Financial · 26 calculators

Financial Calculators

Q: How accurate are the results?

Each tool uses the standard financial formula for that calculation. Results are reliable estimates for planning and comparison, but they are not personalised financial advice — check with a professional before making big decisions.

Q: Which calculator should I use for buying a home?

Start with the Home Affordability Calculator to set a budget, then use the Mortgage Calculator to see the monthly payment, and Rent vs. Buy to sanity-check the decision.

Q: Do you store the numbers I enter?

No. Every calculation runs entirely in your browser — the figures you type are never sent to or stored on a server.

Run the numbers on loans, mortgages, savings, investing, retirement, and income. Free, accurate, and private — every calculation happens right in your browser, with no sign-up.

Jump to Loans & Debt Mortgage & Home Savings & Investing Retirement Income & Tax

Loans & Debt

Loan Calculator

Monthly payment, total interest, and amortization for any fixed-rate loan.

Auto Loan Calculator

Car payment including down payment, trade-in, and sales tax.

Personal Loan Calculator

Payments and total cost for an unsecured personal loan.

Student Loan Calculator

Repayment schedule and lifetime interest on student debt.

Debt Payoff Calculator

Snowball or avalanche timeline to become debt-free.

Credit Card Payoff Calculator

How long to clear a balance at a chosen monthly payment.

Mortgage & Home

Mortgage Calculator

Principal, interest, taxes, and insurance on a home loan.

Home Affordability Calculator

How much house your income and debts can comfortably support.

Refinance Calculator

Compare your current mortgage to a new rate and term.

Mortgage Payoff Calculator

Interest saved by paying your mortgage off early.

Rent vs. Buy Calculator

Whether renting or buying works out cheaper over time.

Down Payment Calculator

What to put down and how it changes your monthly payment.

Savings & Investing

Compound Interest Calculator

Growth of savings as interest compounds over time.

Investment Calculator

Future value of a lump sum plus regular contributions.

Savings Goal Calculator

Monthly amount needed to hit a target by a set date.

Simple Interest Calculator

Interest on a principal with no compounding.

ROI Calculator

Return on investment as a total and annualized percentage.

CD Calculator

Maturity value of a certificate of deposit.

Retirement

Retirement Calculator

Whether your savings will last through retirement.

401(k) Calculator

Projected balance with your contributions and employer match.

Roth IRA Calculator

Tax-free growth of Roth contributions to retirement.

Annuity Calculator

Income an annuity pays out over time.

Income & Tax

Salary Calculator

Convert between hourly, weekly, monthly, and annual pay.

Income Tax Calculator

Estimate federal income tax and your take-home pay.

Paycheck Calculator

Net pay after taxes and deductions, per pay period.

Hourly Paycheck Calculator

Take-home pay from an hourly wage and hours worked.

About our financial calculators

Money decisions are easier when you can see the numbers. Whether you're sizing up a mortgage, working out how fast a debt will clear, or projecting how an investment grows, each tool here uses the same standard formula a bank or spreadsheet would — just faster and friendlier. Enter your figures and the result updates instantly.

These calculators give reliable estimates for planning and comparison. They don't account for every personal circumstance, so treat the output as a starting point rather than personalised financial advice.

Frequently asked questions

Are these financial calculators free?+

Yes. Every calculator on OnlineCalculators.com is completely free, with no sign-up, account, or app required.

How accurate are the results?+

Which calculator should I use for buying a home?+

Do you store the numbers I enter?+