The formula is trivial. The inputs are not.
Add up what you own. Subtract what you owe. Done.
Except almost nobody gets a useful number on the first attempt, and the reason is not arithmetic. Valuing your own possessions honestly is uncomfortable, and there are two failure modes.
Some people inflate. The car is worth what they paid, the furniture counts, the watch is an investment. Others deflate, leaving out a pension because it feels imaginary, which is often the largest single thing they own.
A net worth figure is only useful if you would be willing to show it to someone who knows your finances. Anything else is a mood.
What counts, and at what number
Cash and savings are the easy ones. The balance is the value.
Investments are worth today's market value, not what you paid and not what you hope. If you hold something illiquid, note that selling takes time and may cost you.
Retirement accounts count in full, and this is where people most often go wrong by leaving them out entirely. A 401(k), an IRA, a workplace pension: these are yours. If you want to be precise, an account holding pre-tax money is worth less than its balance because tax is owed on withdrawal, but do not use that as an excuse to score it at zero.
Property is worth what it would sell for, minus what selling costs. Agent commission, legal fees and the repairs a buyer will demand routinely come to 7 to 10% of the price. A house you would list at $400,000 does not put $400,000 into your net worth.
Vehicles depreciate faster than almost anyone's mental model. A new car loses a substantial share of its value the moment it is registered, and continues at a slower rate for years afterwards. Look up your actual model rather than guessing, or run it through the car depreciation calculator, which will at least stop you carrying a five year old car at its purchase price.
Everything else should mostly be left out. Furniture, clothes, the television, the contents of the garage. In theory they have resale value. In practice you will never sell them, and including them adds noise to a number whose whole purpose is to be comparable with itself next year.
The exception is anything genuinely worth serious money and genuinely sellable: a second vehicle, jewellery with a real market, a collection you actually have offers for.
The debts people forget
Mortgage and car loan balances come to mind immediately. Several others do not.
Credit card balances count at what you owe today, not the minimum payment. Student loans count in full, including any deferred interest that has been capitalised. Tax owed but not yet paid is a debt: if you are self employed and have a bill coming in April, it belongs in the figure from the day it is incurred.
Buy now pay later arrangements are debt. So is money borrowed from family, whether or not there is paperwork. So is a personal guarantee on a business loan, which is invisible on a personal balance sheet right up until the day it is not.
Add them all. The number gets worse and the picture gets accurate, which is the trade you are making.
The number is meaningless. The direction is not.
Once you have a figure, the temptation is to compare it with a national average. I would spend the effort elsewhere.
The Federal Reserve's Survey of Consumer Finances is the source behind those comparisons, and it is worth reading if you are curious, because it reveals how misleading the averages are. Mean net worth is dragged violently upward by the very wealthy, so it sits far above the median. Comparing yourself to a mean puts you below a figure almost nobody reaches.
Age is the other reason comparison misfires. A thirty year old with a negative net worth from a professional degree and a forty five year old with the same number are in entirely different situations, and no single figure separates them.
What is worth tracking is your own direction. Same method, same day each quarter, same treatment of the car and the house. The trend line answers questions the absolute number cannot: is debt actually falling, is the mortgage moving, did a good year in the market flatter a year in which you saved nothing.
Negative is a stage, not a verdict
Plenty of people run a negative net worth, and a large share of them are doing fine.
A recent graduate with student loans and no assets is negative by design. Someone who just bought a house with a small deposit is close to zero, because the mortgage almost matches the equity. Neither is in trouble.
The distinction that matters is what the debt is attached to. Debt against an appreciating asset, or against earning power, behaves differently from debt against a holiday. If the negative figure comes mostly from high interest consumer debt, that is the thing to work on first, and the debt payoff planner will show you what order costs least.
Retirement changes the question again. At that point you stop caring what the total is and start caring what it produces per month, which is a different calculation entirely and the one the retirement income calculator is built for.
How I would actually do it
Open one page. List every account with a balance, every asset over a few thousand in value, and every debt. Use today's figures, not remembered ones.
Value the house at a realistic sale price minus selling costs. Value the car from an actual depreciation figure. Leave the furniture out.
Total it in the net worth calculator, write the date next to it, and put a reminder in three months.
The first number will probably be lower than you expected. The second one is the one that tells you anything.
Questions people ask
Total everything you own at its realistic current value, then subtract every debt you owe today. Value property at its likely sale price minus 7 to 10% in selling costs, value a car from actual depreciation rather than what you paid, and leave household possessions out unless they are genuinely worth selling.
Yes, in full. It is the single most commonly omitted asset and often the largest one a person holds. If you want precision, a pre-tax account is worth somewhat less than its balance because tax is due on withdrawal, but treating it as zero is far more wrong than treating it at face value.
The equity does, meaning the sale price minus the mortgage. Subtract selling costs too, since agent commission, legal fees and buyer-demanded repairs typically run 7 to 10% of the price. A home you would list at $400,000 with a $250,000 mortgage contributes closer to $120,000 than $150,000.
Not by itself. New graduates with student loans and recent buyers with small deposits are routinely negative and doing fine. What matters is what the debt is attached to: borrowing against earning power or an appreciating asset is a different situation from high interest consumer debt, which is where to focus first.
Quarterly is plenty, and consistency matters more than frequency. Use the same method and the same valuation rules every time, because the useful signal is the direction of travel rather than any single figure. Monthly tends to make market noise feel like progress or failure.
Be careful with that question. The Federal Reserve's Survey of Consumer Finances is the underlying source for most comparisons, and it shows mean net worth sitting far above the median because the very wealthy pull the average up. Comparing against a mean puts you below a figure most people never reach, and age differences make the comparison shakier still.
