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 Real Estate Agent Commission Works (And Who Pays It)
5–6% split between two agents — what it costs and how net proceeds are calculated.
Property Development Feasibility: How to Calculate Profit Before You Build
GDV, land, build, finance — the full formula and the margin a project needs to stack up.
Property Area Units: sqft, sqm, Acres, Marla & Kanal Explained
Every property measurement unit with conversion tables and worked examples.
How to Calculate EMI for Home & Personal Loans in 2026
The exact formula, worked through for a home loan and a personal loan.
What $10,000 in 2010 Is Worth Today in 2026
How compounding inflation quietly erodes purchasing power.
How Much Will ₹5,000/Month Become in 10, 15 & 20 Years?
A worked SIP example across three time horizons.
How to Calculate Discount, Tip and Split Bills Correctly
The right order of operations, no more confusion.
Ideal Weight, Body Fat & Water Intake Explained
Three body metrics, three real formulas, worked examples included.
How Your Pregnancy Due Date Is Calculated
Naegele's rule explained, week by week.
Cap Rate vs. Cash-on-Cash Return: Which Matters More?
Two rental-property metrics, two very different answers — with a worked example.
What Is a Good Gross Rent Multiplier (GRM)?
The fastest way to screen a rental property before running the full numbers.
Airbnb vs. Long-Term Rental: Which Investment Strategy Wins?
A worked comparison of the same property run both ways.
House Flipping ROI: What Profit Margin Should You Target?
How to calculate flip ROI correctly, and the risks that erode it fastest.
HELOC vs. Cash-Out Refinance: How to Tap Your Home Equity
The single number that decides which option is actually cheaper.
The Hidden Costs of Homeownership (Beyond the Mortgage)
Everything else that shows up in the real monthly cost of owning a home.
Closing Costs Explained: What Buyers Actually Pay
Where the money goes, and the total cash you'll need at closing.
Mortgage Points Explained: When Buying Down Your Rate Pays Off
How to find your break-even point before you pay for points.
Rent vs. Buy in 2026: How to Actually Run the Numbers
A full worked comparison, opportunity cost included.
2026 Insurance Premium Benchmarks: Auto, Home & Life Insurance Costs
National averages, state highs/lows, and life insurance rates by age.
2026 Mortgage Rate & Refinance Trends: What the Data Shows
Current rates, the lock-in effect, and forecasts through year-end.
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.