Enter the amount borrowed, the interest rate and the term. You get the regular payment, the total interest and the full amortisation schedule, payment by payment, with totals for each year. Choose level payments (a repayment loan), equal capital repayments or interest-only, paid monthly, quarterly, every six months or yearly.
Enter the loan
Type the amount borrowed, the annual rate and the term in years and months. Mortgage offers quote a nominal annual rate, which is divided by 12 for each monthly payment. If you only have an APR, as with most personal loans, choose ‘APR’: the calculator turns it into a monthly rate by compounding, which is exact for a loan with no fees.
Choose how the loan is repaid
With level payments, every payment is the same: early payments are mostly interest, later ones mostly capital. With equal capital repayments, you repay the same amount of capital each time, so payments start higher and fall. With interest-only, you pay the interest each time and the whole capital at the end.
Read and export the schedule
Each row shows the payment, the interest in it, the capital repaid and the balance still owed. Add the date of the first payment to date each row and to group the yearly totals by tax year, from 6 April to 5 April, which is the same across the UK. Export the schedule as a CSV file to open it in a spreadsheet.
Rate per payment: r = annual rate ÷ 12 for monthly payments (from an APR: r = (1 + APR)^(1/12) − 1).
Level payment = P × r ÷ (1 − (1 + r)^−n), where P is the amount borrowed and n the number of payments.
Each period: interest = balance owed × r, and capital repaid = payment − interest.
Amounts are rounded to the nearest penny, with halves rounded up; the last payment clears the balance, so it absorbs the rounding.
Example: £130,000 over 25 years
This is the Bank of England’s own example. At 2.5% the monthly rate is 2.5% ÷ 12, about 0.208333%, and the monthly payment is £583.20, which the Bank rounds to £583. In the first month, interest is £130,000.00 × 0.208333% = £270.83 and £312.37 of capital is repaid. Over the 25 years you pay £44,960.78 of interest. At 3.5% the payment rises to £650.81 (the Bank’s £651) and the interest to £65,243.22.