Understanding how your monthly payment is actually calculated helps you evaluate loan offers critically rather than just accepting the number a lender shows you. Here's the math behind it, and how to use it to your advantage.
The Amortization Formula
A fixed monthly payment is calculated as: principal × monthly interest rate, divided by 1 minus (1 + monthly interest rate) raised to the power of negative the number of months. It looks complex, but it's the same formula behind every fixed-rate installment loan.
Using Our Calculator
Rather than doing this math by hand, our loan calculator lets you adjust amount, term, and credit range to see your estimated payment, total interest, and total repayable instantly.
What the Numbers Tell You
Pay attention to all three figures — monthly payment, total interest, and total repayable — not just the payment. Two offers with the same payment can have very different total costs depending on the term.
Planning Your Budget Around It
Once you have an estimated payment, test it against your actual budget for a full month before applying, to confirm it's genuinely sustainable alongside your other expenses.