Skip to main content

Finance

Loans, mortgages, savings growth, and long-term planning — with transparent formulas.

Whether you're comparing mortgage scenarios, stress-testing an early retirement plan, or just need a fast tip split — our finance calculators turn spreadsheet logic into clear inputs and outputs. Each tool shows the core relationship (payment, rate, time, or return) so you understand the number, not only the bottom line. Personal finance is personal; use these results alongside your own goals and, when needed, a qualified professional.

Borrowing

Loans & payments

Principal, interest rate, and term combine into a monthly payment. See how extra payments shorten the payoff path.

Growth

Compound interest

Returns earn returns when they stay invested. Small rate and time differences compound into large outcome gaps.

Planning

Retirement & FIRE

Translate spending and savings rates into portfolio targets—often discussed using withdrawal-rate rules of thumb.

Snapshot

Net worth & ROI

Assets minus liabilities for a balance-sheet view; ROI compares gain to what you put in.

Car Affordability

payment ÷ income

Estimate an affordable vehicle payment from income and typical lender caps—pair with interest and term assumptions.

College Savings (529)

FV of contributions

Project a 529 or education fund balance from ongoing contributions, expected return, and years until school.

Compound Interest

A = P(1 + r/n)^(nt)

Future value with compounding—adjust principal, APR, compounding frequency, and time to compare scenarios.

Extra Mortgage Payment

extra → principal

See how additional monthly principal cuts total interest and loan term on your amortization schedule.

FIRE Calculator

≈ annual spend × 25

Ballpark “financial independence” targets using spending and the common 4% starting-point rule—then refine with your plan.

Home Affordability

28% / 36% rules

Relate income, debts, down payment, and rate to a sensible purchase price using classic housing-debt ratios.

Hourly to Salary

hourly × hrs × wks

Convert an hourly wage to annual income using hours per week and working weeks per year.

Loan Payment

M = P[r(1+r)^n]/[(1+r)^n−1]

Standard amortizing payment from principal, periodic rate, and number of payments—core logic for most installment loans.

Micro-Retirement Simulator

scenario paths

Run compact retirement projections—contributions, growth, and draw phases—to compare “what if” settings.

Mortgage Payment

PITI-style payment

Estimate monthly housing cost including principal, interest, taxes, and insurance where you enter them.

Net Worth

assets − liabilities

Add what you own, subtract what you owe—get a simple snapshot of household net worth.

ROI Calculator

(gain − cost) ÷ cost

Percentage return on an investment or project from starting value and ending value (or gain).

Retirement Savings

FV of savings

Project retirement balances from contributions, employer match, growth rate, and years to retirement.

Salary to Hourly

salary ÷ (hrs × wks)

Break an annual salary into an equivalent hourly rate for comparison or negotiation context.

Savings Goal

PMT or time to goal

Solve for required monthly savings—or time—to reach a target balance at a given interest rate.

Tip Calculator

bill × (1 + tip%)

Split checks with tip and per-person totals—handy for restaurants and shared bills.

Guides & Articles

View all Finance articles
Planner and calendar mapping a mini retirement logistics timeline
mini retirement

How to Plan a Mini Retirement: The Complete Logistics Guide

Everything you need to actually execute a mini retirement — duration, health insurance, taxes, Social Security, timing by age, and whether to take one long break or several short ones.

May 24, 2026 · 10 min read
Homeowner checking home equity paperwork
calculate home equity

Calculate Home Equity: A Guide for Homeowners

Unlock your financial potential with our comprehensive calculate home equity guide. Learn how to confidently determine your home's equity today!

May 23, 2026 · 14 min read
Person returning home from a mini retirement celebrating with I'm Back
mini retirement

Will a Mini Retirement Hurt Your Career?

The honest answer on career gaps, re-employment odds, how to explain time off to employers, and whether to tell your current company.

May 22, 2026 · 9 min read
Spreadsheet and budget notes for mini retirement savings planning
mini retirement

How Much Money Do You Actually Need for a Mini Retirement?

The real math behind funding a mini retirement — runway calculations, the $1,000/month rule, budgeting by location, and whether you can do it on a low salary or with debt.

May 21, 2026 · 11 min read
Person on a balcony during an intentional career break from work
mini retirement

What Is a Mini Retirement? And Is It the Same as a Sabbatical?

The complete guide to mini retirements — what they are, how they differ from sabbaticals, real examples, and how they connect to Coast FIRE.

