Resources & Guides

84 practical guides explaining the formulas behind the numbers — plus our weekly NNNG Wire news beat covering the events that move the math.

⭐ Hub Guides 4 comprehensive guides

⭐ Hub Guide
Complete Guide to Home Buying Math
Every calculation you need to buy a home — affordability, mortgage payments, DTI, closing costs, PMI, refinancing, and more. 20+ calculators linked.
May 202620 min read
⭐ Hub Guide
Understanding Your Body: Every Health Metric Explained
BMI, body fat, TDEE, heart rate zones, blood pressure, macros, hydration, sleep — every number your body produces, explained. 30+ calculators linked.
May 202620 min read
⭐ Hub Guide
Financial Independence by the Numbers
Compound interest, FIRE number, Roth vs Traditional, net worth, debt payoff, and withdrawal planning — every calculation for financial freedom. 25+ calculators linked.
May 202622 min read
⭐ Hub Guide
DIY Homeowner’s Math Toolkit
Concrete, decking, roofing, flooring, paint, HVAC, fencing, drywall — every construction calculation a homeowner needs. 35+ calculators linked.
May 202618 min read

📡 News & Wire 6 recent posts · View full archive →

📡 Wire · Tax
IRS Announces 135-Day Settlement Window for Conservation Easement Disputes
A new IRS initiative (IR-2026-65) gives eligible taxpayers a defined off-ramp from contested syndicated easement deductions. 90 days at standard terms, then a 45-day extension.
May 13, 20263 min read
📡 Wire · Inflation
April CPI Hit 3.8% — Here's What That Actually Means for Your Tax Bill
The hottest annual CPI reading in nearly three years doesn't just affect gas prices. Our take on what it means for 2027 tax brackets, Fed rate math, and your real take-home pay.
May 12, 20263 min read
📡 Wire · Jobs
April Jobs Report: Payrolls Add 115,000, Unemployment Holds at 4.3%
Hiring beat the 65,000 consensus, led by health care and warehousing. Wage growth slowed to 3.6% year-over-year. The full BLS Employment Situation breakdown.
May 8, 20263 min read
📡 Wire · Mortgage
Mortgage Rates Climb to 6.37% — How to Run the Numbers This Week
Freddie Mac's weekly PMMS reading rose for a second straight week. What 7 basis points actually costs on a $400,000 loan, plus the affordability and 15-vs-30 math.
May 7, 20263 min read
📡 Wire · Small Biz
IRS Small Business Week 2026 — Three Calculators That Pair With the New Tools
The IRS announced new self-service tools and webinars (IR-2026-61) for self-employed filers. Here are the three NNNG calculators that turn the rules into actual numbers.
May 6, 20263 min read
📡 Wire · Fed
Four Fed Dissents and No Cuts — What That Tells Us About Your Mortgage
The April FOMC hold was expected. The 8-4 dissent split — the largest since October 1992 — was not. What a divided Fed means for the rate-cut timeline.
April 30, 20263 min read

💰 Finance 14 articles

💰 Finance
Compound Interest Explained
Why Einstein called it the eighth wonder — with the real numbers that show why starting early matters so much.
January 20265 min read
💰 Finance
Tax Bracket Math: How Federal Income Tax Actually Works
A clear explanation of marginal vs effective tax rates with worked examples, 2026 federal tax brackets, and common tax misunderstandings that cost people money.
January 20267 min read
💰 Finance
What Is a Good Debt-to-Income Ratio?
DTI thresholds by loan type, what lenders actually look for, and the most effective ways to lower your ratio.
January 20266 min read
💰 Finance
How Credit Scores Actually Work: The Math Behind the Number
Understand exactly how your credit score is calculated with FICO's five factors, their real weights, and data-backed strategies to improve your credit fast.
January 20267 min read
💰 Finance
Roth vs Traditional IRA: The Real Math
Concrete scenarios at different income levels — beyond the "it depends on your tax rate" non-answer.
January 20268 min read
💰 Finance
How to Calculate Your Net Worth (And Why It Matters More Than Income)
Step-by-step guide to calculating your net worth with real benchmarks by age, common mistakes, and why net worth is a better measure of financial health than salary.
January 20266 min read
💰 Finance
What Is Dollar-Cost Averaging and Does It Actually Work?
The math behind DCA, when lump-sum investing actually beats it, and real historical scenarios showing both strategies head to head.
February 20265 min read
💰 Finance
The Real Math Behind Dividend Investing
Yield calculations, the power of DRIP, dividend growth vs high yield, tax implications, and why total return matters more than income alone.
January 20267 min read
💰 Finance
How Much Life Insurance Do I Actually Need?
The DIME method, income replacement formulas, and a step-by-step calculation that accounts for debts, education, and survivor needs.
February 20266 min read
💰 Finance
Term vs Whole Life Insurance: The Math Nobody Shows You
A side-by-side comparison with real premium data, the buy-term-invest-the-difference calculation, and when each type actually makes sense.
February 20267 min read
💰 Finance
Emergency Fund: How Much Do You Actually Need?
The right emergency fund size for your situation, where to store it for maximum return, and how to build it fast.
January 20266 min read
💰 Finance
Debt Avalanche vs Snowball: Which Method Pays Off Faster?
The math on both debt repayment methods — real examples, total interest differences, and how to choose based on your psychology and situation.
January 20266 min read
💰 Finance
Student Loan Payoff Strategies: The Math Behind Every Option
Compare every student loan payoff strategy with real numbers: standard vs income-driven, refinancing math, forgiveness programs, and extra payment calculators.
February 20268 min read
💰 Finance
How to Build a Retirement Plan by the Numbers
A data-driven guide with real calculations for your savings target, the 4% rule, Social Security timing, and common mistakes that cost retirees thousands.
February 20269 min read

