📘 Toolfyra Book Guides
Long-form handbooks, one chapter at a time — written to be read, not skimmed.
📘 Pack_T11A · 5 CHAPTERS
Capital Gains Tax Calculator: The Complete 2026 Guide
How capital gains tax actually works in 2025-2026: brackets, holding periods, NIIT, and th
📘 Pack_T11A · 5 CHAPTERS
How to Use the Capital Gains Tax Calculator (Worked Examples)
Six worked scenarios with real inputs and results: a middle-bracket sale, 0 percent bracke
📘 Pack_T11A · 5 CHAPTERS
Capital Gains Tax Calculator: 11 Mistakes, FAQs & Pro Tips
Eleven real capital gains mistakes — basis, holding periods, NIIT, exclusions — plus pro t
📘 Pack_T11A · 5 CHAPTERS
Self-Employment Tax Calculator: The Complete 2026 Guide
How the 15.3 percent self-employment tax works for 2025-2026: the 92.35 percent factor, th
📘 Pack_T11A · 5 CHAPTERS
How to Use the Self-Employment Tax Calculator (Worked Examples)
Six worked self-employment tax scenarios with real math: first-year freelancers, six-figur
📘 Pack_T11A · 5 CHAPTERS
Self-Employment Tax Calculator: 11 Mistakes, FAQs & Pro Tips
Eleven self-employment tax mistakes — gross-revenue errors, wage-base confusion, missed de
📘 Pack_T11A · 5 CHAPTERS
Quarterly Estimated Tax Calculator: The Complete 2026 Guide
Quarterly estimated taxes explained for 2026: who must pay, the 90/100/110 percent safe ha
📘 Pack_T11A · 5 CHAPTERS
How to Use the Quarterly Estimated Tax Calculator (Worked Examples)
Six worked estimated-tax scenarios: flat splits, prior-year safe harbors, the 110 percent
📘 Pack_T11A · 5 CHAPTERS
Quarterly Estimated Tax Calculator: 11 Mistakes, FAQs & Pro Tips
Eleven quarterly estimated tax mistakes — skipped first quarters, safe-harbor confusion, s
📘 Pack_T11A · 5 CHAPTERS
Estate Tax Calculator: The Complete 2026 Guide
How the federal estate tax works for 2025-2026: the 13.99-million-dollar exemption, the 40
📘 Pack_T11A · 5 CHAPTERS
How to Use the Estate Tax Calculator (Worked Examples)
Six worked estate tax scenarios with real math: estates under the exemption, portability,
📘 Pack_T11A · 5 CHAPTERS
Estate Tax Calculator: 11 Mistakes, FAQs & Pro Tips
Eleven estate tax mistakes — missed portability, forgotten life insurance, state-threshold
📘 Pack_T11A · 5 CHAPTERS
Gift Tax Calculator: The Complete 2026 Guide
How the gift tax works for 2025-2026: the 19,000-dollar annual exclusion, the 38,000 split
📘 Pack_T11A · 5 CHAPTERS
How to Use the Gift Tax Calculator (Worked Examples)
Six worked gift tax scenarios with real math: wedding cash, a 100,000-dollar down payment,
📘 Pack_T11A · 5 CHAPTERS
Gift Tax Calculator: 11 Mistakes, FAQs & Pro Tips
Eleven gift tax mistakes — routed tuition, skipped 709s, basis blindness, non-citizen spou
📘 Pack_T11B · 5 CHAPTERS
Interest-Only Mortgages in 2026: A Complete Borrower's Guide
How interest-only mortgages work in 2026: typical rates and structures, who benefits, how
📘 Pack_T11B · 5 CHAPTERS
Interest-Only Mortgage Worked Examples: Five Scenarios, Computed Line by Line
Five fully computed interest-only mortgage scenarios: monthly math, step-up payments, deca
📘 Pack_T11B · 5 CHAPTERS
Interest-Only Mortgage Mistakes, Edge Cases, and Pro Tips
The mistakes that sink interest-only mortgage borrowers, the edge cases most guides skip,
📘 Pack_T11B · 5 CHAPTERS
Land Loans in 2026: Rates, Down Payments, and Terms Explained
A complete 2026 guide to financing land: raw versus improved parcels, typical rates and do
📘 Pack_T11B · 5 CHAPTERS
Land Loan Worked Examples: Five Deals Computed Line by Line
