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# New Mortgage Calculator: See What Your Mortgage Really Costs
- URL: https://wisener.net/new-mortgage-calculator-see-what-your-mortgage-really-costs/
- Published: 2025-09-04T23:00:00.000Z
- Updated: 2026-10-12T18:27:27.000Z
- Description: Use our free Mortgage Calculator to quickly estimate monthly repayments or interest-only costs. Adjust amount, term, and rate to see total payments, balance charts, and stress test scenarios.
- Author: Lee Wisener
- Tags: calculator, Mortgage, #Import 2026-10-12 18:55

Mortgages are like flat-pack furniture instructions, simple at first glance, but the details can leave you scratching your head. That’s why I’ve added a **new mortgage calculator** to the site. It’s built to show you the numbers in plain English (well, plain pounds).

## **What it does**

- **Repayment basis**: Tells you your monthly and annual payments, total repaid over the term, and shows how your balance reduces to zero.
- **Interest-only basis**: Shows what you’d pay each month in interest, how much that adds up to over the years, and how the balance never actually goes away (the elephant in the room).
- **Stress test**: Because lenders love to add a “what if” scenario, the calculator also shows what happens if rates rise by a standard stress rate. That means you’ll see what the bank thinks you can afford, not just what you want to afford.

## **Why it’s useful**

Instead of fiddling with a spreadsheet (though I do love a good spreadsheet), you get the results instantly:

- Monthly cost at today’s rate
- Total over the life of the mortgage
- A chart that makes it painfully obvious whether your debt is shrinking or just hanging around

## **A note of caution**

This is **for illustration only**. It doesn’t replace advice or a lender’s official calculation. It won’t predict interest rate changes, or whether the Bank of England Governor is having a bad day. But it’s a solid starting point if you’re house-hunting or just curious about what a mortgage will cost.

👉 [Try the Mortgage Calculator here](../../mortgage-calculator)