🏡 Real Estate & Mortgages 10 articles

🏡 Real Estate
How Much House Can You Actually Afford?
Beyond the 28% rule: the true monthly cost of homeownership and a sanity check before you start shopping.
January 20268 min read
🏡 Real Estate
15-Year vs 30-Year Mortgage: The Real Cost Difference
A side-by-side comparison: monthly payments, total interest, rate differences, and which makes sense for your financial situation in 2026.
January 20267 min read
🏡 Real Estate
How to Compare Mortgage Offers Like a Pro
Understand APR vs rate, how discount points work, lender fees, the break-even calculation, and the total cost comparison that reveals the best offer.
February 20267 min read
🏡 Real Estate
How to Calculate If Refinancing Is Worth It
Break-even analysis, closing cost math, and the scenarios where refinancing saves — or costs — you money.
February 20266 min read
🏡 Real Estate
Should You Pay Off Your Mortgage Early?
When paying extra on your mortgage makes sense — and when investing that money beats it. With the real break-even for your rate.
February 20266 min read
🏡 Real Estate
Renting vs Buying a Home in 2026: The Complete Financial Analysis
Breakeven timeline, total cost analysis, the investment opportunity cost of a down payment, and when each option wins financially.
February 20268 min read
🏡 Real Estate
HELOC vs Cash-Out Refinance: Which Is Better?
Rates, costs, tax implications, repayment structure, and which option makes sense for home improvements, debt consolidation, and other goals.
February 20267 min read
🏡 Real Estate
How to Calculate Rental Property ROI
Cap rate, cash-on-cash return, and GRM explained — with the hidden costs that kill most beginner analyses.
January 20267 min read
🏡 Real Estate
House Hacking: How to Live for Free (or Nearly Free)
The strategy, math, and financing behind living in one unit and renting the rest to cover your mortgage.
February 20267 min read
☀️ Energy
Solar Panel Payback Period: What's Realistic in 2026?
The federal tax credit, regional production differences, and realistic payback ranges across the US.
January 20266 min read

💼 Business 4 articles

💼 Business
How to Calculate Your Freelance Rate (The Real Math)
The complete formula that accounts for taxes, benefits, unbillable time, and overhead — not just desired income.
January 20267 min read
💼 Business
The 5 SaaS Metrics Every Founder Must Know
MRR, ARR, churn, LTV, and CAC explained clearly — with the benchmarks that separate healthy businesses from troubled ones.
January 20267 min read
💼 Business
How to Value a Small Business Before Selling
The three standard valuation methods, industry multiples, and what buyers actually look at beyond revenue.
February 20267 min read
💼 Business
LLC vs S-Corp: At What Income Does the Switch Make Sense?
The precise income threshold where an S-Corp election starts saving more money than it costs — with real numbers for different income levels.
February 20267 min read

