CALCMONEY // GUIDES // PAGE 13 OF 14
Blog.
Numbers-first guides on mortgages, taxes, retirement, and net worth. No opinions, no fluff.
Barista FIRE Calculator: The Math Behind Semi-Retirement
Barista FIRE means working part-time to cover basic expenses while your portfolio covers the rest. With $800,000 invested and $20,000 in part-time income, you can retire 8 years earlier than full FIRE.
Coast FIRE Calculator: How Much to Save Now So You Can Stop Later
Coast FIRE means saving enough now that compound interest carries you to retirement without another dollar contributed. At 30, you need $172,000 invested to coast to $1.5M by 65. Here is the math.
Lean FIRE vs Fat FIRE Calculator: Which Number Is Right for You?
Lean FIRE needs $750,000. Fat FIRE needs $3 million. The gap is not about greed, it is about what retirement actually looks like day to day. Here is how to calculate your version.
FIRE Number Calculator: Exactly How Much You Need to Retire Early
Your FIRE number is 25 times your annual expenses. On $60,000 per year spending, that is $1.5 million. But the 4% rule has conditions most FIRE calculators ignore. Here is the complete calculation.
Mortgage Calculator by State: Why the Same Home Costs $600 More in New Jersey
The same $350,000 home with the same mortgage rate costs $543 more per month in New Jersey than in Alabama. State property taxes make the biggest difference. Here is the breakdown by state.
Mortgage Refinance Break-Even Calculator: Is Refinancing Worth It?
Refinancing costs $3,000 to $6,000 in closing costs. If your monthly savings are $180, your break-even is 22 months. Here is how to calculate whether a refi actually saves money.
First Time Home Buyer Mortgage Calculator: What You Can Actually Afford
Lenders approve you for the maximum they will give. That number is not what you can comfortably afford. Here is how to calculate your real budget before you talk to a lender.
30-Year vs 15-Year Mortgage Calculator: Which Saves More Money?
The 15-year mortgage saves $147,000 in interest on a $300,000 loan. But the higher payment might cost you more in opportunity cost. Here is how to calculate which one actually wins.
Mortgage Calculator with PMI: The Real Cost of Less Than 20% Down
Put 10% down on a $400,000 home and you owe an extra $233 per month in mortgage insurance. Here is how PMI works, how much it costs, and exactly when it disappears.
PITI Mortgage Calculator: What Your Actual Monthly Payment Looks Like in 2026
The interest rate your lender quotes is not your monthly payment. Add property taxes, insurance, and PMI and the number changes by hundreds. Here is the full PITI breakdown.
Military Retirement Pay Calculator: BRS vs Legacy, What You'll Actually Receive
Military retirement pay depends on which system you're under. Legacy High-3 vs Blended Retirement System (BRS) produce different numbers. Here's the real math.
FICA Tax Calculator: What You Pay for Social Security and Medicare in 2026
FICA taxes take 7.65% from employees and 15.3% from the self-employed. Here's the 2026 wage base, Medicare surcharge thresholds, and the net investment income tax.
How Much to Save for a House: A Month-by-Month Calculator
Saving for a home on a $400K purchase requires $80K down plus closing costs plus reserves. Here's a savings timeline for every down payment target and home price.
First-Year Home Ownership Calculator: The Costs Nobody Warns You About
Buying a home costs more in year one than just the mortgage. Closing costs, moving, repairs, and furnishings can add $20,000-$40,000 before you make your second payment.
Debt-to-Income Ratio: The Number That Controls Your Mortgage Approval
Your DTI ratio is the single most important number in your mortgage application. Banks use it to decide how much house you can afford. Here is how to calculate it and what to do if yours is too high.
Cost of Living Comparison: How to Calculate Whether a New City Actually Pays More
A $120,000 salary in Austin is not the same as $120,000 in San Francisco. Before you accept that out-of-state offer, here is how to calculate the real purchasing power difference.
Yield to Maturity Calculator: What Your Bond Is Actually Paying You
Coupon rate and yield to maturity are different numbers. Here's what YTM means, how to calculate it, and why it's the only metric that matters when comparing bonds.
Daily Compound Interest: The Formula Banks Use That You Should Too
Most people understand annual compound interest. But banks compound daily, and that difference matters more than you think. Here is the exact formula and how to use it.
Car Payment Calculator: The Full Math Behind Your Monthly Auto Payment
Dealers love to talk monthly payments instead of total cost. That is how a $30,000 car turns into $42,000. Here is how to calculate your real car payment and total interest before you set foot on a lot.
Jumbo Loan Calculator: What You Need to Qualify for a $1M+ Mortgage
The 2026 conforming loan limit is $766,550. Above that, you're in jumbo territory. Here's what lenders require and what a $1M mortgage actually costs monthly.
Emergency Fund Calculator: How Much Cash You Actually Need Set Aside
The standard advice says 3 to 6 months of expenses. But that range is absurdly wide. Here is how to calculate your specific number based on your actual risk profile.
Down Payment Assistance: How Much Help Can You Actually Get?
Down payment assistance programs offer $10,000 to $100,000+ in grants and forgivable loans. Here's what's available, who qualifies, and how it changes your monthly payment.
Marginal vs. Effective Tax Rate: Why Most People Overpay By Misunderstanding Their Bracket
Getting a raise that pushes you into the next tax bracket does not mean all your income gets taxed at the higher rate. Here is how marginal tax rates actually work and why the confusion costs people money.
