What is the difference between ARR and MRR?

ARR (Annual Recurring Revenue) and MRR (Monthly Recurring Revenue) measure the same thing at different time scales — ARR = MRR × 12. MRR is better for day-to-day operational tracking at early stages where the business moves fast. ARR is preferred for fundraising, investor reporting, and valuation once a company reaches $1M ARR or begins signing annual contracts.

Does one-time revenue count toward ARR?

No. ARR counts only recurring, predictable subscription revenue. One-time setup fees, professional services, consulting revenue, and non-recurring training fees are explicitly excluded. Mixing non-recurring revenue into ARR overstates the business's durability and misleads investors about true recurring revenue.

What ARR do you need to raise a Series A?

The typical Series A threshold in the current market is $3–5M ARR with strong year-over-year growth (100%+) and evidence of a repeatable sales motion. Some firms will move earlier on exceptional teams, but $3M ARR is the most commonly cited minimum for a credible Series A conversation in B2B SaaS.

Net new ARR is the change in ARR from one period to the next: Net New ARR = New ARR + Expansion ARR − Churned ARR − Contraction ARR. It is the most accurate measure of ARR momentum because it accounts for both growth and losses. A company can show flat net new ARR despite strong new logo growth if churn is eating the gains.

ARR — Annual Recurring Revenue — Startup Super School

What Is ARR (Annual Recurring Revenue)?

Annual Recurring Revenue (ARR) is the total annualized value of all active, recurring subscription contracts a SaaS company holds at a given point in time. It answers the question: “If nothing changes — no new customers, no churned customers, no expansions or contractions — how much subscription revenue will this company generate in the next 12 months?”

ARR is the single most important top-line metric for subscription-based software businesses. It is the number investors use to value SaaS companies, the number boards track at every meeting, and the north star that sales teams are typically compensated to grow.

The ARR Formula

The most common ways to calculate ARR are:

Method 1: From MRR

ARR = MRR × 12

Method 2: From individual contracts

ARR = Sum of (Annual Contract Value for all active subscriptions)

For monthly subscriptions, you annualize each contract by multiplying the monthly fee by 12. For annual contracts, you use the contracted annual value directly. For multi-year contracts, you use the average annual value (a $30,000 three-year contract contributes $10,000 to ARR per year).

What Counts Toward ARR (and What Does Not)

ARR counts only recurring, predictable revenue. This distinction matters for accurate reporting:

Counts toward ARR:

Monthly subscription fees (annualized)
Annual subscription fees
Recurring usage-based fees with a committed minimum
Recurring seat-based or license fees

Does NOT count toward ARR:

One-time setup or implementation fees
Professional services or consulting revenue
Non-recurring training fees
Overage fees above a committed baseline (until recurring)
Hardware or device sales

This is a critical distinction because mixing non-recurring revenue into ARR overstates the business’s true recurring revenue base and misleads investors and internal decision-makers about the company’s durability.

ARR vs. MRR: When to Use Each

Dimension	ARR	MRR
Primary audience	Investors, board, strategic planning	Operations, finance, growth team
Time horizon	Annual / strategic	Monthly / operational
Best use case	Valuation, fundraising, benchmarking	Weekly/monthly performance tracking
Typical adoption	Companies with annual contracts or $1M+ scale	Earlier stage, monthly billing models
Relationship	ARR = MRR × 12	MRR = ARR ÷ 12

In practice, early-stage startups (pre-$1M ARR) tend to track MRR more closely because their business moves fast enough that monthly data is more actionable. As companies grow and shift to annual contracts, ARR becomes the primary reporting metric because it better reflects contracted revenue certainty.

ARR Milestones That Matter

Certain ARR thresholds carry specific strategic significance in the venture-backed startup world:

$1M ARR: Often cited as the clearest early signal of product-market fit in B2B SaaS. At $1M ARR, a company has enough paying customers to validate that the product solves a real problem at a price the market will bear. This threshold is roughly the expected outcome of a well-executed seed round.

$3–5M ARR: The typical Series A threshold in the current market. VCs expect to see $3M ARR with strong growth rates (100%+ year-over-year) and evidence of repeatable sales motion before leading a Series A.

$10M ARR: The unofficial threshold for Series B readiness in SaaS. A company at $10M ARR with efficient unit economics (LTV:CAC > 3x, payback period < 18 months) and continued strong growth is a credible Series B candidate.

$100M ARR: The threshold often discussed for IPO readiness in SaaS, though many companies have gone public below this level. At $100M ARR, the business has demonstrated scale and repeatability.

The T2D3 Growth Benchmark

One of the most referenced ARR growth benchmarks in SaaS is T2D3 — coined by Neeraj Agarwal of Battery Ventures. It describes the growth path of a typical high-growth SaaS company from $2M to $100M ARR:

Year 1: Triple from ~$2M to ~$6M ARR
Year 2: Triple from ~$6M to ~$18M ARR
Year 3: Double from ~$18M to ~$36M ARR
Year 4: Double from ~$36M to ~$72M ARR
Year 5: Double from ~$72M to ~$144M ARR

Not every SaaS company needs to hit T2D3 to be considered healthy, but it represents the growth trajectory expected by top-tier VCs from portfolio companies pursuing a venture-scale outcome. Companies growing at or near T2D3 rates command the highest valuation multiples.

ARR Components

Understanding what drives ARR growth and contraction requires breaking it into its component parts:

New ARR: Revenue from customers who did not exist in the prior period. This is the growth engine — the result of marketing and sales efforts converting new logos.

Expansion ARR: Additional recurring revenue from existing customers — through seat additions, plan upgrades, or usage growth. Companies with strong expansion ARR are especially attractive to investors because it signals deep product value and pricing power. Top SaaS companies generate 30–50% of their ARR growth from expansion.

Churned ARR: Revenue lost from customers who cancel their subscription entirely. Churned ARR is the primary negative force on ARR. Even a low annual churn rate (5%) compounds painfully: at 5% annual churn, a company must grow new ARR by at least 5% just to stay flat.

Contraction ARR: Revenue lost from existing customers who downgrade to a smaller plan. Contraction ARR is distinct from churn — the customer stays but pays less.

Net New ARR: The net change in ARR from period to period.

Net New ARR = New ARR + Expansion ARR - Churned ARR - Contraction ARR

Example ARR Calculation

Consider a SaaS company at the start of Q1 with the following active subscriptions:

Customer	Contract Type	Value
Acme Corp	Annual: $24,000/year	$24,000 ARR
Beta Inc	Monthly: $1,000/month	$12,000 ARR
Gamma LLC	Annual: $60,000/year	$60,000 ARR
Delta Co	Monthly: $500/month	$6,000 ARR

Total ARR = $24,000 + $12,000 + $60,000 + $6,000 = $102,000

If during Q1, Beta Inc upgrades to $1,500/month ($18,000 ARR) and Delta Co cancels, the new ARR is:

New ARR = $24,000 + $18,000 + $60,000 = $102,000

Net New ARR in Q1: +$6,000 (expansion from Beta) - $6,000 (churn from Delta) = $0. The company held ARR flat despite a churn event, saved by expansion.

Key Takeaway

Annual Recurring Revenue is the foundational health metric for SaaS businesses — the annualized value of all active subscriptions, counting only recurring fees. Key milestones ($1M, $5M, $10M ARR) signal fundraising readiness and product-market fit. The T2D3 framework (triple, triple, double, double, double) sets the growth benchmark for venture-scale outcomes. Understanding ARR requires tracking its four components — new, expansion, churned, and contraction ARR — because growth in the headline number can mask dangerous churn dynamics that only the component breakdown reveals.