Free browser tool

Free Compound Interest & CAGR Calculator

Model a starting balance and monthly contributions at your assumed return. Free local calculator with yearly totals, no AI or price feed.

Quick answer

What compound interest & cagr calculator does

Regular contributions and compounding answer a different question from picking a future investment return. This calculator shows what follows mathematically from your chosen constant rate. It converts your effective annual CAGR into an equivalent monthly growth rate and adds contributions at each month’s end. The yearly table separates the amount you put in from the modeled balance and growth.

Compound interest calculator with monthly contributions and balance projections – KnowledgePilot.

How to use this tool

Enter a starting balance and the same monthly contribution for each month.
Choose a constant annual return assumption and a whole number of years.
Calculate yearly contributions and growth, then try other assumptions.

Worked example

At zero return, a starting balance of 1,000 and twelve monthly contributions of 100 end at 2,200. At a positive assumed rate the result is larger; at a negative assumed rate some contributions can lose value. Changing assumptions demonstrates sensitivity, not certainty.

What to check before using the result

Real returns vary and can be negative. A constant return omits the sequence of gains and losses, market timing, taxes, fees and inflation. The display uses numbers without assigning a currency; use the same units for every input. Historical prices are not loaded, and the result is not a return forecast or a recommendation to buy an asset. Not financial advice. Use your own assumed stock CAGR; this tool does not infer a stock’s future return.

Good to know

Frequently asked questions

Is this tool free and does it use AI?

It is free without an account. It uses fixed parsing rules, formatting or arithmetic in your browser, without AI or paid API calls. KnowledgePilot’s AI summarizers are separate products.

Does my text or file leave this device?

Inputs and document files are processed locally. This tool does not upload your text or files to KnowledgePilot. Optional saved drafts stay in your browser, so download a copy before clearing its data.

Can I rely on the result without checking it?

Review the worked example and limits above. The output follows the information you enter; it does not verify the source or supply missing facts. Check important details against the original material.

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