Motorcycle Loan Interest Calculator with Bi-Weekly Payments

Monthly amortization uses the standard annuity formula where the periodic rate r = APR/12 and the number of payments n = term (years) × 12. Payment = principal × r / (1 − (1 + r)^−n).

True bi‑weekly amortization treats each two‑week period as a payment period (26 periods per year). The periodic rate is APR/26 and the number of periods is term × 26. This produces more payments per year than a 'half‑monthly' approach and typically reduces total interest.

Calculations replicate both schedules algebraically inside the tool to compute comparable totals. Extra payments are added to each scheduled payment if provided, and reduce outstanding principal immediately for subsequent period interest calculations in practical application.

True bi‑weekly schedules (26 payments/year) generally reduce total interest versus 12 monthly payments because more frequent payments reduce average outstanding principal sooner.

Differences depend on APR, term, rounding, payment application timing, and lender handling of partial periods or fees. Use results as an estimate; check your lender's exact schedule and policies.

Example: $10,000 loan, 6% APR, 5 years. Monthly payment ≈ standard result; true bi‑weekly payment ≈ lower equivalent monthly amount and may save interest because you make the equivalent of 13 monthly payments per year (26 bi‑weekly payments × payment size / 12).

Example: Zero APR (0%). The calculator falls back to equal principal division across periods (principal / number_of_payments).