Free personal-finance calculators
Fast, free, no-signup calculators that show you the real numbers — monthly payments, total interest, and a clear breakdown — with plain-English explanations of how each one works.
Mortgage Calculator
Estimate your monthly mortgage payment including principal, interest, and a full amortization schedule.
Auto Loan Calculator
Work out the monthly payment and total interest on a new or used car loan, with trade-in and down payment.
Compound Interest Calculator
See how an initial deposit plus monthly contributions grows over time, with contributions and interest earned broken out.
Retirement Savings Calculator
Project your 401(k) balance at retirement with employer match, salary growth, and decade-by-decade milestones.
Debt Payoff Calculator
Compare snowball and avalanche strategies across up to four debts and see which gets you debt-free cheaper.
Credit Card Payoff Calculator
See how long your credit card will take to pay off, the total interest, or the payment needed to hit a deadline.
Personal Loan Calculator
Estimate your monthly payment, total interest, and what an origination fee really costs you in cash received.
Refinance Calculator
Compare your current mortgage payment to a new rate and term, and find the break-even point on your closing costs.
Savings Goal Calculator
Find the exact monthly contribution needed to reach any savings target by your deadline, including compound growth.
Inflation Calculator
See what today’s dollars will buy in the future and how much you’d need to keep the same purchasing power.
Start from your question
Most people do not go looking for a calculator by name — they have a question. These are the ones we hear most, matched to the tool that answers them.
What will my monthly house payment actually be?
Mortgage calculator →Should I pay off my smallest debt first or the highest rate?
Debt payoff calculator →How long will it take to clear this credit card?
Credit card payoff calculator →What will my 401(k) be worth when I retire?
Retirement savings calculator →How much do I need to save each month to hit my goal?
Savings goal calculator →Is refinancing worth the closing costs?
Refinance calculator →
Understand the number, not just see it
All guides →Our guides explain the machinery behind the results — why early mortgage payments are mostly interest, what APR includes that the rate leaves out, how a card balance compounds daily.
How Loan Amortization Works
Why early loan payments are mostly interest, how the balance actually falls each month, and what extra principal payments really do.
15-Year vs. 30-Year Mortgage: The Real Cost Difference
Compare monthly payments, total interest, and equity build-up on the same loan at both terms, and see when each one makes sense.
Debt Snowball vs. Avalanche: Which Should You Use?
How the two payoff methods differ, what the interest gap looks like in real dollars, and how to pick the one you will actually stick with.
How Credit Card Interest Actually Works
Daily compounding, grace periods, and why minimum payments barely move the balance — with the math shown step by step.
Why SteadyCalc?
Most financial decisions come down to a few numbers: what will this cost me each month, how much interest will I pay over time, and what changes if I put more money down or pay it off faster? SteadyCalc answers those questions instantly, without asking you to create an account or hand over your email. Every calculator runs entirely in your browser, so the figures you type never leave your device.
Each tool comes with a clear explanation of the math behind it, a worked example checked against the same formula the calculator runs, and answers to the questions people ask most. The goal is simple: help you understand the number, not just see it. When a result surprises you — total interest on a 30-year mortgage usually does — the explanation underneath shows exactly where it came from.
The calculators are estimates for planning, not quotes. Your actual rate, payment, or balance depends on your lender, your credit, and current market conditions. We explain what each tool leaves out right on the page, and our About page covers how the tools are built and checked.