MRR vs ARR vs TTM Revenue, Explained (Formulas + Real Examples)

Short answer: MRR, ARR, and TTM revenue all describe how much money a business makes, but they answer different questions. MRR (Monthly Recurring Revenue) is the normalized recurring revenue you collect in one month. ARR (Annual Recurring Revenue) is that same recurring revenue annualized — literally MRR × 12. TTM revenue (Trailing Twelve Months) is the actual total revenue booked over the last 12 months, including one-time income. MRR and ARR are forward-looking run-rate metrics; TTM is a backward-looking record of what really happened — and it is the number buyers use to value an acquisition.

Founders mix these up constantly, and the confusion gets expensive at exactly the wrong moments: a fundraising deck, a board meeting, or an acquisition negotiation. This guide defines each metric, gives you the exact formula, shows when each one matters, and grounds everything in real numbers from BigIdeasDB's TrustMRR and SellSide datasets — the same data we built by analyzing 1M+ signals across the indie and SaaS economy.

MRR vs ARR vs TTM Revenue at a Glance

Table of Contents

• What Is MRR (Monthly Recurring Revenue)?
• What Is ARR (Annual Recurring Revenue)?
• What Is TTM Revenue (Trailing Twelve Months)?
• MRR vs ARR: When to Use Each
• Why TTM Revenue Wins in Acquisitions
• Real Numbers from the BigIdeasDB Datasets
• Common Mistakes Founders Make
• Frequently Asked Questions

What Is MRR (Monthly Recurring Revenue)?

MRR is the total normalized recurring revenue a business collects in a single month from active subscriptions. The word that matters is recurring: MRR counts predictable, repeatable subscription charges and excludes one-time fees, setup charges, and usage overages.

How to calculate MRR: sum every active subscription, converting annual and quarterly plans to a monthly equivalent first.

MRR = (number of customers) × (average revenue per customer per month). A $1,200/year plan contributes $100 to MRR — not $1,200.

MRR is the most sensitive metric you own. A single churned enterprise account or a wave of upgrades shows up immediately. That is why operators live in MRR: it is the earliest signal that growth is accelerating or stalling. For a deeper breakdown of what healthy MRR looks like by category, see our TrustMRR SaaS revenue benchmarks for 2026.

What Is ARR (Annual Recurring Revenue)?

ARR is your recurring revenue expressed on an annual basis. The formula is refreshingly simple:

ARR = MRR × 12

ARR does not measure a calendar year of earnings. It is a run rate — a projection that assumes your current MRR holds steady for twelve months. That makes ARR perfect for board decks and fundraising (investors think in annual terms) but dangerous if you treat it as money already in the bank.

Real example: in BigIdeasDB's TrustMRR dataset, Rezi, an AI resume tool, runs about $273,192 in MRR, which annualizes to roughly $3.28M ARR. Cometly, an analytics product, sits at about $201,301 MRR across 7,908 customers — an implied $2.42M ARR. The ARR figure is useful shorthand, but notice it says nothing about how long either company has actually sustained that revenue. That is where TTM comes in.

What Is TTM Revenue (Trailing Twelve Months)?

TTM revenue is the total revenue a business actually booked over the most recent 12 consecutive months. It is recalculated as each month closes — drop the oldest month, add the newest — so it is a rolling, always-current window. TTM is also called LTM (Last Twelve Months); the two terms are interchangeable.

How to calculate TTM revenue: add up actual revenue from each of the last 12 months. Unlike MRR and ARR, TTM includes everything — recurring subscriptions, one-time setup fees, services, and overages. It is what hit the bank account, not what a run rate predicts.

Because it is grounded in real history, TTM is the metric of choice for valuations and due diligence. A founder can quote a $50K MRR figure (implying $600K ARR) after a single strong month, but TTM forces the question: how much did you actually earn over the past year? If the business is three months old, its TTM revenue is far below its ARR run rate — and a serious buyer will discount accordingly.

MRR vs ARR: When to Use Each

MRR and ARR describe the same recurring revenue at different zoom levels, so the choice is about audience and time horizon:

• Use MRR for weekly and monthly operating reviews. It surfaces churn, expansion, and new-logo momentum fast.
• Use ARR for board meetings, fundraising, and long-range planning, where annual run rate is the common language.
• Watch the gap. If your MRR is volatile, annualizing it into ARR can flatter — or panic — the room. Always pair ARR with the underlying MRR trend.

Category context helps here. In our TrustMRR data, the average Marketing startup earns about $2,535 MRR (~$30,420 ARR) while the average Artificial Intelligence startup sits near $1,746 MRR (~$20,950 ARR) — but those averages hide enormous spread, with the top AI performer above $287,000 MRR. Curious how fast these companies climb the MRR ladder? See how fast SaaS startups actually grow.

Why TTM Revenue Wins in Acquisitions

When a SaaS business changes hands, TTM revenue and TTM profit are the anchor numbers. Buyers apply a multiple to them to arrive at an asking price. They use TTM rather than ARR because it cannot be inflated by a single great month — it reflects a full year of real performance, including the slow months.

In BigIdeasDB's SellSide dataset, 615 businesses disclose a TTM revenue figure on their listings, and TTM is the field that drives the headline valuation. Across those listings, the average disclosed TTM revenue is about $213,700, and businesses sell at an average revenue multiple of roughly 2.4x TTM. The multiple varies sharply by business type — which is exactly why understanding TTM matters before you negotiate.