Five fully computed land loan scenarios: raw acreage, an improved lot, recreational land,
📘 Pack_T11B · 5 CHAPTERS
Land Loan Mistakes, Edge Cases, and Pro Tips
The errors that turn land purchases into burdens: access easements, balloon surprises, per
📘 Pack_T11B · 5 CHAPTERS
RV Financing in 2026: Rates, Terms, and the 20-Year Question
A complete 2026 guide to RV loans: typical rates, terms up to 20 years, down payments, dep
📘 Pack_T11B · 5 CHAPTERS
RV Loan Worked Examples: Five Deals Computed Line by Line
Five fully computed RV financing scenarios: a Class C at 20 years, a used travel trailer,
📘 Pack_T11B · 5 CHAPTERS
RV Loan Mistakes, Edge Cases, and Pro Tips
The financing errors that trap RV owners: 20-year towables, financed add-ons, negative equ
📘 Pack_T11B · 5 CHAPTERS
Motorcycle Loans in 2026: Rates, Terms, and Smart Structure
A complete 2026 guide to motorcycle financing: typical rates of 7-14 percent, terms from 2
📘 Pack_T11B · 5 CHAPTERS
Motorcycle Loan Worked Examples: Five Deals Computed Line by Line
Five fully computed motorcycle financing scenarios: a new commuter, a used standard, a tou
📘 Pack_T11B · 5 CHAPTERS
Motorcycle Loan Mistakes, Edge Cases, and Pro Tips
The financing errors riders repeat: 84-month stretches, rolled-over negative equity, skipp
📘 Pack_T11B · 5 CHAPTERS
Boat Loans in 2026: Rates, Terms, and the 15-Year Ceiling
A complete 2026 guide to boat financing: typical rates, terms up to 15 years, survey and i
📘 Pack_T11B · 5 CHAPTERS
Boat Loan Worked Examples: Five Purchases Computed Line by Line
Five fully computed boat financing scenarios: a family cruiser, a pontoon, a flagship at t
📘 Pack_T11B · 5 CHAPTERS
Boat Loan Mistakes, Edge Cases, and Pro Tips
The financing errors that sink boat owners: payment-max purchases, skipped surveys, long t
📘 Pack_T12A · 5 CHAPTERS
Car Accident Settlement Calculator Guide 2026: How the Multiplier Method Really Works
How a car accident settlement calculator estimates value with the multiplier method, the r
📘 Pack_T12A · 5 CHAPTERS
Car Accident Settlement Calculator Worked Examples: Five Scenarios, Real Numbers
Five worked car accident settlement scenarios with realistic inputs and full arithmetic, f
📘 Pack_T12A · 5 CHAPTERS
Car Accident Settlement Mistakes and FAQ: Using a Calculator Without Fooling Yourself
The five mistakes that wreck car accident settlement estimates, the pro tips that sharpen
📘 Pack_T12A · 5 CHAPTERS
Personal Injury Settlement Calculator Guide 2026: The Method, the Ranges, the Reality
How personal injury settlement calculators work: the multiplier method explained, realisti
📘 Pack_T12A · 5 CHAPTERS
Personal Injury Settlement Calculator Worked Examples: Five Claims From the Ground Up
Five personal injury scenarios worked through the multiplier method with realistic inputs
📘 Pack_T12A · 5 CHAPTERS
Personal Injury Settlement Mistakes and FAQ: Where Estimates Go Wrong
The five mistakes that distort personal injury settlement estimates, pro tips that sharpen
📘 Pack_T12A · 5 CHAPTERS
Wrongful Termination Settlement Calculator Guide 2026: Components, Ranges, Reality
How a wrongful termination settlement calculator works: back pay, front pay, and distress
📘 Pack_T12A · 5 CHAPTERS
Wrongful Termination Settlement Calculator Worked Examples: Five Cases in Months of Salary
Five wrongful termination scenarios worked through back pay, mitigation, front pay, and di
📘 Pack_T12A · 5 CHAPTERS
Wrongful Termination Settlement Mistakes and FAQ: Estimate Smarter, Negotiate saner
