Curated list · 13 tools
Best Free Finance Calculators
Free finance calculators: mortgage, loan, compound interest, budget, tax, 401(k), Roth IRA, retirement, debt payoff. No signup, in-browser, mobile-friendly.
Most life-changing money decisions are also basic math with a calculator: how much house, how much retirement, how much a loan really costs, how fast a credit card gets paid off. These thirteen calculators cover the ones that matter. None of them asks for an email, none of them sells your data to a mortgage broker.
The full list
01 · Loan Calculator
Loan Calculator
Monthly payment and total interest on any loan — car, personal, student, or business. Three inputs, instant math.
02 · Mortgage Calculator
Mortgage Calculator
Full mortgage payment breakdown including principal, interest, taxes, and insurance — with an amortization preview.
03 · Compound Interest Calculator
Compound Interest Calculator
The most important calculator in investing: see what monthly contributions grow into over 10, 20, 30 years.
04 · Monthly Budget Calculator
Monthly Budget Calculator
50/30/20 budget split — needs, wants, savings — with live percentages from your monthly income.
05 · Income Tax Calculator
Income Tax Calculator
Estimate your federal income tax given filing status, income, and standard deduction. No IRS login required.
06 · 401(k) Calculator
401(k) Calculator
Project your 401(k) balance at retirement, including employer match and realistic return assumptions.
07 · Roth IRA Calculator
Roth IRA Calculator
Tax-free growth projection on Roth IRA contributions — the calculator that nudges most people to actually open one.
08 · Retirement Calculator
Retirement Calculator
Are you on track? Enter current balance, monthly savings, and target age to see the answer without spreadsheet math.
09 · Debt Payoff Calculator
Debt Payoff Calculator
Compare avalanche vs. snowball payoff strategies on your actual balances — and see how fast extra payments change the finish line.
10 · Paycheck Calculator
Paycheck Calculator
Work out take-home pay from gross salary, accounting for federal tax, FICA, and retirement deductions.
11 · Savings Goal Calculator
Savings Goal Calculator
Given a target ($20k emergency fund, $50k down payment), see how much to save per month to hit a date.
12 · Net Worth Calculator
Net Worth Calculator
Assets minus liabilities, with a worksheet to fill in. Track it quarterly and you'll see whether your financial life is actually improving.
13 · Tip Calculator
Tip Calculator
Bill total, tip percent, and split between people — the one you'll actually use most weeks of the year.
The three numbers most people never calculate
If you do nothing else, calculate three things: your net worth today (Net Worth Calculator), your monthly take-home pay (Paycheck Calculator), and the compound growth on contributing 10 percent of that for 30 years (Compound Interest Calculator). Those three numbers reframe most money decisions. A $400 monthly subscription habit looks different when you can see it as $490,000 of foregone retirement.
Order of operations for a financial plan
A rough order that works for most people: build a one-month emergency fund, pay off anything above 8 percent APR (Debt Payoff Calculator), capture the full 401(k) match, build three to six months of expenses (Savings Goal Calculator), then max a Roth IRA (Roth IRA Calculator), then increase 401(k) contributions. Every step after 'capture the match' is optional, but running the compound interest math will make step-six feel urgent.
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