Free tools
Customer success calculators.
Free, no sign-up, no email gate. Each one shows the formula, the benchmark range, and the mistake most people make when calculating it.
4 calculators
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Churn rate calculator
Calculate customer churn rate and retention rate for any period, with the annualized equivalent and benchmark context for B2B SaaS.
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Net revenue retention (NRR) calculator
Calculate net revenue retention and gross revenue retention from starting MRR, expansion, contraction, and churn — with benchmark context for B2B SaaS.
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Customer lifetime value (CLV) calculator
Calculate customer lifetime value from ARPA, gross margin, and churn — plus your LTV:CAC ratio and payback period, with benchmark context.
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Customer health score calculator
Build a weighted customer health score from product usage, stakeholder engagement, support sentiment, and value realization — and see how weighting changes the result.
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Definitions
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Every metric these calculators produce has a full entry in the glossary — formula, worked example, benchmark ranges, and an honest account of what the number does and does not tell you.
Browse the glossaryYour next account move is already in the signals
Calculating churn is easy. Preventing it is not.
Aartha surfaces which accounts are drifting — with the reason and the receipt — before the number moves.