Five mistakes that distort wrongful termination settlement estimates — from ignoring mitig
📘 Pack_T12A · 5 CHAPTERS
Severance Pay Calculator Guide 2026: Benchmarks, Benchmarks' Limits, and the Deal Around the Number
How a severance pay calculator works: the weeks-per-year benchmarks, who is actually legal
📘 Pack_T12A · 5 CHAPTERS
Severance Pay Calculator Worked Examples: Five Offers, Benchmarked to the Last Dollar
Five severance scenarios with realistic inputs and complete arithmetic — short tenure, mid
📘 Pack_T12A · 5 CHAPTERS
Severance Pay Mistakes and FAQ: What People Get Wrong When the Offer Lands
The five mistakes people make with severance offers — from assuming an entitlement to sign
📘 Pack_T12A · 5 CHAPTERS
Property Tax Estimator Guide 2026: The Formula, the State Spread, and What Assessors Actually Do
How a property tax estimator works: market value to assessed value to millage, realistic e
📘 Pack_T12A · 5 CHAPTERS
Property Tax Estimator Worked Examples: Five Bills From Market Value to Monthly Escrow
Five property tax scenarios with realistic inputs and complete arithmetic — plain millage,
📘 Pack_T12A · 5 CHAPTERS
Property Tax Mistakes and FAQ: The Estimation Errors That Cost Owners Real Money
Five property tax estimation mistakes — from listing-price inputs to forgotten exemptions
📘 Pack_T12B · 5 CHAPTERS
FSA Calculator Guide 2026: Plan Your Flexible Spending Account
A practical 2026 guide to flexible spending accounts: the roughly $3,300 health FSA limit,
📘 Pack_T12B · 5 CHAPTERS
FSA Calculator Worked Examples: Six 2026 Scenarios With Real Math
Six worked FSA scenarios for 2026: max election, right-sized elections, grace period vs ca
📘 Pack_T12B · 5 CHAPTERS
FSA Mistakes and FAQ: Avoid Forfeiture and Missed Savings in 2026
The seven most common FSA mistakes, from maxing without a baseline to grace-period confusi
📘 Pack_T12B · 5 CHAPTERS
PMI Removal Calculator Guide 2026: The 80 Percent and 78 Percent Rules Explained
A 2026 guide to removing private mortgage insurance: the 80% request rule, the 78% automat
📘 Pack_T12B · 5 CHAPTERS
PMI Removal Worked Examples: Six Scenarios With the Math Shown
Six PMI removal scenarios with full arithmetic: a 93% LTV purchase, extra principal, appra
📘 Pack_T12B · 5 CHAPTERS
PMI Removal Mistakes and FAQ: Costly Errors and How to Avoid Them
The most common PMI removal mistakes, from waiting for automatic termination to misreading
📘 Pack_T12B · 5 CHAPTERS
Insurance Premium Calculator Guide 2026: How Insurers Build Your Price
A 2026 guide to how insurance premiums are built: base rates, per-$1,000 pricing, age and
📘 Pack_T12B · 5 CHAPTERS
Insurance Premium Worked Examples: Six Scenarios With the Math Shown
Six premium calculations with full arithmetic: term life pricing per $1,000, age-band effe
📘 Pack_T12B · 5 CHAPTERS
Insurance Premium Mistakes and FAQ: Where Shoppers Overpay
Common premium mistakes, from comparing mismatched quotes to ignoring payment modes and ri
📘 Pack_T12B · 5 CHAPTERS
Disability Insurance Calculator Guide 2026: Sizing Income Protection
A 2026 guide to disability insurance math: replacing 60 percent of income, taxable vs tax-
📘 Pack_T12B · 5 CHAPTERS
Disability Insurance Worked Examples: Six Scenarios With the Math Shown
Six disability coverage calculations with full arithmetic: group coverage gaps, benefit st
📘 Pack_T12B · 5 CHAPTERS
Disability Insurance Mistakes and FAQ: Gaps That Show Up at Claim Time
The most common disability coverage mistakes, from trusting group plans to misjudging elim
