Tools built for
technical operators
Free calculators for AI builders, startup founders, and SaaS teams. No sign-up. No paywalls. Runs in your browser.
AI & LLM Economics
AI Token Calculator
Estimate token usage and API billing for GPT, Claude, Gemini, and DeepSeek. Compare costs across models in real time.
Context Window Estimator
Break down prompt payload — system prompt, history, RAG chunks, and output — to measure remaining context capacity.
SaaS & Startup Economics
SaaS Unit Economics
Calculate LTV, CAC, payback period, and gross margin health. Model churn impact on revenue and valuation.
MRR & ARR Calculator
Model net new MRR, ARR, NRR, and MoM growth. Break down new, expansion, contraction, and churned revenue.
Burn Rate & Runway
Model gross and net burn, funding runway, and exhaustion date. Project monthly cash flow with dynamic inputs.
Review Intelligence Analyzer
Detect review manipulation through language authenticity scoring, rating distribution patterns, and velocity anomaly detection.
Why Utilitymania?
Every tool runs entirely in-browser. Results are immediate, private, and copyable. Built for repeat daily use by founders and builders who need correct numbers without friction.
No sign-up
Open and use instantly
Server-rendered
Fast initial loads
Mobile-ready
Works on any device
No paywalls
All tools are free