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Compound Interest Calculator

Calculate compound growth over time with monthly contributions and custom compounding frequencies.

Total Principal

$34,000.00

Total Interest Earned

$25,029.54

Future Portfolio Value

$59,029.54

Portfolio Growth Trajectory (Principal vs. Interest)

Future Value Principal Invested
Year 1 ➔ Year 10
Financial & Calculation Disclaimer

Burnjet provides calculators and educational tools for general informational purposes only. Results depend strictly on the mathematical assumptions you enter and do not guarantee future financial, stock market, or tax outcomes. This tool does not provide financial, investment, legal, or professional tax advice.

Quick Reference & Instructions

Simple steps, pro tips, and execution details

1

Enter Your Numbers

Type in your initial amounts, interest rates, or investment duration below.

2

Live Instant Calculation

Watch the charts, returns, and breakdown tables update immediately as you tweak numbers.

3

Copy or Plan Next Steps

Copy summary results or use the visual breakdown to make informed financial decisions.

How It Works

Compound interest accelerates wealth accumulation because returns generate their own returns. Enter your starting principal, expected annual interest rate, duration in years, and optional monthly deposits.

Formula & Logic

A=P(1+r/n)(nt)+PMT×[((1+r/n)(nt)−1)/(r/n)]A = P(1 + r/n)^(nt) + PMT × [((1 + r/n)^(nt) - 1) / (r/n)]
Example: Starting with $10,000 at 8% annual return with $200 monthly contributions for 10 years results in $58,359 ($34,000 principal + $24,359 interest).

Frequently Asked Questions

Common questions about calculations, assumptions, and edge cases.

The more frequently interest is compounded (e.g. monthly vs annually), the faster your money grows, as interest is added to your principal more often.

In-Depth Guides & Tutorials

Explore all guides →
9 min read•finance

How to Use a Compound Interest Calculator: A Practical Guide

Learn how compound interest accelerates long-term wealth accumulation, how compounding frequencies impact returns, and how to use Burnjet’s visual calculator.

Read Tutorial

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