❤️ Health & Fitness 12 articles

❤️ Health
What Is TDEE and Why It Matters
The foundation of any nutrition plan, how it's calculated, and how to use it for fat loss, muscle gain, or maintenance.
January 20266 min read
❤️ Health
How to Calculate Your Calorie and Macro Needs
Step-by-step guide using BMR formulas, activity multipliers, and macronutrient ratios for weight loss, maintenance, and muscle gain.
January 20267 min read
❤️ Health
Complete Guide to Protein Intake: How Much Do You Need?
How much protein you need based on your goals, body weight, and activity level. Covers optimal timing, complete vs incomplete proteins, and high-protein food sources.
May 20267 min read
❤️ Health
How to Interpret Your BMI
What BMI actually measures, when it's misleading, and which metrics give a more complete health picture.
January 20265 min read
❤️ Health
BMI vs Body Fat Percentage: Which Metric Actually Matters?
A comparison of BMI and body fat percentage: what each measures, when BMI is misleading, and how to measure body fat accurately.
January 20266 min read
❤️ Health
Body Composition Explained: BMI, Body Fat, and Lean Mass
Understand body composition beyond the scale: body fat percentage, lean body mass, waist-to-hip ratio, and which metrics best predict health outcomes.
January 20266 min read
❤️ Health
Heart Rate Zones Explained: How to Train Smarter with Data
The five heart rate training zones, how to calculate your max heart rate, which zone burns the most fat, and why most people train in the wrong zone.
January 20267 min read
❤️ Health
Understanding Blood Pressure: What Your Numbers Mean
What systolic and diastolic numbers mean, how to read your results, what counts as normal vs high, and evidence-based ways to manage blood pressure.
May 20267 min read
❤️ Health
How to Read a Blood Panel: Every Number Explained
A plain-language guide to understanding your blood test results: what each marker means, normal ranges, and when to be concerned.
February 20268 min read
❤️ Health
Which Intermittent Fasting Schedule Is Right for You?
16:8, 20:4, 5:2, and alternate-day fasting compared — the research, the results, and how to pick the one you'll actually stick with.
February 20266 min read
❤️ Health
How Much Water You Actually Need: A Science-Based Guide
Why 8 glasses is a myth, how exercise and climate change your needs, signs of dehydration, and how to calculate your personal water intake.
February 20266 min read
❤️ Health
The Science of Sleep: How Much You Need and What Happens Without It
Sleep cycles, how much sleep you actually need by age, the real cost of sleep debt, caffeine timing, and data-backed strategies for better sleep.
February 20267 min read

🧬 Peptides & GLP-1 5 articles

🧬 Peptides
What Is a GLP-1? How GLP-1 Receptor Agonists Work
An accessible explanation of how GLP-1 drugs like Ozempic and Wegovy actually work — the biology of appetite, satiety, and why these medications are transforming obesity treatment.
January 20267 min read
🧬 Peptides
Semaglutide vs Tirzepatide: Which Produces More Weight Loss?
A data-driven comparison of Ozempic/Wegovy vs Mounjaro/Zepbound — clinical trial outcomes, side effects, dosing, and who should consider each.
January 20268 min read
🧬 Peptides
BPC-157 Dosing Guide: How to Calculate Your Dose
Complete BPC-157 dosing reference — how to reconstitute, optimal doses for different goals, injection sites, and what the research shows.
January 20267 min read
🧬 Peptides
How to Reconstitute Peptides: Complete Step-by-Step Guide
Everything you need to know about mixing lyophilized peptides with bacteriostatic water — equipment, technique, storage, and the math explained clearly.
January 20266 min read
🧬 Peptides
Peptide Storage Guide: Refrigerator vs Freezer
How to store lyophilized and reconstituted peptides correctly — temperature requirements, shelf life by peptide, and common storage mistakes to avoid.
January 20265 min read

📐 Math & Science 8 articles

📐 Math
How Percentages Work: A Complete Guide
Master percentage calculations, conversions between fractions and decimals, percentage change, markup, discount, and tip formulas.
April 20267 min read
📐 Math
Understanding Standard Deviation: What It Tells You About Data
What standard deviation means in plain language. The 68-95-99.7 rule, comparing datasets, and applying standard deviation in finance, science, and everyday decisions.
April 20267 min read
📐 Math
Statistics Explained: Mean, Standard Deviation, Z-Scores, and Probability
A clear guide to essential statistics concepts with real-world examples — mean, median, mode, z-scores, normal distribution, and basic probability.
February 20267 min read
📐 Math
How to Solve Quadratic Equations: Three Methods
Master factoring, the quadratic formula, and completing the square with worked examples, plus real-world applications.
April 20266 min read
📐 Math
The Pythagorean Theorem Explained: Formula, Proofs, and Real-World Uses
The formula a² + b² = c², Pythagorean triples, distance calculations, and practical uses in construction, navigation, and design.
April 20266 min read
📐 Math
How to Calculate Area and Volume for Any Shape
Formulas for rectangles, circles, triangles, spheres, cylinders, cones, and irregular shapes with worked examples and real-world applications.
April 20266 min read
🔬 Science
Ohm's Law Explained: Voltage, Current, and Resistance
Understand V = IR with practical examples. How voltage, current, and resistance relate, calculating power, and applying electrical formulas to real circuits.
April 20266 min read
🔬 Science
Understanding Half-Life: From Medicine to Nuclear Physics
What half-life means in physics, medicine, and chemistry. Radioactive decay, drug elimination, carbon-14 dating, and how to calculate remaining quantities.
April 20265 min read