May 20, 2026 · 14 min read
Woman calculating interest at a home desk
interest formulas

The Role of Interest Formulas in Personal Finance

Discover the critical role of interest formulas in personal finance. Transform how you save and invest with expert insights today!

May 18, 2026 · 13 min read
Homeowner reviewing a mortgage statement at the kitchen table
mortgage statement

Understanding Mortgage Statements: a Homeowner's Guide

Unlock the secrets of your mortgage with our guide to understanding mortgage statements. Stay informed, catch errors, and take control!

May 17, 2026 · 14 min read
Homebuyer reviewing mortgage insurance paperwork
mortgage insurance premium

Mortgage insurance premiums: what every homebuyer must know

Discover the role of mortgage insurance premium and how it impacts your homebuying journey. Make informed decisions to secure your mortgage!

May 7, 2026 · 14 min read
Couple calculates mortgage at kitchen table
mortgage payment

How to calculate your mortgage payment the smart way

Learn how to calculate mortgage payments confidently! Our smart guide simplifies the process, so you make informed financing decisions.

May 6, 2026 · 18 min read
Homeowner reviewing online finance calculator
homeowner finance calculators

Best finance calculators for homeowners: Smart choices

Discover the top finance calculators for homeowners to ensure accurate budgeting. Avoid costly mistakes and choose wisely for your financial future!

May 2, 2026 · 14 min read
Hot dog and fountain drink on a warehouse food court counter
Costco

The Costco Hot Dog Combo Just Changed for the First Time in 40 Years. Here's the Full Financial Breakdown of the Greatest Pricing Stand in Retail History.

Costco keeps the $1.50 hot dog combo while adding a bottled-water option. Inflation math, ~$710M implied subsidy at 245M combos/year, membership economics, nutrition facts, and the compound-interest case for the loss leader.

April 29, 2026 · 8 min read
Woman reviewing savings projections at desk
compound interest calculator

Compound interest calculator benefits for your savings

Discover the compound interest calculator benefits for your savings! Visualize your financial future and boost your savings effortlessly.

April 29, 2026 · 11 min read
Man calculating compound interest in kitchen
calculating compound interest

Calculating Compound Interest: A Step-by-Step Beginner's Guide

Learn how to calculate compound interest easily with our step-by-step guide. Boost your savings and maximize your earnings with simple methods!

April 26, 2026 · 12 min read
Man calculates loan payment at home desk
calculate loan payments

How to calculate loan payments: a step-by-step guide

Learn how to calculate loan payments confidently with our step-by-step guide. Avoid financial pitfalls and make informed borrowing decisions today!

April 25, 2026 · 13 min read
Abstract finance and settlement theme for Capital One 360 Savings class action
Capital One

The Capital One $425 Million Settlement Just Got Final Approval. Here's Exactly How Much You'll Get.

Final court approval April 20, 2026: who qualifies for the Capital One 360 Savings class action, how payouts are calculated from the $425M fund, automatic payments around July 2026, and what to do about your address and taxes.

April 23, 2026 · 6 min read
Stylized football, contract, and state-map tax contrast for NFL draft finances
NFL Draft 2026

The NFL Draft Is This Week. Here's What Pick #1 Actually Takes Home.

The #1 overall rookie contract is worth over $54.5 million guaranteed - but take-home pay is a different story. Here's the full breakdown: agent fees, federal tax, state tax by team, advisor costs, best vs. worst case, jock tax, and compound growth.

April 20, 2026 · 8 min read
Editorial split US and Europe travel graphic with departure board tones, no text
EU261

Your Flight Is Delayed or Cancelled. Here's Exactly What You're Owed.

US and European rules are completely different - and the gap is enormous. Plain-English guide to DOT refunds, EU261 cash compensation, UK261, credit card chargebacks, and how to claim.

April 19, 2026 · 8 min read
Stylized Masters green, gold accents, and abstract prize check motif for a golf finance article
Rory McIlroy

Rory McIlroy Won $4.5 Million at The Masters. Here's What He Actually Keeps.

The headline number is what goes on the trophy. The real number - after the caddie, the agent, three tax jurisdictions, and a transatlantic tax treaty - is quite different.

April 17, 2026 · 7 min read
Yellow commercial jet with landing gear down, flying toward dark storm clouds.
Spirit Airlines

Spirit Airlines Is Going Out of Business. Here's What Could Happen to Your Tickets, Miles, and Money.

Spirit could liquidate this week. Here's the plain-English guide to what that means for every dollar you've given them - and what history says about what you'll get back.

