Free tool

Prota Compound Interest Calculator

Project your wealth forward — or work backward from a target to find the monthly contribution, time, or return you actually need.

Initial investment

Periodic contribution

Interest rate

Investment period

Contribution timing

Currency

These refine the projection — fee and tax use standard simplifications, not tax advice.

Annual inflation

Annual contribution increase

Management fee (annual)

Tax on investment gains

One-time extra contribution

Amount, and the month number it happens.

Reinvest returns (compounding)

Final balance

—

Amount contributed

—

Investment returns

—

Real purchasing power

—

In today's money, after inflation

Return / contributions

—

Wealth over time

Contributions vs. investment returns, year by year.

Contributions Investment returns

Year-by-year breakdown

Year	Contributions	Interest	Balance

Educational tool only — not investment advice. Fee and tax figures are simplified approximations; real products have specific rules that can change your result.