The ARR formula
ARR is monthly recurring revenue multiplied by 12. A company with 42,000 euros of MRR has 504,000 euros of ARR. Net new ARR applies the same step to change: add new and expansion MRR, subtract contraction and churned MRR, then multiply the result by 12. The one thing people get wrong is what goes in: one-time fees and usage overages are not recurring, so they stay out.
ARR = MRR x 12 net new ARR = (new + expansion - contraction - churn) x 12
Stripe's ARR guide gives the same conversion: ARR equals MRR times 12.
The headline ARR is easy. The movements are where the truth is: a company can grow ARR on new logos while quietly bleeding it through churn, and only the net figure shows it. When expansion beats contraction plus churn, your base grows even with zero new customers, which is the definition of net revenue retention above 100 percent. Read what is ARR and MRR vs ARR, or the one-sentence ARR definition with the T2D3 growth benchmark.