Net Worth Calculator

About Net Worth Calculator

How the Net Worth Formula Works

The formula is Net Worth = Total Assets - Total Liabilities. Everything else is a judgement call about what to include and how to value it.

Worked example: A UK household in their late thirties might own a £5,000 current account balance, £12,000 in savings, a £28,000 stocks and shares ISA, £45,000 in workplace pension, a £280,000 home, and an £8,000 car. Total assets: £378,000. Against that, they owe £195,000 on the mortgage, £18,000 on a student loan, and £2,500 on a credit card. Total liabilities: £215,500. Net worth is £378,000 - £215,500 = £162,500.

Assets	Value
Current account	£5,000
Savings	£12,000
Stocks and shares ISA	£28,000
Pension	£45,000
Home (market value)	£280,000
Car	£8,000
Total Assets	£378,000

Liabilities	Balance
Mortgage	£195,000
Student loan	£18,000
Credit card	£2,500
Total Liabilities	£215,500

Net Worth: £378,000 - £215,500 = £162,500

What to Include as Assets and Liabilities

Count every asset at its current market value, not what you originally paid. Count every liability at its current outstanding balance, not the original loan amount.

Assets:

• Cash: current accounts, savings accounts, cash ISAs, emergency fund
• Investments: stocks, bonds, mutual funds, stocks and shares ISAs, crypto
• Retirement: workplace pension, SIPP, 401(k), IRA
• Property: home, rental property, land (current estimated value)
• Vehicles: cars, motorcycles (use trade-in value, not the price you paid)
• Other: business ownership, valuable collectibles, precious metals

Liabilities:

• Mortgage balance remaining
• Car finance or lease balance
• Student loans
• Credit card balances
• Personal loans
• Buy now pay later balances
• Money owed to family or friends

In the UK, net property wealth makes up about 40% of total household wealth and private pension wealth another 35%, per the ONS - so these two categories typically dominate the picture. If you only track cash and brushed-aside a pension pot, you are understating your position by a lot.

What Is a Good Net Worth for My Age?

Median wealth grows steadily with age and then flattens or declines in retirement. The ONS reports that median household wealth in Great Britain ranges from £15,200 for households headed by someone aged 16-24 to a peak of £502,500 at 65-74, a 33-fold gap driven mostly by property and pension accumulation. US figures from the Federal Reserve's 2022 SCF show a similar curve, with under-35s at a median of $39,000 and the overall median at $192,700.

Age Group	UK Median Household Wealth	US Median Household Net Worth	Context
16-24	£15,200	~$39,000 (under 35)	Early career, often negative equity from student loans
25-34	£69,800	~$39,000	Building foundations, possibly first mortgage
35-44	£200,700	$135,600	Peak earning years starting
45-54	£380,900	$247,200	Home equity and pension building
55-64	£457,800	$364,500	Pre-retirement peak
65-74	£502,500	$409,900	Retirement peak, property often paid off
75+	£347,400	$335,600	Drawdown phase

Sources: ONS Household total wealth in Great Britain (April 2020-March 2022, published January 2025) and US Federal Reserve Survey of Consumer Finances 2022. Note that the ONS has suspended accreditation of the Wealth and Assets Survey from Round 8 pending quality improvements, so UK figures should be treated as directional rather than exact. The next US SCF update is expected in late 2026.

Home equity often dominates the UK picture because property values are high relative to incomes. Net worth excluding the primary home gives a clearer read on liquid or investable wealth, which is what matters for retirement drawdown and financial flexibility.

Common Mistakes When Calculating Net Worth

Most net worth errors come from valuing things optimistically or forgetting liabilities entirely. Run this list before you trust the number.

• Overvaluing your home: Use a realistic current market estimate based on recent comparable sales, not what you hope it is worth or the best-case Zoopla or Zillow number. UK Land Registry sold-price data and US county assessor records are better anchors.
• Overvaluing vehicles: Cars depreciate fast. A 3-year-old car is typically worth 40-50% of its new price, and new cars lose about 20% of value in year one per industry depreciation data. Use trade-in value, not private sale optimism.
• Forgetting liabilities: Buy now pay later balances, owed taxes, informal debts to family, and outstanding medical bills all count. UK Klarna and Clearpay balances are a common blind spot.
• Including income-generating ability: Your future earnings are not an asset. Net worth is a snapshot of what you have now, not what you will earn. Lifetime earning potential is a separate concept (human capital) and does not belong on the balance sheet.
• Counting personal items at purchase price: Furniture, clothing, and electronics are not worth including unless they have significant resale value. A £2,000 sofa is worth maybe £200 secondhand after a year.
• Double-counting pension tax: UK defined contribution pensions will be taxed on withdrawal above the 25% tax-free amount. The gross balance overstates your usable wealth by 15-30% depending on your retirement tax band.

How Often Should I Recalculate Net Worth?

Most financial planners suggest updating net worth quarterly or twice a year. That cadence catches meaningful changes without getting whiplashed by short-term market swings. Tracking monthly can feel productive but mostly measures noise from equity markets and crypto prices rather than genuine progress. Pick a fixed day (such as the end of each quarter) and stick to it so the comparisons stay consistent. A running log over 5-10 years is vastly more useful than any single snapshot.

Three Ways to Grow Net Worth

Net worth only moves for three reasons: you added to your assets, you paid down your liabilities, or your existing assets appreciated. Most compounding happens through the third channel, but the first two are what you control directly.

1. Increase assets: Save more, invest in diversified index funds, maximise workplace pension matching, fill your ISA or Roth IRA allowances
2. Decrease liabilities: Pay down high-interest debt first (credit cards typically 20-30% APR dwarf any investment return), avoid new consumer debt, refinance at lower rates when available
3. Let appreciating assets compound: UK property has averaged around 4-5% nominal annual growth long-term per Nationwide House Price Index data, and global equities have returned around 7% real per Credit Suisse long-run data. Time in the market beats timing the market.

To project how invested assets might grow, the investment return calculator models compound returns under different rates. For working backwards from a target, the savings goal calculator shows the monthly contribution needed, and the loan calculator helps compare debt payoff scenarios.

Sources

• ONS - Household Total Wealth in Great Britain (Apr 2020-Mar 2022)
• Federal Reserve - Survey of Consumer Finances
• Federal Reserve - SCF Interactive Chart by Age
• ONS - Wealth and Assets Survey Methodology Guide
• Nationwide House Price Index
• HM Land Registry - UK Sold Property Prices

This tool is for personal tracking only and does not constitute financial advice. All calculations run in your browser. Nothing is stored or sent anywhere.