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In-depth articles on finance, health, construction and more — every one linked to the free calculator that runs the math.
Long-form articles on the math behind the numbers — how to calculate it, why it matters, and which calculator to reach for. New posts weekly; archives by topic below. The chronological feed lives below the cluster routing.
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Money & finance writing
How mortgages, taxes, and compound interest actually work — articles that explain the formula.
Health & fitness writing
BMI, calories, protein, heart-rate zones — what each metric actually measures.
Business & math writing
Break-even analysis, business metrics, ROI, and the statistics fundamentals.
Construction & environment writing
Material estimation, carbon footprint math, and the everyday environmental tradeoffs.
Latest Articles
Fresh from the blogWhich College Majors Actually Pay for Themselves
Same $100k degree, but once you count forgone wages and loan interest the payback runs from 10 years for computer engineering to 45 for elementary education — and 3 majors never break even.
12 min readCollege Major ROI NEW30-Year vs 15-Year Mortgage: The True Cost by Metro
We ran the numbers across 17 major U.S. metros: a 30-year mortgage costs the typical American $227,471 more in interest than a 15-year — and nearly $1M more in San Jose.
13 min readMortgage Calculator NEWPregnancy Weight Gain: Week-by-Week Guidelines
Evidence-based weight gain targets by trimester and BMI category, plus calorie needs, worked examples, and what to do if you're off track.
10 min readPregnancy Weight Calculator NEWUnderstanding Blood Pressure Numbers and Risk Categories
Learn what your blood pressure numbers mean, how systolic and diastolic readings are classified, and what lifestyle changes can lower your risk.
8 min readBlood Pressure Calculator NEWLandscaping Cost Calculators: Mulch, Sod, and Topsoil
Estimate landscaping material costs for mulch, sod, topsoil, and gravel with coverage formulas and price-per-unit breakdowns.
8 min readMulch CalculatorLooking for guides, comparisons, and glossary terms? Explore all resources
Pregnancy Weight Gain: Week-by-Week Guidelines
Evidence-based weight gain targets by trimester and BMI category, plus calorie needs, worked examples, and what to do if you're off track.
10 min readPregnancy Weight CalculatorUnderstanding Blood Pressure Numbers and Risk Categories
Learn what your blood pressure numbers mean, how systolic and diastolic readings are classified, and what lifestyle changes can lower your risk of hypertension.
8 min readBlood Pressure CalculatorLandscaping Cost Calculators: Mulch, Sod, and Topsoil
Estimate landscaping material costs for mulch, sod, topsoil, and gravel. Includes coverage formulas, price-per-unit breakdowns, and money-saving tips for DIY projects.
8 min readMulch CalculatorBilt 2.0 Calculator: Find Your Best Card & Maximize Points on Rent
Compare Bilt Blue, Obsidian, and Palladium cards. Find the earning path that maximizes your points on rent and everyday spending.
8 min readBilt 2.0 RewardsQuarterly Estimated Taxes: When, How Much, and How to Pay
A complete guide to quarterly estimated taxes for freelancers and self-employed workers in 2026: due dates, safe harbor rules, payment methods, and how to avoid penalties.
8 min readIncome Tax CalculatorSelf-Employment Tax: The Complete 2026 Guide
Everything you need to know about self-employment tax in 2026: rates, how to calculate, deductions, quarterly payments, and how to reduce what you owe.
9 min readIncome Tax CalculatorHow Compound Interest Works: The Complete Guide
Understand the formula behind compound interest, how compounding frequency changes your returns, and when compounding works against you.
7 min readCompound InterestMortgage vs Renting in 2026: A Complete Financial Breakdown
Compare the true cost of buying versus renting, including hidden expenses, opportunity cost, and the break-even timeline.
7 min readRent vs BuyUnderstanding Your Tax Bracket: How Federal Income Tax Really Works
Clear up the biggest misconception in personal finance: marginal vs effective tax rates, and how the 2025 brackets actually apply to your income.
7 min readIncome TaxThe Science of Calorie Deficits: How Weight Loss Actually Works
Learn the energy balance equation, how BMR formulas estimate your metabolism, safe deficit ranges, and why adaptive thermogenesis matters.
7 min readCalorie DeficitConstruction Material Estimating: Calculate Before You Build
Save money and avoid waste by estimating concrete, brick, and other materials accurately before your next project breaks ground.
