A personal loan gives you a fixed sum of money upfront that you repay in equal monthly installments over a set term, typically 12 to 60 months. Unlike credit cards, the rate is locked in at origination and the payoff date is predictable from day one. Whether you're consolidating high-rate debt, financing a home improvement, or covering an unexpected expense, understanding the math behind monthly payments and total interest helps you borrow at the lowest possible cost.
How Personal Loan Amortization Works
Enter the nominal contractual note rate; the monthly rate is annual rate /12. Zero-rate payment is principal/months. Fee funding determines principal; annualized cash-flow cost is a separate estimate.
Compare equal net funding before ranking financing cost. Different cash received is not a saving. The DTI worksheet includes this payment once and uses gross income; it does not measure take-home budget or approve credit.
The Real Cost of Origination Fees
Deducted fees reduce net proceeds without reducing face debt. A financed gross-based percentage uses face = requested cash/(1−fee); a requested-cash base uses cash×(1+fee). Dollar fees are explicit.
The fee-inclusive nominal annual estimate is monthly cash-flow IRR ×12; effective annual yield is (1+monthly IRR)^12−1. Neither is certified legal APR. Financing cost equals all payments minus net cash received.
When a Personal Loan Makes Sense
Compare equal net funding before ranking financing cost. Different cash received is not a saving. The DTI worksheet includes this payment once and uses gross income; it does not measure take-home budget or approve credit.
Deducted fees reduce net proceeds without reducing face debt. A financed gross-based percentage uses face = requested cash/(1−fee); a requested-cash base uses cash×(1+fee). Dollar fees are explicit.
How Credit Score Affects Your Rate
Rate presets are numerical illustrations, not current offers or credit-score predictions. Enter the actual contractual note rate and fee receipt, then verify lender terms, daily accrual, rounding and any prepayment charges.
Enter the nominal contractual note rate; the monthly rate is annual rate /12. Zero-rate payment is principal/months. Fee funding determines principal; annualized cash-flow cost is a separate estimate.