📘 Pack_T12B · 5 CHAPTERS
Life Insurance Needs Calculator Guide 2026: The DIME Method and Beyond
A 2026 guide to sizing life insurance: the DIME method, income replacement ratios, what to
📘 Pack_T12B · 5 CHAPTERS
Life Insurance Needs Worked Examples: Six Households, Six Numbers
Six life insurance needs calculations with full arithmetic: DIME for a young family, ratio
📘 Pack_T12B · 5 CHAPTERS
Life Insurance Mistakes and FAQ: Sizing Errors That Cost Families
Common life insurance sizing mistakes, from salary multiples to double-counted group cover
📘 Pack_T13A · 5 CHAPTERS
ROAS: The 2026 Guide to Return on Ad Spend
What ROAS measures, how break-even ROAS works, which benchmarks are commonly cited, and ho
📘 Pack_T13A · 5 CHAPTERS
ROAS Worked Examples: Six Scenarios With the Arithmetic Shown
Six ROAS scenarios worked step by step: single campaigns, break-even checks, channel compa
📘 Pack_T13A · 5 CHAPTERS
ROAS Mistakes and FAQ: Where Return-on-Ad-Spend Analysis Goes Wrong
The common ROAS mistakes — revenue read as profit, trusting one attribution source, judgin
📘 Pack_T13A · 5 CHAPTERS
CAC: The 2026 Guide to Customer Acquisition Cost
What CAC measures, what belongs in the numerator, paid versus blended views, payback perio
📘 Pack_T13A · 5 CHAPTERS
CAC Worked Examples: Six Scenarios With the Arithmetic Shown
Six customer acquisition cost scenarios worked step by step: simple CAC, fully loaded CAC,
📘 Pack_T13A · 5 CHAPTERS
CAC Mistakes and FAQ: Where Acquisition-Cost Analysis Goes Wrong
Common CAC mistakes — undercounted spend, mismatched time windows, signups counted as cust
📘 Pack_T13A · 5 CHAPTERS
Customer Lifetime Value: The 2026 Guide to Estimating CLV
How to estimate customer lifetime value honestly: the historic formula, the churn-based fo
📘 Pack_T13A · 5 CHAPTERS
Customer Lifetime Value Worked Examples: Six Scenarios, Arithmetic Shown
Six CLV scenarios worked step by step: the historic retail formula, churn-based subscripti
📘 Pack_T13A · 5 CHAPTERS
CLV Mistakes and FAQ: Where Lifetime-Value Estimates Go Wrong
Common customer lifetime value mistakes — revenue read as profit, forever horizons, blende
📘 Pack_T13A · 5 CHAPTERS
The Debt Avalanche: A 2026 Guide to Paying Off Debt by Interest Rate
How the debt avalanche works: rank debts by APR, pay minimums plus one concentrated extra,
📘 Pack_T13A · 5 CHAPTERS
Debt Avalanche Worked Examples: Six Scenarios With the Arithmetic Shown
Six debt avalanche scenarios worked step by step: ordering two cards, ranking three debts,
📘 Pack_T13A · 5 CHAPTERS
Debt Avalanche Mistakes and FAQ: Where Payoff Plans Go Wrong
Common debt avalanche mistakes — diluted extra payments, negative amortization, ignored pr
📘 Pack_T13A · 5 CHAPTERS
Airbnb Profit: The 2026 Guide to Short-Term Rental Math
How to estimate short-term rental profit honestly: revenue from nightly rate and occupancy
📘 Pack_T13A · 5 CHAPTERS
Airbnb Profit Worked Examples: Six Scenarios, Arithmetic Shown
Six short-term rental scenarios worked step by step: a full monthly profit calculation, oc
📘 Pack_T13A · 5 CHAPTERS
Airbnb Profit Mistakes and FAQ: Where Rental Estimates Go Wrong
Common short-term rental estimate mistakes — peak-season projections, forgotten recurring
📘 Pack_T13B · 5 CHAPTERS
Mortgage Points in 2026: When Buying Down Your Rate Pays Off
A plain-English 2026 guide to mortgage discount points: what a point costs, how much rate
📘 Pack_T13B · 5 CHAPTERS
