Every calculator, in one place.

Housing is the biggest check most people ever write, so this group gets seven tools: what the monthly payment really is once taxes and PMI are counted, the month that PMI can come off, how much house your income honestly supports, how much rent it supports if you keep renting, whether renting or buying wins over the years you'd actually stay, when a lower rate is worth its closing costs, and what paying every two weeks buys you. Every one shows its math.

Debt math is where fuzzy thinking costs the most, because the interest meter runs whether or not you look at it. These eleven put dollar figures on the choices: what a loan costs per month and in total, which payoff order clears several debts fastest, what an extra payment buys, where a student loan — or any loan — lands at the payment you actually make, what your payments look like to a lender as a share of your income, what really happens when you pay only the card's minimum, what one billing cycle of card interest costs, and how much of each card's limit you're using. None of them will tell you what to do — they show what each option costs, in your numbers.

The other side of the compounding coin: the same math that drags out a credit card balance grows a savings account, a 401(k), and an emergency fund — slowly, then suddenly. These eight cover the building side — up to the balance that could pay for your life — plus the two bits of everyday arithmetic people actually search for: percentages and splitting a bill without a spreadsheet.

When someone dies, the person settling the estate inherits a set of numbers nobody teaches: what the executor is owed, what the attorney is owed, and what the court charges. Five states set those by statute or recognized schedule, and these tools compute them — plus the whole bill, itemized.

Six of these can run on your own site, free — see all embeddable calculators for the copy-paste snippets.