8 free calculators for the life-scale decisions — housing, career, savings, and net worth — where a 1% difference compounds into years.
Habit and debt calculators deal with small, frequent numbers. This hub deals with the opposite: decisions you make rarely — sometimes once — but that are large enough to reshape your entire financial trajectory. Renting vs. buying, the size of the home you buy, your salary, and how much cash sits in a low-yield account are exactly the kind of decisions where "eyeballing it" leads people astray.
The Consumer Financial Protection Bureau's homeownership resources note that the ongoing costs of owning a home — taxes, insurance, maintenance, utilities — typically run 1-4% of the home's value every year, on top of the mortgage payment itself. Most affordability conversations focus only on the mortgage, missing this entirely.
On the income side, the FDIC and CFPB both point to emergency savings as the foundation that makes every other financial decision less risky. The calculators below connect these big, infrequent decisions to the same compounding logic used throughout this site.
| Calculator | What it answers | Best for |
|---|---|---|
| Rent vs Buy | Whether renting or buying wins financially for your numbers | Anyone choosing where to live next |
| True Cost of a Bigger House | The full annual carrying cost of upsizing | House-hunters comparing sizes |
| Luxury Car Opportunity Cost | What the price gap on a nicer car could become if invested | Anyone car-shopping |
| Salary Negotiation | Lifetime value of negotiating a higher starting salary | Job seekers and anyone changing roles |
| True Hourly Rate | Your real per-hour pay after commute, taxes, and work costs | Comparing job offers or freelance rates |
| Emergency Fund | How much you need saved for 3-6 months of expenses | Anyone without a safety net |
| How Long Will Savings Last | Runway your current savings provide at a given spend rate | Career breaks, layoffs, sabbaticals |
| Net Worth Target | What net worth you need by age for your goals | Long-term financial goal-setting |