6 min readConcrete CalculatorWhat Is a Good Debt-to-Income Ratio? 2026 Lender Guidelines
Learn what DTI means, how to calculate yours, and the lender thresholds that determine whether you qualify for a mortgage.
7 min readMortgage CalculatorHow Much House Can I Afford on My Salary?
Use the 28/36 rule and real lender criteria to find your maximum home purchase price based on your salary.
8 min readMortgage CalculatorRoth IRA vs 401(k): Which Is Better for Your Tax Situation?
Compare tax treatment, contribution limits, employer matching, and withdrawal rules to choose the right retirement account.
8 min readRoth IRA CalculatorHow to Calculate Your Net Worth (and Why It Matters)
Calculate your net worth by subtracting liabilities from assets, and benchmark it against age-based averages.
6 min readBudget PlannerEmergency Fund: How Much Is Enough?
Determine exactly how much emergency savings you need based on your expenses, job stability, and household situation.
6 min readBudget PlannerFIRE Number: How to Know When You Can Retire Early
Calculate your FIRE number using the 4% rule and determine exactly how many years until financial independence.
7 min readFIRE CalculatorThe True Cost of a Car: What Dealers Don’t Tell You
Discover the hidden costs of car ownership: depreciation, insurance, maintenance, and why the sticker price is just the beginning.
7 min readBudget PlannerHow Credit Card Interest Works (and Why Minimum Payments Are a Trap)
Understand how daily compounding makes credit card debt spiral, and why minimum payments are designed to keep you in debt.
7 min readCompound InterestWhat Is Capital Gains Tax and How Do You Calculate It?
Understand capital gains tax rates, the difference between short-term and long-term gains, and strategies to reduce your tax bill.
7 min readCapital Gains TaxWhat Is a Healthy BMI? Understanding Your Number
Understand what BMI measures, what the four categories mean, and why you should consider other metrics too.
6 min readBMI CalculatorTDEE vs BMR: What’s the Difference and Which Should You Use?
Understand the difference between BMR and TDEE, and know which number to use for weight loss, maintenance, or muscle gain.
6 min readTDEE CalculatorHow Many Calories Should I Eat to Lose Weight?
Calculate your exact calorie target for weight loss based on your TDEE, activity level, and weight loss goals.
7 min readCalorie DeficitHow Much Protein Do You Actually Need Per Day?
Calculate your daily protein needs based on body weight, fitness goals, and activity level with food source recommendations.
6 min readProtein CalculatorWhat Body Fat Percentage Is Healthy for Your Age?
Discover healthy body fat ranges by age and sex, with measurement methods and strategies to improve body composition.
6 min readBMI CalculatorBreak-Even Analysis: The Calculation Every Business Owner Needs
Calculate your break-even point to know exactly how many units you need to sell before your business starts making profit.
7 min readBreak-Even CalculatorWhat Is SaaS Churn Rate and How to Calculate It?
Calculate customer and revenue churn rates for your SaaS business and compare against industry benchmarks.
6 min readLTV CalculatorCAC vs LTV: The Single Most Important Ratio for SaaS
Understand the LTV to CAC ratio and why it determines whether your business can scale profitably.
6 min readCAC CalculatorHow to Calculate Percentage Change (The Non-Confusing Way)
Master the percentage change formula with clear examples for increase, decrease, and the common math pitfalls to avoid.
5 min readPercentage CalculatorHow to Calculate Standard Deviation (With and Without a Calculator)
Step-by-step guide to calculating standard deviation and understanding what it reveals about data variability.
7 min readStandard DeviationP-Value Explained: What It Means and When to Reject the Null
Understand what p-values mean, the 0.05 significance threshold, and the most common misinterpretations in statistics.
7 min readP-Value CalculatorHow to Calculate Your Savings Rate (And Why It Matters More Than Income)
Learn how to calculate your savings rate and why it matters more than income for building long-term wealth.
7 min readBudget PlannerAPR vs APY: What Is the Difference and Why It Matters
Understand why APR and APY are different and which rate to compare when shopping for financial products.
7 min readAPY/APR CalculatorAmortization Schedules Explained: How Loan Payments Really Work
Understand how loan amortization works and how extra payments can save you tens of thousands.