Mortgage Points Worked Examples: Six Break-Even Scenarios, Step by Step
Six worked mortgage-points scenarios with the arithmetic shown: point cost, monthly saving
📘 Pack_T13B · 5 CHAPTERS
Mortgage Points Mistakes, Pro Tips, and FAQ: What Borrowers Get Wrong
The most common mortgage points mistakes — framing errors, fee confusion, tax assumptions
📘 Pack_T13B · 5 CHAPTERS
TSP Retirement Calculator Guide 2026: Limits, Match, and Projections
A 2026 guide to modeling your Thrift Savings Plan: 2025 contribution limits and how limits
📘 Pack_T13B · 5 CHAPTERS
TSP Worked Examples: Six Contribution and Growth Scenarios, Step by Step
Six TSP scenarios with the arithmetic shown: capturing the full match, high savings rates,
📘 Pack_T13B · 5 CHAPTERS
TSP Mistakes, Pro Tips, and FAQ: Where Federal Savers Leave Money Behind
The costliest TSP mistakes — underused match, forgotten catch-ups, Roth confusion, early w
📘 Pack_T13B · 5 CHAPTERS
FERS Retirement Calculator Guide 2026: High-3, Multipliers, and MRA
A 2026 guide to the FERS basic annuity: the 1% and 1.1% multipliers, how high-3 salary wor
📘 Pack_T13B · 5 CHAPTERS
FERS Annuity Worked Examples: Six Calculations, Step by Step
Six FERS annuity scenarios computed step by step: the career thirty, the 1.1% switch at 62
📘 Pack_T13B · 5 CHAPTERS
FERS Retirement Mistakes, Pro Tips, and FAQ: Expensive Errors and Easy Fixes
The costliest FERS planning mistakes — final-salary estimates, missed 1.1% windows, supple
📘 Pack_T13B · 5 CHAPTERS
Towing Capacity Guide 2026: GVWR, Payload, GCWR, and Tongue Weight
A plain-language guide to towing limits: what curb weight, GVWR, payload, GCWR, and tongue
📘 Pack_T13B · 5 CHAPTERS
Towing Capacity Worked Examples: Six Real-World Weight Checks
Six towing scenarios computed step by step: payload checks, fifth-wheel pin weight, GCWR l
📘 Pack_T13B · 5 CHAPTERS
Towing Mistakes, Pro Tips, and FAQ: Where Weight Checks Go Wrong
The most common towing mistakes — trusting the tow rating, ignoring passengers, guessing t
📘 Pack_T13B · 5 CHAPTERS
EV Charging Cost Guide 2026: Rates, Efficiency, and Cost per Mile
A 2026 guide to what charging an EV really costs: residential rates from about $0.10 to $0
📘 Pack_T13B · 5 CHAPTERS
EV Charging Cost Worked Examples: Six Scenarios from Home to Highway
Six EV charging cost scenarios computed step by step: the monthly commuter bill, one 20-to
📘 Pack_T13B · 5 CHAPTERS
EV Charging Mistakes, Pro Tips, and FAQ: Where the Math Goes Wrong
Common EV charging cost mistakes — ignored losses, flat-rate assumptions, sticker battery
📘 Pack_T14A · 5 CHAPTERS
Conduit Fill: The 2026 Guide to NEC Fill Rules and Conductor Counts
How NEC conduit fill works: the 53, 31, 40, and 60 percent rules, Chapter 9 Tables 4 and 5
📘 Pack_T14A · 5 CHAPTERS
Conduit Fill Worked Examples: Six Runs Worked From Table Values
Six worked conduit fill scenarios with full arithmetic — half-inch EMT, three-quarter-inch
📘 Pack_T14A · 5 CHAPTERS
Conduit Fill Mistakes: Six Failure Modes, Pro Tips, and FAQ
The six conduit fill mistakes inspectors see most — forgotten grounds, wire-count thinking
📘 Pack_T14A · 5 CHAPTERS
Sod Math: The 2026 Guide to Measuring, Pallets, and Ordering
How to measure a lawn for sod, the roughly 500 square foot pallet norm, slab and roll coun
📘 Pack_T14A · 5 CHAPTERS
Sod Calculator Worked Examples: Six Yards From Tape Measure to Pallets
Six worked sod estimates with full arithmetic — rectangles, circles, L-shaped yards, slabs
📘 Pack_T14A · 5 CHAPTERS
Sod Ordering Mistakes: Seven Errors, Pro Tips, and FAQ
