Free Financial Calculators Online

Simple, transparent tools for the biggest money decisions. Every calculator runs entirely in your browser — no signup, no data leaves your device.

Last updated: September 12, 2026

Why these exist

Eighteen decision tools, one zero-bias goal: answer the question with real math, not sales pressure.

Each tool shows its assumptions, its sources, and when the conventional wisdom breaks. Results update as you type — there is no Calculate button to hide behind, and no lead capture between you and the answer.

Most mortgage and personal-finance calculators exist to funnel you toward a lender. These are different: each one is a standalone decision tool that answers a specific question with transparent public-formula math, and then explains why — the assumptions, the edge cases, and when the standard advice stops being right.

They're built to be trustworthy first. All calculations run client-side (nothing is uploaded), the underlying formulas are published and defensible, and the data defaults come from public sources you can check yourself.

Choose a calculator

Income & Taxes
Take-Home Pay NEW	What actually lands in your account — federal, FICA and your state's income tax, with the 401(k) asymmetry that no bracket explains.
Salary Comparison NEW	Two offers, two salaries, or one salary in two states — compared after tax, plus the gross the smaller offer would need to match.
Home & Mortgage
Mortgage Payment NEW	What the monthly payment really includes — with your county's actual property tax rate.
Rent vs Buy	Is it cheaper to rent or buy over my planned horizon?
Refinance Break-even	Does refinancing pay for itself before I move?
Home Affordability	How much house can I actually qualify for?
Debt & Borrowing
Credit Card Payoff NEW	How long the balance takes to clear — and what paying only the minimum really costs.
Extra Payment Payoff NEW	What an extra monthly payment or a bi-weekly schedule saves in interest and years.
Snowball vs Avalanche NEW	Several cards, one budget: which account to attack first, and what that choice is actually worth.
Student Loan Refi	Is a private refinance worth losing federal protections?
Auto Loan NEW	The true cost of a car loan, with your state's sales tax rate and its trade-in rule.
Save & Invest
Compound Interest NEW	What a starting balance plus monthly contributions becomes — after tax and inflation.
Inflation / Purchasing Power NEW	What a past amount is worth today, using the full CPI series back to 1913.
Savings / CD / APY NEW	What a deposit actually earns — and why APY and APR are not the same number.
Retirement
Social Security Claiming	Claim early (62) or delay (70)?
Retirement & 401(k) NEW	What your deferrals, the employer match and the real IRS limits grow into — and the income it supports.
IRA vs Roth NEW	Which account wins at your tax rate — compared on equal money out of your pocket, not equal contributions.
RMD Calculator NEW	When forced distributions begin, by the year you were born — 73 or 75 — and what they cost.

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