MRR to ARR Calculator — Normalise a Mixed Billing Book

Background.

MRR and ARR are the two numbers a subscription business is judged on, and the arithmetic linking them is trivial — ARR is MRR times twelve. Everything difficult about these metrics sits upstream, in deciding what belongs in MRR at all. This calculator does that part: it normalises monthly, quarterly and annual billing to a single monthly figure, annualises it, and reports the non-recurring revenue separately so you can see how much of your top line is not actually recurring. A book of $40,000 in monthly plans, $600,000 of annual contracts and $30,000 of quarterly contracts is $100,000 of MRR and $1,200,000 of ARR. Add $12,000 a month of implementation and services revenue and run-rate revenue rises to $1,344,000 — but ARR does not move, and the recurring share of the business is 89.29%.

The normalisation is mechanical. Annual contracts contribute one twelfth of their annual value; quarterly contracts contribute one third of their quarterly billing; monthly plans contribute at face value. Note what the annual field wants: the ANNUAL value, not the total contract value. A three-year contract worth $180,000 in total contributes $60,000 to the annual book, not $180,000. Entering the multi-year total is the single most common way to overstate ARR by a multiple, and it is why per-contract normalisation belongs in an annual contract value calculator rather than here.

The exclusion that matters is non-recurring revenue. Andreessen Horowitz's "16 Startup Metrics" is explicit that ARR "should exclude one-time (non-recurring) fees and professional service fees", and names the two classic errors: counting non-recurring items such as hardware, setup, installation and consulting agreements, and counting bookings rather than committed recurring revenue. Bessemer Venture Partners, writing independently, draws the same line and gives the excluded figure its own name: ARRR — annual run rate revenue — is "the ARR, plus any non-recurring revenue related to items such as professional services, transactions, and implementations". Two firms, thirteen years of separation between the posts, the same boundary. This calculator reports both sides of it, because the gap is the number a diligence process will find whether or not you show it first.

Why the boundary is drawn there is a question about durability, not accounting neatness. Recurring revenue renews unless something breaks; services revenue must be re-sold every time. A company with $1.2 million of ARR and $144,000 of annual services revenue starts next year at $1.2 million; a company with $1.344 million of undifferentiated "revenue" that is 40% services starts next year at whatever it can sell again. Bessemer's argument goes further: services revenue is low gross margin, scales only with headcount, and slows implementations — so it is not merely non-recurring but structurally less valuable per dollar.

The most important thing to understand about ARR is what it is not. It is not GAAP revenue. Under FASB ASC 606 a subscription is a performance obligation satisfied over time, so a company recognises the contract's value ratably across the service period; a $1.2 million annual contract signed on 1 December contributes about $100,000 to that fiscal year's recognised revenue and $1.2 million to ARR the moment it is signed. The two figures answer different questions — one is what accounting says you earned, the other is what you are contracted to earn at today's run rate — and they will differ for any growing company. Nor is ARR a standardised measure: no standard-setter defines it, which is precisely why SEC Release 33-10751 (30 January 2020) tells registrants presenting a metric like ARR to disclose its definition, the reason it is useful, how management uses it, and any change in how it is calculated.

One reading caution belongs beside the result rather than behind it. ARR is a point-in-time run rate. It says nothing about whether that base is growing or shrinking, how much of it renews, or how concentrated it is in a few accounts. The share of MRR sitting on annual contracts, reported here, is the first hint: a high figure means better cash collection and fewer churn decision points each month, but it also means churn arrives in a small number of large, dateable events rather than as a smooth trickle — and it means a renewal season can undo a year of reported growth in a fortnight. Retention and churn calculators answer that question; this one only tells you how big the base is today.

What is mrr to arr calculator?

Monthly recurring revenue (MRR) is the total committed subscription revenue a business earns in a month, normalised so that customers on different billing frequencies are directly comparable: annual contracts are divided by twelve, quarterly contracts by three, monthly plans counted at face value. Annual recurring revenue (ARR) is the same figure annualised — MRR multiplied by twelve. Both are run-rate operating metrics rather than accounting measures: they describe what the business is contracted to earn at today's prices and customer base, not what accounting rules say it has earned. Both exclude non-recurring revenue by definition. Implementation and onboarding fees, training, custom development, hardware and uncommitted usage overage are all revenue, but none of them renews on their own, so including them in ARR would mean reporting next year a number the business must re-sell to achieve. Bessemer Venture Partners keeps the combined figure as a separate metric it calls ARRR, annual run rate revenue, and this calculator reports the same split. Neither MRR nor ARR is defined by FASB, the IASB or the SEC — which is why the SEC's 2020 guidance on key performance indicators requires a registrant that presents ARR to disclose exactly how it is calculated, and to flag any change in that calculation between periods.

