MRR vs. ARR: Which to Use and When

MRR vs ARR is a question of time frame more than substance: monthly recurring revenue shows the recurring revenue you earn in a month, and annual recurring revenue is the same figure scaled to a year. Founders use both, often interchangeably, and the confusion starts when they differ because of how contracts are counted. A $12,000 annual contract is $1,000 of MRR and $12,000 of ARR, and it is neither $12,000 of revenue in the month it is signed nor $12,000 of cash when the customer pays. This guide defines both, explains how to normalize different contract types, builds an MRR bridge with checked arithmetic, says when to use each one, and lists the errors that make recurring revenue figures unreliable to investors and to your own team. It belongs to unit economics and budgeting and forecasting, and leads to annual recurring revenue and net revenue retention.

The definitions

Monthly recurring revenue (MRR) is the normalized monthly value of all active recurring subscriptions at a point in time. Annual recurring revenue (ARR) is the normalized annual value of those same subscriptions, so for a business with monthly normalization, ARR = MRR × 12.

Recurring means the revenue is contracted to repeat on a predictable basis: subscriptions, licenses, maintenance and support agreements, and minimum commitments. It excludes one-time items such as implementation fees, hardware sales, training and one-off services. Usage-based revenue is a gray area: committed minimums count as recurring, and variable usage above the minimum is usually reported separately or averaged over a trailing period, with the method disclosed.

Normalizing contracts

The goal is to express every contract as a monthly amount, regardless of how it is billed.

Check: 90,000 / 36 = 2,500, and 3,000 / 3 = 1,000. A multi-year deal is normalized by the full term, not by its first-year invoice. For discounts, many companies use the current contracted price paid by the customer, and some use the list price: whichever you use, apply it consistently and say which one it is.

An MRR bridge

An MRR bridge, or waterfall, explains how MRR moved over a period. It is the best single exhibit for showing the health of a subscription business. Hypothetical month:

Check: 200,000 + 14,000 + 6,000 - 2,500 - 5,500 = 212,000. Net new MRR is $12,000, a growth rate of 6.0 percent for the month (12,000 / 200,000). ARR at the end of the month is 212,000 × 12 = $2,544,000. Gross MRR churn for the month is (2,500 + 5,500) / 200,000 = 4.0 percent including contraction, and the lost-customer part alone is 2.75 percent. Net revenue retention for the month, counting existing customers only, is (200,000 + 6,000 - 2,500 - 5,500) / 200,000 = 198,000 / 200,000 = 99.0 percent. A business can grow while existing customers shrink, as here, because new customers outweigh losses. That distinction is the subject of net revenue retention.

When to use MRR and when to use ARR

The two are the same number on different scales. Choose the one that matches how decisions are made, and be explicit about the other when it helps. In the early stage, MRR is more responsive: a one-month change is visible. At the later stage, ARR is more comparable, and it is the figure typically used for valuation discussions. Do not change from one to the other in the middle of a trend without restating the history.

What neither metric is

• They are not revenue. Recognized revenue follows accounting rules and timing. A contract signed on the last day of the month adds to MRR immediately and adds almost nothing to that month's revenue.
• They are not bookings. Bookings measure the total value of contracts signed, including multi-year totals and one-time fees. A three-year, $90,000 contract is $90,000 of bookings and $30,000 of ARR.
• They are not cash. A customer paying annually upfront pays cash once, and MRR counts the monthly equivalent.
• They are not profit. A company can have strong recurring revenue and still lose money.

Common reporting errors

1. Including one-time fees. Implementation, setup and hardware are not recurring.
2. Counting signed but not live contracts as MRR without saying so. Some companies track "contracted ARR" separately from "live ARR".
3. Multiplying a peak month by 12. ARR taken from a month with unusual usage overstates the run rate.
4. Counting trials and free plans.
5. Keeping churned customers until the contract ends, while they have given notice. Decide on a rule, such as removing at the notice date or at the end of the term, and apply it consistently.
6. Mixing currencies without a fixed conversion policy.
7. Not adjusting for discounts or credits.
8. Changing definitions between reports.

Building the numbers

Start with a customer-level table: customer, plan, billing period, contract start and end dates, amount, currency and status. Calculate MRR per customer with a formula, then sum. Create a monthly snapshot and compute the bridge by comparing consecutive snapshots: new (customers with zero before and positive now), churn (positive before and zero now), expansion and contraction (positive both times, with a higher or lower amount). The bridge must reconcile: ending MRR equals starting MRR plus the movements. If it does not, there are classification errors.

A spreadsheet is enough in the early stage, and the data typically comes from the billing system. Reconcile the MRR figure to billing data and to recognized revenue each month, with a documented explanation for differences. See budgeting and forecasting for connecting the figure to a forecast.

Using MRR in planning

MRR is a base for forecasting. Start from the ending MRR of the last month, add expected new, expansion, contraction and churn, and project forward. Assumptions should come from history and the sales pipeline, not from targets. Keep a record of forecast versus actual to improve the assumptions. When recurring revenue funds a product that is physically delivered, such as a subscription box, the MRR forecast should feed the demand and inventory plan. See demand planning and inventory optimization.

Common mistakes

• Treating ARR as revenue.
• Counting one-time revenue as recurring.
• Not documenting how discounts, usage and trials are treated.
• Failing to reconcile the bridge.
• Switching definitions to improve the picture.

FAQs

What is the difference between MRR and ARR?

MRR is recurring revenue normalized to a month, and ARR is recurring revenue normalized to a year. ARR equals MRR times 12 when contracts are normalized monthly.

Is ARR the same as revenue?

No. Revenue is recognized under accounting rules over time, and ARR is a run-rate measure of contracted recurring revenue at a point in time.

How do I calculate MRR for an annual contract?

Divide the annual contract value by 12. A $12,000 annual contract is $1,000 of MRR.

Should I include one-time fees in MRR?

No. Implementation, setup, training and hardware are not recurring and belong outside MRR and ARR.

Which should a startup report to investors?

Most report ARR, supported by an MRR bridge that shows new, expansion, contraction and churn. State your definitions clearly.