Finance calculators
Every calculator here shows the formula it uses, works through real examples, and says what happens at the edges.
- Balloon Payment Calculator
Work out the monthly payment on a balloon loan, the lump sum due at the end of the term, and how much the lower payment costs in extra interest.
- Biweekly Mortgage Payment Calculator
See what paying half the monthly mortgage every two weeks does: 26 half-payments a year is 13 monthly payments, and the loan ends years earlier.
- Compound Interest Calculator
Work out what a lump sum plus regular deposits grows to at monthly, quarterly or daily compounding — and see how much of the final balance is interest.
- Credit Card Minimum Payment Calculator
See how long a credit card balance takes to clear if you only ever pay the minimum — and why the minimum shrinks as the balance falls. Includes the case where it never clears at all.
- Debt Payoff Calculator
Work out how many months a fixed monthly payment needs to clear a balance, how much interest it costs, and the payment below which the debt never clears at all.
- Down Payment Calculator
Work out the down payment on a house, the loan that follows, and how far short of the 20% line you are — the point where mortgage insurance usually stops.
- Mortgage Extra Payments Calculator
See what an extra monthly payment, an annual lump sum, or both do to a mortgage: how many years come off the term and how much interest disappears.
- Mortgage Calculator
Work out the monthly payment on a home loan, and see what the loan costs in total once interest is included. Compare terms side by side before you commit.
- Savings Goal Calculator
Work backwards from a target: enter what you want to end up with and see the monthly deposit it takes, including the interest those deposits earn along the way.
- Simple Interest Calculator
Work out simple interest, where the interest never earns interest of its own. Shows the yearly breakdown and compares the result against compounding.