Compound Interest Calculator - Calc Invest - helps you plan investments with clarity and speed. Simulate compound interest, find out how much to invest to reach $1 million, and compare fixed income (CDB vs LCI vs LCA) to make safer decisions — all in a few taps.

What you can do

Road to $1 Million: enter rate and monthly contribution (or a target term) and see the path to $1M, with projections for time, total contributed, and wealth growth.

Fixed-income comparison: compare CDB, LCI, and LCA considering rate, income tax/tax-exempt status, term, and liquidity, highlighting net returns.

Compound interest: simulate with or without contributions, switch periods (month/year), and track the impact of time on growth.

Financial goals: calculate the contribution required to hit a target amount, or the time needed to reach it.

Retirement: project by target income or target wealth, showing how much to invest and for how long.

Side-by-side scenarios: compare different assumptions (rate, contribution, term) and quickly see which one makes more sense.

Clear charts and results: visualize balance vs. contributions over time, plus concise numeric summaries ready to share.

Why use it

Simple, fast, and straightforward interface

Transparent results focused on net return

Ideal both for beginners and for fixed-income investors

Helps answer everyday questions: “How much per month to reach my first million?”, “What term do I need?”, “Is a CDB at 120% better than an LCI/LCA at 90%?” and “How much would R$ 1,000.00 earn over 30 years?”