Finance

Finance Calculators

Financial decisions rarely come with a clear number attached. How much can you actually afford to borrow? What does an extra $200 a month toward your mortgage principal actually save you over the life of the loan? How does compounding frequency change the real return on your savings? These questions have precise mathematical answers — the tools below are built to find them.

Each finance calculator on ATNAX is based on standard financial formulas used by banks, actuaries, and economists. The compound interest calculator uses the exact formula as documented in financial mathematics literature. The mortgage calculator models a standard fully amortizing loan. The salary calculator handles every common pay period used in North American and European employment contracts. Results are shown with enough detail that you can understand the assumptions, not just accept the output.

A note on what these tools are for: they are calculation aids, not financial advice. They give you accurate numbers based on the inputs you provide. What you do with those numbers — whether to take out a loan, how aggressively to save, which job offer to accept — is a decision that belongs to you, ideally in consultation with a financial professional who knows your full situation. The math is the math; the judgment is yours.