Euribor mortgage calculator

Euribor is the rate at which euro-area banks lend to each other for a fixed term, published every TARGET2 business day by the European Money Markets Institute. This site republishes the Bank of Finland's copy of the fixings with a 24-hour delay, which is why the newest date is usually yesterday's.

Variable-rate mortgages across Europe are priced as this fixing plus a fixed spread. When the fixing moves, the payment moves at the next revision date written in the loan contract, and the direction that matters to a borrower is simple: up.

Every number on this page is a published fixing, not an estimate: daily values come from the Bank of Finland's copy of the Euribor series, monthly averages are the arithmetic mean of those fixings and are cross-checked against the ECB Data Portal, and the tables are rebuilt each business day after the previous day's fixing appears. Tenors use the ACT/360 convention. Where a monthly average differs from the ECB figure by more than a hundredth of a point the methodology page lists the case.

Most variable mortgages in the euro area are revised on the monthly average, not the daily value. A loan that resets in September on the 12-month Euribor plus 1 pp would pay 3.95 % for the coming period.

What the calculator does

The calculator answers one question: given the outstanding balance, the remaining term, the Euribor reference and the spread, what is the monthly instalment? It performs the same three steps a bank performs at a revision. It adds the spread to the reference to get the annual rate. It divides that rate by twelve to get a monthly rate. It then applies the annuity formula, which finds the constant monthly payment that repays the balance exactly over the remaining number of months at that monthly rate.

The reference is the newest fixing in the database, from 4 September 2026, for the maturity of the page: the 12-month rate on the main calculator page, and each of the five maturities on its own maturity page, which the links below the calculator lead to. The reference itself is not an input; the three fields you can change are the outstanding balance, the spread and the remaining term. If your contract uses a monthly average rather than a daily fixing, the month pages on this site give that figure; in ordinary months it lies close to the fixing. A table on the page also shows the instalment for a standard loan at several spreads across all five maturities. Everything runs in your browser; nothing you enter is sent anywhere.

Index plus spread

The rate the calculator applies is the reference plus the spread, nothing more. On the main calculator page, with the 12-month fixing of 4 September 2026 and a spread of one percentage point, the rate used is 3.108 % plus 1.00 point. The spread is the fixed part of your rate and is written in your contract; the reference is the variable part. Entering a spread of zero shows the effect of the reference alone.

Remaining term

The term to enter is the number of years still to run on the loan, not the original term. A shorter remaining term makes the instalment less sensitive to the rate, because a larger share of each payment is capital repayment; a longer remaining term makes it more sensitive. This is why the same change in Euribor costs a borrower in the first years of a thirty-year loan considerably more per month than a borrower with five years left.

What it does not model

The calculator is deliberately simple, and the simplifications matter:

• Rounding. Banks may round the reference, the total rate or the instalment to a set number of decimals, sometimes upwards. The calculator rounds only the displayed result.
• Floors and caps. A contract may treat a negative reference as zero, or limit how far the rate can rise. The calculator applies neither; enter the floored or capped rate yourself if one applies.
• Fees and insurance. Account fees, compulsory insurance and other charges added to the monthly debit are not included. The figure shown is principal and interest only.
• Partial repayments. If you have made or intend to make extra repayments, the balance and possibly the term change; enter the balance after the repayment.
• Conventions. Banks may compute interest on an ACT/360 or other day-count basis, or with a different compounding rule. The calculator uses a plain monthly rate of one twelfth of the annual rate.

The result is therefore an estimate of the interest effect, accurate to within a few euros of a bank's figure in ordinary cases, not a reproduction of your statement.

Reading the previous revision comparison

Beside the main result the calculator shows what the same loan would pay with the previous month's monthly average of the same maturity in place of the newest fixing, with that average shown in the label, and the difference between the two instalments per month. This isolates the effect of the change in Euribor from everything else: the balance, the term and the spread are held equal in both calculations. A positive difference means the reference has risen since the previous month's average and the instalment at the current fixing is higher; a negative difference means it has fallen. The monthly average is used for the comparison because it is the figure most revisions are based on, so the previous-month instalment is close to what a loan revised on that average would have paid, while the current instalment shows where the daily fixing has moved since.