SaaS Calculators 2026 - Churn, Runway, LTV:CAC, Rule of 40
What makes the saas category useful
This category groups calculators that solve closely related real-world tasks, so you can move from a quick estimate to a more specific planning tool without restarting the process.
Project monthly cash runway from current bank balance and net burn
Quantify churn impact in lost MRR and ARR over the next 12 months
Calculate LTV to CAC ratio and gross margin payback period for unit economics
Score Rule of 40 (growth rate plus profit margin) for board reporting
Estimate AI chatbot and agentic AI rollout costs against expected ROI
Board and investor updates
Pull Rule of 40, LTV:CAC, and runway figures for board decks and investor reports.
Growth and retention planning
Model how a 1 point churn improvement compounds into MRR and ARR over a year.
AI rollout business cases
Compare AI chatbot or agentic ROI against current support and ops cost lines.
All SaaS Calculators
Churn Impact Calculator
Visualize 12-month revenue impact of churn.
Rule of 40 Calculator
Check your SaaS Rule of 40 score.
LTV:CAC Ratio Calculator
Grade your LTV to CAC ratio health.
SaaS Runway Calculator
Calculate startup runway and burn rate.
AI Chatbot Cost Calculator
Estimate LLM API, hosting, and cost per conversation.
Agentic ROI Calculator
Compare a full-time role to an AI agent stack and see real ROI.
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What is a healthy LTV:CAC ratio for SaaS?
A 3:1 LTV to CAC ratio is the common benchmark. Below 3:1 means you are spending too much to acquire customers, and above 5:1 may mean you are underinvesting in growth.
How do I calculate SaaS runway?
Runway equals current cash divided by net monthly burn rate. With $2 million in the bank and $200,000 net monthly burn, runway is 10 months. Plan to raise or hit profitability with at least 6 months of buffer.
What is the Rule of 40 for SaaS?
Rule of 40 says revenue growth rate plus profit margin should add up to 40 percent or more. A SaaS growing 30 percent with a 15 percent profit margin scores 45, which is healthy for late-stage SaaS.
How does churn impact ARR over 12 months?
On $1 million ARR, 2 percent monthly churn loses about $215,000 of starting ARR over 12 months before any new bookings. Cutting churn from 2 to 1 percent recovers roughly $115,000 of that retained revenue.
How is agentic ROI different from chatbot ROI?
Chatbots automate single-turn responses. Agentic AI completes multi-step workflows. The ROI calculator factors in time saved per workflow, monthly volume, and the fully loaded cost of the human alternative to compare both clearly.
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