Calculator guides
The formulas behind our free calculators, worked examples, and the mistakes to avoid.
- How to Calculate MRR (Monthly Recurring Revenue)How to calculate MRR step by step, the mistakes that quietly inflate it, and how to break growth into new, expansion, and churned MRR.
- How to Calculate Churn Rate for SaaSHow to calculate customer and revenue churn, why the two numbers can disagree, and what a defensible churn benchmark looks like by price point.
- How to Calculate LTV (Customer Lifetime Value)How to calculate customer lifetime value from ARPU, margin, and churn, and why the LTV to CAC ratio matters more than LTV on its own.
- How to Calculate CAC (Customer Acquisition Cost)How to calculate customer acquisition cost correctly, what to actually include in the spend, and how to judge whether your CAC is healthy.
Research guides
How to find the right communities and the right search phrases before you build.
- How to Find Startup Ideas on RedditA quick guide to finding startup ideas on Reddit: which subreddits to check, what a real signal looks like, and how to avoid the common traps.
- How to Use the Subreddit FinderHow to use the free subreddit finder to search by niche instead of guessing subreddit names, and what to do when a niche returns no results.
Product guides
How to validate an idea, and exactly how IdeaFast scores the pain points it finds.
- How to Validate an Idea Before BuildingA practical checklist for validating a startup idea before you write code: measuring real pain, checking willingness to pay, and talking to buyers.
- How IdeaFast Scores Pain PointsThe exact methodology IdeaFast uses to turn raw Reddit and Hacker News discussions into scored, evidence-linked pain points founders can trust.
Comparisons
Honest, side-by-side comparisons with other research tools.