Interest Rate Calculator
Loan Details
Calculated Rates & Costs
| Interest Rate | — |
|---|---|
| Effective Annual Rate (APY) | — |
| Total Payments | — |
| Total Interest Paid | — |
Solving for Loan Interest Rates
Sometimes, auto dealers or private lenders advertise a loan amount and monthly payment without explicitly naming the interest rate. By knowing the loan amount, term, and payment size, this calculator solves for the actual underlying interest rate using numerical root-finding algorithms.
Nominal Rate vs. Effective Annual Rate (APY)
- The **Nominal Rate** is the annual rate before compounding is considered. - The **Effective Annual Rate (APY)** accounts for compounding over the year. Because loan payments are monthly, interest compounds monthly, making the APY slightly higher than the nominal rate.
Disclaimer. This calculator is for informational purposes only. It assumes a fixed interest rate and steady amortizing monthly payments.