How to use this calculator.

1. 01Enter the combined monthly price of every customer on a monthly plan. Use committed subscription price rather than what happened to be invoiced this month — a mid-month upgrade counts at its new rate.
2. 02Enter the combined ANNUAL value of every annually-billed customer. Not the total contract value: a three-year deal worth $180,000 in total contributes $60,000 here. Getting this wrong overstates ARR by the number of years in the term.
3. 03Enter one quarter's billing across every quarterly customer. The calculator divides by three.
4. 04Enter non-recurring revenue per month — implementation, onboarding, training, custom work, hardware, uncommitted overage. This is excluded from MRR and ARR on purpose and reported separately.
5. 05Read MRR and ARR as the recurring base, and read the recurring share alongside them. A recurring share below about 80% means the ARR headline is describing a materially different business from the one generating the cash.
6. 06Check the share of MRR sitting on annual contracts. It is the fastest read on how concentrated your renewal risk is in time, and on how much of your cash arrives up front.
7. 07Take ARR to the retention, churn and quick-ratio calculators to find out whether the base is growing. This page tells you how big it is today, not where it is heading.

The formula.

MRR is the sum of three normalised streams: monthly-billed revenue at face value, the combined annual contract book divided by twelve, and the combined quarterly book divided by three. ARR is that MRR multiplied by twelve. Run-rate revenue adds back the non-recurring revenue that MRR excludes, and the annual version of it is what Bessemer calls ARRR. Two percentages fall out: the share of MRR carried by annual contracts, and MRR as a share of all monthly revenue. Rounding happens only at the return boundary, and the order matters more than it looks. ARR is computed from the UNROUNDED MRR and rounded once at the end, because rounding MRR first and then multiplying by twelve loses money on every contract whose annual value is not divisible by twelve — a $100 annual contract has an MRR of $8.3333…, which displays as $8.33, and $8.33 × 12 is $99.96 rather than $100.00. The same applies to quarterly contracts divided by three. Every intermediate value is carried at full arbitrary decimal precision; currency and percentages are each rounded to two decimal places once, at the end.

A worked example.

Frequently asked questions.

References& sources.

1. [1]Jordan, J., Hariharan, A., Chen, F., & Kasireddy, P. (21 August 2015). "16 Startup Metrics." Andreessen Horowitz. Quoted verbatim on this page: ARR "should exclude one-time (non-recurring) fees and professional service fees", and the two classic errors of counting non-recurring fees and counting bookings. Retrieved 29 July 2026; quotes verified against the live page.
2. [2]Deeter, B. (2 October 2012). "The five accounting metrics for cloud companies." Bessemer Venture Partners Atlas. Independent second authority on the recurring/non-recurring boundary: "ARR is simply the currently recognized portion of this monthly revenue, multiplied by twelve" and "ARRR is the ARR, plus any non-recurring revenue related to items such as professional services, transactions, and implementations". Also the source for CMRR. Retrieved 29 July 2026; quotes verified against the live page.
3. [3]Financial Accounting Standards Board (May 2014). Accounting Standards Update No. 2014-09, "Revenue from Contracts with Customers (Topic 606)." Source for the point that a subscription is a performance obligation satisfied over time and recognised ratably (ASC 606-10-25-27), which is why ARR is not GAAP revenue. Authoritative PDF; URL verified live (HTTP 200) 29 July 2026.
4. [4]U.S. Securities and Exchange Commission (30 January 2020). Release No. 33-10751, "Commission Guidance on Management's Discussion and Analysis of Financial Condition and Results of Operations." Requires a registrant presenting a metric such as ARR to disclose its definition, method of calculation, why it is useful and how management uses it, and to flag material changes in the calculation. Effective 25 February 2020. sec.gov returns HTTP 403 to automated fetchers; release number, title and dates verified independently.
5. [5]Hsu, J. "Diligence at Social Capital Part 2: Accounting for Revenue Growth." Source for the growth-accounting decomposition of recurring revenue into new, resurrected, expansion, contraction and churned components — the framework that separates the size of the recurring base from its direction of travel. Retrieved 29 July 2026.
6. [6]17 CFR § 229.303 (Regulation S-K Item 303, Management's Discussion and Analysis). Context for how operating metrics are presented alongside GAAP results in periodic reports. Text verified 29 July 2026 via the Cornell LII mirror of the eCFR.