The pattern is clear: recurring-revenue SaaS and AI businesses command higher multiples on lower TTM revenue, while agencies and ecommerce — with more one-time, less predictable revenue — trade below 1.5x TTM despite higher top-line numbers. One representative SaaS listing showed $1,000,000 TTM revenue with an $80,000 most-recent month, priced at $1,200,000 (a 1.2x revenue multiple) — acquire.com listing. The lesson: the same TTM revenue is worth very different amounts depending on how recurring and durable it is. To go deeper on how those multiples are set, read our guide to SaaS valuation multiples in 2026 and our walkthrough on how to sell your SaaS in 2026.

Real Numbers from the BigIdeasDB Datasets

Definitions are easy to memorize and easy to misapply. Here are real, aggregated figures that show how MRR, ARR, and TTM look in the wild:

• Rezi (AI): ~$273,192 MRR → ~$3.28M implied ARR (TrustMRR).
• 1Lookup (SaaS): ~$230,885 MRR across 5,784 customers → ~$2.77M implied ARR (TrustMRR).
• Cometly (Analytics): ~$201,301 MRR across 7,908 customers → ~$2.42M implied ARR (TrustMRR).
• The typical revenue-generating indie SaaS earns about $7,292 MRR — roughly $87,500 implied ARR — across 782 startups in that band (TrustMRR).
• Across 615 businesses for sale, average disclosed TTM revenue is ~$213,700, selling at ~2.4x TTM (SellSide).
• SaaS sells at 2.63x TTM; agencies at just 1.41x — the recurring-revenue premium, quantified (SellSide).

Notice the divide. TrustMRR companies broadcast MRR and ARR because they are growing and want to signal run rate. SellSide listings lead with TTM revenue because they are being valued and the buyer wants history. Same businesses, different stage, different metric.

Common Mistakes Founders Make

1. Putting one-time fees into MRR or ARR. Setup fees, consulting, and usage overages are not recurring. They inflate your run rate and collapse the moment you stop selling them. Keep them in total or TTM revenue.

2. Treating ARR as money in the bank. ARR is a projection. A business doing $50K MRR for one month has a $600K ARR run rate but may have earned only $120K of TTM revenue so far. Lenders and acquirers will price off the latter.

3. Forgetting to annualize plan lengths. An annual plan billed once a year is still monthly recurring revenue when normalized. Drop a $1,200 annual charge straight into a single month's MRR and you will badly distort the trend.

4. Quoting ARR in an acquisition. Buyers want TTM. Leading with ARR when your trailing twelve months tell a different story erodes trust during diligence. If you are preparing to sell, learn how revenue is verified in our Revenue Intelligence tool guide before you list.

Get the definitions straight, attach the right metric to the right audience, and you will sound credible in every room — from the board table to the data room. When you are ready to benchmark your own numbers against 1M+ real signals, start at BigIdeasDB.

Frequently Asked Questions

What is the difference between MRR, ARR, and TTM revenue?

MRR (Monthly Recurring Revenue) is the normalized recurring revenue a SaaS business collects in a single month. ARR (Annual Recurring Revenue) is that same recurring revenue expressed annually — simply MRR multiplied by 12. TTM revenue (Trailing Twelve Months) is the actual total revenue recorded over the last 12 consecutive months, including one-time and non-recurring income. MRR and ARR are forward-looking run-rate metrics; TTM is a backward-looking record of what actually happened, and it is the figure buyers use when valuing an acquisition.

How do you calculate MRR and ARR?

MRR is the sum of all normalized monthly recurring charges from active subscriptions. Convert annual plans to a monthly equivalent first (a $1,200/year plan counts as $100 of MRR). ARR equals MRR multiplied by 12. For example, a startup with $273,192 in MRR — like Rezi in BigIdeasDB's TrustMRR dataset — has an implied ARR of roughly $3.28M. Always exclude one-time fees, setup charges, and usage overages from MRR and ARR; those belong in total or TTM revenue.

What is TTM revenue and why does it matter for acquisitions?

TTM (Trailing Twelve Months) revenue is the total revenue a business booked over the most recent 12 months, recalculated as each new month closes. It matters for acquisitions because buyers value a business on what it has actually earned, not on an optimistic run rate. Across 615 SaaS and online businesses listed for sale in BigIdeasDB's SellSide dataset, the average disclosed TTM revenue is about $213,700, and listings sell at an average revenue multiple of roughly 2.4x TTM. A founder who quotes ARR but has only three months of history is quoting a projection; TTM forces the conversation back to reality.

Is ARR the same as TTM revenue?

No. ARR is a run-rate projection — it annualizes your current monthly recurring revenue as if it stayed flat for a year, so a brand-new month of $50K MRR implies $600K ARR even with no track record. TTM revenue is the sum of the last 12 months of actual revenue. For a business with steady, mature recurring revenue the two can be close, but they diverge sharply for fast-growing or seasonal businesses. Acquirers trust TTM; investors and operators track ARR.

Which revenue metric should a SaaS founder track?

Track MRR day to day because it is the most sensitive to churn, upgrades, and new signups. Use ARR for board updates, fundraising, and run-rate goals. Reach for TTM revenue when you are selling, buying, or being valued — it is the number on every acquisition listing. In BigIdeasDB's TrustMRR data, the typical revenue-generating indie SaaS sits around $7,300 MRR (roughly $87,500 implied ARR), so most founders live in MRR daily and only translate to ARR and TTM at milestone moments.