Money answers you can actually verify
73 calculators. Every one prints the formula behind the figure and a worked example you can check by hand.
Seven groups, 73 tools
Pick the group your question lives in. Every calculator answers as you type, publishes its formula, and shows a worked example you can check by hand.
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Cars and driving
What a car really costs, and the traps between the forecourt and the last payment.
13 tools -
Home and mortgage
Buying, borrowing against, and paying off a home.
12 tools -
Debt and credit
Getting out of debt, and understanding what it is costing you meanwhile.
12 tools -
Pay and tax
What actually reaches your account, and what the tax system does on the way.
8 tools -
Saving and budgeting
Building a cushion, and making the money you keep work harder.
8 tools -
Retirement
Getting there, and turning what you built into an income.
12 tools -
Insurance and life events
Protecting what you have, and paying for the things that change everything.
8 tools -
Not sure where to start?
Most people start with their paycheck. It is the number everything else is built on.
Check your pay
Where most people start
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Compound Interest Calculator
Watch savings and investments grow with monthly contributions - chart, year-by-year table, and the crossover point where interest out-earns your deposits.
Calculate growth → -
Loan Calculator
Monthly payment, total interest, and exactly what extra payments save you on any personal, auto, or student loan.
See the real cost → -
Mortgage Calculator
Your full monthly house payment - principal, interest, taxes, insurance, and PMI awareness built in.
Price a home → -
Retirement Calculator
Project your nest egg to any retirement age and see the monthly income it could safely support.
Project your nest egg → -
Debt Payoff Calculator
Enter up to four debts and compare avalanche vs. snowball side by side - payoff date and interest for each.
Compare strategies → -
Savings Goal Calculator
The exact monthly amount to hit any goal by any date - with interest doing part of the work.
Set your target → -
Emergency Fund Calculator
Your personal safety-net number from real expenses and income stability - plus a staged plan to build it.
Find your number → -
50/30/20 Budget Calculator
Split any paycheck into needs, wants, and savings in two seconds - with presets for expensive cities.
Split your paycheck →
Guides in plain English
Real figures, no jargon, no lectures. Every guide pairs with a calculator so you can reproduce what you just read.
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How Compound Interest Works
The one financial force that quietly decides who ends up wealthy - with a $200/month proof.
Read the guide → -
How Much House Can I Afford?
The 28/36 rule applied to real incomes, and the trap of borrowing what the bank approves.
Read the guide → -
Debt Avalanche vs. Snowball
Both payoff methods on the same $23,000 of debt - and the hybrid most people should use.
Read the guide →
- APR vs. APY: The Difference
Two acronyms, opposite jobs. Why the gap between them is where banks make money.
- How Big Should Your Emergency Fund Be?
Three months? Twelve? The five factors that set your real number.
- How to Save $10,000 in a Year
The $833/month problem broken into moves that survive contact with real life.
How the numbers stay honest
Most finance sites are paid to send you somewhere. This one is not, so the arithmetic has nothing to hide.
The formula is on the page
Standard amortisation and compounding, the same mathematics banks use, printed in full underneath every calculator.
Every figure has a source and a date
Tax bands, wage bases and contribution limits come from the IRS and the Social Security Administration, each stamped with the day it was checked.
Nothing you type ever leaves your browser
There is no server that could see your salary, your balances or your goals, because none of it is sent anywhere.
How FolioFledge keeps its numbers honest
Standard formulas only. Every tool uses the same amortization, compound-interest, and annuity mathematics that banks and finance textbooks use - published in full on each calculator page, never “adjusted.”
Worked examples you can hand-check. Each page includes a complete example with the inputs, the math, and the result, so a skeptical reader (or a teacher grading homework) can audit any figure.
Private by architecture. Calculations run entirely in your browser. There is no server that could see your salary, balances, or goals, because none of it is ever transmitted.
Corrections outrank everything. Spot a wrong number? Tell us. verified corrections ship before anything else we're working on. Read the full methodology.
Common questions about FolioFledge
Are FolioFledge calculators really free?
Yes - every calculator is free, with no account, no email gate, and no locked "premium" results. The site is supported by advertising, which never changes what the tools compute.
How accurate are the results?
Each tool uses the same standard formulas banks and finance textbooks use - amortization, compound interest, future value of an annuity - and every page publishes its exact formula plus a hand-checkable worked example so you can verify any number yourself.
Do you store the numbers I enter?
No. All calculations run in your browser. Your incomes, balances, and goals never touch our servers. Inputs are only reflected in your page URL so you can bookmark or share a scenario - that link stays on your device unless you send it.
Is this financial advice?
No. FolioFledge is educational: the tools show what standard formulas say about the numbers you enter. For decisions like refinancing or investing, consult a licensed professional who knows your full situation.
Which calculator should I start with?
If you have high-interest debt, start with the Debt Payoff Calculator. Otherwise start with the 50/30/20 Budget Calculator to find your monthly savings number, then point that number at the Compound Interest Calculator to see what it becomes.