Loan Payment Calculator

Before taking on a loan, it helps to know three numbers: the monthly payment, the total amount you would repay, and the total interest you would pay. This loan payment calculator estimates all three from the loan amount, annual interest rate, and term.

Use By Years or By Months for a standard repayment estimate, Borrow Limit to work backwards from the monthly payment you can afford, or 0% Interest for interest-free repayment plans.

This calculator does not include lender fees, insurance, taxes, or a full payment-by-payment schedule. For APR with upfront fees, use the APR Calculator. For a full principal-versus-interest schedule, use the Amortisation Calculator.

A GBP 12,000 loan over five years at an 8% annual interest rate has a lower monthly payment than the same loan over three years, but the longer term usually means more total interest. The calculator shows both the monthly commitment and the full repayment cost.

This is useful because the cheapest monthly payment is not always the cheapest loan. A payment that fits the budget can still be expensive if the term is stretched too far.

Loan decisions affect cash flow for months or years. Looking only at the monthly payment can hide the interest cost and the opportunity cost of committing income to debt.

A good loan is not only affordable today. It should still be manageable if income changes, expenses rise, or another financial priority appears.

Compare rates, check fees separately, avoid borrowing more than needed, and choose the shortest term that remains comfortable. If possible, leave room in the budget for savings and emergency costs after the payment is made.

Before applying, test the payment in your monthly budget. If the loan only works by removing all spare cash, it may be worth reducing the amount or waiting.

Loan payment maths is sensitive to rate, term, and whether the payment is truly fixed. A longer term can lower the monthly payment while increasing total interest materially.

Compare monthly affordability with lifetime cost — a payment that fits today may still be expensive over the full term if the rate or fees are high.

Use the result to prepare better questions for lenders: early repayment rules, fee structures, variable-rate triggers, and whether any fees should be added to the amount borrowed.

Run a cautious scenario with a slightly higher rate or shorter income buffer before treating the maximum borrowable amount as safe.

Choosing the longest term simply because the monthly payment is lowest, without checking total interest and flexibility.

Forgetting that arrangement fees, broker costs, compulsory insurance, or early repayment penalties are not included unless you add them separately outside this calculator.

Borrowing the maximum approved amount without leaving room for rate rises, job changes, or emergency savings.

Start with the payment estimate here, then open apr if upfront fees matter, loan if you want max-loan or implied-rate modes, or amortisation for a payment-by-payment schedule.

Reuse the same loan amount, annual rate, and term across tools on the same day so comparisons stay fair.

If two tools disagree, check whether one includes fees, payment frequency, rounding, or a full amortisation schedule that the other omits.

Rerun the calculator when the rate, term, amount borrowed, or monthly budget changes.

For fixed-rate deals, review again when the fixed period ends. For variable-rate borrowing, review when the lender changes the rate.

Keep a note of the assumptions you used so you can tell later whether the plan changed because of maths or because circumstances moved.