People who track their net worth make measurably different decisions with money. Drag the sliders, spin the 3D model, and see exactly how the single most important personal-finance number is built.
Net worth = everything you own − everything you owe. Assets include cash, brokerage and retirement accounts, and home equity (market value minus mortgage). Liabilities include credit cards, car loans, and student debt. Income is not net worth — a $200k earner who spends $210k has a shrinking one.
Maya, 31, tallies her position:
| Checking + emergency fund | $18,000 |
| 401(k) + index funds | $52,000 |
| Condo equity | $35,000 |
| Student loans | −$27,000 |
| Credit card | −$3,000 |
| Net worth | $75,000 |
Research on self-monitoring (the same effect behind food diaries and step counters) shows that simply measuring a number monthly makes people optimize it. A $400 impulse buy stops being abstract when you watch it subtract from a chart. Reviewing net worth monthly turns money from a feeling into a system — respect for money starts with measuring it.
A common rule of thumb: target net worth ≈ age × pre-tax income ÷ 10 (from “The Millionaire Next Door”). A 30-year-old earning $70,000 would target ~$210,000. Most people are below this early in their careers — the point isn't the number, it's that the trendline points up. Update yours monthly, on the same day, and compare only against last month's you.