What Net Worth Is — And Why It Matters
Net worth is the dollar value of everything you own (assets) minus everything you owe (liabilities). It's the single most important number in personal finance — more important than income, more important than savings rate, more important than your credit score. Income tells you what's coming in; net worth tells you what's accumulating.
The Microapp Net Worth Calculator handles the math privately in your browser. Nothing gets uploaded, stored, or transmitted. Enter your numbers, see your net worth, close the tab — done.
• Cash + savings: $25,000
• Investments + retirement: $80,000
• Home value: $400,000
• Car: $15,000
• Total assets: $520,000
Liabilities:
• Mortgage balance: $300,000
• Auto loan: $8,000
• Credit cards: $3,000
• Student loans: $20,000
• Total liabilities: $331,000
Net worth: $189,000
The Stanley-Danko Benchmark
From The Millionaire Next Door (1996, still widely cited): your expected net worth at any age = (age × pre-tax annual income) / 10. The book calls people above this number Prodigious Accumulators of Wealth (PAW); below, Under-Accumulators (UAW).
| Age | Income | Expected net worth (S&D) |
|---|---|---|
| 30 | $60k | $180k |
| 30 | $100k | $300k |
| 40 | $80k | $320k |
| 40 | $150k | $600k |
| 50 | $100k | $500k |
| 50 | $200k | $1.0M |
| 60 | $120k | $720k |
The formula breaks for early-career people (a 25-year-old earning $80k can't be expected to have $200k yet — they haven't worked long enough), and for people who recently changed careers or had significant life events. Use it as a directional check, not a rigid target.
Asset Categories — How to Value Each
Cash, checking, savings. Use current account balances. No estimation needed.
Investments (taxable brokerage). Current market value of stocks, bonds, ETFs, mutual funds. Most brokers display this on their dashboard.
Retirement accounts (401k, IRA, Roth IRA). Current balance. For pre-tax accounts, some people deduct an estimated future tax liability (typically 20-30%) — this gives a more conservative "after-tax" net worth. Either approach is valid; pick one and stay consistent.
Real estate (home). Current market value, NOT what you paid. Use Zillow, Redfin, or a recent appraisal as a starting point, then adjust if you know your local market is hot or cold relative to algorithms.
Vehicles. Current resale value (Kelley Blue Book private-party value). Cars depreciate fast — a $40k new car is often worth $25k after 3 years and $15k after 7. Updating this annually keeps net worth realistic.
Other assets. Collectibles, jewelry, business ownership stake, accounts receivable. Be conservative — only count things you could actually sell within 6 months.
Liability Categories — What Counts
Mortgage balance. Current principal owed (NOT total payments remaining). Your loan statement shows this.
Auto loans. Current principal owed.
Credit card balances. What's currently owed across all cards (regardless of statement cycle). If you pay in full every month, this should be zero or close to it.
Student loans. Total balance across all federal and private student loans.
Personal loans. Lender-issued installment loans not in the above categories.
Other debts. Medical bills in collections, owed money to family/friends, tax debts. Anything you'd need to pay if you closed out today.
Why Track Quarterly
Net worth fluctuates daily because investment values move. Tracking too often (weekly) creates anxiety and noise. Tracking too rarely (annually) misses inflection points where you should adjust strategy. Quarterly is the consensus sweet spot — frequent enough to spot trends, rare enough to filter market noise.
The trend matters more than the absolute number. A flat or declining net worth quarter-over-quarter (excluding market downturns) is a signal to look at savings rate, debt repayment, and large discretionary expenses. A consistently growing net worth means your financial system is working.
Common Pitfalls
Counting income or future earnings. Net worth is a snapshot of right-now value. Your career earning potential is real but doesn't count until you've actually saved/invested/repaid debt with it.
Not deducting purchase costs. If you bought a car for $30k, financed $25k, and paid $5k cash — the asset is the car's CURRENT VALUE (not $30k), and the liability is the loan BALANCE (not $25k). Both depreciate / amortize over time.
Including or excluding home equity inconsistently. If you list home value as an asset, you must list mortgage as a liability. The net (home equity) is what counts. Some people exclude home entirely as a "primary residence shouldn't count" choice — that's a more conservative approach common in FIRE/early-retirement contexts.
Forgetting to update. Stale numbers (last year's home value, last year's loan balances) make the calculation meaningless. Update at least quarterly; better, set a calendar reminder.
Privacy Note
The values you enter into this calculator never leave your browser. We don't have a server-side database for personal-finance inputs. We don't track them in analytics. We don't store them in localStorage or cookies (the form clears on page refresh). Use the calculator from a coffee shop, a shared computer, anywhere — your numbers stay private.
This is a deliberate design choice. Personal-finance numbers are sensitive. We don't think a free utility tool needs your data, so we don't take it.
Related Tools
For projecting retirement savings growth specifically (a major component of net worth), use the Roth IRA Calculator. For modeling investment compound growth over time, the Compound Interest Calculator handles that. For loan amortization (mortgage, auto, personal), see the Loan Calculator.