The seven sod ordering mistakes that waste money and grass — wrong pallet sizes, skipped w
📘 Pack_T14A · 5 CHAPTERS
Grout Math: The 2026 Guide to Coverage, Bags, and the Formula Factors
How a grout calculator works: the coverage formula and its factors — tile size, joint widt
📘 Pack_T14A · 5 CHAPTERS
Grout Calculator Worked Examples: Six Jobs From Tile Size to Bag Count
Six worked grout estimates with full arithmetic — subway backsplash, plank floors, mosaics
📘 Pack_T14A · 5 CHAPTERS
Grout Estimating Mistakes: Six Errors, Pro Tips, and FAQ
The six grout estimating mistakes tilers see most — guessed depths, cement math on epoxy j
📘 Pack_T14A · 5 CHAPTERS
Topsoil Math: The 2026 Guide to Cubic Yards, Depths, and Ordering
How to calculate topsoil: the square-feet-times-inches-over-324 formula, depth choices by
📘 Pack_T14A · 5 CHAPTERS
Topsoil Calculator Worked Examples: Six Projects From Inches to Yards
Six worked topsoil estimates with full arithmetic — lawn topdressing, raised beds, circula
📘 Pack_T14A · 5 CHAPTERS
Topsoil Ordering Mistakes: Six Errors, Pro Tips, and FAQ
The six topsoil ordering mistakes yards see most — square yards versus cubic yards, guesse
📘 Pack_T14A · 5 CHAPTERS
Wire Size: The 2026 Guide to Ampacity, Voltage Drop, and Choosing Gauge
How wire size is chosen: copper ampacity from the 75°C column, the 240.4(D) small-conducto
📘 Pack_T14A · 5 CHAPTERS
Wire Size Worked Examples: Six Circuits From Load to Gauge
Six worked wire-sizing scenarios with full arithmetic — branch circuits, a water heater, a
📘 Pack_T14A · 5 CHAPTERS
Wire Sizing Mistakes: Six Errors, Pro Tips, and FAQ
The six wire-sizing mistakes that cause dim lights, warm cords, and failed inspections — b
📘 Pack_T14B · 5 CHAPTERS
Lawn Fertilizer Math: The 2026 Guide to Bag Ratios, Target Rates, and How Much to Apply
How fertilizer math works: reading N-P-K on the bag, the half-pound to one-pound nitrogen
📘 Pack_T14B · 5 CHAPTERS
Fertilizer Math Worked: Six Lawn Scenarios From Bag Count to Spreader
Six worked fertilizer examples with the arithmetic shown: 10-10-10 on a small lawn, 29-0-5
📘 Pack_T14B · 5 CHAPTERS
Fertilizer Mistakes That Waste Product and Burn Lawns — and the Habits That Fix Them
The most common fertilizer mistakes: confusing percent with pounds, guessing lawn size, ig
📘 Pack_T14B · 5 CHAPTERS
HVAC Load Sizing: The 2026 Guide to BTU Estimates, Zone Factors, and Right-Sizing Your System
How HVAC load sizing works: simplified BTU-per-square-foot estimates by climate, the facto
📘 Pack_T14B · 5 CHAPTERS
HVAC Sizing Worked: Six Load Calculations From Square Footage to Equipment Choice
Six worked HVAC load examples with the arithmetic shown: mild and hot climates, apartments
📘 Pack_T14B · 5 CHAPTERS
HVAC Sizing Mistakes That Cost Thousands — and How to Estimate Like a Pro
The costliest HVAC sizing mistakes: oversizing from fear, trusting old nameplates, ignorin
📘 Pack_T14B · 5 CHAPTERS
Gravel Driveway Math: The 2026 Guide to Cubic Yards, Tonnage, and Ordering the Right Amount
How gravel driveway math works: converting depth to cubic yards, the roughly 1.4 tons per
📘 Pack_T14B · 5 CHAPTERS
Gravel Driveway Worked Examples: Six Orders From Tape Measure to Scale Ticket
Six worked gravel calculations with the arithmetic shown: a standard driveway, a new build
📘 Pack_T14B · 5 CHAPTERS
Gravel Driveway Mistakes That Cost Real Money — and the Habits That Prevent Them
Common gravel driveway mistakes: unit mix-ups, skipping compaction allowance, thin patchin
