Practical guides for
AI builders & SaaS operators
No fluff, no AI-generated filler — just the formulas, benchmarks, and reasoning behind the numbers our calculators produce.
Understanding Capital Gains Taxes 2026: Rates, Brackets & Tax Strategies
A comprehensive guide to 2026 capital gains tax rates, standard and long-term brackets, holding periods, and strategies to minimize your tax bill.
How to Reduce Your AI API Costs
Six concrete ways to cut your AI API bill without sacrificing output quality — model selection, prompt caching, and output budgeting, grounded in real per-token pricing.
llms.txt vs. robots.txt: What's the Difference?
robots.txt blocks crawlers; llms.txt describes your site for AI systems. Here's exactly how the two files differ, and why you likely need both.
How to Calculate Work Hours with Lunch Break (Formula + Free Calculator)
Learn how to calculate work hours with lunch break using a clear formula and real examples, plus try our free work hours calculator for instant results.
How to Calculate Square Footage of a Room (Including Irregular Shapes)
Learn how to calculate square footage of a room, including L-shaped and irregular spaces, with simple formulas and a free square footage calculator tool.
How to Calculate Percentage Increase (Formula, Examples & Common Uses)
Learn how to calculate percentage increase with the formula, step-by-step examples, and real-world uses, plus try our free percentage increase calculator.
How to Convert Celsius to Fahrenheit (Formula, Chart & Quick Method)
Learn how to convert Celsius to Fahrenheit with the formula, a quick mental shortcut, and reference charts, plus try our free temperature converter tool.
How Much to Tip at a Restaurant (By Service Type + Easy Calculator)
Learn how much to tip at a restaurant by service type, how to split a bill, and tipping etiquette, plus use our free tip calculator for instant accuracy.
How to Calculate Age from Date of Birth (Manual Formula + Free Tool)
Learn how to calculate age from date of birth manually, in exact years, months, and days, plus try our free age calculator for instant, accurate results.
How to Calculate Days Between Two Dates (Including Business Days Only)
Learn how to calculate days between two dates, including business days only and weeks, plus use our free days between dates calculator for instant totals.
How to Calculate GPA: Step-by-Step Guide with Examples
Learn how to calculate GPA step by step with a real course example, the GPA scale, and weighted versus unweighted GPA, plus try our free GPA calculator.
How to Calculate BMI: Formula, Chart & What Your Number Means
Learn how to calculate BMI using the metric and imperial formulas, what your number means, and its limitations, plus try our free BMI calculator tool today.
How to Convert a Decimal to a Fraction (Step-by-Step with Examples)
Learn how to convert decimal to fraction step by step, including simplifying and repeating decimals, plus try our free decimal to fraction calculator.
Best SEO Tools for SaaS Companies in 2025: A Founder's Toolkit
Keyword research, technical audits, content optimization, and rank tracking — the SEO tools SaaS founders actually need. Plus the free tool strategy that earns organic traffic without a full content team.
Best AI Tools for SaaS Startups in 2025: A Practical Guide
From LLM cost tracking and context window planning to AI coding assistants and customer support automation — the AI tools that actually move the needle for resource-constrained SaaS startups.
Best SaaS Tools for Startups in 2026: Curated by Category
The essential SaaS startup toolkit, curated by category: free financial calculators, product analytics, customer support, email automation, CRM, and developer infrastructure — with honest free-tier picks at every level.
AI API Token Costs Explained: How GPT, Claude & Gemini Pricing Actually Works
A practical breakdown of how LLM API pricing works, what actually drives your bill up, and how to estimate and cut costs across GPT, Claude, Gemini, and DeepSeek.
LLM Context Windows Explained: How Much Can You Actually Fit in a Prompt?
What a context window really measures, how system prompts, chat history, and RAG chunks eat into it, and how to avoid silent truncation and overflow errors.
MRR vs ARR: The Complete Guide to SaaS Revenue Metrics
How MRR and ARR are calculated, when to use each, and how to break revenue down into new, expansion, contraction, and churned MRR for an accurate growth picture.
What Is a Good LTV:CAC Ratio? A Founder's Guide to SaaS Unit Economics
How to calculate customer lifetime value, CAC, and payback period — and the LTV:CAC benchmarks investors actually look for at each stage of growth.
Burn Rate and Runway: How to Calculate How Long Your Startup Has Left
Gross burn vs net burn, how to calculate runway correctly, and the warning signs that tell you it's time to start fundraising — explained with real formulas.