Compound Wealth Simulator

Compound Interest Calculator helps you visualize long-term investments with realistic, inflation-adjusted projections.
Reverse-calculate from your savings goal, set independent contribution and growth periods, and plan with confidence for FIRE, retirement, or
any long-term financial milestone.

■ Who this is for
- Anyone planning long-term investments (IRA, Roth IRA, 401(k), ISA, NISA, iDeCo)
- The FIRE community
- Retirement planners
- Goal-based savers
- Inflation-conscious investors

■ 3 Calculation Modes
- Calculate — Future value from initial assets and contributions
- Reverse — Required monthly contribution to reach your goal
- Compare — 3 return scenarios side by side

■ Independent Contribution Period
Set your contribution years separately from your overall growth period (e.g. contribute for the first 10 years of a 30-year horizon, then
let the balance compound). The chart highlights when contributions stop with a visual marker.

■ "Time to Goal" Reverse Calculation
Calculate how long it takes to reach your target as "X years Y months." Just enter your monthly contribution and assumed return rate.

■ Inflation-Aware
Display both nominal and real (purchasing-power) returns. Especially useful for users in high-inflation economies who want to understand the
true future value of their savings.

■ 23 Currencies, 7 Languages
Major world currencies including USD, EUR, GBP, JPY, CNY, KRW, INR, BRL, MXN, TRY. UI in English, Japanese, Chinese, Korean, Hindi, Spanish,
and Portuguese.

■ Locale-Aware Number Formatting
- Japan / China — 万, 億, 兆
- India — Lakh, Crore
- English-speaking — K, M, B, T
Numbers display in the format locals naturally read.

■ Privacy & Ads
- All calculations happen on-device. Your input data is never sent to our servers.
- This app is free, supported by in-app advertising.

■ Technical
- iOS 15.6 or later
- iPhone only

■ Disclaimer
Calculations are simulations and do not guarantee future investment performance or inflation rates. Investment decisions are your own
responsibility.