Financial clarity starts here.
Calculate smarter. Make better decisions.
Free financial calculators for mortgages, loans, savings, investing, retirement and more.
Popular Calculators
Calculate the numbers that matter most.
Mortgage Calculator
Estimate your monthly payment, interest and full amortization.
Compound Interest Calculator
See how your money grows with compound interest over time.
Auto Loan Calculator
Plan your car payment with price, trade-in and loan terms.
Mortgage Payoff Calculator
How long until your mortgage is paid off — and what an extra payment does.
Refinance Calculator
Compare your current loan against a new rate and term.
Home Affordability Calculator
How much house can you afford based on your income and debts?
Loan Payment Calculator
Estimate the monthly payment and total interest for any amortizing loan.
Credit Card Payoff Calculator
How long it takes to clear your card balance — and what minimums really cost.
Debt Payoff Plan Calculator
Snowball vs avalanche: the fastest way to clear your debts.
Savings Goal Calculator
How much to save each month to hit your goal.
Dividend Calculator
How much a stock pays you in dividends each year.
401(k) Match Calculator
How free employer money boosts your retirement savings.
Retirement Withdrawal Calculator
How long your savings last in retirement.
Federal Income Tax Calculator
Estimate your federal tax and take-home pay.
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Find the right tool for your financial question.
Free online tools
Everyday utilities for generating, editing and live data — all free, in your browser, no sign-up.
Popular online tools
Everyday utilities for generating, editing and live data — free, in your browser, no sign-up.
Mortgage Calculator
Estimate your monthly payment, total interest and amortization — live, right here.
Based on a $400,000 home, 20% down, at a 30-year fixed rate.
View CalculatorMortgage Calculator
Monthly payment
$1,970/month
Free, accurate and private tools
What you can calculate
Tooliv0 is a free library of financial calculators and interactive tools built around one idea: the numbers you need should be clear, accurate and private. Every calculator runs entirely in your browser, so your figures never leave your device — no account, no sign-up, no data collection.
Our coverage spans mortgages, auto loans, personal loans, savings, investing, retirement, income taxes and everyday utilities. Each tool shows its formula, a worked example and the assumptions behind the result, so you can trust not only the answer but also the method that produced it.
Whether you are deciding between a 15- and 30-year mortgage, planning a savings goal decades away, working out what a car really costs, or just totaling a percentage quickly — the calculator you need is here, free, and built with professional-grade math.
Why use Tooliv0
Built like a product, not a link farm.
Accurate calculations
Built using documented formulas and verified against published reference scenarios.
Free to use
No account, no sign-up, no credit card. Every tool is 100% free.
Privacy first
We don't require your financial information. Calculations run entirely in your browser.
Transparent methodology
Every formula, assumption and test case is published on each calculator page.
Financial guides
Understand the numbers behind your decisions.
Trusted by the math, not by claims
The engineering behind every calculator on this site.
Documented formulas
Every calculator publishes its exact formula and what each variable means.
Reference-tested
Outputs are cross-checked against published reference cases before launch.
Edge-case hardened
Zero, negative and extreme inputs are validated with automated unit tests.
Continuously verified
Each update re-runs the full test suite so results never silently drift.
Frequently asked questions
Are your calculators really free?+
Yes. Every calculator and tool on Tooliv0 is 100% free with no account, no sign-up and no credit card required.
Do I need to install anything?+
No. All tools run directly in your browser with no downloads or plugins. Results update instantly as you change your inputs.
Will my calculations be stored?+
Never. All calculations happen locally on your device. We do not collect, store or transmit any numbers you enter.