Finance Guides
Plain-English explainers on mortgages, loans, taxes, retirement savings, and more.
2026-05-10
What Is Net Worth and How Do You Calculate It?
Net worth is your assets minus your liabilities. Learn how to calculate yours, what the numbers mean by age, and the most effective ways to grow it.
Read more →Market History2026-05-10
The Tulip Mania: History's First Financial Bubble
In 1637, a single tulip bulb sold for more than a craftsman earned in four years. The story of tulip mania — history's first speculative bubble — still shapes how we think about markets.
Read more →Market History2026-04-26
The Dot-com Crash: What Happened When the Tech Bubble Burst
The dot-com bubble burst wiped out $5 trillion in market value between 2000 and 2002. Here is what caused it, what collapsed, and what investors learned.
Read more →Market History2026-04-24
The 2008 Financial Crisis: What Happened and What It Cost
A plain-English explanation of the 2008 financial crisis — the mortgage bubble, the bank failures, the bailout, and what the numbers meant for ordinary households.
Read more →Quick Reference2026-04-23
What Is a Roth IRA and How Does It Work?
A Roth IRA lets your money grow tax-free. Learn 2025 contribution limits, income eligibility rules, the 5-year rule, and who benefits most from opening one.
Read more →Quick Reference2026-04-19
What Is APR and How Does It Affect Your Loan?
APR (Annual Percentage Rate) is the true annual cost of borrowing. Learn how APR differs from interest rate, how to compare loans, and why it matters.
Read more →How-To Guide2026-04-19
How Does a Mortgage Work?
A clear explanation of how mortgages work: principal, interest, amortization, escrow, and the difference between fixed and variable rates.
Read more →Quick Reference2026-04-19
Compound Interest vs Simple Interest: What Is the Difference?
Simple interest is calculated only on the principal. Compound interest grows on both principal and accumulated interest. Learn when each applies and how to calculate them.
Read more →Quick Reference2026-04-19
What Is Debt-to-Income Ratio and Why Does It Matter?
Debt-to-income ratio (DTI) compares your monthly debt payments to your gross monthly income. Learn how to calculate it and what lenders consider acceptable.
Read more →How-To Guide2026-04-19
How Is Net Salary Calculated?
Net salary is your take-home pay after all deductions. Learn which taxes and withholdings reduce your gross salary and how to estimate your actual paycheck.
Read more →Quick Reference2026-04-19
What Is Inflation and How Does It Affect Your Money?
Inflation reduces the purchasing power of money over time. Learn how inflation is measured, what causes it, and how to protect your savings from its effects.
Read more →How-To Guide2026-04-19
How Does Inflation Erode Your Savings?
Learn how inflation quietly reduces your purchasing power over time — and what you can do to protect your savings.
Read more →How-To Guide2026-04-19
Snowball vs Avalanche: Which Debt Payoff Method Is Better?
The debt snowball targets your smallest balance first. The debt avalanche targets the highest interest rate. Learn which saves more money and which works better psychologically.
Read more →Quick Reference2026-04-19
What Is Compound Interest and How Does It Grow Your Money?
Compound interest is interest earned on both principal and accumulated interest. Learn how it works, why starting early matters, and how to calculate your returns.
Read more →How-To Guide2026-04-19
How Much Should You Save for Retirement?
Learn the most widely used retirement savings guidelines, how the 4% rule works, and how to calculate your personal retirement number using our free calculator.
Read more →Quick Reference2026-04-19
What Is Amortization and How Does It Work?
Amortization is the process of paying off a loan through scheduled payments. Learn how amortization schedules work, how interest and principal split each payment, and what affects the schedule.
Read more →How-To Guide2026-04-19
How Much House Can I Afford?
Use the 28/36 rule and income-based guidelines to estimate how much house you can afford. Includes examples for common income levels.
Read more →How-To Guide2026-04-19
How Big Should Your Emergency Fund Be?
An emergency fund covers unexpected expenses without going into debt. Learn how much to save, where to keep it, and how to build one from scratch.
Read more →Quick Reference2026-04-19
How Is a Tax Refund Calculated?
A tax refund is the difference between taxes withheld and taxes actually owed. Learn how withholding works, what affects your refund, and whether a refund is actually good.
Read more →Quick Reference2026-04-19
What Is an Interest Rate?
An interest rate is the cost of borrowing money, expressed as a percentage. Learn how interest rates work for loans and savings, what determines them, and how the Fed influences them.
Read more →How-To Guide2026-04-19
How Is a Monthly Loan Payment Calculated?
Learn the formula behind monthly loan payments, how interest rate and term affect your payment, and how to calculate it by hand or with a calculator.
Read more →Quick Reference2026-04-19
What Is a 401(k) and How Does It Work?
A 401(k) is a tax-advantaged retirement savings account offered by employers. Learn how contributions work, what the limits are, and the difference between traditional and Roth 401(k).
Read more →How-To Guide2026-04-19
How to Create a Monthly Budget That Actually Works
A monthly budget helps you track income and expenses, eliminate waste, and build wealth. Learn the 50/30/20 rule and step-by-step budgeting methods.
Read more →Quick Reference2026-04-19
What Is a Credit Score and How Is It Calculated?
A credit score is a three-digit number that summarizes your creditworthiness. Learn how FICO scores are calculated, what affects them, and how to improve yours.
Read more →How-To Guide2026-04-19
How Long Will It Take to Reach Your Savings Goal?
Use the savings goal formula to calculate how long it will take to save a target amount. Includes examples for emergency funds, down payments, and vacations.
Read more →Quick Reference2026-04-19
What Is VAT and How Is It Calculated?
VAT (Value Added Tax) is a consumption tax used in most countries. Learn how VAT works, how to calculate prices with and without VAT, and how it differs from US sales tax.
Read more →