Rental Property ROI: How to Calculate Whether an Investment Property Is Worth Buying
Cap rate, cash-on-cash return, and total ROI all measure different things. Most new landlords only look at one and get burned. Here is how to calculate all three and what they actually tell you.
Savings Rate Calculator: The Single Metric That Predicts When You Can Retire
Your savings rate is not just a budgeting metric. It directly determines how many years until you reach financial independence. At 10%, you work for 51 years. At 50%, you work for 17. Here is the math.
Wedding Cost Calculator: The Real Price of Getting Married in 2026
The average US wedding costs $33,000. Costs scale sharply with guest count. Here's a full budget breakdown by wedding size and a savings timeline for $30K.
Dividend Income Calculator: How Much You Need Invested to Live Off Dividends
Living off dividend income sounds like the ultimate retirement play. But the portfolio size required surprises most people. Here is the exact math for every income target.
Down Payment Calculator: How Much You Really Need to Buy a House in 2026
20% down is the gold standard. But most first-time buyers put down far less. Here is what each down payment level costs you in PMI, interest, and total loan expense over 30 years.
Catch-Up Contributions Calculator: How Much Extra Can You Save After 50?
At 50+, you can contribute an extra $7,500 to your 401k and $1,000 to your IRA. SECURE 2.0 adds a super catch-up for ages 60-63. The numbers show why this matters.
Estimated Quarterly Tax Calculator: When to Pay and How Much
Self-employed, freelancers, and investors with capital gains need to pay quarterly estimated taxes. Here's the 2026 due dates, safe harbor rules, and a real example.
Payroll Calculator: The True Cost of an Employee vs a $75,000 Salary
A $75,000 salary actually costs an employer $95,000 to $105,000 per year. Here's the full breakdown of employer payroll taxes and benefits costs.
Portfolio Allocation Calculator: The Right Asset Mix at Every Age
The old '110 minus age' rule is outdated. Here's the updated framework for stock/bond allocation at every decade of life, with real numbers.
BMI Calculator: How Your BMI Affects Life Insurance Premiums and Rates
BMI is the world's most widely used health screening metric. And also one of the most misunderstood. Here's how to calculate your BMI, understand what the number actually tells you, and what to do with the result.
Business Valuation Calculator: How to Calculate What Your Business Is Worth
Every business owner knows their revenue. Fewer know their company's true market value. Whether you're planning to sell, raise capital, or bring in partners, understanding business valuation math is non-negotiable.
Capital Gains Tax Calculator: How to Calculate What You Owe on Every Investment Sale
Selling an investment for a profit feels great. Until the IRS takes their cut. Understanding capital gains tax before you sell can save you thousands. Here's the complete breakdown.
Discount Calculator: How to Calculate Sale Prices and Real Savings Instantly
A 30% off sign doesn't mean you understand how much you're actually saving. Or paying. Here's how to calculate discounts, verify sale prices, and avoid retailer math tricks.
HELOC Calculator: How to Calculate Your Home Equity Line of Credit
Your home equity may be your largest untapped financial asset. A HELOC lets you borrow against it. But the math behind available credit, interest rates, and LTV limits is critical to get right.
How to Calculate Mortgage Refinance Savings: Break-Even Math Made Simple
Lenders will always tell you that refinancing saves you money. But the real question isn't about the rate. It's about the break-even point. Here's the math you need.
Percentage Calculator: 3 Types of Percentage Problems (All Solved Instantly)
Percentages appear everywhere. Salary increases, test scores, investment returns, discounts, and statistics. Master these three core percentage formulas and you'll never reach for a calculator again in the same way.
Roth Conversion: The Tax Strategy Most People Discover Too Late
Converting your traditional IRA to a Roth IRA sounds simple. But get the timing wrong and the IRS will take a painful bite. Here's the math behind a winning conversion strategy.
Salary to Hourly Calculator: What Your Annual Salary Actually Pays Per Hour
Before accepting a salary offer. Or comparing a salaried role to a freelance contract. You need to know the true hourly rate. The math is simple. The implications are significant.
Sales Tax Calculator: How to Calculate Sales Tax on Any Purchase
Sales tax varies by state, county, and city. And it adds up fast. Whether you're budgeting for a major purchase or running a business, knowing how to calculate sales tax accurately saves you money and keeps you compliant.
Self-Employment Tax: What Every Freelancer Gets Wrong
Freelancers and business owners don't just pay income tax. They pay self-employment tax on top of it. Most people dramatically underestimate their actual bill. Here's the real math.
Social Security Calculator: How to Calculate Your Benefit and the Best Age to Claim
The age you claim Social Security determines your monthly benefit for the rest of your life. Claiming too early could cost you hundreds of thousands over a 30-year retirement. Here's how to calculate the optimal strategy.
Startup Runway Calculator: How to Calculate Your Burn Rate and Cash Runway
Running out of cash is the #1 cause of startup death. And it almost always comes faster than founders expected. Here's how to calculate your runway, burn rate, and break-even month with precision.
Tip Calculator: How to Calculate Tips and Split Bills Like a Math Pro
Tipping doesn't have to be awkward mental math. Whether you're at a restaurant, calculating a service tip, or splitting a bill with 9 people, here's how to nail the math every time.
Standard Deduction vs Itemizing in 2026: Which Saves You More Money?
The 2026 standard deduction is $15,000 for singles and $30,000 for married couples. Here's how to figure out whether itemizing beats it. With real examples.
The 4% Rule Explained: Is It Safe for Retirement?
The number one fear of retirees is outliving their money. How do you know how much you can spend from your portfolio without going broke at age 85? Enter the 4% Rule.