Track predictable yearly revenue from subscriptions to measure business scale and growth trajectory in B2B SaaS and recurring revenue models.
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Annual Recurring Revenue (ARR) is the revenue a company expects to receive each year from subscription or recurring contracts. If a customer pays £10,000 per month, their ARR is £120,000. If 100 customers each pay £10,000 monthly, your total ARR is £12 million.
ARR is the primary metric for subscription-based and SaaS businesses because it measures the predictable revenue engine. Unlike one-time transactions, recurring revenue allows you to forecast future cash flow, plan headcount, and measure growth. A company growing ARR at 40% year-over-year with net revenue retention above 120% has a healthy business; the same company declining in ARR is in trouble, regardless of how many new customers they sign.
ARR differs from Monthly Recurring Revenue (MRR) by timeframe. MRR shows one month's predictable revenue; ARR annualises it. ARR also differs from Annual Contract Value (ACV), which is the total value of a contract divided by the contract length. A £120,000 contract over three years has an ACV of £40,000 but might contribute £40,000 ARR if billed upfront. These terms are often confused, so clarity matters.
Revenue that recurs each month is more valuable than one-time revenue. A company with £1 million in recurring revenue is more valuable than a company with £1 million in one-time sales and high churn. ARR growth is the scorecard for subscription businesses; it shows whether you're building a sustainable operation.
VCs and investors obsess over ARR because it predicts whether a company survives. Employees understand ARR goals better than abstract metrics; it ties to company viability and bonus structures. When everyone knows 'we need £5 million ARR to hit our funding target', focus aligns.
Predictable revenue lets you plan. If you know next month's ARR with 85% certainty (from existing contracts and churn patterns), you can forecast cash flow and budget headcount. This certainty is why subscription businesses command higher valuations than project-based services.
If you know your Monthly Recurring Revenue, multiply by 12. If your MRR is £50,000 and it's stable, your ARR is £600,000. This assumes churn and growth balance out month-to-month, which is true for mature businesses. Fast-growing companies need more careful calculation.
ARR changes from three sources: new customer acquisition (expansion ARR), upgrades and expansion within existing customers (net revenue retention), and churn (contraction). Tracking each separately shows what's working. You might have great new customer acquisition (£500K expansion ARR) but terrible retention (£300K churn), netting £200K growth. This tells a different story than a single number.
Calculate your Customer Acquisition Cost (CAC) payback: months to recover what you spent acquiring a customer. If your CAC is £5,000 and monthly revenue per customer is £1,000, your CAC payback is 5 months. Ideally, payback is under 12 months. If payback is 20+ months, your unit economics are broken.
Model what happens if you change churn, customer acquisition rate, or average deal size. If 5% monthly churn costs you £100K in ARR annually, what investments in retention would pay for themselves? These scenarios guide strategy and spending.
A project management tool started 2023 with £2 million ARR. They grew 50% to £3 million in 2024. Of that £1 million growth, £1.5 million came from new customer acquisition and £300K from expansion revenue in existing customers. But they also lost £800K to churn, indicating their net growth was really £1.8 million minus losses. Understanding these movements let them prioritise retention improvements alongside new sales.
Two SaaS companies each acquired £500K in new ARR. Company A had 3% monthly churn; Company B had 10%. After one year, Company A retained £455K of that new ARR. Company B retained only £180K. That 7 percentage point difference in churn rate cost Company B £275K in retained revenue. This gap accelerates over years.
A data analytics platform's total ARR was £10 million, with 85% from new customers and 15% from expansion. When they focused product efforts on expanding within existing customers, expansion revenue grew to 35% of new ARR. This shift reduced acquisition pressure; they could grow ARR faster with the same sales headcount because customers were upgrading and buying more features.
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