How to Use This Mortgage Calculator

Enter the loan amount, which is the purchase price of the home minus your own down payment. Add the annual interest rate your bank has offered, or a typical market rate to compare scenarios. Set the loan term; 20 to 30 years is common in the Nordic countries. Click Calculate to see the monthly payment, the total amount you will repay and how much of it is interest.

The calculator uses the standard annuity formula: M = P × r(1 + r)ⁿ ÷ [(1 + r)ⁿ − 1], where P is the loan amount, r is the monthly interest rate and n is the number of monthly payments. This is the same formula banks use for annuity loans, where the monthly payment stays the same as long as the interest rate does not change.

Understanding Mortgage Payments

Every payment covers two things: principal, the part that reduces your debt, and interest, the bank's charge for lending you the money. At the start most of each payment is interest, because the debt is at its largest. As the debt falls, the interest share shrinks and the principal share grows.

On a €200,000 mortgage at 4.5% over 25 years, the monthly payment is about €1,112. In the first month about €750 is interest and only €362 reduces the debt. After roughly ten years, more of each payment goes to principal than to interest, and in the final years almost all of it does. This is why extra repayments early in the loan save the most interest.

What Affects the Monthly Payment?

The interest rate has the largest effect on the total cost. On a €250,000 mortgage over 25 years, a rate of 5% instead of 3.5% costs about €63,000 more in interest. Even half a percentage point adds up over two or three decades, so it pays to compare banks and negotiate the margin.

The loan term sets the size of the monthly payment. A longer term gives lower payments but more interest in total: on a €200,000 loan at 4%, a 30-year term costs about €53,000 more interest than a 20-year term. Choosing the shortest term you can comfortably afford is usually the better financial decision.

The loan amount depends on the price and your down payment. A larger down payment reduces the loan and the monthly payment, and can also get you a better margin.

Variable and Fixed Interest Rates

In Finland most mortgages have a variable rate tied to the 12-month Euribor plus the bank's margin, and in Sweden many households choose a variable rate tied to the three-month rate. When market rates fall your payment falls, and when they rise it rises. You can test this by recalculating with a rate one or two percentage points higher.

A fixed rate stays the same for an agreed period, often from one to ten years, which makes budgeting predictable. In Finland a similar protection is available as an interest rate cap or a fixed-rate period on a Euribor loan. Fixed rates usually cost a little more at the start, in return for certainty.

Frequently Asked Questions

Does the result include housing costs or insurance?

No, it shows only principal and interest. Your real monthly housing cost also includes home insurance, maintenance charges in a housing company (yhtiövastike in Finland, avgift in a Swedish housing cooperative), property tax and running costs. Budget for these separately.

How large a down payment do I need?

Each country limits how much of the price you can borrow. In 2026 the cap is 95% of the purchase price in Finland, after a temporary easing, and 90% in Sweden, from April 2026. The rules change from time to time, so check the current cap with your bank. A larger down payment always reduces the loan and the interest you pay.

Can I pay off my mortgage faster?

Usually yes. Variable-rate loans can normally be repaid early at little or no cost. For fixed-rate loans, the bank may charge compensation for lost interest if you repay during the fixed period. Even small regular extra payments can shorten the loan by years and save a lot of interest.

What is the loan-to-value ratio?

The loan-to-value ratio (LTV) is the loan divided by the value of the home. A €160,000 loan on a €200,000 home is 80% LTV. A lower LTV means less risk for the bank and can help you get a better margin. As you repay the loan and the home's value rises, the LTV falls.

Tips for a Better Mortgage

Compare offers from several banks and ask them to lower the margin. Pay down expensive consumer debt before you apply. Save the largest down payment you reasonably can. And test your budget at a rate two or three percentage points above today's, so you know you can still pay if rates rise.