About PayoffWorks
This site is built by someone who runs a farm in the Blue Ridge Mountains.
The calculators started as the spreadsheets that farm uses to keep input loans, equipment payments and land rent straight, especially in the months when several of them come due at once. The math behind them is the same math a lender uses: simple interest by the day for input and operating money, standard amortization for equipment, and present value for lease-or-buy. Each calculator page writes out its formula so you can check it.
How the tools are made
- Every calculator runs in your browser. Nothing you type is sent to a server or saved.
- Formulas are checked against worked examples, like textbook loan payments and hand-calculated interest, before a page goes up.
- Pages are updated when something is wrong or unclear. If you spot a mistake, please say so.
How the site pays for itself
The calculators are free. The site is paid for by optional spreadsheet templates sold through Payhip: a free farm due-date tracker, a paid farm planner, and a household bill tracker. You never need to buy anything to use a calculator.
Contact
Questions, corrections or ideas for a tool: [email protected].