7 min readAmortization CalculatorHow 401(k) Employer Match Works: Free Money You Might Be Missing
Understand how 401(k) matching works and why not getting the full match is leaving free money on the table.
7 min read401(k) CalculatorWhen Is Refinancing Your Mortgage Worth It?
Calculate whether refinancing makes financial sense based on your rate drop, closing costs, and how long you plan to stay.
7 min readRefinance CalculatorHow to Calculate Return on Investment (ROI)
Learn the ROI formula, understand CAGR vs simple ROI, and avoid pitfalls that make return calculations misleading.
7 min readROI CalculatorUnderstanding PMI: When It Applies and How to Remove It
Learn what PMI is, when it is required, how much it costs, and the fastest strategies to remove it.
6 min readDown Payment CalculatorSales Tax by State: 2026 Complete Guide
Find your state and local sales tax rate for 2026 with this complete guide to all 50 states.
7 min readSales Tax CalculatorHow Inflation Erodes Your Savings (And What to Do About It)
Understand how inflation reduces purchasing power and what investment strategies keep you ahead of rising prices.
7 min readInflation CalculatorHow to Calculate Your Macros for Any Goal
Calculate protein, carb, and fat targets for weight loss, muscle gain, or maintenance using TDEE-based formulas.
7 min readMacro CalculatorHeart Rate Zones: Complete Training Guide
Learn the five heart rate zones, how to find your max heart rate, and which zone matches your fitness goal.
7 min readTDEE CalculatorBMI Limitations: Better Alternatives for Measuring Health
Understand why BMI falls short and discover better metrics for assessing body composition and health risk.
7 min readBMI CalculatorHow Due Dates Are Calculated (And Why They Are Often Wrong)
Understand how due dates are calculated, why only 4% of babies arrive on time, and what the real delivery window looks like.
6 min readPregnancy CalculatorUnderstanding One Rep Max: Calculate and Train Safely
Calculate your 1RM with proven formulas and learn how to use training percentages for effective strength programming.
7 min read1RM CalculatorHow to Calculate Concrete Needed for Your Project
Calculate concrete volume for slabs, footings, and posts with formulas, bag counts, and waste factor guidelines.
6 min readConcrete CalculatorUnderstanding Roof Pitch: What It Means for Your Home
Learn what roof pitch means, common residential pitches, and how pitch affects roofing materials and costs.
6 min readConcrete CalculatorLED vs Traditional Lighting: Calculate Your Savings
Compare LED, CFL, and incandescent costs including electricity and replacement over the lifetime of each bulb.
6 min readLED Resistor CalculatorMarkup vs Margin: Why the Difference Matters for Your Business
Understand why markup and margin are different numbers and how confusing them costs businesses real money.
6 min readMarkup CalculatorHow to Price Freelance Work Without Undervaluing Yourself
Calculate the right freelance rate based on salary equivalents and stop undercharging for your work.
7 min readSalary CalculatorDiscount Strategies: BOGO, Stacked Discounts, and Margin Impact
Understand the true margin impact of BOGO, stacked discounts, and volume pricing before running your next promotion.
7 min readDiscount CalculatorHow Much Coffee Is Too Much? The Science of Caffeine
Understand safe caffeine limits, how genetics affect metabolism, and the optimal timing for coffee consumption.
7 min readCoffee CalculatorElectric vs Gas Car: 5-Year True Cost Comparison
Compare the 5-year total cost of owning an electric vs gas vehicle including fuel, maintenance, insurance, and depreciation.
7 min readBudget PlannerThe Complete Guide to Tipping in 2026
The definitive guide to tipping: who to tip, how much, and quick mental math methods for calculating tips.
6 min readBudget PlannerWhat Is Correlation? Understanding r-values in Statistics
Understand what r-values measure, how to interpret correlation strength, and the critical difference between correlation and causation.
7 min readCorrelation CalculatorThe Normal Distribution: Why Everything Follows a Bell Curve
Understand why the bell curve appears everywhere in nature and how the 68-95-99.7 rule makes statistics intuitive.
7 min readNormal Distribution CalculatorNo articles match your search.
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The blog is the chronological feed of new articles. Learn is the consolidated index across the entire site (blog + guides + topics + comparisons), filterable by category and type. Use blog when you want what's new; use Learn when you want a specific topic.
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Do blog posts get updated?
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