Calculate future value with yearly, quarterly, monthly or daily compounding plus regular contributions.
What is the Compound Interest Calculator?
Compound interest is interest earned on both your money and the interest it already earned – which is why long-term saving grows so fast. This compound interest calculator shows how a starting amount plus regular monthly deposits can grow over the years with yearly, quarterly, monthly or daily compounding.
A year-by-year table shows your total deposits, the interest earned and your balance, so you can see the snowball effect clearly.
How to use the Compound Interest Calculator
- Enter your starting amount and monthly deposit.
- Enter the expected annual return and the number of years.
- Choose how often interest compounds and read the future value.
Compound interest formula
A = P (1 + r/n)n·t, where P is the starting amount, r the annual rate, n the number of compounding periods per year and t the number of years. Monthly deposits are added and compounded each month.
Example: 100,000 plus 5,000 per month at 10% for 10 years grows to about 1.29 million – you deposit 700,000 and earn around 590,000 in interest.
The Rule of 72
Divide 72 by the annual return to estimate how many years it takes to double your money. At 8% it takes about 9 years; at 12% about 6 years.
Tips for growing savings
- Start early – time matters more than the amount.
- Increase your monthly deposit when your income rises.
- Watch fees and inflation, which reduce your real return.
Frequently asked questions
What is the difference between simple and compound interest?
Simple interest is paid only on the original amount; compound interest also earns on previous interest.
Are the returns guaranteed?
No. Use a realistic rate – investment returns go up and down.
Which compounding is best?
More frequent compounding gives slightly more, but the rate and time invested matter far more.
Is this financial advice?
No. It is an educational estimate – consult a licensed advisor for decisions.
This compound interest calculator is 100% free, needs no signup and works on phones, tablets and computers. Your data is processed in your browser and never uploaded.
Last updated: · By NodifyTech