April 16, 2026 · 8 min read
Calendar and tax forms illustrating the April 15 tax filing deadline
Tax Day 2026

Tax Deadline 2026: April 15 Is Here. Here's Exactly What Happens If You Miss It.

Tax Day 2026 is here. Two completely different situations - one where missing the tax filing deadline is costly, one where it barely matters. Most people don't know which one they're in.

April 13, 2026 · 7 min read
Split scene: house with chart versus apartment building, representing rent versus buy
rent vs buy

Renting vs. Buying in 2026: We Did the Full Math So You Don't Have To

Side-by-side numbers for a $400,000 home vs renting: year-one cash flow, 10-year net worth, break-even timing, and what usually gets left out of the debate.

April 9, 2026 · 12 min read
Abstract house and finance concept: mortgage payments and amortization
mortgage year one

The True Cost of Your Mortgage in Year One Will Shock You

How a $400,000 home loan actually works - and what your bank does not lead with. Year-one payment split, hidden costs, amortization crossover, and what one extra payment can save.

April 7, 2026 · 9 min read
Illustration of tax documents, coins, and growth - what to do with your tax refund
tax refund 2026

What To Do With Your Tax Refund in 2026: The Smart, the Dumb, and the Math

Average refunds are up in 2026. Here is how to prioritize debt, investing, and emergency savings - with the math behind each choice.

April 6, 2026 · 10 min read
Comparison of mortgage payoff versus investing extra money
pay off mortgage early or invest

Should I Pay Off My Mortgage Early or Invest? (Complete Analysis 2026)

Compare paying extra on your mortgage versus investing the difference. Real math, tax impact, and a decision framework so you can choose the right strategy for your situation.

March 6, 2026 · 14 min read
Car affordability guide for $50,000 salary: budget and best choices.
car on 50k salary

How to Buy a Car on a $50,000 Salary: The Complete 2026 Guide

Making $50K a year? Learn exactly what car you can afford, realistic monthly payments, and the best vehicles in your budget. Includes calculator and real examples.

February 26, 2026 · 12 min read
FIRE number calculator showing target portfolio amount
FIRE number

What Is My FIRE Number? (And How Do I Calculate It?)

Learn what your FIRE number means, how the 25x rule works, and how to calculate your target in minutes.

February 24, 2026 · 8 min read
Early retirement planning with FIRE number illustration
retire at 40

Can You Really Retire at 40? The Math Behind Early Retirement

See the savings rates, timelines, and tradeoffs that make retiring at 40 realistic or not.

February 24, 2026 · 9 min read

Formula Quick Reference

Core relationships behind these calculators—typically dollars, rates as decimals or percentages, and years or payment counts depending on the tool.

FormulaEquationVariablesResult unitCalculator
Compound growthA = P(1 + r/n)^(nt)P = principal, r = annual rate, n = periods/year, t = years$ (future value)Use calculator →
Loan / mortgage paymentM = P × [r(1+r)^n] / [(1+r)^n − 1]P = principal, r = rate per period, n = number of payments$ / periodUse calculator →
Return on investmentROI = (V₁ − V₀) / V₀ × 100%V₀ = start value, V₁ = end value%Use calculator →
Net worthNW = Σ assets − Σ liabilitiescash, investments, property minus debts$Use calculator →
FIRE rule of thumbFI ≈ annual spend × 25based on ~4% initial withdrawal discussion$ (target)Use calculator →
Hourly → annualannual = hourly × hours/week × weeks/yearadjust weeks for unpaid time off$ / yearUse calculator →
Salary → hourlyhourly = salary ÷ (hours/week × weeks/year)same hours/week assumption as conversion$ / hourUse calculator →
Tip totaltotal = bill × (1 + tip%)before split among diners$Use calculator →

Watch & Learn

Short lessons on interest, saving, and how loan balances evolve—useful context before you plug numbers into the calculators.

Introduction to interest | Interest and debt | Finance & Capital Markets

Simple vs compound interest—foundation for savings growth and the logic behind our compound interest calculator.

Khan Academy~10 min

The rule of 72 for compound interest | Interest and debt

Quick mental math for doubling time—pairs well with long-term savings and retirement scenarios.

Khan Academy~9 min

Amortization and depreciation | Finance & Capital Markets

How loan balances decline over scheduled payments—context for mortgage and loan payment tools.

Khan Academy~13 min

Frequently Asked Questions

Common questions about loans, growth, and planning—answered directly.