📘 Pack_T14B · 5 CHAPTERS
Rental Property Returns: The 2026 Guide to NOI, Cap Rate, Cash-on-Cash, and the 1% Rule
How rental property ROI works: building net operating income, cap rate versus cash-on-cash
📘 Pack_T14B · 5 CHAPTERS
Rental Property Numbers Worked: Six Deals From Rent Roll to Cash-on-Cash
Six worked rental property analyses with full arithmetic: a financed single-family buy, a
📘 Pack_T14B · 5 CHAPTERS
Rental Property Analysis Mistakes That Turn Deals Into Albatrosses — and the Pro Fixes
The costliest rental analysis mistakes: gross-rent optimism, zero vacancy lines, skipped c
📘 Pack_T14B · 5 CHAPTERS
Extra Payments and Loan Payoff: The 2026 Guide to Amortization, Interest Savings, and Faster Freedom
How loan payoff math works: amortization schedules, why early payments are mostly interest
📘 Pack_T14B · 5 CHAPTERS
Loan Payoff Worked: Six Extra-Payment Scenarios With the Interest Math Shown
Six worked extra-payment examples with full arithmetic: $100 and $200 monthly extras, biwe
📘 Pack_T14B · 5 CHAPTERS
Extra-Payment Mistakes That Waste Your Money — and the Payoff Habits That Work
Common extra-payment mistakes: extras posted as advances, ignoring higher-rate debt, thin
📘 Pack_T15A · 5 CHAPTERS
eGFR and the GFR Calculator: The 2026 Guide to Reading Your Kidney Numbers
A plain-English 2026 guide to eGFR: the CKD-EPI 2021 race-free equation, the G1 to G5 stag
📘 Pack_T15A · 5 CHAPTERS
GFR Worked Examples: Six eGFR Calculations Shown Step by Step
Six fully worked CKD-EPI 2021 examples — real ages, creatinines, and every factor shown —
📘 Pack_T15A · 5 CHAPTERS
GFR Mistakes and Fixes: The Reader's Guide to Using eGFR Wisely
Six common eGFR mistakes — from panic at 59 to unit errors and test-day games — plus pro t
📘 Pack_T15A · 5 CHAPTERS
Ideal Body Weight in 2026: The Devine Formula, BMI Bands, and What 'Ideal' Actually Means
A clear 2026 guide to ideal body weight: the Devine formula step by step, how BMI bands re
📘 Pack_T15A · 5 CHAPTERS
Ideal Body Weight Worked Examples: Six Devine Formula Calculations, Shown in Full
Six fully worked ideal body weight examples — men, women, below-five-feet, BMI cross-check
📘 Pack_T15A · 5 CHAPTERS
Ideal Body Weight: Six Mistakes, the Pro Tips That Fix Them, and an Honest FAQ
The most common ideal body weight mistakes — dieting to a dosing number, unit mix-ups, for
📘 Pack_T15A · 5 CHAPTERS
Body Surface Area (BSA): The 2026 Guide to Du Bois, Mosteller, and Why Medicine Uses It
A clear 2026 guide to body surface area: the Du Bois and Mosteller formulas, where BSA is
📘 Pack_T15A · 5 CHAPTERS
BSA Worked Examples: Six Body Surface Area Calculations, Shown Step by Step
Six fully worked body surface area examples — Mosteller and Du Bois side by side, a child
📘 Pack_T15A · 5 CHAPTERS
BSA Mistakes and Fixes: The Six Errors That Break Body Surface Area Calculations
The six most common BSA mistakes — pounds in centimeter fields, formula mismatches, roundi
📘 Pack_T15A · 5 CHAPTERS
Hourly to Salary: The 2026 Guide to Annualizing a Wage Without Fooling Yourself
A clear 2026 guide to converting hourly pay to annual salary: the 2,080-hour baseline, the
📘 Pack_T15A · 5 CHAPTERS
Hourly to Salary Worked Examples: Six Annual-Pay Calculations, Shown Step by Step
Six fully worked hourly-to-salary conversions — baseline math, the $7.25 federal minimum,
📘 Pack_T15A · 5 CHAPTERS
Hourly to Salary Mistakes: The Six Errors That Distort Annual Pay — and the Fixes
