Motorcycle Loan Refinance Calculator

Periodic payment calculations use a standard amortizing loan formula where periodic interest rate = annual rate / payments per year, and payment = r*P / (1-(1+r)^-n). For numerical stability and predictable rounding we follow IEEE floating point conventions and design to minimize catastrophic cancellation in intermediate steps.

Model limitations and quality controls reference ISO quality management principles for repeatable calculations and record keeping, and we operate with an accuracy disclaimer consistent with best practices for consumer tools. For digital security and data handling we reference NIST guidance on integrity and authentication; the tool itself does not store personal data beyond a single session.

Bi‑weekly impact is provided as an approximation showing extra annual paid amount when splitting monthly payments into bi‑weekly halves (26 half‑payments per year). Exact interest and payoff time effects require a full per‑period amortization schedule that accounts for payment dates, compounding conventions, and any lender rounding rules.

Example 1: Remaining principal $8,000, current rate 6% with 3 years left (monthly). Refinance to 5% for 3 years with $200 fees. The tool shows current vs refinance periodic payments, total cost difference and annualized savings.

Example 2: If you split your monthly payment into bi‑weekly halves, the tool reports the extra annual amount paid due to the 26 half‑payments per year. That extra annual payment accelerates principal reduction and shortens payoff, but exact months saved should be computed from a full amortization schedule.