CALCMONEY // GUIDES // PAGE 2 OF 25
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Numbers-first guides on mortgages, taxes, retirement, and net worth. No opinions, no fluff.
Build a Compound Interest Calculator in Excel: Formula + Template for Monthly Contributions
Most Excel compound interest formulas ignore monthly contributions. That omission can misstate your projected balance by six figures over 20 years. Here is the correct setup, with worked numbers.
Compound Interest Adjusted for Inflation: What Your Real Returns Actually Are
Your savings account says you earned 5%. Inflation says you didn't. The gap between your nominal return and your real return is where wealth quietly disappears. Most calculators never show you this number.
Compound Interest Calculator With Withdrawals: How Monthly Distributions Slash Your Final Balance
Most investors model compound growth correctly, then ruin the projection by ignoring withdrawals. A $500 monthly distribution from a $250,000 portfolio earning 7% costs you more than $340,000 over 30 years. That gap is not a rounding error. It is a retirement plan.
How to Calculate Discount Rate for NPV and Choose the Right One for Your Investment
Most investors pick a discount rate by feel. That single error can make a losing investment look profitable by six figures. Here is the exact method professionals use, with the math shown in full.
DCF Discount Formula: How to Calculate Intrinsic Value Like an Institutional Investor
Most retail investors price stocks by what the market charges, not what the business is worth. That gap costs them. DCF analysis closes it, and the math is not as intimidating as Wall Street firms prefer you think.
Discount Factor Calculator: How to Value Future Cash Flows Like a Private Equity Firm
Most investors price future cash flows by feel. Private equity firms use a discount factor, and that single calculation changes every decision they make. If you're not discounting, you're guessing.
Debt Consolidation vs. Credit Card Payoff: Calculate Which Strategy Saves You More Interest
Most people choose between debt consolidation and aggressive payoff based on gut feel, not math. That instinct costs thousands. The right answer depends on three specific numbers in your current debt profile.
Credit Card Payoff Calculator With Extra Payments: How Much Faster Can You Exit Debt
Minimum payments on a $8,500 balance at 22% APR will cost you $6,847 in interest and take 13.2 years to clear. Adding $150 per month cuts that to 3.1 years and $1,891 in interest. The difference is not willpower. It is arithmetic.
How to Calculate Your ChubbyFIRE Number (And Why Most People Underestimate It)
Most FIRE calculators assume a spartan retirement. ChubbyFIRE targets a different income tier entirely, and the math compounds the error fast. If you're planning on $2.5M and expecting comfort, read this first.
Your CoastFIRE Number Is Probably Smaller Than You Think. Here's How to Calculate It.
Most people keep maxing out retirement accounts years after they've already won. CoastFIRE lets you stop saving aggressively the moment your existing portfolio can grow to your retirement goal on its own. Running the math takes about five minutes.
CD Calculator: Best Certificate of Deposit Rates in 2026 and What You'll Earn
Marcus is paying 5.10% on 12-month CDs. Here's exactly what you'll earn at different deposit amounts, how CDs compare to HYSAs, and when each makes sense.
Child Tax Credit Calculator 2026: How Much You Get and Who Qualifies
The child tax credit is $2,000 per qualifying child under 17, with up to $1,600 refundable. Here's who qualifies, when it phases out, and a real example for a family earning $120,000.
Closing Costs Calculator: What You'll Actually Pay at the Table
Closing costs run 2-5% of the purchase price on top of your down payment. Here's every line item explained, with real numbers on a $400,000 home purchase.
Crypto Tax Calculator: What You'll Actually Owe on Bitcoin and Other Gains
Bought $5,000 of Bitcoin, sold for $18,000. What do you owe? It depends on your income and how long you held. Here's the complete crypto tax guide.
Charitable Deduction Calculator: How Much Your Donations Actually Save You
Charitable deductions only help if you itemize. At a 32% marginal rate, a $1,000 donation costs you $680. Here's when bunching and donor advised funds make sense.
College Cost Calculator: What Will Your Child's Degree Actually Cost?
A 4-year public university today costs $112,000 for in-state students. With 5% college inflation, a child born today faces a $290,000 bill. Here is how to calculate your target and how much to save monthly to get there.
Cost of Living Comparison Calculator: Is It Worth Moving?
Earning $120,000 in San Francisco is equivalent to $72,000 in Austin after adjusting for housing, taxes, and cost differences. A $50,000 raise that moves you to NYC may leave you financially worse off.
CD Ladder Calculator: How to Build a CD Ladder That Pays More
A 5-year CD ladder with $50,000 earns more than putting everything in a 1-year CD while giving you access to $10,000 every 12 months. Here is the exact math and how to set one up.
Charitable Giving Calculator 2026: DAF Strategy, Appreciated Stock, and QCD Savings
Donating $10,000 of appreciated stock instead of cash saves you $1,500 in capital gains tax while the charity receives the same amount. A donor-advised fund lets you bunch 3 years of giving into one deduction. Here is how to run the numbers.
Compound Interest Calculator: How Exponential Growth Works
$10,000 invested at 7% for 40 years becomes $149,745. For 50 years it becomes $294,570. The extra 10 years nearly doubles the outcome. Here is how compound interest actually works and how to use it.
Disability Insurance Calculator: How Much Income Protection Do You Need?
A 35-year-old has a 25% chance of being disabled for 90+ days before retirement. Employer group disability typically pays 60% of income. On a $100,000 salary, that is a $40,000/year shortfall. Here is how to close the gap.
Credit Card Rewards Calculator: Maximize $1,237+ Annually
Calculate your exact annual rewards in 60 seconds. On $48,000 in spending, a 2% cash back card returns $960. An optimized 2-card setup returns $1,237. A premium travel card beats both only if you actually use the benefits.
