FinCalc

Financial Guides & Tips

Practical guides to help you pay off debt, build savings, invest smarter, and make better financial decisions — all backed by real math.

·8 min read

How Much House Can You Afford on a $70,000 Salary?

The 28/36 rule lenders actually use, run on a $70k salary — with real numbers on down payments, existing debt, and how much mortgage rates alone move the ceiling.

mortgageaffordabilitybudgeting
·8 min read

Rent vs Buy in 2026: The Real Math Nobody Shows You

A full rent vs buy comparison with real numbers: the 5% rule gut check, 10-year equity vs investment returns, and the transaction costs most advice ignores.

rent vs buymortgageinvesting
·8 min read

The 4% Rule Explained: How to Calculate Your FIRE Number

What the 4% rule really says, how to calculate your FIRE number with the 25x shortcut, and the honest limitations before you bet your retirement on it.

retirementFIREinvesting
·7 min read

How Much Car Can You Afford? The 20/4/10 Rule Explained

Use the 20/4/10 rule to find a car price that fits your income — with real numbers by salary, the true cost of long loans, and dealership traps to avoid.

car loanbudgetingdebt
·6 min read

APR vs APY: The Difference That Costs You Money

APR is the sticker rate, APY is what you actually pay or earn after compounding. Learn to convert between them and compare rates like a pro.

interest ratessavingscredit cards
·8 min read

How to Pay Off Debt Fast: Snowball vs Avalanche Method

Compare the two most popular debt repayment strategies and find out which one saves you more money — and which one keeps you motivated.

debtbudgetingstrategy
·7 min read

What Should Your Net Worth Be at 30, 40, and 50?

Benchmarks for net worth by age, how to calculate yours, and actionable steps to grow it faster regardless of your starting point.

net worthsavingsmilestones
·7 min read

How Much Emergency Fund Do You Really Need?

The complete guide to emergency funds: how much to save, where to keep it, and a step-by-step plan to build yours from scratch.

emergency fundsavingsplanning
·8 min read

The 50/30/20 Budget Rule Explained with Examples

A practical guide to the 50/30/20 budgeting framework with real-world examples, common mistakes, and tips to make it work at any income level.

budgeting50/30/20planning
·6 min read

Compound Interest: How $100/Month Becomes $100,000

See the real math behind compound interest and how small, consistent investments can grow into life-changing wealth over time.

compound interestinvestinglong-term