🔨 Construction & Home 6 articles

🔨 Construction
How to Estimate Construction Materials: Concrete, Lumber, and More
Formulas for concrete, lumber, drywall, paint, tile, gravel, and mulch with waste factors, cost estimation, and common mistakes.
February 20268 min read
🔨 Construction
How to Calculate Concrete for Any Project
Concrete quantities for patios, driveways, footings, and post holes. Covers cubic yard conversions, thickness guidelines, ordering tips, and cost estimation.
April 20266 min read
🔨 Construction
Complete Guide to Roof Measurements and Pitch
How to measure roof pitch, calculate roof area, and estimate materials for shingles, metal roofing, and underlayment with pitch multiplier tables.
April 20266 min read
🔨 Construction
How to Plan a Deck Build: Materials, Costs, and Calculations
Sizing, material calculations for lumber and hardware, cost estimation, footing requirements, stair layout, and building code considerations.
April 20266 min read
🔨 Construction
HVAC Sizing Guide: How to Calculate BTU and Tonnage
BTU calculations, tonnage, room-by-room load analysis, climate zones, and common mistakes that lead to oversized or undersized equipment.
April 20266 min read
🔨 Construction
Flooring Guide: Tile, Carpet, Hardwood, and LVP
How to calculate square footage, account for waste, estimate costs, and plan your flooring installation for any material type.
April 20266 min read

🏠 Everyday Life 8 articles

🏠 Everyday
EV vs Gas Car: The Complete Financial Comparison
Total cost of ownership over 5, 7, and 10 years — purchase price, fuel, maintenance, insurance, depreciation, and when the EV payoff actually kicks in.
February 20267 min read
🏠 Everyday
The True Cost of Owning a Car (It's Not Your Payment)
Insurance, depreciation, maintenance, gas, registration, and the hidden costs that make car ownership far more expensive than the monthly payment.
February 20266 min read
🏠 Everyday
How GPA Is Calculated: Weighted vs Unweighted Explained
Exactly how GPA is calculated on 4.0 and 5.0 scales. Weighted vs unweighted GPA, cumulative vs semester, and strategies to raise your grade point average.
May 20266 min read
🏠 Everyday
How to Reduce Your Electricity Bill: A Data-Driven Guide
Which appliances cost the most, how to read your electric bill, and calculate exact savings from efficiency upgrades.
May 20266 min read
🏠 Everyday
How Much Caffeine Is Too Much? A Science-Based Guide
Safe caffeine limits from FDA and medical research. Caffeine content in coffee, tea, energy drinks, and supplements, plus half-life and timing.
May 20266 min read
🏠 Everyday
How to Budget for a Road Trip: Gas, Food, and Hidden Costs
Real cost breakdowns for gas, food, lodging, and hidden expenses. Calculate exact fuel costs and daily budgets for any route.
May 20265 min read
🏠 Everyday
Dog Years and Cat Years: How Pet Age Really Works
The 7:1 myth is wrong — the real science behind dog and cat aging, plus breed-specific life expectancy data.
May 20265 min read
🏠 Everyday
How Much Paint Do I Need? Room-by-Room Guide
Coverage rates, how to measure walls, and how many coats are required for different surfaces and color changes.
May 20265 min read

🔄 Conversions 4 articles

🔄 Conversions
Metric vs Imperial: Complete Conversion Guide
Metric-to-imperial conversions for length, weight, volume, and temperature. Includes quick reference tables, mental math shortcuts, and the history behind both systems.
May 20265 min read
🔄 Conversions
Cooking Measurement Conversions: Cups, Grams, Tablespoons
Quick-reference tables for cups to grams, tablespoons to teaspoons, metric to US, and ingredient-specific weight conversions for precise baking.
May 20265 min read
🔄 Conversions
Understanding Data Storage Units: Bytes to Terabytes
The difference between MB and GB, why drives show less space than advertised, and how to calculate your storage needs.
May 20265 min read
🔄 Conversions
International Shoe and Clothing Size Guide
Convert shoe and clothing sizes between US, UK, EU, and Asian sizing systems. Measurement guides, brand variation tips, and charts for men, women, and children.
May 20265 min read

🕐 Date & Time 3 articles

🕐 Date & Time
How Time Zones Work: UTC, GMT, and the International Date Line
How time zones work, the difference between UTC and GMT, why the International Date Line exists, and how to convert times across zones.
May 20267 min read
🕐 Date & Time
The History and Science of Daylight Saving Time
Why daylight saving time was created, which countries use it, the health and economic effects, and the ongoing debate about making DST permanent.
May 20267 min read
🕐 Date & Time
How to Calculate Business Days and Working Hours
Calculate business days between two dates, account for holidays, and convert between working hours and calendar days for project planning.
May 20266 min read