The six most common hourly-to-salary mistakes — 52-week defaults, overtime blindness, gros
📘 Pack_T15A · 5 CHAPTERS
What Travel Insurance Should Cost: The 2026 Guide to the 4–10% Rule and What Moves It
A practical 2026 guide to travel insurance costs: the rough 4–10% of trip cost ballpark, w
📘 Pack_T15A · 5 CHAPTERS
Travel Insurance Cost Worked Examples: Six Pricing Scenarios, Shown Step by Step
Six fully worked travel insurance cost examples — the 4–10% band applied to real trip budg
📘 Pack_T15A · 5 CHAPTERS
Travel Insurance Cost Mistakes: Six Expensive Errors, Pro Tips, and Honest Answers
The six most common travel insurance cost mistakes — insuring refundable money, buying too
📘 Pack_T15B · 5 CHAPTERS
Escrow Accounts Explained: The 2026 Guide to Your Mortgage's Quiet Third Line
How mortgage escrow works in 2026: PITI, the RESPA two-month cushion, shortage and surplus
📘 Pack_T15B · 5 CHAPTERS
Six Escrow Worked Examples: Shortages, Surpluses, and the Cushion Math
Six step-by-step escrow calculations: monthly deposits, the two-month cushion, reassessmen
📘 Pack_T15B · 5 CHAPTERS
Escrow Mistakes That Cost Homeowners Money — and the FAQ That Fixes Them
Common escrow account mistakes, pro tips for reading your annual analysis, and honest answ
📘 Pack_T15B · 5 CHAPTERS
PTO Payout in 2026: How the Math Works, How It's Taxed, and Where State Rules Change Everything
A complete guide to paid time off payouts: the rate-times-hours math, supplemental withhol
📘 Pack_T15B · 5 CHAPTERS
Six PTO Payout Worked Examples: Rates, Withholding, and State Differences
Step-by-step PTO payout math: salaried conversions, supplemental withholding, hourly payou
📘 Pack_T15B · 5 CHAPTERS
PTO Payout Mistakes That Cost Employees Real Money — Plus Pro Tips and FAQ
The most common PTO payout mistakes: assuming entitlement, misreading withholding, bad res
📘 Pack_T15B · 5 CHAPTERS
Margin Loans Explained: The 2026 Guide to Borrowing Against Your Portfolio
How margin loans work in 2026: initial and maintenance margin, daily interest on the debit
📘 Pack_T15B · 5 CHAPTERS
Six Margin Loan Worked Examples: Triggers, Calls, and the Cost of Leverage
Step-by-step margin math: opening positions, liquidation trigger prices, surviving a call,
📘 Pack_T15B · 5 CHAPTERS
Margin Loan Mistakes That Liquidate Portfolios — Pro Tips and FAQ
The margin borrowing mistakes that force sales at the worst prices, plus pro tips for moni
📘 Pack_T15B · 5 CHAPTERS
Car Insurance Estimates in 2026: What an Estimator Can and Cannot Tell You
How car insurance estimators work: the rating factors that move rates, coverage structure,
📘 Pack_T15B · 5 CHAPTERS
Six Car Insurance Worked Examples: Coverage Trades, Tickets, Bundles, and ZIP Swings
Step-by-step car insurance arithmetic: liability versus full coverage, deductible break-ev
📘 Pack_T15B · 5 CHAPTERS
Car Insurance Mistakes That Cost Drivers Thousands — Pro Tips and FAQ
The most expensive car insurance mistakes: comparing unlike quotes, ignoring structure, au
📘 Pack_T15B · 5 CHAPTERS
Personal Loan Payments Explained: Amortization, Fees, and the APR Effect in 2026
How personal loan payments work: the amortization mechanics, how origination fees change t
📘 Pack_T15B · 5 CHAPTERS
Six Personal Loan Worked Examples: Payments, Fees, Terms, and Prepayment Math
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📘 Pack_T15B · 5 CHAPTERS
Personal Loan Mistakes That Cost Borrowers Thousands — Pro Tips and FAQ
The costliest personal loan mistakes: trusting headline rates, ignoring fees, stretching t