Free Financial Calculators That Just Work
Kingo gives you fast, accurate calculators for loans, mortgages, investing, retirement and everyday money decisions. Every calculator runs entirely in your browser — nothing is uploaded, no account is needed, and there are no paywalls. Pick a calculator below and get your answer in seconds.
Loans & Mortgages
Investing & Growth
Savings & Goals
Why use Kingo?
Most finance calculator sites bury the tool under ads, pop-ups and sign-up walls. Kingo does the opposite: the calculator is the page. Each tool loads instantly, works offline once loaded, and shows not just a headline number but the breakdown behind it — monthly payment versus total interest, principal versus growth, years versus months.
Every calculator also comes with a plain-English explanation of the math it uses, so you can check the numbers yourself or rebuild them in a spreadsheet. If you want to go deeper, each page links to related calculators that answer the natural next question — for example, the mortgage payment calculator pairs naturally with the loan payment calculator when you are comparing a 15-year versus 30-year term.
Start with one of the tools above, or jump straight to the most popular ones: compound interest, mortgage payment, and retirement savings.
Which calculator do I need?
Most money questions map to one of these nine tools. If you are not sure where to start, find your question in the left column:
| Your question | Use this |
|---|---|
| What will my monthly mortgage payment be? | Mortgage Payment Calculator |
| Is 15 years worth the higher payment? | Mortgage Payment Calculator — run both terms |
| What does this personal loan really cost? | Loan Payment Calculator |
| Can I afford this car? | Auto Loan Calculator |
| When will my credit card be paid off? | Credit Card Payoff Calculator |
| What will my savings be worth in 20 years? | Compound Interest Calculator |
| What annual return did this investment produce? | CAGR Calculator |
| Did this trade actually make money? | Stock Profit Calculator |
| How much do I need to save each month? | Savings Goal Calculator |
| Will I have enough to retire? | Retirement Savings Calculator |
| What is 15% of this number, or this price after a discount? | Percentage Calculator |
How accurate are the results?
Each calculator uses the standard formula a lender or fund provider would use, not an approximation. Loan and mortgage payments come from the amortization formula M = P × [r(1+r)^n] / [(1+r)^n − 1]. Compound growth is calculated on the compounding frequency shown on each page. CAGR is (End ÷ Start)^(1 ÷ years) − 1. Results are rounded for display; the underlying arithmetic is not.
That means the numbers you see are what the math says, which is not always what your lender will quote. Small differences usually come from fees rolled into the loan, daily rather than monthly interest accrual, or a rate that changes partway through.
What these calculators leave out
They model the loan or the growth curve, nothing else. A real mortgage payment usually includes property tax, homeowner's insurance and possibly PMI; a car loan sits alongside insurance, fuel and maintenance; investment returns are reduced by fund fees and taxes. None of that is here, because all of it depends on details we do not ask for and could not guess.
Treat the output as the shape of the decision, not the final bill. It tells you whether a 15-year term is affordable, whether a balance will ever clear, whether 5% or 7% changes the plan — which is what you actually need before talking to a lender, a broker or yourself.