How to calculate your net worth: a UK guide
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Your net worth is the single clearest measure of your financial position: everything you own minus everything you owe, expressed as one number. To calculate it, add up the current market value of your assets, which in the UK usually means property, cash and savings, Stocks and Shares ISAs, general investment accounts, workplace and personal pensions, and anything else substantial such as a car or crypto. Then add up your liabilities: the outstanding mortgage balance, personal loans, car finance, and credit card and overdraft balances. Subtract the second total from the first and the result is your net worth. Use today's values rather than what you originally paid, and use the same method every time so the figures stay comparable. Calculate it once and you have a baseline. Calculate it monthly and you have something far more useful: an honest answer to whether you are actually growing.
The net worth formula
The formula is simple:
Net worth = total assets − total liabilities
Assets are what you own. Liabilities are what you owe. Subtract the second from the first and the result is your net worth. It can be positive or negative, and both are normal at different stages of life.
Step 1: Add up your assets
An asset is anything you own that has a monetary value. For most people in the UK that includes:
- Property: your home and any other property, valued at what it would realistically sell for today (not what you paid).
- Cash and savings: current accounts, savings accounts, Premium Bonds, and cash ISAs.
- Investments: Stocks and Shares ISAs, general investment accounts (GIAs), shares and funds.
- Pensions: workplace and personal pensions. For a defined contribution pension, use the current pot value. A defined benefit (final salary) pension has no simple pot value, so many people leave it out or record its transfer value separately.
- Other assets: vehicles, crypto, and valuables such as jewellery, if they are worth enough to matter.
Use current market values throughout. The goal is an honest snapshot of today, not a record of what things once cost.
Step 2: Add up your liabilities
A liability is anything you owe. In the UK this usually means:
- Mortgage: the outstanding balance, not the original loan.
- Loans: personal loans, car finance, and Buy Now Pay Later balances.
- Credit cards and overdrafts: the current balance you owe.
- Student loan: optional. UK student loans are repaid as a percentage of income above a threshold and are written off after a set period, so they behave differently from ordinary debt. Some people include the balance, others track it separately.
Step 3: Subtract one from the other
Here is a worked example for a typical UK household:
| Item | Value |
|---|---|
| Home (current market value) | £310,000 |
| Cash and savings | £14,500 |
| Stocks & Shares ISA | £28,200 |
| Pension (DC pot value) | £63,000 |
| Car | £9,000 |
| Total assets | £424,700 |
| Mortgage (outstanding) | −£182,000 |
| Car finance | −£6,400 |
| Credit cards | −£1,900 |
| Total liabilities | −£190,300 |
| Net worth | £234,400 |
Common mistakes to avoid
- Using the purchase price instead of today's value, especially for property and cars.
- Forgetting pensions, which are often one of the largest assets a UK household has.
- Double-counting: if your mortgage is listed as a liability, count the home's full value as the asset, not just the equity.
- Doing it once and never again. A single number is a snapshot; the trend over time is where the insight is.
How often should you update it?
Once a month is plenty. Net worth moves slowly, so monthly updates reveal a clear trend without becoming a chore. The important thing is consistency: same kinds of values, on a regular schedule.
Track it automatically with PecuIQ
Doing this by hand in a spreadsheet works, but it is easy to let it slip. PecuIQ is a free, UK-native net worth tracker that does the maths for you: add your assets and liabilities once, update a value in seconds, and watch the trend build over time. It works on the web today, stores your data in a private account that syncs across your devices, and never asks for a bank login.
Next: What is a good net worth in the UK?, and how to make sense of your number once you have it.
PecuIQ is a personal net worth tracking tool, not a financial adviser. This guide is general information, not financial, investment, or tax advice. Always do your own research or speak to a qualified adviser before making financial decisions.