SaaS Metrics Explained: ARR, MRR, LTV, CAC (With Benchmarks) | The SaaS Library
ARR, MRR, LTV, CAC — every core SaaS metric explained with formulas, verified 2025–2026 benchmarks, and the metric dependency chain that shows which number to fix first. Includes the CAC Payback reality check (20 months median), NRR benchmarks from ChartMogul’s 3,500+ company dataset, and a stage-by-stage diagnostic.














