Money Math Calculators & Converters

Save to Pinterest

The formulas behind real-world money math — compound interest, loan amortization, mortgage payments, and APR vs APY. Every tool in this category applies a named financial formula to the numbers you provide and shows the math. We do not give financial advice. For decisions about your money, consult a qualified professional.

All Money Math Tools

Compound Interest Calculator

Calculate compound interest with optional monthly contributions. See final balance, total interest earned, and a year-by-year breakdown chart.

Loan Amortization Calculator

Calculate your monthly loan payment and see a full amortization schedule. Enter an extra payment to see how much interest and time you save.

Mortgage Payment Calculator

Estimate your monthly mortgage payment including principal, interest, property tax, insurance, HOA, and PMI. Shows the math behind each component.

APR to APY Calculator

Convert APR to APY or APY to APR for any compounding frequency. Understand the difference between stated and effective interest rates.