Compound Interest Calculator
Calculate how your money grows over time with compound interest.
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Calculate how your money grows over time with compound interest.
See exactly how your investments will grow over 5, 10, 20, or 30 years with detailed year-by-year projections.
Test different scenarios by adjusting the interest rate, compounding frequency, and contribution amounts.
The calculator shows how starting early, even with smaller amounts, outperforms larger investments made later.
Use realistic return rates to estimate how much you need to save monthly to reach your retirement goals.
Add monthly contributions to see the combined effect of savings discipline and compound growth.
Compound interest is often called the eighth wonder of the world because of its extraordinary ability to multiply wealth over time. Understanding how it works is fundamental to making smart financial decisions, whether you are saving for retirement, paying off a mortgage, or simply growing an emergency fund.
The key insight about compound interest is that time matters more than the amount you invest. A 25-year-old who invests $200 per month at 7% annual return will have more at age 65 than a 35-year-old who invests $400 per month at the same rate.
Compound interest also works in reverse with debt. Credit card balances and loans use compound interest, meaning unpaid interest generates even more interest. Understanding this helps you prioritize paying off high-interest debt.
A 7% nominal return with 3% inflation means only about 4% real growth. Always consider inflation when projecting long-term returns.
Investment returns are often subject to capital gains tax. A 10% gross return might be only 7-8% after taxes.
Markets fluctuate. While historical averages show 7-10% returns, individual years vary wildly.
A 1% annual management fee can reduce your final balance by 20-30% over 30 years.
Every year you wait costs an entire year of compounding. Even small amounts invested early outperform large amounts invested late.
Compound interest is interest calculated on both the initial principal and the accumulated interest from previous periods. Unlike simple interest, which is only calculated on the principal, compound interest allows your money to grow exponentially over time. The formula is A = P(1 + r/n)^(nt).
Interest can be compounded annually, semi-annually, quarterly, monthly, or daily. The more frequently interest is compounded, the faster your money grows. Monthly compounding is common for savings accounts.
The Rule of 72 is a quick way to estimate how long it will take for an investment to double. Divide 72 by the annual interest rate. At 8% annual return, your money doubles in approximately 9 years.
Simple interest is calculated only on the original principal. Compound interest is calculated on the principal plus previously earned interest. Over long periods, compound interest generates significantly more returns.
Four main factors: principal amount, interest rate, compounding frequency, and time period. Time has the most dramatic effect due to exponential growth.
Yes, with debt. Credit card balances accrue compound interest on unpaid balances. A $5,000 debt at 20% APR compounded monthly grows to over $8,000 in three years without payments.
Aviso sobre informacion financiera
Los calculos y la informacion proporcionados son orientativos y no constituyen asesoramiento financiero. Los resultados reales pueden variar segun las condiciones del mercado y las entidades financieras. Consulta con un asesor financiero cualificado antes de tomar decisiones economicas importantes.