Personal Finance Calculators
Most personal finance questions come down to three variables: how much, at what rate, and for how long. These calculators handle the compounding math and turn the answer into something useful: a date, a monthly amount, or a total. Each one shows its formula and assumptions.
All personal finance calculators
The order of operations for your money
A widely used order: cover minimum payments and a small cash buffer first. Capture any employer retirement match, which is an instant 50–100% return. Pay down high-interest debt, which is a guaranteed return equal to the interest rate. Build a 3–6 month emergency fund. Then put the surplus toward goals and long-term investing.
Compounding drives every calculator here. It works for you in savings and retirement accounts, and against you in debt. Its two levers are rate and time, and for most savers time is the stronger one. Money invested at 25 has about three times the growth of money invested at 45 at the same return. Start early, automate contributions, and let time do the work.
Frequently asked questions
Should I pay off debt or save first?
Compare interest rates. A 22% credit card beats any savings account, so high-interest debt usually comes first, after a small starter emergency buffer. Low-rate debt like a mortgage can coexist with saving and investing.
How much of my income should I save?
A common benchmark is 20% of take-home pay across all goals (the 50/30/20 rule), with 10–15% of gross income going to retirement. If that is out of reach, start with any automated amount and increase it over time.
Do these calculators account for inflation?
They compute in nominal terms, but you control the assumptions. Enter a return net of inflation (say 6% instead of 9%) and long-term projections read roughly in today's purchasing power.
Last updated . Formulas are shown on the page and checked against the worked example.