The DoCalc Blog
Plain-language explainers behind every calculator — what the numbers mean, what's a good benchmark, and how to actually improve yours.
Latest articles
How Much Does Life Insurance Cost? Rates by Age, Gender, and Health
A full term life rate table, plus a worked example.
COBRA Insurance Cost: Why It's So Expensive (The 102% Rule)
The federal rule behind COBRA pricing, and cheaper alternatives.
Medicare Supplement: Plan G vs Plan N in 2026
What each plan covers, and which fits your budget.
Do You Need Flood Insurance?
What your home policy never covers, and what it costs.
How Much Does Long-Term Care Cost? 2025 Data
Genworth Cost of Care Survey figures by care type.
Final Expense Insurance: How Much Coverage Do You Need?
National funeral cost medians and how to size coverage.
Pet Insurance Cost Guide: Is It Worth It?
What pet insurance costs by species and coverage type.
How Much House Can You Afford? The 28/36 Rule Explained
The rule lenders use to size a mortgage to your income, plus a worked example.
15-Year vs 30-Year Mortgage: Which Should You Choose?
A worked comparison of total interest, monthly payment, and when each term makes sense.
Debt Snowball vs Avalanche: Which Payoff Method Wins?
Which method saves more money, and which one keeps you motivated.
How Much Do You Need to Retire? A Practical Framework
The 4% rule, the 25x savings target, and how to turn it into a real number.
When Should You Refinance Your Mortgage?
The break-even math that tells you if refinancing actually pays off.
What's a Good Churn Rate for SaaS? Benchmarks by Segment
Benchmarks by customer segment, and the fastest ways to lower yours.
Which SaaS Metric Should You Check When?
A founder's comparison guide to MRR, CAC payback, LTV:CAC, churn, burn rate, and Rule of 40.
MRR vs ARR: What's the Difference and When to Use Each
A practical explainer for founders reporting revenue to investors.
What's a Good CAC Payback Period in 2026?
Benchmarks by stage, and how to improve yours.
The Rule of 40, Explained for Non-Finance Founders
Why investors care about this one number more than almost any other.
More guides are in progress — subscribe on the homepage to get notified when they publish. Real Estate articles will follow that section's launch.