Long-term planning
Compound Interest Calculator as proof.
A focused ShowMath proof page for compound growth. Show how visible math turns a planning calculator into something trustworthy and teachable.
Best sent when
Send this when someone needs a planning proof point that feels calmer and more universal than tax or pricing math.
Share route
/showmath/examples/compound-interest
Situation
A saver wants to see how a starting balance plus monthly contributions compounds over time.
Why this earns trust
People hear that compounding is powerful, but the trust comes from seeing how time, rate, and contribution cadence interact.
What becomes visible
- How the exponent changes the curve over time
- Why earlier contributions matter more than later ones
- What actually happens when you change the rate, years, or monthly deposit
Formula sketch
Other proof routes
Send the proof point that fits the moment.
Tax clarity
Self-Employment Tax Calculator
Send this when someone understands that contractor taxes are higher in theory but wants to see the exact math driving the gap.
Pricing confidence
Freelance Rate Calculator
Send this when someone needs to justify a quote, explain a rate increase, or defend why freelance math does not match salary math.