) / MRR at Start of Month) × 100
For example, if your MRR was $80,000 in January and $88,000 in February, your MRR growth rate is 10% for that month.
MRR captures the current state of recurring revenue at monthly resolution. Because it updates every 30 days, it reflects changes in new sales, expansions, contractions, and churn almost immediately.
Key differences at a glance
| Factor | ARR growth rate | MRR growth rate |
|---|---|---|
| Time horizon | Annual | Monthly |
| Best for | Strategic planning, investor reporting | Operational monitoring, sales pacing |
| Sensitivity to change | Low — smooths short-term swings | High — reflects changes quickly |
| Typical audience | Board, investors, executives | Revenue operations, finance, sales leadership |
| Contract context | Annual or multi-year contracts | Monthly contracts or high-frequency billing |
| Volatility | Lower | Higher |
How ARR growth rate and MRR growth rate relate
MRR and ARR are mathematically linked. In its simplest form, ARR is MRR multiplied by 12. That means ARR growth rate is, in theory, a lagged and smoothed version of what MRR growth has been doing over the year.
In practice, the two metrics can tell very different stories at the same moment.
A company might show strong MRR growth in Q1 because of a seasonal sales push, then flatten in Q2. ARR growth rate, measured at year-end, would blend both periods into a single number. The annual figure might look healthy even if momentum stalled mid-year.
Conversely, a company investing heavily in annual contracts might see ARR jump significantly at renewal cycles while MRR stays flat or moves in smaller increments throughout the year.
This is why tracking both, rather than choosing one, often gives the most complete picture. For a deeper look at how these two measures compare, see MRR vs ARR.
When to use ARR growth rate
ARR growth rate is the right metric when the conversation is about the long-term trajectory of the business.
Use ARR growth rate when you are:
Reporting to investors or a board who need a stable, year-over-year view of business performance
Benchmarking against industry peers, since ARR is the standard unit for SaaS metrics comparisons
Planning headcount, infrastructure, or budgets that require annual revenue assumptions
Evaluating cohort performance over multi-year subscription windows
Assessing the impact of pricing changes that take time to flow through the customer base
ARR growth rate is less useful when you need to catch problems early. A churn spike in October might not show up clearly in an annual figure until it's too late to course-correct.
When to use MRR growth rate
MRR growth rate is the right metric when you need to act on what's happening now.
Use MRR growth rate when you are:
Monitoring sales performance against monthly targets and quotas
Detecting churn or contraction before it compounds into a larger problem
Evaluating the impact of a new campaign, pricing test, or product launch within weeks, not quarters
Managing cash flow for businesses with monthly billing cycles
Running a younger company where annual patterns haven't yet stabilized and monthly signals are more actionable
MRR growth rate is less useful for board-level storytelling or investor benchmarking, where annual figures carry more weight and are more widely understood.
A practical example: Reading both metrics together
Consider a SaaS company with the following data:
| Month | MRR | MRR growth rate |
|---|---|---|
| January | $100,000 | — |
| February | $108,000 | 8.0% |
| March | $114,480 | 6.0% |
| April | $117,914 | 3.0% |
| May | $118,000 | 0.1% |
| June | $116,820 | -1.0% |
At the end of June, ARR stands at approximately $1,401,840 (June MRR × 12). Compared to the annualized January figure of $1,200,000, ARR growth rate is roughly 16.8% — a number that looks solid.
But MRR growth rate tells a different story. Growth decelerated from 8% to near zero, then turned negative. The ARR growth rate masks a trend that MRR growth rate surfaces clearly.
A team watching only ARR growth rate would miss the warning. A team watching only MRR growth rate might underreact to how strong the first two months were. Together, the metrics give a fuller picture.
Common mistakes when using these metrics
Annualizing MRR growth rate without context. Multiplying a strong January MRR growth rate by 12 to project annual growth assumes that rate holds every month. It rarely does.
Comparing ARR growth rates across different contract structures. A company with mostly monthly contracts and one with mostly annual contracts will calculate ARR differently, making direct comparisons misleading.
Ignoring the components of MRR change. MRR growth rate is a net figure. It combines new MRR, expansion MRR growth rate, contraction MRR, and churned MRR. A flat MRR growth rate could mean everything is stable, or it could mean strong new sales are masking high churn.
Using ARR growth rate to make short-cycle decisions. Annual figures update slowly. If you're adjusting a sales campaign or responding to a competitive threat, ARR growth rate won't give you the resolution you need.
Which metric matters more?
Neither metric is superior. They operate at different timescales and serve different audiences.
If your primary concern is where the business is heading over the next 12 to 36 months, ARR growth rate is the right lens. If your concern is whether this month's revenue engine is working, MRR growth rate is the signal to watch.
Most subscription businesses benefit from tracking both: MRR growth rate as an operational early-warning system, and ARR growth rate as the strategic headline for planning and investor communication.