Debt-to-Income Ratio Calculator: The Number Lenders Check Before You Do
Lenders want your DTI below 43% for most loans and below 28% for housing alone. On $6,000 monthly income, that is $1,680 for housing and $2,580 total. Here is how to calculate yours and what it costs you.
Dividend Investing Calculator: Building Passive Income From Your Portfolio
A $500,000 portfolio at a 3.5% dividend yield generates $17,500 per year in passive income. Reinvest those dividends for 20 years and the portfolio reaches $1.9 million. Here is how dividend income compounds.
Credit Score Factors Calculator: What Actually Moves Your Score
Payment history is 35% of your FICO score. Credit utilization is 30%. Together they are 65% of the score. One missed payment drops your score 90-110 points. Here is how each factor works and what to change first.
Cost of Having a Baby Calculator: The Real First-Year Number
The first year with a baby costs $15,000 to $25,000 on average after healthcare, childcare, gear, and lost income. Most parents underestimate by $8,000. Here is the full breakdown.
Debt Payoff Calculator: How Extra Payments Slash Your Timeline
An extra $200 per month on a $20,000 credit card at 21% cuts the payoff from 10 years to 4 years and saves $9,600 in interest. Here is exactly how extra payments work and where to find the money.
Debt Snowball vs Avalanche Calculator: Which Saves More Money?
The debt avalanche saves $1,300 more in interest than the snowball on typical debt. But the snowball wins for most people because it is the only one they actually finish. Here is how to calculate both.
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 $140,500 invested to coast to $1.5M by 65. 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.
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.
Snowball vs. Avalanche: Which Debt Payoff Strategy is Best in 2026?
If you have multiple debts, ignorance is costing you money. Randomly paying extra on different loans is the most inefficient way to get free. You need a strategy: Snowball or Avalanche.
How Your Credit Score Affects HELOC Rates: Calculate Your Real APR
Most homeowners apply for a HELOC without knowing their credit score determines the rate tier they land in. A 40-point difference in FICO score can cost $6,000 or more over a five-year draw period. Run your real APR before you sign anything.
HELOC Appraisal Strategy: When Skipping the Full Appraisal Costs You More Than It Saves
Most borrowers choose the no-appraisal HELOC because it closes faster. That speed costs them real money in the form of higher rates and lower credit limits. The math on when to wait for a full appraisal is straightforward, and most lenders won't show it to you.
HELOC Payment Calculator: Wells Fargo vs Rocket vs Regional Banks, Which Structure Costs Less
Most borrowers compare HELOC rates without comparing structures, and that single oversight routinely adds thousands in interest. The draw period, floor rate, and margin spread vary enough between Wells Fargo, Rocket, and regional lenders to change your total cost by $8,000 or more on a $100,000 line. Run your real numbers before you sign anything.
How to Calculate Your True HELOC Payment: Prime Minus Structure vs. Fixed Rate
Most borrowers quote their HELOC rate without knowing whether it sits above or below the Wall Street Journal Prime Rate. That single misreading can cost thousands in interest over a draw period. Here is how to calculate the actual number before you sign.
How to Calculate 1031 Exchange Boot and Tax Owed
Most real estate investors complete a 1031 exchange and only discover their boot liability after the deal closes. Boot triggers immediate capital gains tax on dollars you thought were deferred. Calculate it before you sign, not after.
HELOC vs Home Equity Loan: Which Product Actually Costs Less for HNW Borrowers
Most high-net-worth borrowers default to a home equity loan for predictability. That instinct costs them thousands in unnecessary interest. The cheaper product depends on one number most borrowers never calculate.
HELOC vs. HELOAN: How to Calculate Total Cost Including Closing Fees and APR
Most homeowners compare HELOC and HELOAN rates without accounting for closing costs, draw period interest, and APR differences. That omission routinely costs borrowers thousands. Here is how to run the complete comparison before you sign.
HELOC vs Home Equity Loan for Investment Property: Calculate Which Costs Less
Most investors pick between a HELOC and a home equity loan based on rate headlines, not total cost. That choice routinely adds $8,000 to $22,000 in unnecessary interest over a five-year hold. The right answer depends on how you deploy the capital, and the math differs significantly.
0% Financing Is Not Free. Here's the Math That Proves It.
Retailers call it 0% financing. The math calls it something else. Missing one payment or ignoring the opportunity cost can cost you hundreds of dollars on a deal you thought was free.
FIFO vs HIFO Crypto Tax: Which Method Saves You More Money
Most crypto investors default to FIFO without running the numbers. That default can cost thousands in unnecessary capital gains taxes. The accounting method you choose is one of the most controllable variables in your crypto tax bill.
Federal Income Tax Calculator 2026: What You'll Owe (And How to Reduce It)
The 2026 federal tax brackets, a real example of what a married couple with $95,000 AGI actually owes, and the fastest legal ways to lower your bill.
FHA Loan Calculator: Monthly Payment, MIP, and Total Cost vs Conventional
FHA loans let you buy with 3.5% down and a 580 credit score. But mortgage insurance adds real cost. Here's the full comparison against conventional on a $350,000 home.
Home Equity Calculator: How Much Equity Do You Actually Have?
Home equity is the difference between what your home is worth and what you owe. Here's how to calculate it, estimate your current value, and determine how much you can borrow.
ESPP Calculator: How Employee Stock Purchase Plans Work and What They Actually Pay
A 15% discount ESPP on a stock that does not move still returns 17.6% in 6 months. Sell immediately on purchase date and you have near-guaranteed return. Here is the full ESPP math and tax treatment.